* The primary enhancement beyond the RFC description is an optional
* device component. Instead of treating the device as just another segment
* in the path, it can be stored as a separate component (almost a
* sub-authority), with the root below it. For example, resolving
* /bar against file:///c:/foo would result in
* file:///c:/bar being returned. Also, you cannot take
* the parent of a device, so resolving .. against
* file:///c:/ would not yield file:///, as you
* might expect. This feature is useful when working with file-scheme
* URIs, as devices do not typically occur in protocol-based ones. A
* device-enabled URI is created by parsing a string with
* {@link #createURI(String) createURI}; if the first segment of the path
* ends with the : character, it is stored (including the colon)
* as the device, instead. Alternately, either the {@link
* #createHierarchicalURI(String, String, String, String, String) no-path}
* or the {@link #createHierarchicalURI(String, String, String, String[],
* String, String) absolute-path} form of createHierarchicalURI()
* can be used, in which a non-null device parameter can be
* specified.
*
*
* The other enhancement provides support for the almost-hierarchical
* form used for files within archives, such as the JAR scheme, defined
* for the Java Platform in the documentation for {@link
* java.net.JarURLConnection}. By default, this support is enabled for
* absolute URIs with scheme equal to "jar", "zip", or "archive" (ignoring case), and
* is implemented by a hierarchical URI, whose authority includes the
* entire URI of the archive, up to and including the !
* character. The URI of the archive must have no fragment. The whole
* archive URI must have no device and an absolute path. Special handling
* is supported for {@link #createURI(String) creating}, {@link
* #validArchiveAuthority validating}, {@link #devicePath getting the path}
* from, and {@link #toString() displaying} archive URIs. In all other
* operations, including {@link #resolve(URI) resolving} and {@link
* #deresolve(URI) deresolving}, they are handled like any ordinary URI.
* The schemes that identify archive URIs can be changed from their default
* by setting the org.eclipse.emf.common.util.URI.archiveSchemes
* system property. Multiple schemes should be space separated, and the test
* of whether a URI's scheme matches is always case-insensitive.
*
* This implementation does not impose all of the restrictions on
* character validity that are specified in the RFC. Static methods whose
* names begin with "valid" are used to test whether a given string is valid
* value for the various URI components. Presently, these tests place no
* restrictions beyond what would have been required in order for {@link
* #createURI(String) createURI} to have parsed them correctly from a single
* URI string. If necessary in the future, these tests may be made more
* strict, to better conform to the RFC.
*
*
Another group of static methods, whose names begin with "encode", use
* percent escaping to encode any characters that are not permitted in the
* various URI components. Another static method is provided to {@link
* #decode decode} encoded strings. An escaped character is represented as
* a percent symbol (%), followed by two hex digits that specify
* the character code. These encoding methods are more strict than the
* validation methods described above. They ensure validity according to the
* RFC, with one exception: non-ASCII characters.
*
*
The RFC allows only characters that can be mapped to 7-bit US-ASCII
* representations. Non-ASCII, single-byte characters can be used only via
* percent escaping, as described above. This implementation uses Java's
* Unicode char and String representations, and
* makes no attempt to encode characters 0xA0 and above. Characters in the
* range 0x80-0x9F are still escaped. In this respect, EMF's notion of a URI
* is actually more like an IRI (Internationalized Resource Identifier), for
* which an RFC is now in draft
* form
.
*
*
Finally, note the difference between a null parameter to
* the static factory methods and an empty string. The former signifies the
* absence of a given URI component, while the latter simply makes the
* component blank. This can have a significant effect when resolving. For
* example, consider the following two URIs: /bar (with no
* authority) and ///bar (with a blank authority). Imagine
* resolving them against a base with an authority, such as
* http://www.eclipse.org/. The former case will yield
* http://www.eclipse.org/bar, as the base authority will be
* preserved. In the latter case, the empty authority will override the
* base authority, resulting in http:///bar!
*/
public abstract class URI
{
protected static final boolean DEBUG = false;
/**
* The cached hash code of the URI.
* This is always equal to the hash code of {@link #toString()}
*/
protected int hashCode;
/**
* A pool for caching URIs.
*/
protected static class URIPool extends Pool
{
protected static final long serialVersionUID = 1L;
/**
* A reference queue for managing the {@link URI#toString} values.
*/
protected final ReferenceQueue cachedToStrings;
public URIPool(ReferenceQueue queue)
{
super(1031, null, queue);
// The string cache will be managed by either an internal or external cache as appropriate.
//
cachedToStrings = externalQueue == null ? new ReferenceQueue() : null;
}
/**
* A based access unit for this pool.
*/
protected static class URIPoolAccessUnitBase extends AccessUnit
{
/**
* A local access unit for exclusive use in {@link #intern(char[], int, int)}.
*/
protected CommonUtil.StringPool.CharactersAccessUnit charactersAccessUnit = new CommonUtil.StringPool.CharactersAccessUnit(null);
/**
* A local access unit for exclusive for normalizing the scheme in {@link #intern(String)}, {@link #intern(boolean, String)}, and {@link StringAccessUnit#parseIntoURI(String)}.
*/
protected CommonUtil.StringPool.StringAccessUnit stringAccessUnit = new CommonUtil.StringPool.StringAccessUnit(CommonUtil.STRING_POOL, null);
/**
* The string pool entry found during the most recent use of {@link #substringAccessUnit}.
*/
protected CommonUtil.StringPool.StringPoolEntry stringPoolEntry;
/**
* A local access unit for exclusive use in {@link #intern(String, int, int)} and {@link #intern(String, int, int, int)}.
* It {@link #stringPoolEntry} the string pool entry that was matched when {@link CommonUtil.StringPool.SubstringAccessUnit#reset(boolean)} is called.
*/
protected CommonUtil.StringPool.SubstringAccessUnit substringAccessUnit =
new CommonUtil.StringPool.SubstringAccessUnit(null)
{
@Override
public void reset(boolean isExclusive)
{
stringPoolEntry = (CommonUtil.StringPool.StringPoolEntry)getEntry();
super.reset(isExclusive);
}
};
/**
* An access unit for exclusive use in {@link #internArray(String[], int, int, int)}.
*/
protected SegmentSequence.StringArrayPool.SegmentsAndSegmentCountAccessUnit stringArraySegmentsAndSegmentCountAccessUnit = new SegmentSequence.StringArrayPool.SegmentsAndSegmentCountAccessUnit(null);
protected URIPoolAccessUnitBase(Pool.AccessUnit.Queue queue)
{
super(queue);
}
@Override
protected URI getValue()
{
throw new UnsupportedOperationException();
}
@Override
protected void setValue(URI value)
{
throw new UnsupportedOperationException();
}
@Override
protected boolean setArbitraryValue(Object value)
{
throw new UnsupportedOperationException();
}
protected String intern(String string)
{
stringAccessUnit.setValue(string);
return CommonUtil.STRING_POOL.doIntern(false, stringAccessUnit);
}
protected String intern(boolean toLowerCase, String string)
{
stringAccessUnit.setValue(toLowerCase, string);
return CommonUtil.STRING_POOL.doIntern(false, stringAccessUnit);
}
protected String intern(String string, int offset, int count, int hashCode)
{
substringAccessUnit.setValue(string, offset, count, hashCode);
return CommonUtil.STRING_POOL.doIntern(false, substringAccessUnit);
}
protected String intern(String string, int offset, int count)
{
substringAccessUnit.setValue(string, offset, count);
return CommonUtil.STRING_POOL.doIntern(false, substringAccessUnit);
}
protected String intern(char[] characters, int offset, int count)
{
charactersAccessUnit.setValue(characters, offset, count);
return CommonUtil.STRING_POOL.doIntern(false, charactersAccessUnit);
}
protected String intern(char[] characters, int offset, int count, int hashCode)
{
charactersAccessUnit.setValue(characters, offset, count, hashCode);
return CommonUtil.STRING_POOL.doIntern(false, charactersAccessUnit);
}
protected String[] internArray(String[] segments, int offset, int segmentCount, int hashCode)
{
stringArraySegmentsAndSegmentCountAccessUnit.setValue(segments, offset, segmentCount, hashCode);
return SegmentSequence.STRING_ARRAY_POOL.doIntern(false, stringArraySegmentsAndSegmentCountAccessUnit);
}
@Override
public void reset(boolean isExclusive)
{
stringPoolEntry = null;
super.reset(isExclusive);
}
}
/**
* Access units for basic string access.
*/
protected final StringAccessUnit.Queue stringAccessUnits = new StringAccessUnit.Queue(this);
/**
* An access unit for basic string access.
*/
protected static class StringAccessUnit extends URIPoolAccessUnitBase
{
protected static class Queue extends AccessUnit.Queue
{
private static final long serialVersionUID = 1L;
final protected URIPool pool;
public Queue(URIPool pool)
{
this.pool = pool;
}
@Override
public StringAccessUnit pop(boolean isExclusive)
{
return (StringAccessUnit)super.pop(isExclusive);
}
@Override
protected AccessUnit newAccessUnit()
{
return new StringAccessUnit(this, pool);
}
}
/**
* This unit's pool.
*/
protected final URIPool pool;
/**
* The value being accessed.
*/
protected String value;
/**
* The cached hash code computed by {@link #findMajorSeparator(int, String, int)} and {@link #findSegmentEnd(int, String, int)}.
*/
protected int findHashCode;
/**
* The cached terminating character computed by {@link #findMajorSeparator(int, String, int)} and {@link #findSegmentEnd(int, String, int)}.
*/
protected char findTerminatingCharacter;
/**
* An access unit for exclusive use in {@link #internArray(String, int, int, int)}.
*/
protected SegmentSequence.StringArrayPool.SubstringAccessUnit stringArraySubstringAccessUnit = new SegmentSequence.StringArrayPool.SubstringAccessUnit(null);
/**
* An access unit for exclusive use in {@link #internArray(int, String[], int, String, int, int, int)}.
*/
protected SegmentSequence.StringArrayPool.SegmentsAndSubsegmentAccessUnit stringArraySegmentsAndSubsegmentAccessUnit = new SegmentSequence.StringArrayPool.SegmentsAndSubsegmentAccessUnit(null);
protected String[] internArray(String segment, int offset, int count, int hashCode)
{
stringArraySubstringAccessUnit.setValue(segment, offset, count, hashCode);
return SegmentSequence.STRING_ARRAY_POOL.doIntern(false, stringArraySubstringAccessUnit);
}
protected String[] internArray(int hashCode, String[] segments, int segmentCount, String segment, int offset, int count, int segmentHashCode)
{
if (segmentCount == 0)
{
return internArray(segment, offset, count, segmentHashCode);
}
else
{
stringArraySegmentsAndSubsegmentAccessUnit.setValue(hashCode, segments, segmentCount, segment, offset, count, segmentHashCode);
return SegmentSequence.STRING_ARRAY_POOL.doIntern(false, stringArraySegmentsAndSubsegmentAccessUnit);
}
}
/**
* Creates an instance managed by this queue and pool.
*/
protected StringAccessUnit(Queue queue, URIPool pool)
{
super(queue);
this.pool = pool;
}
/**
* Caches the parameters.
*/
protected void setValue(String value)
{
this.value = value;
this.hashCode = value.hashCode();
}
/**
* Caches the parameters.
*/
protected void setValue(String value, int hashCode)
{
this.value = value;
this.hashCode = hashCode;
}
@Override
protected boolean matches(URI value)
{
return value.matches(this.value);
}
@Override
public URI match()
{
// If we fail to match, use getInternalizedValue to parse and cache an instance.
//
URI result = super.match();
return result == null ? getInternalizedValue() : result;
}
@Override
public URI getInternalizedValue()
{
return parseIntoURI(value);
}
/**
* A string-parsing implementation.
* This method creates instances in the pool as a side-effect.
* Note that we never pass in a string with a fragment separator to this method.
*/
protected URI parseIntoURI(String uri)
{
// The initial values for what we'll compute.
//
boolean hasExpectedHashCode = true;
boolean isSchemeNormal = true;
String scheme = null;
String authority = null;
String device = null;
boolean absolutePath = false;
String[] segments = NO_SEGMENTS;
int segmentsHashCode = 1;
String query = null;
boolean isArchiveScheme = false;
boolean isPlatformScheme = false;
// Look for the major separator, i.e., one of ":/?"
//
int length = uri.length();
int i = 0;
int j = findMajorSeparator(length, uri, i);
// If we've found the scheme separator...
//
if (findTerminatingCharacter == SCHEME_SEPARATOR)
{
// Look if the scheme's hash code matches one of the most likely schemes we expect to find...
//
int findHashCode = this.findHashCode;
if (findHashCode == SCHEME_PLATFORM_HASH_CODE)
{
scheme = SCHEME_PLATFORM;
isPlatformScheme = true;
}
else if (findHashCode == SCHEME_FILE_HASH_CODE)
{
scheme = SCHEME_FILE;
}
else if (findHashCode == SCHEME_HTTP_HASH_CODE)
{
scheme = SCHEME_HTTP;
}
else if (findHashCode == SCHEME_JAR_HASH_CODE)
{
scheme = SCHEME_JAR;
isArchiveScheme = true;
}
else if (findHashCode == SCHEME_ARCHIVE_HASH_CODE)
{
scheme = SCHEME_ARCHIVE;
isArchiveScheme = true;
}
else if (findHashCode == SCHEME_ZIP_HASH_CODE)
{
scheme = SCHEME_ZIP;
isArchiveScheme = true;
}
// If it isn't one of the expected schemes, or it is, then we need to make sure it's really equal to what's in the URI, not an accidential hash code collision...
//
if (scheme == null || !scheme.regionMatches(0, uri, 0, j))
{
// Intern the provided version of the scheme.
//
String unnormalizedScheme = intern(uri, 0, j, findHashCode);
// Intern the lower case version of the scheme.
//
stringAccessUnit.setValue(true, unnormalizedScheme);
stringAccessUnit.add(unnormalizedScheme, stringPoolEntry);
scheme = stringAccessUnit.match();
stringAccessUnit.reset(false);
// Determine if the provided version is in normal form, i.e., already lower cased.
//
isSchemeNormal = unnormalizedScheme == scheme;
// Check whether it's a different hash code; we'll need to compute the right hash code if we've lower cased the scheme.
//
hasExpectedHashCode = scheme.hashCode() == findHashCode;
// Check if it's an archive scheme...
//
for (String archiveScheme : ARCHIVE_SCHEMES)
{
if (scheme == archiveScheme)
{
isArchiveScheme = true;
break;
}
}
isPlatformScheme = scheme == SCHEME_PLATFORM;
}
// Look for the end of the following segment.
//
i = j + 1;
j = findSegmentEnd(length, uri, i);
}
if (isArchiveScheme)
{
// Look for the archive separator, which must be present.
//
j = uri.lastIndexOf(ARCHIVE_SEPARATOR);
if (j == -1)
{
throw new IllegalArgumentException("no archive separator");
}
// In that case it's an absolute path and the authority is everything up to and including the ! of the archive separator.
//
absolutePath = true;
authority = intern(uri, i, ++j - i);
// Look for the end of the following segment starting after the / in the archive separator.
//
i = j + 1;
j = findSegmentEnd(length, uri, i);
}
else if (i == j && findTerminatingCharacter == SEGMENT_SEPARATOR)
{
// If we're starting with a / so it's definitely hierarchical.
// Look for the next segment end, and if we find a / as the next character...
//
j = findSegmentEnd(length, uri, ++i);
if (j == i && findTerminatingCharacter == SEGMENT_SEPARATOR)
{
// Look for the segment that follows; it's the authority, even if it's empty.
//
j = findSegmentEnd(length, uri, ++i);
authority = intern(uri, i, j - i, findHashCode);
i = j;
// If the authority is followed by a /...
//
if (findTerminatingCharacter == SEGMENT_SEPARATOR)
{
// Then it's an absolute path so look for the end of the following segment.
//
absolutePath = true;
j = findSegmentEnd(length, uri, ++i);
}
}
else
{
// Because it started with a /, the current segment, which we'll capcture below, is the start of an absolute path.
//
absolutePath = true;
}
}
else if (scheme != null)
{
// There's a scheme, but it's not followed immediately by a /, so it's an opaque URI.
//
authority = intern(uri, i, length - i);
URI resultURI = pool.intern(false, URIPool.URIComponentsAccessUnit.VALIDATE_NONE, false, scheme, authority, null, false, null, null);
// If something tries to add an entry for this access unit, we'd better be sure that the hash code is that of the transformed URI.
//
this.hashCode = resultURI.hashCode();
return resultURI;
}
// Start analyzing the first segment...
//
boolean segmentsRemain = false;
int start = i;
int len = j - i;
i = j;
if (len == 0)
{
// If we found a /, then we have one single empty segment so far.
//
if (findTerminatingCharacter != QUERY_SEPARATOR)
{
segments = ONE_EMPTY_SEGMENT;
segmentsHashCode = 31;
// Look for the next segment. There is one even if it's empty.
//
j = findSegmentEnd(length, uri, ++i);
segmentsRemain = true;
}
}
// If this first segment ends with a : and we're not processing an archive URI, then treat it as the device...
//
else if (!isArchiveScheme && !isPlatformScheme && uri.charAt(j - 1) == DEVICE_IDENTIFIER)
{
device = intern(uri, start, len, findHashCode);
// If the device is at the end of the URI...
//
if (findTerminatingCharacter == QUERY_SEPARATOR)
{
// Then there's no absolute path and no segments remain.
//
absolutePath = false;
}
else
{
// Look for the segment that follows.
//
j = findSegmentEnd(length, uri, ++i);
// If it's empty, then we ignore it because the empty segment is implicit from this being an absolute path.
// Or, if there is another /, then we have another segment to process.
//
segmentsRemain = i != j || findTerminatingCharacter == SEGMENT_SEPARATOR;
}
}
else
{
// Append the segment...
//
segments = internArray(uri, start, j - start, findHashCode);
segmentsHashCode = 31 * segmentsHashCode + findHashCode;
// If we're not already at the end...
//
if (findTerminatingCharacter != QUERY_SEPARATOR)
{
// Find the end of the following segment, and indicate that we should process it.
//
j = findSegmentEnd(length, uri, ++i);
segmentsRemain = true;
}
}
// If we have more segments to process...
//
if (segmentsRemain)
{
for (;;)
{
// Append that segment...
//
segments = internArray(segmentsHashCode, segments, segments.length, uri, i, j - i, findHashCode);
segmentsHashCode = 31 * segmentsHashCode + findHashCode;
i = j;
// If the current segment is terminated by a /...
//
if (findTerminatingCharacter == SEGMENT_SEPARATOR)
{
// Find the end of the following segment.
//
j = findSegmentEnd(length, uri, ++i);
}
else
{
// Otherwise, we're done.
//
break;
}
}
}
// If we're not yet past the end of the string, what remains must be the query string.
//
if (i++ < length) // implies uri.charAt(i) == QUERY_SEPARATOR
{
// Intern what's left to the end of the string.
//
query = intern(uri, i, length - i);
}
// If we're sure we have the right hash code (the scheme was not lower cased), we can use it, otherwise, we must compute a hash code.
//
URI resultURI;
if (hasExpectedHashCode)
{
resultURI = pool.intern(true, true, scheme, authority, device, absolutePath, segments, query, hashCode);
}
else
{
resultURI = pool.intern(true, URIPool.URIComponentsAccessUnit.VALIDATE_NONE, true, scheme, authority, device, absolutePath, segments, query);
// If something tries to add an entry for this access unit, we'd better be sure that the hash code is that of the transformed URI.
//
this.hashCode = resultURI.hashCode();
}
if (isSchemeNormal)
{
resultURI.cacheString(uri);
}
return resultURI;
}
/**
* Looks for a '/', ':', or '?', computing the {@link #findHashCode hash code} and {@link #findTerminatingCharacter setting the character} that terminated the scan.
*/
protected int findMajorSeparator(int length, String s, int i)
{
findTerminatingCharacter = QUERY_SEPARATOR;
int hashCode = 0;
for (; i < length; i++)
{
char c = s.charAt(i);
if (c == SEGMENT_SEPARATOR || c == SCHEME_SEPARATOR || c == QUERY_SEPARATOR)
{
findTerminatingCharacter = c;
break;
}
hashCode = 31 * hashCode + c;
}
findHashCode = hashCode;
return i;
}
/**
* Looks for a '/', or '?', computing the {@link #findHashCode hash code} and {@link #findTerminatingCharacter setting the character} that terminated the scan.
*/
protected int findSegmentEnd(int length, String s, int i)
{
findTerminatingCharacter = QUERY_SEPARATOR;
int hashCode = 0;
for (; i < length; i++)
{
char c = s.charAt(i);
if (c == SEGMENT_SEPARATOR || c == QUERY_SEPARATOR)
{
findTerminatingCharacter = c;
break;
}
hashCode = 31 * hashCode + c;
}
findHashCode = hashCode;
return i;
}
@Override
public void reset(boolean isExclusive)
{
value = null;
super.reset(isExclusive);
}
}
/**
* Access units for platform URI string-based access.
*/
protected final PlatformAccessUnit.Queue platformAccessUnits = new PlatformAccessUnit.Queue();
/**
* An access units for platform URI string-based access.
*/
protected static class PlatformAccessUnit extends URIPoolAccessUnitBase
{
protected static class Queue extends AccessUnit.Queue
{
private static final long serialVersionUID = 1L;
@Override
public PlatformAccessUnit pop(boolean isExclusive)
{
return (PlatformAccessUnit)super.pop(isExclusive);
}
@Override
protected AccessUnit newAccessUnit()
{
return new PlatformAccessUnit(this);
}
}
/**
* The hash code of "platform:/resource/".
*/
protected static final int PLATFORM_RESOURCE_BASE_FULL_HASH_CODE = "platform:/resource/".hashCode();
/**
* The hash code of "platform:/plugin/".
*/
protected static final int PLATFORM_PLUGIN_BASE_FULL_HASH_CODE = "platform:/plugin/".hashCode();
/**
* The hash code of "platform:/resource".
*/
protected static final int PLATFORM_RESOURCE_BASE_INITIAL_HASH_CODE = "platform:/resource".hashCode();
/**
* The hash code of "platform:/plugin/".
*/
protected static final int PLATFORM_PLUGIN_BASE_INITIAL_HASH_CODE = "platform:/plugin".hashCode();
/**
* The base that implicitly precedes the {@link #path}.
*/
protected String base;
/**
* The path being accessed.
*/
protected String path;
/**
* Whether the pathName needs encoding.
*/
protected boolean encode;
/**
* A buffer uses for processing the path.
*/
protected char[] characters = new char[100];
/**
* The accumulated segments pulled from the path.
*/
protected String[] segments = new String[20];
/**
* The number of {@link #segments}.
*/
protected int segmentCount;
/**
* The boundaries of the path segments.
*/
protected int[] segmentBoundaries = new int[100];
/**
* The hash code of the path segments.
*/
protected int[] segmentHashCodes = new int[100];
/**
* The path after it's been encoded.
*/
protected String encodedPath;
/**
* Creates and instance managed by the given queue.
*/
protected PlatformAccessUnit(Queue queue)
{
super(queue);
}
/**
* Caches the parameters and computes the hash code, which can involve encoding the path.
*/
protected void setValue(String base, String path, boolean encode)
{
this.base = base;
this.path = path;
this.encode = encode;
int length = path.length();
if (length == 0)
{
encodedPath = "/";
segmentBoundaries[segmentCount] = 0;
segmentBoundaries[segmentCount++] = 1;
this.hashCode = base == SEGMENT_RESOURCE ? PLATFORM_RESOURCE_BASE_FULL_HASH_CODE : PLATFORM_PLUGIN_BASE_FULL_HASH_CODE;
}
else
{
// At most each character could need encoding and that would triple the length.
// Even when not encoding, we still check for the ? and # and encode those.
//
int maxEncodedLength = 3 * length;
if (characters.length <= maxEncodedLength)
{
// Leave room for one more character, i.e., the leading / that may need to be added.
//
characters = new char[maxEncodedLength + 1];
}
// There can be at most as many segments as characters.
//
if (segmentBoundaries.length < length)
{
segmentBoundaries = new int[length];
segmentHashCodes = new int[length];
}
// Keep track of whether any characters were encoded.
//
boolean isModified = false;
// Treat this character the same as a /. In fact, on non-Wwindows systems this will be a / anyway.
//
char separatorchar = File.separatorChar;
char character = path.charAt(0);
if (character == SEGMENT_SEPARATOR)
{
// If the path starts with a /, copy over all the characters into the buffer.
//
path.getChars(0, length, characters, 0);
}
else if (character == separatorchar)
{
// If the path starts with a \, put a / at the start and copy over all the characters except the first into the buffer.
//
characters[0] = SEGMENT_SEPARATOR;
if (length != 1)
{
path.getChars(1, length, characters, 1);
}
// Indicate that we've modified the original path.
//
isModified = true;
}
else
{
// It doesn't start with a separator character so put a / at the start and copy all the characters into the buffer after that.
//
characters[0] = SEGMENT_SEPARATOR;
path.getChars(0, length, characters, 1);
// The string is now one character longer and we've modified the path.
//
++length;
isModified = true;
}
// The first character in the buffer is a /, so that's the initial hash code.
//
int hashCode = SEGMENT_SEPARATOR;
int segmentHashCode = 0;
// Iterate over all the characters...
//
for (int i = 1; i < length; ++i)
{
// If the character is one that needs encoding, including the path separators or special characters.
//
character = characters[i];
if (encode ? character < 160 && !URI.matches(character, SEGMENT_CHAR_HI, SEGMENT_CHAR_LO) : URI.matches(character, PLATFORM_SEGMENT_RESERVED_HI, PLATFORM_SEGMENT_RESERVED_LO))
{
if (character == SEGMENT_SEPARATOR)
{
// If it's a /, cache the segment hash code, and boundary, reset the segment hash code, and compose the complete hash code.
//
segmentHashCodes[segmentCount] = segmentHashCode;
segmentBoundaries[segmentCount++] = i;
segmentHashCode = 0;
hashCode = 31 * hashCode + SEGMENT_SEPARATOR;
}
else if (character == separatorchar)
{
// If it's a \, convert it to a /, cache the segment hash code, and boundary, reset the segment hash code, and compose the complete hash code, and indicate we've modified the original path.
//
characters[i] = SEGMENT_SEPARATOR;
segmentHashCodes[segmentCount] = segmentHashCode;
segmentBoundaries[segmentCount++] = i;
segmentHashCode = 0;
hashCode = 31 * hashCode + SEGMENT_SEPARATOR;
isModified = true;
}
else
{
// Escape the character.
//
isModified = true;
// Shift the buffer to the right 3 characters.
//
System.arraycopy(characters, i + 1, characters, i + 3, length - i - 1);
// Add a % and compose the segment hashCode and the complete hash code.
//
characters[i] = ESCAPE;
hashCode = 31 * hashCode + ESCAPE;
segmentHashCode = 31 * segmentHashCode + ESCAPE;
// Add the first hex digit and compose the segment hashCode and the complete hash code.
//
char firstHexCharacter = characters[++i] = HEX_DIGITS[(character >> 4) & 0x0F];
hashCode = 31 * hashCode + firstHexCharacter;
segmentHashCode = 31 * segmentHashCode + firstHexCharacter;
// Add the second hex digit and compose the segment hashCode and the complete hash code.
//
char secondHexCharacter = characters[++i] = HEX_DIGITS[character & 0x0F];
hashCode = 31 * hashCode + secondHexCharacter;
segmentHashCode = 31 * segmentHashCode + secondHexCharacter;
// The length is two characters bigger than before.
//
length += 2;
}
}
else
{
// No encoding required, so just compose the segment hash code and the complete hash code.
//
hashCode = 31 * hashCode + character;
segmentHashCode = 31 * segmentHashCode + character;
}
}
// Set cache the final segment's hash code and boundary.
//
segmentHashCodes[segmentCount] = segmentHashCode;
segmentBoundaries[segmentCount++] = length;
// Compose the overall hash code to include the base's hash code.
//
this.hashCode = (base == SEGMENT_RESOURCE ? PLATFORM_RESOURCE_BASE_INITIAL_HASH_CODE : PLATFORM_PLUGIN_BASE_INITIAL_HASH_CODE) * CommonUtil.powerOf31(length) + hashCode;
encodedPath = isModified ? intern(characters, 0, length, hashCode) : path;
}
}
@Override
protected boolean matches(URI value)
{
return value.matches(base, encodedPath);
}
@Override
public URI getInternalizedValue()
{
// Ensure that there are enough segments to hold the results.
//
if (segments.length <= segmentCount)
{
segments = new String[segmentCount + 1];
}
// Start with the given base segment.
//
segments[0] = base;
// Compute the hash code of the segments array.
// The offset is the start of the segment within the character's buffer, which is initially at index 1, i.e., after the leading /.
//
int hashCode = 31 + base.hashCode();
for (int i = 0, offset = 1, segmentCount = this.segmentCount; i < segmentCount; )
{
// Get the segment's hash code.
//
int segmentHashCode = segmentHashCodes[i];
// Get the terminating boundary for this segment.
//
int end = segmentBoundaries[i++];
// The number of characters in the segment.
//
int count = end - offset;
// Intern that character range with the known segment hash code.
//
segments[i] = intern(characters, offset, count, segmentHashCode);
// Compose the segment's hash code.
//
hashCode = 31 * hashCode + segmentHashCode;
// Set the offset to be one character after the terminating /.
offset = end + 1;
}
// Create a hierarchical platform-scheme URI from the interned segments.
//
return new Hierarchical(this.hashCode, true, SCHEME_PLATFORM, null, null, true, internArray(segments, 0, segmentCount + 1, hashCode), null);
}
@Override
public void reset(boolean isExclusive)
{
for (int i = 1; i <= segmentCount; ++i)
{
segments[i] = null;
}
segmentCount = 0;
encodedPath = null;
path = null;
super.reset(isExclusive);
}
}
/**
* Access units for file URI string-based access.
*/
protected final FileAccessUnit.Queue fileAccessUnits = new FileAccessUnit.Queue();
/**
* An Access unit for file URI string-based access.
*/
protected static class FileAccessUnit extends URIPoolAccessUnitBase
{
protected static class Queue extends AccessUnit.Queue
{
private static final long serialVersionUID = 1L;
@Override
public FileAccessUnit pop(boolean isExclusive)
{
return (FileAccessUnit)super.pop(isExclusive);
}
@Override
protected AccessUnit newAccessUnit()
{
return new FileAccessUnit(this);
}
}
/**
* The base URI for file scheme URIs.
*/
protected static final String FILE_BASE = "file:/";
/**
* The length of the base URI for file scheme URIs.
*/
protected static final int FILE_BASE_LENGTH = "file:/".length();
/**
* The hash code of the base URI for file scheme URIs.
*/
protected static final int FILE_BASE_HASH_CODE = FILE_BASE.hashCode();
/**
* The file path being accessed.
*/
protected String path;
/**
* The buffer for absolute file paths.
*/
protected char[] absoluteCharacters = new char[100];
/**
* The buffer for relative file paths.
*/
protected char[] relativeCharacters = new char[100];
/**
* The segments of the path.
*/
protected String[] segments = new String[20];
/**
* The number of segments in the path.
*/
protected int segmentCount;
/**
* The boundaries of the segments in the path.
*/
protected int[] segmentBoundaries = new int[100];
/**
* The hash codes of the segments in the path.
*/
protected int[] segmentHashCodes = new int[100];
/**
* The final encoded path.
*/
protected String encodedPath;
/**
* Whether the file path represents an absolute file.
*/
protected boolean isAbsoluteFile;
/**
* Whether the path itself is absolute.
*/
protected boolean isAbsolutePath;
/**
* Creates an instance managed by the given queue.
*/
public FileAccessUnit(Queue queue)
{
super(queue);
// Caches the base absolute file path characters.
//
FILE_BASE.getChars(0, FILE_BASE_LENGTH, absoluteCharacters, 0);
}
/**
* Caches the parameter and computes the hash code.
*/
protected void setValue(String path)
{
this.path = path;
int length = path.length();
if (length == 0)
{
// It's just the empty string with the zero hash code.
//
encodedPath = "";
this.hashCode = 0;
}
else
{
// Is this path considered an absolute file by the file system implementation?
//
isAbsoluteFile = new File(path).isAbsolute();
// This will use either the absoluteCharacters or the relativeCharacters...
//
char[] characters;
// Check the first character.
//
char character = path.charAt(0);
// We're convert this character to a /.
//
char separatorchar = File.separatorChar;
// Compose the hash code.
//
int hashCode;
// Walk the path segments...
//
int i;
// There can be at most as many boundaries as characters.
//
if (segmentBoundaries.length < length)
{
segmentBoundaries = new int[length];
segmentHashCodes = new int[length];
}
if (isAbsoluteFile)
{
// If it's an absolute file then it must be an absolute path.
//
isAbsolutePath = true;
// There can be at most as many encoded characters as three times the length, plus we need to account for the characters in the base.
//
int maxEncodedLength = 3 * length + FILE_BASE_LENGTH;
if (absoluteCharacters.length <= maxEncodedLength)
{
// Allocate one slightly larger and copy in the base path.
//
absoluteCharacters = new char[maxEncodedLength + 1];
FILE_BASE.getChars(0, FILE_BASE_LENGTH, absoluteCharacters, 0);
}
// Process the absolute characters.
//
characters = absoluteCharacters;
if (character == SEGMENT_SEPARATOR || character == separatorchar)
{
// If the path starts with a separator, copy over the characters after that / to the buffer after the base.
//
path.getChars(1, length, characters, FILE_BASE_LENGTH);
// The length is larger by one less than the base.
//
length += FILE_BASE_LENGTH - 1;
}
else
{
// If the path doesn't start with a /, copy over all the characters into the buffer after the base.
//
path.getChars(0, length, characters, FILE_BASE_LENGTH);
// The length is larger by the base.
//
length += FILE_BASE_LENGTH;
}
// The first boundary is after the base and that's where we start processing the characters.
//
segmentBoundaries[0] = i = FILE_BASE_LENGTH;
// The hash code so far is the base's hash code.
//
hashCode = FILE_BASE_HASH_CODE;
}
else
{
// There can be at most as many encoded characters as three times the length.
//
int maxEncodedLength = 3 * length;
if (relativeCharacters.length <= maxEncodedLength)
{
// Allocate one slightly larger.
//
relativeCharacters = new char[maxEncodedLength + 1];
}
// Process the relative characters.
//
characters = relativeCharacters;
if (character == SEGMENT_SEPARATOR || character == separatorchar)
{
// If the path starts with a separator, then it's an absolute path.
//
isAbsolutePath = true;
// Set the leading / and copy over the characters after the leading / or \ to the buffer after that.
//
characters[0] = SEGMENT_SEPARATOR;
path.getChars(1, length, characters, 1);
// The first boundary is after the / and that's where we start processing the characters.
//
segmentBoundaries[0] = i = 1;
// The hash code so far is the /'s hash code.
//
hashCode = SEGMENT_SEPARATOR;
}
else
{
// No leading separator so it's a relative path.
//
isAbsolutePath = false;
// Copy over all the characters in the bufffer.
//
path.getChars(0, length, characters, 0);
// The first boundary is at the start and that's where we start processing the characters.
//
segmentBoundaries[0] = i = 0;
// The hash code so far is zero.
//
hashCode = 0;
}
}
// Compose the segment hash code as we scan the characters.
//
int segmentHashCode = 0;
for (; i < length; ++i)
{
// If the current character needs encoding (including the separator characters) or is the device identifier and we're processing the first segment of an absolute path...
//
character = characters[i];
if (character < 160 && (!URI.matches(character, SEGMENT_CHAR_HI, SEGMENT_CHAR_LO) || character == DEVICE_IDENTIFIER && !isAbsolutePath && segmentCount == 0))
{
if (character == SEGMENT_SEPARATOR)
{
// If it's a /, cache the segment hash code and the segment boundary, reset the segment hash code, and compose the segments hash code.
//
segmentHashCodes[segmentCount] = segmentHashCode;
segmentBoundaries[++segmentCount] = i;
segmentHashCode = 0;
hashCode = 31 * hashCode + SEGMENT_SEPARATOR;
}
else if (character == separatorchar)
{
// If it's a \, change it to a /, cache the segment hash code and the segment boundary, reset the segment hash code, and compose the segments hash code.
//
characters[i] = SEGMENT_SEPARATOR;
segmentHashCodes[segmentCount] = segmentHashCode;
segmentBoundaries[++segmentCount] = i;
segmentHashCode = 0;
hashCode = 31 * hashCode + SEGMENT_SEPARATOR;
}
else
{
// Shift the buffer to the right 3 characters.
//
System.arraycopy(characters, i + 1, characters, i + 3, length - i - 1);
// Add a % and compose the segment hashCode and the complete hash code.
//
characters[i] = ESCAPE;
hashCode = 31 * hashCode + ESCAPE;
segmentHashCode = 31 * segmentHashCode + ESCAPE;
// Add the first hex digit and compose the segment hashCode and the complete hash code.
//
char firstHexCharacter = characters[++i] = HEX_DIGITS[(character >> 4) & 0x0F];
hashCode = 31 * hashCode + firstHexCharacter;
segmentHashCode = 31 * segmentHashCode + firstHexCharacter;
// Add the second hex digit and compose the segment hashCode and the complete hash code.
//
char secondHexCharacter = characters[++i] = HEX_DIGITS[character & 0x0F];
hashCode = 31 * hashCode + secondHexCharacter;
segmentHashCode = 31 * segmentHashCode + secondHexCharacter;
// The length is two characters bigger than before.
//
length += 2;
}
}
else
{
// No encoding required, so just compose the segment hash code and the complete hash code.
//
hashCode = 31 * hashCode + character;
segmentHashCode = 31 * segmentHashCode + character;
}
}
// Set cache the final segment's hash code and boundary.
//
segmentHashCodes[segmentCount] = segmentHashCode;
segmentBoundaries[++segmentCount] = length;
// Compose the overall hash code to include the base's hash code.
//
this.hashCode = hashCode;
// Cache the encoded path.
//
encodedPath = intern(characters, 0, length, hashCode);
}
}
@Override
protected boolean matches(URI value)
{
return value.matches(encodedPath);
}
@Override
public URI getInternalizedValue()
{
// Ensure that we have enough room for all the segments.
//
int segmentCount = this.segmentCount;
if (segments.length <= segmentCount)
{
segments = new String[segmentCount + 1];
}
// Process the appropriate characters.
//
char[] characters = isAbsoluteFile ? absoluteCharacters : relativeCharacters;
// Parse out the device and the authority...
//
String device = null;
String authority = null;
// The initial hash code for the over all final segments.
//
int segmentsHashCode = 1;
// Where we expect the special device segment to appear.
//
int deviceIndex = 0;
// An empty segment at this index will be igored.
//
int ignoredEmptySegmentIndex = -1;
// Whether we ignored an empty segment.
//
boolean ignoredEmptySegment = false;
// Process all the segments...
//
for (int i = 0, segmentIndex = 0, offset = segmentBoundaries[0]; segmentIndex < segmentCount; ++i)
{
// The end of the current segment's boundary.
//
int end = segmentBoundaries[i + 1];
// The number of characters of the current segment.
//
int count = end - offset;
// If this is an empty segment we wish to ignore...
//
if (i == ignoredEmptySegmentIndex && count == 0)
{
// Ignore it and indicate that we ignored a leading empty segment.
//
--segmentCount;
ignoredEmptySegment = true;
}
else
{
// Retrieve the segment's hash code.
//
int segmentHashCode = segmentHashCodes[i];
// Intern the segment characters...
//
String segment = intern(characters, offset, count, segmentHashCode);
// If we're at a device index while processing an absolute file, and we have an empty segment that's not the only segment or the last character of the segment is the device identifier...
//
if (i == deviceIndex && isAbsoluteFile && (count == 0 && segmentCount > 1 || characters[end - 1] == DEVICE_IDENTIFIER))
{
// If the segment has zero length...
//
if (count == 0)
{
// Proceed to the next segment; there must be one because of the guard...
//
offset = end + 1;
segmentHashCode = segmentHashCodes[++i];
end = segmentBoundaries[i + 1];
count = end - offset;
// This segment is really the authority...
//
authority = intern(characters, offset, count, segmentHashCode);
// There are now two fewer segments.
//
segmentCount -= 2;
// We should still check for a device at index 2.
//
deviceIndex = 2;
// We should still consider ignoring an empty segment if it's at index 2.
//
ignoredEmptySegmentIndex = 2;
}
else
{
// Otherwise the segment must end with a :, so it must be the device.
//
device = segment;
// There's one fewer real segment.
//
--segmentCount;
// We should ignore an empty segment if it comes next.
//
ignoredEmptySegmentIndex = deviceIndex + 1;
}
}
else
{
// It's a normal segment so include it and compose the overall segments hash code.
//
segments[segmentIndex++] = segment;
segmentsHashCode = 31 * segmentsHashCode + segmentHashCode;
}
}
// Continue with the characters after the current segment's closing boundary.
//
offset = end + 1;
}
// Intern the segments array itself.
//
String[] internedSegments = internArray(segments, 0, segmentCount, segmentsHashCode);
if (isAbsoluteFile)
{
// If it's absolute, we include the file scheme, and it has an absolute path, if there is one or more segments, or if we ignored an empty segment.
//
return new Hierarchical(this.hashCode, true, SCHEME_FILE, authority, device, segmentCount > 0 || ignoredEmptySegment, internedSegments, null);
}
else
{
// It's a relative URI...
//
return new Hierarchical(this.hashCode, true, null, null, null, isAbsolutePath, internedSegments, null);
}
}
@Override
public void reset(boolean isExclusive)
{
for (int i = 1; i <= segmentCount; ++i)
{
segments[i] = null;
}
segmentCount = 0;
encodedPath = null;
path = null;
super.reset(isExclusive);
}
}
/**
* Access units for component-based access.
*/
protected final URIComponentsAccessUnit.Queue uriComponentsAccessUnits = new URIComponentsAccessUnit.Queue();
/**
* An Access unit for component-based access.
*/
protected static class URIComponentsAccessUnit extends URIPoolAccessUnitBase
{
/**
* A value for {@link #validate} that implies no checking or interning of components is required.
*/
protected static final int VALIDATE_NONE = -1;
/**
* A value for {@link #validate} that implies all components need to be validated.
*/
protected static final int VALIDATE_ALL = -2;
/**
* A value for {@link #validate} that implies only the query componet needs validating.
*/
protected static final int VALIDATE_QUERY = -3;
protected static class Queue extends AccessUnit.Queue
{
private static final long serialVersionUID = 1L;
@Override
public URIComponentsAccessUnit pop(boolean isExclusive)
{
return (URIComponentsAccessUnit)super.pop(isExclusive);
}
@Override
protected AccessUnit newAccessUnit()
{
return new URIComponentsAccessUnit(this);
}
}
/**
* One of the special values {@link #VALIDATE_NONE}, {@link #VALIDATE_ALL}, or {@link #VALIDATE_QUERY}, or the index in the {@link #segments} that need validation.
*/
int validate;
/**
* Whether the components being accesses are for a hierarchical URI
*/
boolean hierarchical;
/**
* The scheme being accessed.
*/
String scheme;
/**
* The authority (or opaque part) being accessed.
*/
String authority;
/**
* The device being accessed.
*/
String device;
/**
* Whether the components being accesses are for an absolute path.
*/
boolean absolutePath;
/**
* The segments being accessed.
*/
String[] segments;
/**
* The query being accessed.
*/
String query;
/**
* An access unit for exclusive use in {@link #internArray(String[], int)}.
*/
SegmentSequence.StringArrayPool.SegmentsAccessUnit stringArraySegmentsAccessUnit = new SegmentSequence.StringArrayPool.SegmentsAccessUnit(null);
/**
* Creates an instance managed by the given queue.
* @param queue
*/
protected URIComponentsAccessUnit(Queue queue)
{
super(queue);
}
protected String[] internArray(String[] segments, int count)
{
if (segments == null)
{
return SegmentSequence.EMPTY_ARRAY;
}
else
{
stringArraySegmentsAccessUnit.setValue(true, true, segments, count);
return SegmentSequence.STRING_ARRAY_POOL.doIntern(false, stringArraySegmentsAccessUnit);
}
}
/**
* Caches the parameters.
*/
protected void setValue(boolean hierarchical, String scheme, String authority, String device, boolean absolutePath, String[] segments, String query, int hashCode)
{
this.validate = VALIDATE_NONE;
this.hierarchical = hierarchical;
this.scheme = scheme;
this.authority = authority;
this.device = device;
this.absolutePath = absolutePath;
this.segments = segments;
this.query = query;
this.hashCode = hashCode;
}
/**
* Caches the parameters and computes the hash code.
*/
protected void setValue(int validate, boolean hierarchical, String scheme, String authority, String device, boolean absolutePath, String[] segments, String query)
{
int hashCode = 0;
if (scheme != null)
{
if (validate == VALIDATE_ALL)
{
scheme = intern(true, scheme);
}
hashCode = scheme.hashCode() * 31 + SCHEME_SEPARATOR;
}
this.validate = validate;
this.hierarchical = hierarchical;
this.scheme = scheme;
this.authority = authority;
this.device = device;
this.absolutePath = absolutePath;
this.segments = segments;
this.query = query;
if (hierarchical)
{
if (segments == null)
{
segments = NO_SEGMENTS;
}
this.segments = segments;
if (authority != null)
{
if (!isArchiveScheme(scheme)) hashCode = hashCode * 961 + AUTHORITY_SEPARATOR_HASH_CODE;
hashCode = hashCode * CommonUtil.powerOf31(authority.length()) + authority.hashCode();
}
if (device != null)
{
hashCode = hashCode * 31 + SEGMENT_SEPARATOR;
hashCode = hashCode * CommonUtil.powerOf31(device.length()) + device.hashCode();
}
if (absolutePath) hashCode = hashCode * 31 + SEGMENT_SEPARATOR;
for (int i = 0, len = segments.length; i < len; i++)
{
if (i != 0) hashCode = hashCode * 31 + SEGMENT_SEPARATOR;
String segment = segments[i];
if (segment == null)
{
throw new IllegalArgumentException("invalid segment: null");
}
hashCode = hashCode * CommonUtil.powerOf31(segment.length()) + segment.hashCode();
}
if (query != null)
{
hashCode = hashCode * 31 + QUERY_SEPARATOR;
hashCode = hashCode * CommonUtil.powerOf31(query.length()) + query.hashCode();
}
}
else
{
hashCode = hashCode * CommonUtil.powerOf31(authority.length()) + authority.hashCode();
}
this.hashCode = hashCode;
}
@Override
protected boolean matches(URI value)
{
return value.matches(validate, hierarchical, scheme, authority, device, absolutePath, segments, query);
}
@Override
public URI getInternalizedValue()
{
if (validate == VALIDATE_ALL)
{
// Validate all the components.
//
validateURI(hierarchical, scheme, authority, device, absolutePath, segments, query, null);
// Intern the components.
//
if (authority != null)
{
authority = intern(authority);
}
if (device != null)
{
device = intern(device);
}
segments = segments == null ? null : internArray(segments, segments.length);
if (query != null)
{
query = intern(query);
}
}
else if (validate == VALIDATE_QUERY)
{
// Validate just the query.
//
if (!validQuery(query))
{
throw new IllegalArgumentException("invalid query portion: " + query);
}
// Intern the just the query.
//
if (query != null)
{
query = intern(query);
}
}
else if (validate != VALIDATE_NONE)
{
// Validate the segments that need validation.
//
for (int i = validate, length = segments.length; i < length; ++i)
{
String segment = segments[i];
if (!validSegment(segment))
{
throw new IllegalArgumentException("invalid segment: " + segment);
}
}
}
// Create the appropriate type of URI.
//
if (hierarchical)
{
return new Hierarchical(hashCode, hierarchical, scheme, authority, device, absolutePath, segments, query);
}
else
{
return new Opaque(hashCode, scheme, authority);
}
}
@Override
public void reset(boolean isExclusive)
{
this.scheme = null;
this.authority = null;
this.device = null;
this.segments = null;
this.query = null;
super.reset(isExclusive);
}
}
/**
* Intern a URI from its string representation, parsing if necessary.
* The string must not contain the fragment separator.
*/
protected URI intern(String string)
{
if (string == null)
{
return null;
}
else
{
// Iterate over the entries with the matching hash code.
//
int hashCode = string.hashCode();
for (Entry entry = getEntry(hashCode); entry != null; entry = entry.getNextEntry())
{
// Check that the referent isn't garbage collected and then compare it.
//
URI uri = entry.get();
if (uri != null && uri.matches(string))
{
// Return that already present value.
//
return uri;
}
}
writeLock.lock();
try
{
StringAccessUnit accessUnit = stringAccessUnits.pop(true);
accessUnit.setValue(string, hashCode);
// The implementation returns an internalized value that's already pooled as a side effect.
//
URI result = accessUnit.getInternalizedValue();
accessUnit.reset(true);
return result;
}
finally
{
writeLock.unlock();
}
}
}
/**
* Intern a platform URI from its path representation, parsing if necessary.
*/
protected URI intern(String base, String pathName, boolean encode)
{
PlatformAccessUnit accessUnit = platformAccessUnits.pop(false);
accessUnit.setValue(base, pathName, encode);
return doIntern(false, accessUnit);
}
/**
* Intern a file URI from its path representation, parsing if necessary.
*/
protected URI internFile(String pathName)
{
FileAccessUnit accessUnit = fileAccessUnits.pop(false);
accessUnit.setValue(pathName);
return doIntern(false, accessUnit);
}
/**
* Intern a URI from its component parts.
* If isExclusive is true, acquire the {@link #writeLock} first.
* Use {@link #intern(boolean, boolean, String, String, String, boolean, String[], String, int)} if the hash code is known and no validation is required.
*/
protected URI intern(boolean isExclusive, int validate, boolean hierarchical, String scheme, String authority, String device, boolean absolutePath, String[] segments, String query)
{
if (isExclusive)
{
writeLock.lock();
}
URI uri;
try
{
URIComponentsAccessUnit accessUnit = uriComponentsAccessUnits.pop(isExclusive);
accessUnit.setValue(validate, hierarchical, scheme, authority, device, absolutePath, segments, query);
uri = doIntern(isExclusive, accessUnit);
}
finally
{
if (isExclusive)
{
writeLock.unlock();
}
}
return uri;
}
/**
* Intern a URI from its component parts.
* If isExclusive is true, acquire the {@link #writeLock} first.
*/
protected URI intern(boolean isExclusive, boolean hierarchical, String scheme, String authority, String device, boolean absolutePath, String[] segments, String query, int hashCode)
{
if (isExclusive)
{
writeLock.lock();
}
URI uri;
try
{
URIComponentsAccessUnit accessUnit = uriComponentsAccessUnits.pop(isExclusive);
accessUnit.setValue(hierarchical, scheme, authority, device, absolutePath, segments, query, hashCode);
uri = doIntern(isExclusive, accessUnit);
}
finally
{
if (isExclusive)
{
writeLock.unlock();
}
}
return uri;
}
/**
* Specialized to manage the {@link #cachedToStrings}.
*/
@Override
protected void doCleanup()
{
super.doCleanup();
for (;;)
{
Reference cachedToString = cachedToStrings.poll();
if (cachedToString == null)
{
return;
}
else
{
cachedToString.clear();
}
}
}
/**
* A specialized weak reference used by {@link URI#toString} that removes the URI's reference when {@link #clear()} is called.
*
*/
protected static class CachedToString extends WeakReference
{
protected final URI uri;
public CachedToString(URI uri, String string, ReferenceQueue queue)
{
super(string, queue);
this.uri = uri;
}
@Override
public void clear()
{
uri.flushCachedString();
super.clear();
}
}
protected WeakReference newCachedToString(URI uri, String string)
{
return
cachedToStrings == null ?
new CachedToString(uri, string, externalQueue) :
new CachedToString(uri, string, cachedToStrings);
}
}
/**
* A pool for managing {@link URI} instances.
*/
protected static final URIPool POOL = new URIPool(CommonUtil.REFERENCE_CLEARING_QUEUE);
// The lower-cased schemes that will be used to identify archive URIs.
protected static final String[] ARCHIVE_SCHEMES;
// Identifies a file-type absolute URI.
protected static final String SCHEME_FILE = "file";
protected static final String SCHEME_JAR = "jar";
protected static final String SCHEME_ZIP = "zip";
protected static final String SCHEME_ARCHIVE = "archive";
protected static final String SCHEME_PLATFORM = "platform";
protected static final String SCHEME_HTTP = "http";
protected static final int SCHEME_FILE_HASH_CODE = SCHEME_FILE.hashCode();
protected static final int SCHEME_JAR_HASH_CODE = SCHEME_JAR.hashCode();
protected static final int SCHEME_ZIP_HASH_CODE = SCHEME_ZIP.hashCode();
protected static final int SCHEME_ARCHIVE_HASH_CODE = SCHEME_ARCHIVE.hashCode();
protected static final int SCHEME_PLATFORM_HASH_CODE = SCHEME_PLATFORM.hashCode();
protected static final int SCHEME_HTTP_HASH_CODE = SCHEME_HTTP.hashCode();
// Special segment values interpreted at resolve and resolve time.
protected static final String SEGMENT_EMPTY = "";
protected static final String SEGMENT_SELF = ".";
protected static final String SEGMENT_PARENT = "..";
// Special segments used for platform URIs.
protected static final String SEGMENT_PLUGIN = "plugin";
protected static final String SEGMENT_RESOURCE = "resource";
// Ensure that all the string constants used as components in URIs are directly in the string pool.
//
static
{
// Ensure that all the string constants are themselves Java interned in the string pool.
//
CommonUtil.STRING_POOL.javaIntern(SCHEME_FILE);
CommonUtil.STRING_POOL.javaIntern(SCHEME_JAR);
CommonUtil.STRING_POOL.javaIntern(SCHEME_ZIP);
CommonUtil.STRING_POOL.javaIntern(SCHEME_ARCHIVE);
CommonUtil.STRING_POOL.javaIntern(SCHEME_PLATFORM);
CommonUtil.STRING_POOL.javaIntern(SCHEME_HTTP);
CommonUtil.STRING_POOL.javaIntern(SEGMENT_EMPTY);
CommonUtil.STRING_POOL.javaIntern(SEGMENT_SELF);
CommonUtil.STRING_POOL.javaIntern(SEGMENT_PARENT);
CommonUtil.STRING_POOL.javaIntern(SEGMENT_PLUGIN);
CommonUtil.STRING_POOL.javaIntern(SEGMENT_RESOURCE);
}
// Special arrays uses for segments
protected static final String[] NO_SEGMENTS = SegmentSequence.EMPTY_ARRAY;
protected static final String[] ONE_EMPTY_SEGMENT = SegmentSequence.EMPTY_STRING_ARRAY;
protected static final String[] ONE_SELF_SEGMENT = SegmentSequence.STRING_ARRAY_POOL.intern(SEGMENT_SELF, false);
// Separators for parsing a URI string.
protected static final char SCHEME_SEPARATOR = ':';
protected static final String AUTHORITY_SEPARATOR = "//";
protected static final int AUTHORITY_SEPARATOR_HASH_CODE = AUTHORITY_SEPARATOR.hashCode();
protected static final char DEVICE_IDENTIFIER = ':';
protected static final char SEGMENT_SEPARATOR = '/';
protected static final char QUERY_SEPARATOR = '?';
protected static final char FRAGMENT_SEPARATOR = '#';
protected static final char USER_INFO_SEPARATOR = '@';
protected static final char PORT_SEPARATOR = ':';
protected static final char FILE_EXTENSION_SEPARATOR = '.';
protected static final char ARCHIVE_IDENTIFIER = '!';
protected static final String ARCHIVE_SEPARATOR = "!/";
// Characters to use in escaping.
protected static final char ESCAPE = '%';
protected static final char[] HEX_DIGITS = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F' };
// Some character classes, as defined in RFC 2396's BNF for URI.
// These are 128-bit bitmasks, stored as two longs, where the Nth bit is set
// iff the ASCII character with value N is included in the set. These are
// created with the highBitmask() and lowBitmask() methods defined below,
// and a character is tested against them using matches().
//
protected static final long ALPHA_HI = highBitmask('a', 'z') | highBitmask('A', 'Z');
protected static final long ALPHA_LO = lowBitmask('a', 'z') | lowBitmask('A', 'Z');
protected static final long DIGIT_HI = highBitmask('0', '9');
protected static final long DIGIT_LO = lowBitmask('0', '9');
protected static final long ALPHANUM_HI = ALPHA_HI | DIGIT_HI;
protected static final long ALPHANUM_LO = ALPHA_LO | DIGIT_LO;
protected static final long HEX_HI = DIGIT_HI | highBitmask('A', 'F') | highBitmask('a', 'f');
protected static final long HEX_LO = DIGIT_LO | lowBitmask('A', 'F') | lowBitmask('a', 'f');
protected static final long UNRESERVED_HI = ALPHANUM_HI | highBitmask("-_.!~*'()");
protected static final long UNRESERVED_LO = ALPHANUM_LO | lowBitmask("-_.!~*'()");
protected static final long RESERVED_HI = highBitmask(";/?:@&=+$,");
protected static final long RESERVED_LO = lowBitmask(";/?:@&=+$,");
protected static final long URIC_HI = RESERVED_HI | UNRESERVED_HI; // | ucschar | escaped
protected static final long URIC_LO = RESERVED_LO | UNRESERVED_LO;
// Additional useful character classes, including characters valid in certain
// URI components and separators used in parsing them out of a string.
//
protected static final long SEGMENT_CHAR_HI = UNRESERVED_HI | highBitmask(";:@&=+$,"); // | ucschar | escaped
protected static final long SEGMENT_CHAR_LO = UNRESERVED_LO | lowBitmask(";:@&=+$,");
protected static final long PATH_CHAR_HI = SEGMENT_CHAR_HI | highBitmask('/'); // | ucschar | escaped
protected static final long PATH_CHAR_LO = SEGMENT_CHAR_LO | lowBitmask('/');
protected static final long MAJOR_SEPARATOR_HI = highBitmask(":/?#");
protected static final long MAJOR_SEPARATOR_LO = lowBitmask(":/?#");
protected static final long SEGMENT_END_HI = highBitmask("/?#");
protected static final long SEGMENT_END_LO = lowBitmask("/?#");
protected static final long PLATFORM_SEGMENT_RESERVED_HI = highBitmask("/?#\\");
protected static final long PLATFORM_SEGMENT_RESERVED_LO = lowBitmask("/?#\\");
// The intent of this was to switch over to encoding platform resource URIs
// by default, but allow people to use a system property to avoid this.
// However, that caused problems for people and we had to go back to not
// encoding and introduce yet another factory method that explicitly enables
// encoding.
//
protected static final boolean ENCODE_PLATFORM_RESOURCE_URIS =
System.getProperty("org.eclipse.emf.common.util.URI.encodePlatformResourceURIs") != null &&
!"false".equalsIgnoreCase(System.getProperty("org.eclipse.emf.common.util.URI.encodePlatformResourceURIs"));
// Static initializer for archiveSchemes.
static
{
// Initialize the archive schemes.
//
List list = new UniqueEList();
String propertyValue = System.getProperty("org.eclipse.emf.common.util.URI.archiveSchemes");
list.add(SCHEME_JAR);
list.add(SCHEME_ZIP);
list.add(SCHEME_ARCHIVE);
if (propertyValue != null)
{
for (StringTokenizer t = new StringTokenizer(propertyValue); t.hasMoreTokens(); )
{
String token = t.nextToken().toLowerCase();
if (validScheme(token))
{
String scheme = CommonUtil.javaIntern(token);
list.add(scheme);
}
}
}
ARCHIVE_SCHEMES = list.toArray(new String[list.size()]);
}
// Returns the lower half bitmask for the given ASCII character.
protected static long lowBitmask(char c)
{
return c < 64 ? 1L << c : 0L;
}
// Returns the upper half bitmask for the given ACSII character.
protected static long highBitmask(char c)
{
return c >= 64 && c < 128 ? 1L << (c - 64) : 0L;
}
// Returns the lower half bitmask for all ASCII characters between the two
// given characters, inclusive.
protected static long lowBitmask(char from, char to)
{
long result = 0L;
if (from < 64 && from <= to)
{
to = to < 64 ? to : 63;
for (char c = from; c <= to; c++)
{
result |= (1L << c);
}
}
return result;
}
// Returns the upper half bitmask for all AsCII characters between the two
// given characters, inclusive.
protected static long highBitmask(char from, char to)
{
return to < 64 ? 0 : lowBitmask((char)(from < 64 ? 0 : from - 64), (char)(to - 64));
}
// Returns the lower half bitmask for all the ASCII characters in the given
// string.
protected static long lowBitmask(String chars)
{
long result = 0L;
for (int i = 0, len = chars.length(); i < len; i++)
{
char c = chars.charAt(i);
if (c < 64) result |= (1L << c);
}
return result;
}
// Returns the upper half bitmask for all the ASCII characters in the given
// string.
protected static long highBitmask(String chars)
{
long result = 0L;
for (int i = 0, len = chars.length(); i < len; i++)
{
char c = chars.charAt(i);
if (c >= 64 && c < 128) result |= (1L << (c - 64));
}
return result;
}
// Returns whether the given character is in the set specified by the given
// bitmask.
protected static boolean matches(char c, long highBitmask, long lowBitmask)
{
if (c >= 128) return false;
return c < 64 ?
((1L << c) & lowBitmask) != 0 :
((1L << (c - 64)) & highBitmask) != 0;
}
// Debugging method: converts the given long to a string of binary digits.
/*
protected static String toBits(long l)
{
StringBuffer result = new StringBuffer();
for (int i = 0; i < 64; i++)
{
boolean b = (l & 1L) != 0;
result.insert(0, b ? '1' : '0');
l >>= 1;
}
return result.toString();
}
*/
/**
* Static factory method for a generic, non-hierarchical URI. There is no
* concept of a relative non-hierarchical URI; such an object cannot be
* created.
*
* @exception java.lang.IllegalArgumentException if scheme is
* null, if scheme is an archive
* URI scheme, or if scheme, opaquePart, or
* fragment is not valid according to {@link #validScheme
* validScheme}, {@link #validOpaquePart validOpaquePart}, or {@link
* #validFragment validFragment}, respectively.
*/
public static URI createGenericURI(String scheme, String opaquePart, String fragment)
{
if (scheme == null)
{
throw new IllegalArgumentException("relative non-hierarchical URI");
}
if (isArchiveScheme(scheme))
{
throw new IllegalArgumentException("non-hierarchical archive URI");
}
return POOL.intern(false, URIPool.URIComponentsAccessUnit.VALIDATE_ALL, false, scheme, opaquePart, null, false, null, null).appendFragment(fragment);
}
/**
* Static factory method for a hierarchical URI with no path. The
* URI will be relative if scheme is non-null, and absolute
* otherwise. An absolute URI with no path requires a non-null
* authority and/or device.
*
* @exception java.lang.IllegalArgumentException if scheme is
* non-null while authority and device are null,
* if scheme is an archive
* URI scheme, or if scheme, authority,
* device, query, or fragment is not
* valid according to {@link #validScheme validSheme}, {@link
* #validAuthority validAuthority}, {@link #validDevice validDevice},
* {@link #validQuery validQuery}, or {@link #validFragment validFragment},
* respectively.
*/
public static URI createHierarchicalURI(String scheme, String authority, String device, String query, String fragment)
{
if (scheme != null && authority == null && device == null)
{
throw new IllegalArgumentException("absolute hierarchical URI without authority, device, path");
}
if (isArchiveScheme(scheme))
{
throw new IllegalArgumentException("archive URI with no path");
}
return POOL.intern(false, URIPool.URIComponentsAccessUnit.VALIDATE_ALL, true, scheme, authority, device, false, NO_SEGMENTS, query).appendFragment(fragment);
}
/**
* Static factory method for a hierarchical URI with absolute path.
* The URI will be relative if scheme is non-null, and
* absolute otherwise.
*
* @param segments an array of non-null strings, each representing one
* segment of the path. As an absolute path, it is automatically
* preceded by a / separator. If desired, a trailing
* separator should be represented by an empty-string segment as the last
* element of the array.
*
* @exception java.lang.IllegalArgumentException if scheme is
* an archive URI scheme and
* device is non-null, or if scheme,
* authority, device, segments,
* query, or fragment is not valid according to
* {@link #validScheme validScheme}, {@link #validAuthority validAuthority}
* or {@link #validArchiveAuthority validArchiveAuthority}, {@link
* #validDevice validDevice}, {@link #validSegments validSegments}, {@link
* #validQuery validQuery}, or {@link #validFragment validFragment}, as
* appropriate.
*/
public static URI createHierarchicalURI(String scheme, String authority, String device, String[] segments, String query, String fragment)
{
if (device != null)
{
if (isArchiveScheme(scheme))
{
throw new IllegalArgumentException("archive URI with device");
}
if (SCHEME_PLATFORM.equals(scheme))
{
throw new IllegalArgumentException("platform URI with device");
}
}
return POOL.intern(false, URIPool.URIComponentsAccessUnit.VALIDATE_ALL, true, scheme, authority, device, true, segments, query).appendFragment(fragment);
}
/**
* Static factory method for a relative hierarchical URI with relative
* path.
*
* @param segments an array of non-null strings, each representing one
* segment of the path. A trailing separator is represented by an
* empty-string segment at the end of the array.
*
* @exception java.lang.IllegalArgumentException if segments,
* query, or fragment is not valid according to
* {@link #validSegments validSegments}, {@link #validQuery validQuery}, or
* {@link #validFragment validFragment}, respectively.
*/
public static URI createHierarchicalURI(String[] segments, String query, String fragment)
{
return POOL.intern(false, URIPool.URIComponentsAccessUnit.VALIDATE_ALL, true, null, null, null, false, segments, query).appendFragment(fragment);
}
/**
* Static factory method based on parsing a URI string, with
* explicit device support and handling
* for archive URIs enabled. The
* specified string is parsed as described in RFC 2396 , and an
* appropriate URI is created and returned. Note that
* validity testing is not as strict as in the RFC; essentially, only
* separator characters are considered. This method also does not perform
* encoding of invalid characters, so it should only be used when the URI
* string is known to have already been encoded, so as to avoid double
* encoding.
*
* @exception java.lang.IllegalArgumentException if any component parsed
* from uri is not valid according to {@link #validScheme
* validScheme}, {@link #validOpaquePart validOpaquePart}, {@link
* #validAuthority validAuthority}, {@link #validArchiveAuthority
* validArchiveAuthority}, {@link #validDevice validDevice}, {@link
* #validSegments validSegments}, {@link #validQuery validQuery}, or {@link
* #validFragment validFragment}, as appropriate.
*/
public static URI createURI(String uri)
{
return createURIWithCache(uri);
}
/**
* Static factory method that encodes and parses the given URI string.
* Appropriate encoding is performed for each component of the URI.
* If more than one # is in the string, the last one is
* assumed to be the fragment's separator, and any others are encoded.
* This method is the simplest way to safely parse an arbitrary URI string.
*
* @param ignoreEscaped true to leave % characters
* unescaped if they already begin a valid three-character escape sequence;
* false to encode all % characters. This
* capability is provided to allow partially encoded URIs to be "fixed",
* while avoiding adding double encoding; however, it is usual just to
* specify false to perform ordinary encoding.
*
* @exception java.lang.IllegalArgumentException if any component parsed
* from uri is not valid according to {@link #validScheme
* validScheme}, {@link #validOpaquePart validOpaquePart}, {@link
* #validAuthority validAuthority}, {@link #validArchiveAuthority
* validArchiveAuthority}, {@link #validDevice validDevice}, {@link
* #validSegments validSegments}, {@link #validQuery validQuery}, or {@link
* #validFragment validFragment}, as appropriate.
*/
public static URI createURI(String uri, boolean ignoreEscaped)
{
return createURIWithCache(encodeURI(uri, ignoreEscaped, FRAGMENT_LAST_SEPARATOR));
}
/**
* When specified as the last argument to {@link #createURI(String, boolean, int)
* createURI}, indicates that there is no fragment, so any # characters
* should be encoded.
* @see #createURI(String, boolean, int)
*/
public static final int FRAGMENT_NONE = 0;
/**
* When specified as the last argument to {@link #createURI(String, boolean, int)
* createURI}, indicates that the first # character should be taken as
* the fragment separator, and any others should be encoded.
* @see #createURI(String, boolean, int)
*/
public static final int FRAGMENT_FIRST_SEPARATOR = 1;
/**
* When specified as the last argument to {@link #createURI(String, boolean, int)
* createURI}, indicates that the last # character should be taken as
* the fragment separator, and any others should be encoded.
* @see #createURI(String, boolean, int)
*/
public static final int FRAGMENT_LAST_SEPARATOR = 2;
/**
* Static factory method that encodes and parses the given URI string.
* Appropriate encoding is performed for each component of the URI.
* Control is provided over which, if any, # should be
* taken as the fragment separator and which should be encoded.
* This method is the preferred way to safely parse an arbitrary URI string
* that is known to contain # characters in the fragment or to
* have no fragment at all.
*
* @param ignoreEscaped true to leave % characters
* unescaped if they already begin a valid three-character escape sequence;
* false to encode all % characters. This
* capability is provided to allow partially encoded URIs to be "fixed",
* while avoiding adding double encoding; however, it is usual just to
* specify false to perform ordinary encoding.
*
* @param fragmentLocationStyle one of {@link #FRAGMENT_NONE},
* {@link #FRAGMENT_FIRST_SEPARATOR}, or {@link #FRAGMENT_LAST_SEPARATOR},
* indicating which, if any, of the # characters should be
* considered the fragment separator. Any others will be encoded.
*
* @exception java.lang.IllegalArgumentException if any component parsed
* from uri is not valid according to {@link #validScheme
* validScheme}, {@link #validOpaquePart validOpaquePart}, {@link
* #validAuthority validAuthority}, {@link #validArchiveAuthority
* validArchiveAuthority}, {@link #validDevice validDevice}, {@link
* #validSegments validSegments}, {@link #validQuery validQuery}, or {@link
* #validFragment validFragment}, as appropriate.
*/
public static URI createURI(String uri, boolean ignoreEscaped, int fragmentLocationStyle)
{
return createURIWithCache(encodeURI(uri, ignoreEscaped, fragmentLocationStyle));
}
/**
* Static factory method based on parsing a URI string, with
* explicit device support enabled.
* Note that validity testing is not a strict as in the RFC; essentially,
* only separator characters are considered. So, for example, non-Latin
* alphabet characters appearing in the scheme would not be considered an
* error.
*
* @exception java.lang.IllegalArgumentException if any component parsed
* from uri is not valid according to {@link #validScheme
* validScheme}, {@link #validOpaquePart validOpaquePart}, {@link
* #validAuthority validAuthority}, {@link #validArchiveAuthority
* validArchiveAuthority}, {@link #validDevice validDevice}, {@link
* #validSegments validSegments}, {@link #validQuery validQuery}, or {@link
* #validFragment validFragment}, as appropriate.
*
* @deprecated Use {@link #createURI(String) createURI}, which now has explicit
* device support enabled. The two methods now operate identically.
*/
@Deprecated
public static URI createDeviceURI(String uri)
{
return createURIWithCache(uri);
}
// Uses the URI pool to speed up creation of a URI from a string.
/**
* This method was included in the public API by mistake.
*
* @deprecated Please use {@link #createURI(String) createURI} instead.
*/
@Deprecated
public static URI createURIWithCache(String uri)
{
int index = uri.indexOf(FRAGMENT_SEPARATOR);
return
index == -1 ?
POOL.intern(uri) :
POOL.intern(uri.substring(0, index)).appendFragment(uri.substring(index + 1));
}
/**
* Static factory method based on parsing a {@link java.io.File} path
* string. The pathName is converted into an appropriate
* form, as follows: platform specific path separators are converted to
* /; the path is encoded; and a "file" scheme and, if missing,
* a leading /, are added to an absolute path. The result
* is then parsed using {@link #createURI(String) createURI}.
*
* The encoding step escapes all spaces, # characters, and
* other characters disallowed in URIs, as well as ?, which
* would delimit a path from a query. Decoding is automatically performed
* by {@link #toFileString toFileString}, and can be applied to the values
* returned by other accessors by via the static {@link #decode(String)
* decode} method.
*
*
A relative path with a specified device (something like
* C:myfile.txt) cannot be expressed as a valid URI.
*
* @exception java.lang.IllegalArgumentException if pathName
* specifies a device and a relative path, or if any component of the path
* is not valid according to {@link #validAuthority validAuthority}, {@link
* #validDevice validDevice}, or {@link #validSegments validSegments},
* {@link #validQuery validQuery}, or {@link #validFragment validFragment}.
*/
public static URI createFileURI(String pathName)
{
return POOL.internFile(pathName);
}
/**
* Static factory method based on parsing a workspace-relative path string.
*
*
The pathName must be of the form:
*
* /project-name/path
*
* Platform-specific path separators will be converted to slashes.
* If not included, the leading path separator will be added. The
* result will be of this form, which is parsed using {@link #createURI(String)
* createURI}:
*
* platform:/resource/project-name/path
*
* This scheme supports relocatable projects in Eclipse and in
* stand-alone EMF.
*
*
Path encoding is performed only if the
* org.eclipse.emf.common.util.URI.encodePlatformResourceURIs
* system property is set to "true". Decoding can be performed with the
* static {@link #decode(String) decode} method.
*
* @exception java.lang.IllegalArgumentException if any component parsed
* from the path is not valid according to {@link #validDevice validDevice},
* {@link #validSegments validSegments}, {@link #validQuery validQuery}, or
* {@link #validFragment validFragment}.
*
* @see org.eclipse.core.runtime.Platform#resolve
* @see #createPlatformResourceURI(String, boolean)
* @deprecated Use {@link #createPlatformResourceURI(String, boolean)} instead.
*/
@Deprecated
public static URI createPlatformResourceURI(String pathName)
{
return createPlatformResourceURI(pathName, ENCODE_PLATFORM_RESOURCE_URIS);
}
/**
* Static factory method based on parsing a workspace-relative path string,
* with an option to encode the created URI.
*
*
The pathName must be of the form:
*
* /project-name/path
*
* Platform-specific path separators will be converted to slashes.
* If not included, the leading path separator will be added. The
* result will be of this form, which is parsed using {@link #createURI(String)
* createURI}:
*
* platform:/resource/project-name/path
*
* This scheme supports relocatable projects in Eclipse and in
* stand-alone EMF.
*
*
Depending on the encode argument, the path may be
* automatically encoded to escape all spaces, # characters,
* and other characters disallowed in URIs, as well as ?,
* which would delimit a path from a query. Decoding can be performed with
* the static {@link #decode(String) decode} method. It is strongly
* recommended to specify true to enable encoding, unless the
* path string has already been encoded.
*
* @exception java.lang.IllegalArgumentException if any component parsed
* from the path is not valid according to {@link #validDevice validDevice},
* {@link #validSegments validSegments}, {@link #validQuery validQuery}, or
* {@link #validFragment validFragment}.
*
* @see org.eclipse.core.runtime.Platform#resolve
*/
public static URI createPlatformResourceURI(String pathName, boolean encode)
{
return POOL.intern(SEGMENT_RESOURCE, pathName, encode);
}
/**
* Static factory method based on parsing a plug-in-based path string,
* with an option to encode the created URI.
*
*
The pathName must be of the form:
*
* /plugin-id/path
*
* Platform-specific path separators will be converted to slashes.
* If not included, the leading path separator will be added. The
* result will be of this form, which is parsed using {@link #createURI(String)
* createURI}:
*
* platform:/plugin/plugin-id/path
*
* This scheme supports relocatable plug-in content in Eclipse.
*
*
Depending on the encode argument, the path may be
* automatically encoded to escape all spaces, # characters,
* and other characters disallowed in URIs, as well as ?,
* which would delimit a path from a query. Decoding can be performed with
* the static {@link #decode(String) decode} method. It is strongly
* recommended to specify true to enable encoding, unless the
* path string has already been encoded.
*
* @exception java.lang.IllegalArgumentException if any component parsed
* from the path is not valid according to {@link #validDevice validDevice},
* {@link #validSegments validSegments}, {@link #validQuery validQuery}, or
* {@link #validFragment validFragment}.
*
* @see org.eclipse.core.runtime.Platform#resolve
* @since org.eclipse.emf.common 2.3
*/
public static URI createPlatformPluginURI(String pathName, boolean encode)
{
return POOL.intern(SEGMENT_PLUGIN, pathName, encode);
}
// Splits the fragment into a segment sequence if it starts with a /, i.e., if it's used as a fragment path by EMF's resource implementation.
//
protected static CharSequence splitInternFragment(String fragment)
{
if (fragment.length() > 0 && fragment.charAt(0) == SEGMENT_SEPARATOR)
{
return SegmentSequence.create("/", fragment);
}
else
{
return CommonUtil.intern(fragment);
}
}
// Protected constructor for use of pool.
//
protected URI(int hashCode)
{
this.hashCode = hashCode;
}
// Validates all of the URI components. Factory methods should call this
// before using the constructor, though they must ensure that the
// inter-component requirements described in their own Javadocs are all
// satisfied, themselves. If a new URI is being constructed out of
// an existing URI, this need not be called. Instead, just the new
// components may be validated individually.
protected static boolean validateURI(boolean hierarchical, String scheme, String authority, String device, boolean absolutePath, String[] segments, String query, String fragment)
{
if (!validScheme(scheme))
{
throw new IllegalArgumentException("invalid scheme: " + scheme);
}
if (!hierarchical)
{
if (!validOpaquePart(authority))
{
throw new IllegalArgumentException("invalid opaquePart: " + authority);
}
}
else
{
if (isArchiveScheme(scheme) ? !validArchiveAuthority(authority) : !validAuthority(authority))
{
throw new IllegalArgumentException("invalid authority: " + authority);
}
if (!validSegments(segments))
{
String s = segments == null ? "invalid segments: null" :
"invalid segment: " + firstInvalidSegment(segments);
throw new IllegalArgumentException(s);
}
}
if (!validDevice(device))
{
throw new IllegalArgumentException("invalid device: " + device);
}
if (!validQuery(query))
{
throw new IllegalArgumentException("invalid query: " + query);
}
if (!validFragment(fragment))
{
throw new IllegalArgumentException("invalid fragment: " + fragment);
}
return true;
}
// Alternate, stricter implementations of the following validation methods
// are provided, commented out, for possible future use...
/**
* Returns true if the specified value would be
* valid as the scheme component of a URI; false otherwise.
*
*
A valid scheme may be null or contain any characters except for the
* following: : / ? #
*/
public static boolean validScheme(String value)
{
return value == null || !contains(value, MAJOR_SEPARATOR_HI, MAJOR_SEPARATOR_LO);
//
A valid scheme may be null, or consist of a single letter followed
// by any number of letters, numbers, and the following characters:
// + - .
//if (value == null) return true;
//return value.length() != 0 &&
// matches(value.charAt(0), ALPHA_HI, ALPHA_LO) &&
// validate(value, SCHEME_CHAR_HI, SCHEME_CHAR_LO, false, false);
}
/**
* Returns true if the specified value would be
* valid as the opaque part component of a URI; false
* otherwise.
*
*
A valid opaque part must be non-null, non-empty, and not contain the
* # character. In addition, its first character must not be
* /
*/
public static boolean validOpaquePart(String value)
{
return value != null && value.indexOf(FRAGMENT_SEPARATOR) == -1 && value.length() > 0 && value.charAt(0) != SEGMENT_SEPARATOR;
//
A valid opaque part must be non-null and non-empty. It may contain
// any allowed URI characters, but its first character may not be
// /
//return value != null && value.length() != 0 &&
// value.charAt(0) != SEGMENT_SEPARATOR &&
// validate(value, URIC_HI, URIC_LO, true, true);
}
/**
* Returns true if the specified value would be
* valid as the authority component of a URI; false otherwise.
*
*
A valid authority may be null or contain any characters except for
* the following: / ? #
*/
public static boolean validAuthority(String value)
{
return value == null || !contains(value, SEGMENT_END_HI, SEGMENT_END_LO);
// A valid authority may be null or contain any allowed URI characters except
// for the following: / ?
//return value == null || validate(value, SEGMENT_CHAR_HI, SEGMENT_CHAR_LO, true, true);
}
/**
* Returns true if the specified value would be
* valid as the authority component of an archive URI ; false
* otherwise.
*
*
To be valid, the authority, itself, must be a URI with no fragment or query,
* followed by the character !.
*/
public static boolean validArchiveAuthority(String value)
{
if (value != null && value.length() > 0 && value.charAt(value.length() - 1) == ARCHIVE_IDENTIFIER)
{
try
{
URI archiveURI = createURI(value.substring(0, value.length() - 1));
return !archiveURI.hasFragment();
}
catch (IllegalArgumentException e)
{
// Ignore the exception and return false.
}
}
return false;
}
/**
* Tests whether the specified value would be valid as the
* authority component of an archive
* URI . This method has been replaced by {@link #validArchiveAuthority
* validArchiveAuthority} since the same form of URI is now supported
* for schemes other than "jar". This now simply calls that method.
*
* @deprecated As of EMF 2.0, replaced by {@link #validArchiveAuthority
* validArchiveAuthority}.
*/
@Deprecated
public static boolean validJarAuthority(String value)
{
return validArchiveAuthority(value);
}
/**
* Returns true if the specified value would be
* valid as the device component of a URI; false otherwise.
*
*
A valid device may be null or non-empty, containing any characters
* except for the following: / ? # In addition, its last
* character must be :
*/
public static boolean validDevice(String value)
{
if (value == null) return true;
int len = value.length();
return len > 0 && value.charAt(len - 1) == DEVICE_IDENTIFIER && !contains(value, SEGMENT_END_HI, SEGMENT_END_LO);
}
/**
* Returns true if the specified value would be
* a valid path segment of a URI; false otherwise.
*
*
A valid path segment must be non-null and not contain any of the
* following characters: / ? #
*/
public static boolean validSegment(String value)
{
return value != null && !contains(value, SEGMENT_END_HI, SEGMENT_END_LO);
//
A valid path segment must be non-null and may contain any allowed URI
// characters except for the following: / ?
//return value != null && validate(value, SEGMENT_CHAR_HI, SEGMENT_CHAR_LO, true, true);
}
/**
* Returns true if the specified value would be
* a valid path segment array of a URI; false otherwise.
*
*
A valid path segment array must be non-null and contain only path
* segments that are valid according to {@link #validSegment validSegment}.
*/
public static boolean validSegments(String[] value)
{
if (value == null) return false;
for (int i = 0, len = value.length; i < len; i++)
{
if (!validSegment(value[i])) return false;
}
return true;
}
// Returns null if the specified value is null or would be a valid path
// segment array of a URI; otherwise, the value of the first invalid
// segment.
protected static String firstInvalidSegment(String[] value)
{
if (value == null) return null;
for (int i = 0, len = value.length; i < len; i++)
{
if (!validSegment(value[i])) return value[i];
}
return null;
}
/**
* Returns true if the specified value would be
* valid as the query component of a URI; false otherwise.
*
*
A valid query may be null or contain any characters except for
* #
*/
public static boolean validQuery(String value)
{
return value == null || value.indexOf(FRAGMENT_SEPARATOR) == -1;
//
A valid query may be null or contain any allowed URI characters.
//return value == null || validate(value, URIC_HI, URIC_LO, true, true);
}
/**
* Returns true if the specified value would be
* valid as the fragment component of a URI; false otherwise.
*
*
A fragment is taken to be unconditionally valid.
*/
public static boolean validFragment(String value)
{
return true;
//
A valid fragment may be null or contain any allowed URI characters.
//return value == null || validate(value, URIC_HI, URIC_LO, true, true);
}
// Searches the specified string for any characters in the set represented
// by the 128-bit bitmask. Returns true if any occur, or false otherwise.
//
protected static boolean contains(String s, long highBitmask, long lowBitmask)
{
for (int i = 0, len = s.length(); i < len; i++)
{
if (matches(s.charAt(i), highBitmask, lowBitmask)) return true;
}
return false;
}
/**
* A subclass for representing a hierarchical URI.
*/
protected static final class Hierarchical extends URI
{
/**
* The {@link #flags} bit for representing {@link URI#hasAbsolutePath()}.
*/
protected static final int HAS_ABSOLUTE_PATH = 1 << 0;
/**
* The {@link #flags} bit for representing {@link URI#hasRelativePath()}.
*/
protected static final int HAS_RELATIVE_PATH = 1 << 1;
/**
* The {@link #flags} bit for representing {@link URI#hasEmptyPath()}.
*/
protected static final int HAS_EMPTY_PATH = 1 << 2;
/**
* The {@link #flags} bit for representing {@link URI#isCurrentDocumentReference()}.
*/
protected static final int IS_CURRENT_DOCUMENT_REFERENCE = 1 << 3;
/**
* The {@link #flags} bit for representing {@link URI#isFile()}.
*/
protected static final int IS_FILE = 1 << 4;
/**
* The {@link #flags} bit for representing {@link URI#isPlatform()}.
*/
protected static final int IS_PLATFORM = 1 << 5;
/**
* The {@link #flags} bit for representing {@link URI#isPlatformResource()}.
*/
protected static final int IS_PLATFORM_RESOURCE = 1 << 6;
/**
* The {@link #flags} bit for representing {@link URI#isPlatformPlugin()}.
*/
protected static final int IS_PLATFORM_PLUGIN = 1 << 7;
/**
* The {@link #flags} bit for representing {@link URI#isArchive()}.
*/
protected static final int IS_ARCHIVE = 1 << 8;
/**
* The {@link #flags} bit for representing {@link URI#hasTrailingPathSeparator()}.
*/
protected static final int HAS_TRAILING_PATH_SEPARATOR = 1 << 9;
/**
* The {@link #flags} bit for representing {@link URI#isPrefix()}.
*/
protected static final int IS_PREFIX = 1 << 10;
/**
* The {@link #flags} bits for representing {@link URI#hasPath()}.
*/
protected static final int HAS_PATH = HAS_ABSOLUTE_PATH | HAS_RELATIVE_PATH;
/**
* Bit flags for the results of all the boolean no-argument methods.
*/
protected final int flags;
/**
* The scheme of the hierarchical URIs.
*/
protected final String scheme; // null -> relative URI reference
/**
* The authority of the hierarchical URI.
*/
protected final String authority;
/**
* The device of the hierarchical URI.
*/
protected final String device;
/**
* The segments of the hierarchical URI.
*/
protected final String[] segments; // empty last segment -> trailing separator
/**
* The query of the hierarchical URI.
*/
protected final String query;
/**
* A weakly cached reference to the string representation.
*/
protected WeakReference toString;
/**
* Creates an instance from the components, computing the {@link #flags} bits.
* Assertions are used to validate the integrity of the result.
* I.e., all components must be interned and the hash code must be equal to the hash code of the {@link #toString()}.
*/
protected Hierarchical(int hashCode, boolean hierarchical, String scheme, String authority, String device, boolean absolutePath, String[] segments, String query)
{
super(hashCode);
int flags = 0;
if (absolutePath)
{
flags |= HAS_ABSOLUTE_PATH;
}
else if (device == null && authority == null)
{
flags |= HAS_RELATIVE_PATH;
if (segments == NO_SEGMENTS)
{
flags |= HAS_EMPTY_PATH;
if (query == null)
{
flags |= IS_CURRENT_DOCUMENT_REFERENCE;
}
}
if (query == null)
{
flags |= IS_FILE;
}
}
if (scheme != null)
{
if (scheme == SCHEME_FILE)
{
flags |= IS_FILE;
}
else if (scheme == SCHEME_PLATFORM)
{
if (authority == null && device == null && segments.length >= 2)
{
flags |= IS_PLATFORM;
String firstSegment = segments[0];
if (firstSegment == SEGMENT_RESOURCE)
{
flags |= IS_PLATFORM_RESOURCE;
}
else if (firstSegment == SEGMENT_PLUGIN)
{
flags |= IS_PLATFORM_PLUGIN;
}
}
}
else
{
for (String archiveScheme : ARCHIVE_SCHEMES)
{
if (scheme == archiveScheme)
{
flags |= IS_ARCHIVE;
break;
}
}
}
}
if (segments == NO_SEGMENTS)
{
if (absolutePath && query == null)
{
flags |= IS_PREFIX;
}
}
else if (segments[segments.length - 1] == SEGMENT_EMPTY)
{
flags |= HAS_TRAILING_PATH_SEPARATOR;
if (query == null)
{
flags |= IS_PREFIX;
}
}
this.flags = flags;
this.scheme = scheme;
this.authority = authority;
this.device = device;
this.segments = segments;
this.query = query;
// The segments array must be interned.
//
assert segments == SegmentSequence.STRING_ARRAY_POOL.intern(true, true, segments, segments.length);
// The scheme must be interned and must be lower cased.
//
assert scheme == CommonUtil.internToLowerCase(scheme);
// The authority must be interned.
//
assert authority == CommonUtil.intern(authority);
// The query must be interned.
//
assert query == CommonUtil.intern(query);
// The device must be interned.
//
assert device == CommonUtil.intern(device);
// The components must be valid.
//
assert validateURI(true, scheme, authority, device, hasAbsolutePath(), segments, query, null);
// The hash code must be the same as that of the string representation
//
assert hashCode == toString().hashCode();
}
@Override
public boolean isRelative()
{
return scheme == null;
}
@Override
protected boolean isBase()
{
return scheme != null;
}
@Override
public boolean isHierarchical()
{
return true;
}
@Override
public boolean hasAuthority()
{
return authority != null;
}
@Override
public boolean hasDevice()
{
return device != null;
}
@Override
public boolean hasPath()
{
// note: (absolutePath || authority == null) -> hierarchical
// (authority == null && device == null && !absolutePath) -> scheme == null
return (flags & HAS_PATH) != 0;
}
@Override
protected boolean hasDeviceOrPath()
{
return (flags & HAS_PATH) != 0 || device != null;
}
@Override
public boolean hasAbsolutePath()
{
// note: absolutePath -> hierarchical
return (flags & HAS_ABSOLUTE_PATH) != 0;
}
@Override
public boolean hasRelativePath()
{
// note: authority == null -> hierarchical
// (authority == null && device == null && !absolutePath) -> scheme == null
return (flags & HAS_RELATIVE_PATH) != 0;
}
@Override
public boolean hasEmptyPath()
{
// note: authority == null -> hierarchical
// (authority == null && device == null && !absolutePath) -> scheme == null
return (flags & HAS_EMPTY_PATH) != 0;
}
@Override
public boolean hasQuery()
{
// note: query != null -> hierarchical
return query != null;
}
@Override
public boolean isCurrentDocumentReference()
{
// note: authority == null -> hierarchical
// (authority == null && device == null && !absolutePath) -> scheme == null
return (flags & IS_CURRENT_DOCUMENT_REFERENCE) != 0;
}
@Override
public boolean isEmpty()
{
// note: authority == null -> hierarchical
// (authority == null && device == null && !absolutePath) -> scheme == null
return (flags & IS_CURRENT_DOCUMENT_REFERENCE) != 0;
}
@Override
public boolean isFile()
{
return (flags & IS_FILE) != 0;
}
@Override
public boolean isPlatform()
{
return (flags & IS_PLATFORM) != 0;
}
@Override
public boolean isPlatformResource()
{
return (flags & IS_PLATFORM_RESOURCE) != 0;
}
@Override
public boolean isPlatformPlugin()
{
return (flags & IS_PLATFORM_PLUGIN) != 0;
}
@Override
public boolean isArchive()
{
return (flags & IS_ARCHIVE) != 0;
}
@Override
protected boolean segmentsEqual(URI uri)
{
String[] segments = this.segments;
int length = segments.length;
if (length != uri.segmentCount()) return false;
for (int i = 0; i < length; i++)
{
if (segments[i] != uri.segment(i)) return false;
}
return true;
}
@Override
public String scheme()
{
return scheme;
}
@Override
public String authority()
{
return authority;
}
@Override
public String userInfo()
{
if (!hasAuthority()) return null;
int i = authority.indexOf(USER_INFO_SEPARATOR);
return i < 0 ? null : authority.substring(0, i);
}
@Override
public String host()
{
if (!hasAuthority()) return null;
int i = authority.indexOf(USER_INFO_SEPARATOR);
int j = authority.indexOf(PORT_SEPARATOR);
return j < 0 ? authority.substring(i + 1) : authority.substring(i + 1, j);
}
@Override
public String port()
{
if (!hasAuthority()) return null;
int i = authority.indexOf(PORT_SEPARATOR);
return i < 0 ? null : authority.substring(i + 1);
}
@Override
public String device()
{
return device;
}
@Override
public String[] segments()
{
return segments.clone();
}
@Override
protected String[] rawSegments()
{
return segments;
}
@Override
public List segmentsList()
{
return Collections.unmodifiableList(Arrays.asList(segments));
}
@Override
public int segmentCount()
{
return segments.length;
}
@Override
public String segment(int i)
{
return segments[i];
}
@Override
public String lastSegment()
{
int len = segments.length;
if (len == 0) return null;
return segments[len - 1];
}
@Override
public String path()
{
if (!hasPath()) return null;
CommonUtil.StringPool.StringsAccessUnit result = CommonUtil.STRING_POOL.getStringBuilder();
if (hasAbsolutePath()) result.append(SEGMENT_SEPARATOR);
String[] segments = this.segments;
for (int i = 0, len = segments.length; i < len; i++)
{
if (i != 0) result.append(SEGMENT_SEPARATOR);
result.append(segments[i]);
}
return CommonUtil.STRING_POOL.intern(result);
}
@Override
public String devicePath()
{
if (!hasPath()) return null;
CommonUtil.StringPool.StringsAccessUnit result = CommonUtil.STRING_POOL.getStringBuilder();
if (hasAuthority())
{
if (!isArchive()) result.append(AUTHORITY_SEPARATOR);
result.append(authority);
if (hasDevice()) result.append(SEGMENT_SEPARATOR);
}
if (hasDevice()) result.append(device);
if (hasAbsolutePath()) result.append(SEGMENT_SEPARATOR);
String[] segments = this.segments;
for (int i = 0, len = segments.length; i < len; i++)
{
if (i != 0) result.append(SEGMENT_SEPARATOR);
result.append(segments[i]);
}
return CommonUtil.STRING_POOL.intern(result);
}
@Override
public String query()
{
return query;
}
@Override
public URI appendQuery(String query)
{
return POOL.intern(false, URIPool.URIComponentsAccessUnit.VALIDATE_QUERY, true, scheme, authority, device, hasAbsolutePath(), segments, query);
}
@Override
public URI trimQuery()
{
if (query == null)
{
return this;
}
else
{
return POOL.intern(false, URIPool.URIComponentsAccessUnit.VALIDATE_NONE, true, scheme, authority, device, hasAbsolutePath(), segments, null);
}
}
@Override
public URI resolve(URI base, boolean preserveRootParents)
{
if (!base.isBase())
{
throw new IllegalArgumentException("resolve against non-hierarchical or relative base");
}
// an absolute URI needs no resolving
if (!isRelative()) return this;
String newAuthority = authority;
String newDevice = device;
boolean newAbsolutePath = hasAbsolutePath();
String[] newSegments = segments;
String newQuery = query;
// note: it's okay for two URIs to share a segments array, since neither will ever modify it
if (authority == null)
{
// no authority: use base's
newAuthority = base.authority();
if (device == null)
{
// no device: use base's
newDevice = base.device();
if (hasEmptyPath() && query == null)
{
// current document reference: use base path and query
newAbsolutePath = base.hasAbsolutePath();
newSegments = base.rawSegments();
newQuery = base.query();
}
else if (hasRelativePath())
{
// relative path: merge with base and keep query.
// note that if the base has no path and this a non-empty relative path, there is an implied root in the resulting path
newAbsolutePath = base.hasAbsolutePath() || !hasEmptyPath();
newSegments = newAbsolutePath ? mergePath(base, preserveRootParents) : NO_SEGMENTS;
}
// else absolute path: keep it and query
}
// else keep device, path, and query
}
// else keep authority, device, path, and query
// Use scheme from base; no validation needed because all components are from existing URIs
return POOL.intern(false, URIPool.URIComponentsAccessUnit.VALIDATE_NONE, true, base.scheme(), newAuthority, newDevice, newAbsolutePath, newSegments, newQuery);
}
// Merges this URI's relative path with the base non-relative path.
// If base has no path, treat it as the root absolute path, unless this has no path either.
//
protected String[] mergePath(URI base, boolean preserveRootParents)
{
if (base.hasRelativePath())
{
throw new IllegalArgumentException("merge against relative path");
}
if (!hasRelativePath())
{
throw new IllegalStateException("merge non-relative path");
}
int baseSegmentCount = base.segmentCount();
int segmentCount = segments.length;
String[] stack = new String[baseSegmentCount + segmentCount];
int sp = 0;
// use a stack to accumulate segments of base, except for the last
// (i.e. skip trailing separator and anything following it), and of relative path
//
for (int i = 0; i < baseSegmentCount - 1; i++)
{
sp = accumulate(stack, sp, base.segment(i), preserveRootParents);
}
for (int i = 0; i < segmentCount; i++)
{
sp = accumulate(stack, sp, segments[i], preserveRootParents);
}
// if the relative path is empty or ends in an empty segment, a parent
// reference, or a self reference, add a trailing separator to a
// non-empty path
if (sp > 0)
{
if (segmentCount == 0)
{
stack[sp++] = SEGMENT_EMPTY;
}
else
{
String segment = segments[segmentCount - 1];
if (segment == SEGMENT_EMPTY || segment == SEGMENT_PARENT || segment == SEGMENT_SELF)
{
stack[sp++] = SEGMENT_EMPTY;
}
}
}
// return a correctly sized result
return SegmentSequence.STRING_ARRAY_POOL.intern(stack, 0, sp);
}
// Adds a segment to a stack, skipping empty segments and self references,
// and interpreting parent references.
protected static int accumulate(String[] stack, int sp, String segment, boolean preserveRootParents)
{
if (SEGMENT_PARENT == segment)
{
if (sp == 0)
{
// special care must be taken for a root's parent reference: it is
// either ignored or the symbolic reference itself is pushed
if (preserveRootParents) stack[sp++] = segment;
}
else
{
// unless we're already accumulating root parent references,
// parent references simply pop the last segment descended
if (SEGMENT_PARENT == stack[sp - 1]) stack[sp++] = segment;
else sp--;
}
}
else if (SEGMENT_EMPTY != segment && SEGMENT_SELF != segment)
{
// skip empty segments and self references; push everything else
stack[sp++] = segment;
}
return sp;
}
@Override
public URI deresolve(URI base, boolean preserveRootParents, boolean anyRelPath, boolean shorterRelPath)
{
if (!base.isBase() || isRelative()) return this;
// note: these assertions imply that neither this nor the base URI has a
// relative path; thus, both have either an absolute path or no path
// different scheme: need complete, absolute URI
if (scheme != base.scheme()) return this;
String newAuthority = authority;
String newDevice = device;
boolean newAbsolutePath = hasAbsolutePath();
String[] newSegments = segments;
String newQuery = query;
if (authority == base.authority() && (hasDeviceOrPath() || !base.hasDeviceOrPath()))
{
// matching authorities and no device or path removal
newAuthority = null;
if (device == base.device())
{
boolean hasPath = hasPath();
boolean baseHasPath = base.hasPath();
if (hasPath || !baseHasPath)
{
// matching devices and no path removal
newDevice = null;
// exception if (!hasPath() && base.hasPath())
if (!anyRelPath && !shorterRelPath)
{
// user rejects a relative path: keep absolute or no path
}
else if (hasPath == baseHasPath && segmentsEqual(base) && query == base.query())
{
// current document reference: keep no path or query
newAbsolutePath = false;
newSegments = NO_SEGMENTS;
newQuery = null;
}
else if (hasPath && !baseHasPath)
{
// no paths: keep query only
newAbsolutePath = false;
newSegments = NO_SEGMENTS;
}
// exception if (!hasAbsolutePath())
else if (hasCollapsableSegments(preserveRootParents))
{
// path form demands an absolute path: keep it and query
}
else
{
// keep query and select relative or absolute path based on length
String[] rel = findRelativePath(base, preserveRootParents);
if (anyRelPath || segments.length > rel.length)
{
// user demands a relative path or the absolute path is longer
newAbsolutePath = false;
newSegments = rel;
}
// else keep shorter absolute path
}
}
}
// else keep device, path, and query
}
// else keep authority, device, path, and query
// always include fragment, even if null;
// no validation needed since all components are from existing URIs
return POOL.intern(false, URIPool.URIComponentsAccessUnit.VALIDATE_NONE, true, null, newAuthority, newDevice, newAbsolutePath, newSegments, newQuery);
}
// Returns true if the non-relative path includes segments that would be
// collapsed when resolving; false otherwise. If preserveRootParents is
// true, collapsible segments include any empty segments, except for the
// last segment, as well as and parent and self references. If
// preserveRootsParents is false, parent references are not collapsible if
// they are the first segment or preceded only by other parent
// references.
protected boolean hasCollapsableSegments(boolean preserveRootParents)
{
if (hasRelativePath())
{
throw new IllegalStateException("test collapsability of relative path");
}
String[] segments = this.segments;
for (int i = 0, len = segments.length; i < len; i++)
{
String segment = segments[i];
if ((i < len - 1 && SEGMENT_EMPTY == segment) ||
SEGMENT_SELF == segment ||
SEGMENT_PARENT == segment && (!preserveRootParents || (i != 0 && SEGMENT_PARENT != segments[i - 1])))
{
return true;
}
}
return false;
}
// Returns the shortest relative path between the the non-relative path of
// the given base and this absolute path. If the base has no path, it is
// treated as the root absolute path.
protected String[] findRelativePath(URI base, boolean preserveRootParents)
{
if (base.hasRelativePath())
{
throw new IllegalArgumentException(
"find relative path against base with relative path");
}
if (!hasAbsolutePath())
{
throw new IllegalArgumentException(
"find relative path of non-absolute path");
}
// treat an empty base path as the root absolute path
String[] startPath = base.collapseSegments(preserveRootParents);
String[] endPath = segments;
// drop last segment from base, as in resolving
int startCount = startPath.length > 0 ? startPath.length - 1 : 0;
int endCount = endPath.length;
// index of first segment that is different between endPath and startPath
int diff = 0;
// if endPath is shorter than startPath, the last segment of endPath may
// not be compared: because startPath has been collapsed and had its
// last segment removed, all preceding segments can be considered non-
// empty and followed by a separator, while the last segment of endPath
// will either be non-empty and not followed by a separator, or just empty
for (int count = startCount < endCount ? startCount : endCount - 1; diff < count && startPath[diff] == endPath[diff]; diff++)
{
// Empty statement.
}
int upCount = startCount - diff;
int downCount = endCount - diff;
// a single separator, possibly preceded by some parent reference
// segments, is redundant
if (downCount == 1 && SEGMENT_EMPTY == endPath[endCount - 1])
{
downCount = 0;
}
// an empty path needs to be replaced by a single "." if there is no
// query, to distinguish it from a current document reference
int length = upCount + downCount;
if (length == 0)
{
if (query == null) return ONE_SELF_SEGMENT;
return NO_SEGMENTS;
}
// return a correctly sized result
String[] result = new String[length];
Arrays.fill(result, 0, upCount, SEGMENT_PARENT);
System.arraycopy(endPath, diff, result, upCount, downCount);
return SegmentSequence.STRING_ARRAY_POOL.intern(false, false, result, length);
}
@Override
protected String[] collapseSegments(boolean preserveRootParents)
{
if (hasRelativePath())
{
throw new IllegalStateException("collapse relative path");
}
if (!hasCollapsableSegments(preserveRootParents)) return rawSegments();
// use a stack to accumulate segments
String[] segments = this.segments;
int segmentCount = segments.length;
String[] stack = new String[segmentCount];
int sp = 0;
for (int i = 0; i < segmentCount; i++)
{
sp = accumulate(stack, sp, segments[i], preserveRootParents);
}
// if the path is non-empty and originally ended in an empty segment, a
// parent reference, or a self reference, add a trailing separator
if (sp > 0)
{
String segment = segments[segmentCount - 1];
if (segment == SEGMENT_EMPTY || segment == SEGMENT_PARENT || segment == SEGMENT_SELF)
{
stack[sp++] = SEGMENT_EMPTY;
}
}
// return a correctly sized result
return SegmentSequence.STRING_ARRAY_POOL.intern(stack, 0, sp);
}
@Override
protected void cacheString(String string)
{
toString = POOL.newCachedToString(this, string);
}
@Override
protected void flushCachedString()
{
toString = null;
}
@Override
protected String getCachedString()
{
WeakReference toString = this.toString;
if (toString != null)
{
String result = toString.get();
if (result == null)
{
toString.clear();
}
else
{
return result;
}
}
return null;
}
@Override
public String toString()
{
String cachedToString = getCachedString();
if (cachedToString != null)
{
return cachedToString;
}
CommonUtil.StringPool.StringsAccessUnit result = CommonUtil.STRING_POOL.getStringBuilder();
if (!isRelative())
{
result.append(scheme);
result.append(SCHEME_SEPARATOR);
}
if (hasAuthority())
{
if (!isArchive()) result.append(AUTHORITY_SEPARATOR);
result.append(authority);
}
if (hasDevice())
{
result.append(SEGMENT_SEPARATOR);
result.append(device);
}
if (hasAbsolutePath()) result.append(SEGMENT_SEPARATOR);
for (int i = 0, len = segments.length; i < len; i++)
{
if (i != 0) result.append(SEGMENT_SEPARATOR);
result.append(segments[i]);
}
if (hasQuery())
{
result.append(QUERY_SEPARATOR);
result.append(query);
}
String string = CommonUtil.STRING_POOL.intern(result);
this.toString = POOL.newCachedToString(this, string);
return string;
}
@Override
protected boolean matches(String string)
{
String cachedString = getCachedString();
if (cachedString != null)
{
return cachedString.equals(string);
}
int length = string.length();
int index = 0;
if (!isRelative())
{
if (!string.startsWith(scheme))
{
return false;
}
index += scheme.length();
if (index >= length || string.charAt(index) != SCHEME_SEPARATOR)
{
return false;
}
++index;
}
if (hasAuthority())
{
if (!isArchive())
{
if (!string.startsWith(AUTHORITY_SEPARATOR, index))
{
return false;
}
index += 2;
}
if (!string.startsWith(authority, index))
{
return false;
}
index += authority.length();
}
if (hasDevice())
{
if (index >= length || string.charAt(index) != SEGMENT_SEPARATOR)
{
return false;
}
++index;
if (!string.startsWith(device, index))
{
return false;
}
index += device.length();
}
if (hasAbsolutePath())
{
if (index >= length || string.charAt(index) != SEGMENT_SEPARATOR)
{
return false;
}
++index;
}
String[] segments = this.segments;
for (int i = 0, len = segments.length; i < len; i++)
{
if (i != 0)
{
if (index >= length || string.charAt(index) != SEGMENT_SEPARATOR)
{
return false;
}
++index;
}
String segment = segments[i];
if (!string.startsWith(segment, index))
{
return false;
}
index += segment.length();
}
if (hasQuery())
{
if (index >= length || string.charAt(index) != QUERY_SEPARATOR)
{
return false;
}
++index;
if (!string.startsWith(query, index))
{
return false;
}
index += query.length();
}
return index == length;
}
@Override
protected boolean matches(int validate, boolean hierarchical, String scheme, String authority, String device, boolean absolutePath, String[] segments, String query)
{
return
hierarchical &&
hasAbsolutePath() == absolutePath &&
(validate >= URIPool.URIComponentsAccessUnit.VALIDATE_NONE ?
this.segments == segments && this.scheme == scheme && this.authority == authority && this.device == device && this.query == query :
Arrays.equals(this.segments, segments) && equals(this.scheme, scheme) && equals(this.authority, authority) && equals(this.device, device) && equals(this.query, query));
}
@Override
protected boolean matches(String base, String path)
{
if (!isPlatform() || segments[0] != base)
{
return false;
}
String[] segments = this.segments;
int length = path.length();
for (int i = 1, len = segments.length, index = 1; i < len; i++)
{
if (i != 1)
{
if (index >= length || path.charAt(index) != SEGMENT_SEPARATOR)
{
return false;
}
++index;
}
String segment = segments[i];
if (!path.startsWith(segment, index))
{
return false;
}
index += segment.length();
}
return true;
}
@Override
public String toFileString()
{
if (!isFile()) return null;
CommonUtil.StringPool.StringsAccessUnit result = CommonUtil.STRING_POOL.getStringBuilder();
char separator = File.separatorChar;
boolean hasDevice = hasDevice();
if (hasAuthority())
{
result.append("//");
result.append(authority);
if (hasDevice) result.append(separator);
}
if (hasDevice) result.append(device);
if (hasAbsolutePath()) result.append(separator);
String[] segments = this.segments;
for (int i = 0, len = segments.length; i < len; i++)
{
if (i != 0) result.append(separator);
result.append(segments[i]);
}
return decode(CommonUtil.STRING_POOL.intern(result));
}
@Override
public String toPlatformString(boolean decode)
{
if (isPlatform())
{
CommonUtil.StringPool.StringsAccessUnit result = CommonUtil.STRING_POOL.getStringBuilder();
String[] segments = this.segments;
for (int i = 1, len = segments.length; i < len; i++)
{
result.append('/');
result.append(decode ? URI.decode(segments[i]) : segments[i]);
}
return CommonUtil.STRING_POOL.intern(result);
}
return null;
}
@Override
public URI appendSegment(String segment)
{
// Do preliminary checking now but full checking later.
//
if (segment == null)
{
throw new IllegalArgumentException("invalid segment: null");
}
// absolute path or no path -> absolute path
boolean newAbsolutePath = !hasRelativePath();
String[] newSegments = SegmentSequence.STRING_ARRAY_POOL.intern(segments, segments.length, segment, true);
return POOL.intern(false, segments.length, true, scheme, authority, device, newAbsolutePath, newSegments, query);
}
@Override
public URI appendSegments(String[] segments)
{
// Do preliminary checking now but full checking later.
//
if (segments == null)
{
throw new IllegalArgumentException("invalid segments: null");
}
else
{
for (String segment : segments)
{
if (segment == null)
{
throw new IllegalArgumentException("invalid segment: null");
}
}
}
// absolute path or no path -> absolute path
boolean newAbsolutePath = !hasRelativePath();
String[] newSegments = SegmentSequence.STRING_ARRAY_POOL.intern(this.segments, segments, true);
return POOL.intern(false, this.segments.length, true, scheme, authority, device, newAbsolutePath, newSegments, query);
}
@Override
public URI trimSegments(int i)
{
if (i < 1) return this;
String[] newSegments;
int len = segments.length - i;
if (len > 0)
{
newSegments = SegmentSequence.STRING_ARRAY_POOL.intern(segments, 0, len);
}
else
{
newSegments = NO_SEGMENTS;
}
return POOL.intern(false, URIPool.URIComponentsAccessUnit.VALIDATE_NONE, true, scheme, authority, device, hasAbsolutePath(), newSegments, query);
}
@Override
public boolean hasTrailingPathSeparator()
{
return (flags & HAS_TRAILING_PATH_SEPARATOR) != 0;
}
@Override
public String fileExtension()
{
int len = segments.length;
if (len == 0) return null;
String lastSegment = segments[len - 1];
int i = lastSegment.lastIndexOf(FILE_EXTENSION_SEPARATOR);
return i < 0 ? null : lastSegment.substring(i + 1);
}
@Override
public URI appendFileExtension(String fileExtension)
{
// Do preliminary checking now and full validation later.
if (fileExtension == null)
{
throw new IllegalArgumentException("invalid segment portion: null");
}
int len = segments.length;
if (len == 0)
{
if (!validSegment(fileExtension))
{
throw new IllegalArgumentException("invalid segment portion: " + fileExtension);
}
return this;
}
String lastSegment = segments[len - 1];
if (SEGMENT_EMPTY == lastSegment)
{
if (!validSegment(fileExtension))
{
throw new IllegalArgumentException("invalid segment portion: " + fileExtension);
}
return this;
}
CommonUtil.StringPool.StringsAccessUnit newLastSegment = CommonUtil.STRING_POOL.getStringBuilder();
newLastSegment.append(lastSegment);
newLastSegment.append(FILE_EXTENSION_SEPARATOR);
newLastSegment.append(fileExtension);
String[] newSegments = SegmentSequence.STRING_ARRAY_POOL.intern(segments, segments.length - 1, CommonUtil.STRING_POOL.intern(newLastSegment), false);
// note: segments.length > 0 -> hierarchical
return POOL.intern(false, len, true, scheme, authority, device, hasAbsolutePath(), newSegments, query);
}
@Override
public URI trimFileExtension()
{
int len = segments.length;
if (len == 0) return this;
String lastSegment = segments[len - 1];
int i = lastSegment.lastIndexOf(FILE_EXTENSION_SEPARATOR);
if (i < 0) return this;
String newLastSegment = lastSegment.substring(0, i);
String[] newSegments = SegmentSequence.STRING_ARRAY_POOL.intern(segments, len - 1, newLastSegment, true);
// note: segments.length > 0 -> hierarchical
return POOL.intern(false, URIPool.URIComponentsAccessUnit.VALIDATE_NONE, true, scheme, authority, device, hasAbsolutePath(), newSegments, query);
}
@Override
public boolean isPrefix()
{
return (flags & IS_PREFIX) != 0;
}
@Override
public URI replacePrefix(URI oldPrefix, URI newPrefix)
{
if (!oldPrefix.isPrefix() || !newPrefix.isPrefix())
{
String which = oldPrefix.isPrefix() ? "new" : "old";
throw new IllegalArgumentException("non-prefix " + which + " value");
}
// Don't even consider it unless this is hierarchical and has scheme,
// authority, device and path absoluteness equal to those of the prefix.
if (scheme != oldPrefix.scheme() || authority != oldPrefix.authority() || device != oldPrefix.device() || hasAbsolutePath() != oldPrefix.hasAbsolutePath())
{
return null;
}
String[] segments = this.segments;
int segmentsLength = segments.length;
// If the prefix has no segments, then it is the root absolute path, and
// we know this is an absolute path, too.
// Get what's left of the segments after trimming the prefix.
String [] oldPrefixSegments = oldPrefix.rawSegments();
int oldPrefixSegmentCount = oldPrefixSegments.length;
int tailSegmentCount;
if (oldPrefixSegmentCount == 0)
{
tailSegmentCount = segmentsLength;
}
else
{
// This must have no fewer segments than the prefix. Since the prefix
// is not the root absolute path, its last segment is empty; all others
// must match.
int i = 0;
int segmentsToCompare = oldPrefixSegmentCount - 1;
if (segmentsLength <= segmentsToCompare) return null;
for (; i < segmentsToCompare; i++)
{
if (segments[i] != oldPrefixSegments[i]) return null;
}
// The prefix really is a prefix of this. If this has just one more,
// empty segment, the paths are the same.
if (i == segmentsLength - 1 && segments[i] == SEGMENT_EMPTY)
{
return newPrefix;
}
else
{
tailSegmentCount = segmentsLength - i;
}
}
// If the new prefix has segments, it is not the root absolute path,
// and we need to drop the trailing empty segment and append the tail
// segments.
String [] newPrefixSegments = newPrefix.rawSegments();
int newPrefixSegmentCount = newPrefixSegments.length;
String[] mergedSegments;
if (newPrefixSegmentCount == 0)
{
mergedSegments = tailSegmentCount == segmentsLength ? segments : SegmentSequence.STRING_ARRAY_POOL.intern(segments, segmentsLength - tailSegmentCount, tailSegmentCount);
}
else
{
mergedSegments = SegmentSequence.STRING_ARRAY_POOL.intern(newPrefixSegments, 0, newPrefixSegmentCount - 1, segments, segmentsLength - tailSegmentCount, tailSegmentCount);
}
// no validation needed since all components are from existing URIs
return POOL.intern(false, URIPool.URIComponentsAccessUnit.VALIDATE_NONE, true, newPrefix.scheme(), newPrefix.authority(), newPrefix.device(), newPrefix.hasAbsolutePath(), mergedSegments, query);
}
}
/**
* A subclass for representing an opaque URI.
*/
protected final static class Opaque extends URI
{
/**
* The scheme of the opaque URI.
*/
protected final String scheme;
/**
* The opaque part of the opaque URI.
*/
protected final String opaquePart;
/**
* A weakly cached reference to the string representation.
*/
protected WeakReference toString;
/**
* Creates an instance from the components.
* Assertions are used to validate the integrity of the result.
* I.e., both components must be interned and the hash code must be equal to the hash code of the {@link #toString()}.
*/
protected Opaque(int hashCode, String scheme, String opaquePart)
{
super(hashCode);
this.scheme = scheme;
this.opaquePart = opaquePart;
// The scheme must be interned and must be lower cased.
//
assert scheme == CommonUtil.internToLowerCase(scheme);
// The authority must be interned.
//
assert opaquePart == CommonUtil.intern(opaquePart);
// The components must be valid.
//
assert validateURI(false, scheme, opaquePart, null, false, NO_SEGMENTS, null, null);
// The hash code must be the same as that of the string representation
//
assert hashCode == toString().hashCode();
}
@Override
public boolean hasOpaquePart()
{
return true;
}
@Override
public String scheme()
{
return scheme;
}
@Override
public String opaquePart()
{
return opaquePart;
}
@Override
protected void cacheString(String string)
{
toString = POOL.newCachedToString(this, string);
}
@Override
protected void flushCachedString()
{
toString = null;
}
@Override
protected String getCachedString()
{
WeakReference toString = this.toString;
if (toString != null)
{
String result = toString.get();
if (result == null)
{
toString.clear();
}
else
{
return result;
}
}
return null;
}
@Override
public String toString()
{
String cachedString = getCachedString();
if (cachedString != null)
{
return cachedString;
}
CommonUtil.StringPool.StringsAccessUnit result = CommonUtil.STRING_POOL.getStringBuilder();
result.append(scheme);
result.append(SCHEME_SEPARATOR);
result.append(opaquePart);
String string = CommonUtil.STRING_POOL.intern(result);
this.toString = POOL.newCachedToString(this, string);
return string;
}
@Override
protected boolean matches(String string)
{
String cachedString = getCachedString();
if (cachedString != null)
{
return cachedString.equals(string);
}
int index = 0;
if (!string.startsWith(scheme))
{
return false;
}
int length = string.length();
index += scheme.length();
if (index >= length || string.charAt(index) != SCHEME_SEPARATOR)
{
return false;
}
++index;
if (!string.startsWith(opaquePart, index))
{
return false;
}
index += opaquePart.length();
return index == length;
}
@Override
protected boolean matches(int validate, boolean hierarchical, String scheme, String authority, String device, boolean absolutePath, String[] segments, String query)
{
return
!hierarchical &&
!absolutePath &&
segments == null &&
query == null &&
(validate >= URIPool.URIComponentsAccessUnit.VALIDATE_NONE ?
this.scheme == scheme && this.opaquePart == authority :
equals(this.scheme, scheme) && equals(this.opaquePart, authority));
}
}
/**
* A subclass for representing a URI with a fragment.
* Most methods simply delegate to the {@link #trimFragment() base} URI.
*/
protected static final class Fragment extends URI
{
/**
* The {@link #trimFragment() base} URI.
*/
protected final URI uri;
/**
* The representation of the fragment.
* The fragment is {@link #splitInternFragment(String) split interned}.
*/
protected CharSequence fragment;
/**
* Creates an instance from the components.
* Assertions are used to validate the integrity of the result.
* I.e., the fragment must be non-null and {@link #splitInternFragment(String) split interned} and the hash code must be equal to the hash code of the {@link #toString()}.
*/
protected Fragment(int hashCode, URI uri, CharSequence fragment)
{
super(hashCode);
this.uri = uri;
this.fragment = fragment;
// There must be a fragment.
//
assert fragment != null;
// The hash code must be the same as that of the string representation,
// unless it's deferred.
//
assert hashCode == 0 || hashCode == toString().hashCode();
}
@Override
public boolean isRelative()
{
return uri.isRelative();
}
@Override
protected boolean isBase()
{
return uri.isBase();
}
@Override
public boolean isHierarchical()
{
return uri.isHierarchical();
}
@Override
public boolean hasAuthority()
{
return uri.hasAuthority();
}
@Override
public boolean hasOpaquePart()
{
return uri.hasOpaquePart();
}
@Override
public boolean hasDevice()
{
return uri.hasDevice();
}
@Override
public boolean hasPath()
{
return uri.hasPath();
}
@Override
protected boolean hasDeviceOrPath()
{
return uri.hasDeviceOrPath();
}
@Override
public boolean hasAbsolutePath()
{
return uri.hasAbsolutePath();
}
@Override
public boolean hasRelativePath()
{
return uri.hasRelativePath();
}
@Override
public boolean hasEmptyPath()
{
return uri.hasEmptyPath();
}
@Override
public boolean hasQuery()
{
return uri.hasQuery();
}
@Override
public boolean hasFragment()
{
return true;
}
@Override
public boolean isCurrentDocumentReference()
{
return uri.isCurrentDocumentReference();
}
@Override
public boolean isEmpty()
{
return false;
}
@Override
public boolean isFile()
{
return uri.isFile();
}
@Override
public boolean isPlatform()
{
return uri.isPlatform();
}
@Override
public boolean isPlatformResource()
{
return uri.isPlatformResource();
}
@Override
public boolean isPlatformPlugin()
{
return uri.isPlatformPlugin();
}
@Override
public boolean isArchive()
{
return uri.isArchive();
}
@Override
protected boolean segmentsEqual(URI uri)
{
return uri.segmentsEqual(uri);
}
@Override
public String scheme()
{
return uri.scheme();
}
@Override
public String opaquePart()
{
return uri.opaquePart();
}
@Override
public String authority()
{
return uri.authority();
}
@Override
public String userInfo()
{
return uri.userInfo();
}
@Override
public String host()
{
return uri.host();
}
@Override
public String port()
{
return uri.port();
}
@Override
public String device()
{
return uri.device();
}
@Override
public String[] segments()
{
return uri.segments();
}
@Override
protected String[] rawSegments()
{
return uri.rawSegments();
}
@Override
public List segmentsList()
{
return uri.segmentsList();
}
@Override
public int segmentCount()
{
return uri.segmentCount();
}
@Override
public String segment(int i)
{
return uri.segment(i);
}
@Override
public String lastSegment()
{
return uri.lastSegment();
}
@Override
public String path()
{
return uri.path();
}
@Override
public String devicePath()
{
return uri.devicePath();
}
@Override
public String query()
{
return uri.query();
}
private URI appendFragment(URI uri)
{
// If the hash code is 0 then it's highly likely we've deferred split interning the fragment, so don't use rawAppendFragment in that case.
//
return hashCode == 0 ? uri.appendFragment(fragment.toString()) : uri.rawAppendFragment(fragment);
}
@Override
public URI appendQuery(String query)
{
return appendFragment(uri.appendQuery(query));
}
@Override
public URI trimQuery()
{
URI result = uri.trimQuery();
return result == uri ? this : appendFragment(result);
}
@Override
public String fragment()
{
if (hashCode == 0)
{
hashCode();
}
return fragment.toString();
}
@Override
public URI appendFragment(String fragment)
{
return uri.appendFragment(fragment);
}
@Override
public URI trimFragment()
{
return uri;
}
@Override
public URI resolve(URI base, boolean preserveRootParents)
{
URI result = uri.resolve(base, preserveRootParents);
return result == uri ? this : appendFragment(result);
}
@Override
public URI deresolve(URI base, boolean preserveRootParents, boolean anyRelPath, boolean shorterRelPath)
{
URI result = uri.deresolve(base, preserveRootParents, anyRelPath, shorterRelPath);
return result == uri ? this : appendFragment(result);
}
@Override
protected String[] collapseSegments(boolean preserveRootParents)
{
return uri.collapseSegments(preserveRootParents);
}
@Override
public String toString()
{
CommonUtil.StringPool.StringsAccessUnit result = CommonUtil.STRING_POOL.getStringBuilder();
result.append(uri.toString());
result.append(FRAGMENT_SEPARATOR);
result.append(fragment);
return CommonUtil.STRING_POOL.intern(result);
}
/**
* If the hash code is 0 then most likely we've got a pending lazy {@link LazyFragmentInitializer}.
*/
@Override
public int hashCode()
{
// Check if we have a deferred hash code initialization pending...
// Note there is the very remote possibility that the hash code could really be 0...
//
if (hashCode == 0)
{
hashCode = ((uri.hashCode * 31) + FRAGMENT_SEPARATOR) * CommonUtil.powerOf31(fragment.length()) + fragment.hashCode();
// In that case, also split intern the fragment, but check if it's really a string, because otherwise it really must be split interned already.
//
if (fragment instanceof String)
{
fragment = splitInternFragment(fragment.toString());
}
}
return hashCode;
}
@Override
public boolean equals(Object object)
{
if (object == this)
{
return true;
}
if (!(object instanceof Fragment))
{
return false;
}
// Be careful to accommodate the case of a deferred split interned fragment.
//
Fragment that = (Fragment)object;
return uri == that.uri && (fragment == that.fragment || fragment.toString().equals(that.fragment().toString()));
}
@Override
public String toFileString()
{
return uri.toFileString();
}
@Override
public String toPlatformString(boolean decode)
{
return uri.toPlatformString(decode);
}
@Override
public URI appendSegment(String segment)
{
URI result = uri.appendSegment(segment);
return result == uri ? this : appendFragment(result);
}
@Override
public URI appendSegments(String[] segments)
{
URI result = uri.appendSegments(segments);
return result == uri ? this : appendFragment(result);
}
@Override
public URI trimSegments(int i)
{
URI result = uri.trimSegments(i);
return result == uri ? this : appendFragment(result);
}
@Override
public boolean hasTrailingPathSeparator()
{
return uri.hasTrailingPathSeparator();
}
@Override
public String fileExtension()
{
return uri.fileExtension();
}
@Override
public URI appendFileExtension(String fileExtension)
{
URI result = uri.appendFileExtension(fileExtension);
return result == uri ? this : appendFragment(result);
}
@Override
public URI trimFileExtension()
{
URI result = uri.trimFileExtension();
return result == uri ? this : result.rawAppendFragment(fragment);
}
@Override
public URI replacePrefix(URI oldPrefix, URI newPrefix)
{
URI result = uri.replacePrefix(oldPrefix, newPrefix);
return result == uri ? this : result == null ? null : appendFragment(result);
}
}
protected void flushCachedString()
{
// Do nothing.
}
protected void cacheString(String string)
{
// Do nothing.
}
protected String getCachedString()
{
return null;
}
/**
* Returns true if this is a relative URI, or
* false if it is an absolute URI.
*/
public boolean isRelative()
{
return false;
}
// Whether this this URI valid has a base URI against which to resolve.
//
protected boolean isBase()
{
return false;
}
/**
* Returns true if this a a hierarchical URI, or
* false if it is of the generic form.
*/
public boolean isHierarchical()
{
return false;
}
/**
* Returns true if this is a hierarchical URI with an authority
* component; false otherwise.
*/
public boolean hasAuthority()
{
return false;
}
/**
* Returns true if this is a non-hierarchical URI with an
* opaque part component; false otherwise.
*/
public boolean hasOpaquePart()
{
// note: hierarchical -> authority != null
return false;
}
/**
* Returns true if this is a hierarchical URI with a device
* component; false otherwise.
*/
public boolean hasDevice()
{
// note: device != null -> hierarchical
return false;
}
protected boolean hasDeviceOrPath()
{
return false;
}
/**
* Returns true if this is a hierarchical URI with an
* absolute or relative path; false otherwise.
*/
public boolean hasPath()
{
// note: (absolutePath || authority == null) -> hierarchical
// (authority == null && device == null && !absolutePath) -> scheme == null
return false;
}
/**
* Returns true if this is a hierarchical URI with an
* absolute path, or false if it is non-hierarchical, has no
* path, or has a relative path.
*/
public boolean hasAbsolutePath()
{
// note: absolutePath -> hierarchical
return false;
}
/**
* Returns true if this is a hierarchical URI with a relative
* path, or false if it is non-hierarchical, has no path, or
* has an absolute path.
*/
public boolean hasRelativePath()
{
// note: authority == null -> hierarchical
// (authority == null && device == null && !absolutePath) -> scheme == null
return false;
}
/**
* Returns true if this is a hierarchical URI with an empty
* relative path; false otherwise.
*
* Note that !hasEmpty() does not imply that this
* URI has any path segments; however, hasRelativePath &&
* !hasEmptyPath() does.
*/
public boolean hasEmptyPath()
{
// note: authority == null -> hierarchical
// (authority == null && device == null && !absolutePath) -> scheme == null
return false;
}
/**
* Returns true if this is a hierarchical URI with a query
* component; false otherwise.
*/
public boolean hasQuery()
{
// note: query != null -> hierarchical
return false;
}
/**
* Returns true if this URI has a fragment component;
* false otherwise.
*/
public boolean hasFragment()
{
return false;
}
/**
* Returns true if this is a current document reference; that
* is, if it is a relative hierarchical URI with no authority, device or
* query components, and no path segments; false is returned
* otherwise.
*/
public boolean isCurrentDocumentReference()
{
// note: authority == null -> hierarchical
// (authority == null && device == null && !absolutePath) -> scheme == null
return false;
}
/**
* Returns true if this is a {@link
* #isCurrentDocumentReference() current document reference} with no
* fragment component; false otherwise.
*
* @see #isCurrentDocumentReference()
*/
public boolean isEmpty()
{
// note: authority == null -> hierarchical
// (authority == null && device == null && !absolutePath) -> scheme == null
return false;
}
/**
* Returns true if this is a hierarchical URI that may refer
* directly to a locally accessible file. This is considered to be the
* case for a file-scheme absolute URI, or for a relative URI with no query;
* false is returned otherwise.
*/
public boolean isFile()
{
return false;
}
/**
* Returns true if this is a platform URI, that is, an absolute,
* hierarchical URI, with "platform" scheme, no authority, and at least two
* segments; false is returned otherwise.
* @since org.eclipse.emf.common 2.3
*/
public boolean isPlatform()
{
return false;
}
/**
* Returns true if this is a platform resource URI, that is,
* a {@link #isPlatform platform URI} whose first segment is "resource";
* false is returned otherwise.
* @see #isPlatform
* @since org.eclipse.emf.common 2.3
*/
public boolean isPlatformResource()
{
return false;
}
/**
* Returns true if this is a platform plug-in URI, that is,
* a {@link #isPlatform platform URI} whose first segment is "plugin";
* false is returned otherwise.
* @see #isPlatform
* @since org.eclipse.emf.common 2.3
*/
public boolean isPlatformPlugin()
{
return false;
}
/**
* Returns true if this is an archive URI. If so, it is also
* hierarchical, with an authority (consisting of an absolute URI followed
* by "!"), no device, and an absolute path.
*/
public boolean isArchive()
{
return false;
}
/**
* Returns true if the specified value would be
* valid as the scheme of an archive URI ; false
* otherwise.
*/
public static boolean isArchiveScheme(String value)
{
// Returns true if the given value is an archive scheme, as defined by
// the org.eclipse.emf.common.util.URI.archiveSchemes system property.
// By default, "jar", "zip", and "archive" are considered archives.
for (String scheme : ARCHIVE_SCHEMES)
{
if (scheme.equals(value))
{
return true;
}
}
return false;
}
/**
* Returns the hash code.
*/
@Override
public int hashCode()
{
return hashCode;
}
// Tests whether this URI's path segment array is equal to that of the given uri.
protected boolean segmentsEqual(URI uri)
{
return false;
}
// Tests two objects for equality, tolerating nulls; null is considered
// to be a valid value that is only equal to itself.
protected static boolean equals(Object o1, Object o2)
{
return o1 == o2 || o1 != null && o1.equals(o2);
}
/**
* If this is an absolute URI, returns the scheme component;
* null otherwise.
*/
public String scheme()
{
return null;
}
/**
* If this is a non-hierarchical URI, returns the opaque part component;
* null otherwise.
*/
public String opaquePart()
{
return null;
}
/**
* If this is a hierarchical URI with an authority component, returns it;
* null otherwise.
*/
public String authority()
{
return null;
}
/**
* If this is a hierarchical URI with an authority component that has a
* user info portion, returns it; null otherwise.
*/
public String userInfo()
{
return null;
}
/**
* If this is a hierarchical URI with an authority component that has a
* host portion, returns it; null otherwise.
*/
public String host()
{
return null;
}
/**
* If this is a hierarchical URI with an authority component that has a
* port portion, returns it; null otherwise.
*/
public String port()
{
return null;
}
/**
* If this is a hierarchical URI with a device component, returns it;
* null otherwise.
*/
public String device()
{
return null;
}
/**
* If this is a hierarchical URI with a path, returns an array containing
* the segments of the path; an empty array otherwise. The leading
* separator in an absolute path is not represented in this array, but a
* trailing separator is represented by an empty-string segment as the
* final element.
*/
public String[] segments()
{
return NO_SEGMENTS;
}
// Directly returns the underlying segments without cloning them.
//
protected String[] rawSegments()
{
return NO_SEGMENTS;
}
/**
* Returns an unmodifiable list containing the same segments as the array
* returned by {@link #segments segments}.
*/
public List segmentsList()
{
return Collections.emptyList();
}
/**
* Returns the number of elements in the segment array that would be
* returned by {@link #segments segments}.
*/
public int segmentCount()
{
return 0;
}
/**
* Provides fast, indexed access to individual segments in the path
* segment array.
*
* @exception java.lang.IndexOutOfBoundsException if i < 0 or
* i >= segmentCount().
*/
public String segment(int i)
{
throw new IndexOutOfBoundsException("No such segment: " + i);
}
/**
* Returns the last segment in the segment array, or null.
*/
public String lastSegment()
{
return null;
}
/**
* If this is a hierarchical URI with a path, returns a string
* representation of the path; null otherwise. The path
* consists of a leading segment separator character (a slash), if the
* path is absolute, followed by the slash-separated path segments. If
* this URI has a separate device
* component , it is not included in the path.
*/
public String path()
{
return null;
}
/**
* If this is a hierarchical URI with a path, returns a string
* representation of the path, including the authority and the
* device component ;
* null otherwise.
*
* If there is no authority, the format of this string is:
*
* device/pathSegment1/pathSegment2...
*
* If there is an authority, it is:
*
* //authority/device/pathSegment1/pathSegment2...
*
* For an archive URI , it's just:
*
* authority/pathSegment1/pathSegment2...
*/
public String devicePath()
{
return null;
}
/**
* If this is a hierarchical URI with a query component, returns it;
* null otherwise.
*/
public String query()
{
return null;
}
/**
* Returns the URI formed from this URI and the given query.
*
* @exception java.lang.IllegalArgumentException if
* query is not a valid query (portion) according
* to {@link #validQuery validQuery}.
*/
public URI appendQuery(String query)
{
if (!validQuery(query))
{
throw new IllegalArgumentException("invalid query portion: " + query);
}
return this;
}
/**
* If this URI has a non-null {@link #query query}, returns the URI
* formed by removing it; this URI unchanged, otherwise.
*/
public URI trimQuery()
{
return this;
}
/**
* If this URI has a fragment component, returns it; null otherwise.
*/
public String fragment()
{
return null;
}
/**
* A weak reference for the external queue that when cleared will
*/
private static class LazyFragmentInitializer extends WeakReference
{
protected final String fragment;
public LazyFragmentInitializer(URI.Fragment uri, ReferenceQueue queue, String fragment)
{
super(uri, queue);
this.fragment = fragment;
enqueue();
}
@Override
public void clear()
{
URI.Fragment uri = get();
if (uri != null)
{
uri.fragment = splitInternFragment(fragment);
uri.hashCode = ((uri.uri.hashCode * 31) + FRAGMENT_SEPARATOR) * CommonUtil.powerOf31(fragment.length()) + uri.fragment.hashCode();
}
}
}
/**
* Returns the URI formed from this URI and the given fragment.
*
* @exception java.lang.IllegalArgumentException if
* fragment is not a valid fragment (portion) according
* to {@link #validFragment validFragment}.
*/
public URI appendFragment(String fragment)
{
if (fragment == null)
{
return this;
}
else
{
if (POOL.externalQueue != null)
{
final Fragment result = new Fragment(0, this, fragment);
new LazyFragmentInitializer(result, POOL.externalQueue, fragment);
return result;
}
else
{
int hashCode = ((this.hashCode * 31) + FRAGMENT_SEPARATOR) * CommonUtil.powerOf31(fragment.length()) + fragment.hashCode();
return new Fragment(hashCode, this, splitInternFragment(fragment));
}
}
}
// Returns the URI formed from this uri and the already properly interned fragment representation.
//
protected URI rawAppendFragment(CharSequence fragment)
{
if (fragment == null)
{
return this;
}
else
{
int hashCode = ((this.hashCode * 31) + FRAGMENT_SEPARATOR) * CommonUtil.powerOf31(fragment.length()) + fragment.hashCode();
return new Fragment(hashCode, this, fragment);
}
}
/**
* If this URI has a non-null {@link #fragment fragment}, returns the URI
* formed by removing it; this URI unchanged, otherwise.
*/
public URI trimFragment()
{
return this;
}
/**
* Resolves this URI reference against a base absolute
* hierarchical URI, returning the resulting absolute URI. If already
* absolute, the URI itself is returned. URI resolution is described in
* detail in section 5.2 of RFC
* 2396 , "Resolving Relative References to Absolute Form."
*
* During resolution, empty segments, self references ("."), and parent
* references ("..") are interpreted, so that they can be removed from the
* path. Step 6(g) gives a choice of how to handle the case where parent
* references point to a path above the root: the offending segments can
* be preserved or discarded. This method preserves them. To have them
* discarded, please use the two-parameter form of {@link
* #resolve(URI, boolean) resolve}.
*
* @exception java.lang.IllegalArgumentException if base is
* non-hierarchical or is relative.
*/
public URI resolve(URI base)
{
return resolve(base, true);
}
/**
* Resolves this URI reference against a base absolute
* hierarchical URI, returning the resulting absolute URI. If already
* absolute, the URI itself is returned. URI resolution is described in
* detail in section 5.2 of RFC
* 2396 , "Resolving Relative References to Absolute Form."
*
*
During resolution, empty segments, self references ("."), and parent
* references ("..") are interpreted, so that they can be removed from the
* path. Step 6(g) gives a choice of how to handle the case where parent
* references point to a path above the root: the offending segments can
* be preserved or discarded. This method can do either.
*
* @param preserveRootParents true if segments referring to the
* parent of the root path are to be preserved; false if they
* are to be discarded.
*
* @exception java.lang.IllegalArgumentException if base is
* non-hierarchical or is relative.
*/
public URI resolve(URI base, boolean preserveRootParents)
{
if (!base.isHierarchical() || base.isRelative())
{
throw new IllegalArgumentException(
"resolve against non-hierarchical or relative base");
}
return this;
}
/**
* Finds the shortest relative or, if necessary, the absolute URI that,
* when resolved against the given base absolute hierarchical
* URI using {@link #resolve(URI) resolve}, will yield this absolute URI.
* If base is non-hierarchical or is relative,
* or this is non-hierarchical or is relative,
* this will be returned.
*/
public URI deresolve(URI base)
{
return deresolve(base, true, false, true);
}
/**
* Finds an absolute URI that, when resolved against the given
* base absolute hierarchical URI using {@link
* #resolve(URI, boolean) resolve}, will yield this absolute URI.
* If base is non-hierarchical or is relative,
* or this is non-hierarchical or is relative,
* this will be returned.
*
* @param preserveRootParents the boolean argument to resolve(URI,
* boolean) for which the returned URI should resolve to this URI.
* @param anyRelPath if true, the returned URI's path (if
* any) will be relative, if possible. If false, the form of
* the result's path will depend upon the next parameter.
* @param shorterRelPath if anyRelPath is false
* and this parameter is true, the returned URI's path (if
* any) will be relative, if one can be found that is no longer (by number
* of segments) than the absolute path. If both anyRelPath
* and this parameter are false, it will be absolute.
*/
public URI deresolve(URI base, boolean preserveRootParents, boolean anyRelPath, boolean shorterRelPath)
{
return this;
}
protected String[] collapseSegments(boolean preserveRootParents)
{
return NO_SEGMENTS;
}
// Returns whether the string representation of the URI fully matches the given string.
//
protected boolean matches(String string)
{
return false;
}
// Used to match a URI against the specified components.
//
protected boolean matches(int validate, boolean hierarchical, String scheme, String authority, String device, boolean absolutePath, String[] segments, String query)
{
return false;
}
// Used to match a platform URI composed from these two components.
//
protected boolean matches(String base, String path)
{
return false;
}
/**
* If this URI may refer directly to a locally accessible file, as
* determined by {@link #isFile isFile}, {@link #decode decodes} and formats
* the URI as a pathname to that file; returns null otherwise.
*
*
If there is no authority, the format of this string is:
*
* device/pathSegment1/pathSegment2...
*
* If there is an authority, it is:
*
* //authority/device/pathSegment1/pathSegment2...
*
* However, the character used as a separator is system-dependent and
* obtained from {@link java.io.File#separatorChar}.
*/
public String toFileString()
{
return null;
}
/**
* If this is a platform URI, as determined by {@link #isPlatform}, returns
* the workspace-relative or plug-in-based path to the resource, optionally
* {@link #decode decoding} the segments in the process.
* @see #createPlatformResourceURI(String, boolean)
* @see #createPlatformPluginURI
* @since org.eclipse.emf.common 2.3
*/
public String toPlatformString(boolean decode)
{
return null;
}
/**
* Returns the URI formed by appending the specified segment on to the end
* of the path of this URI, if hierarchical; this URI unchanged,
* otherwise. If this URI has an authority and/or device, but no path,
* the segment becomes the first under the root in an absolute path.
*
* @exception java.lang.IllegalArgumentException if segment
* is not a valid segment according to {@link #validSegment}.
*/
public URI appendSegment(String segment)
{
if (!validSegment(segment))
{
throw new IllegalArgumentException("invalid segment: " + segment);
}
return this;
}
/**
* Returns the URI formed by appending the specified segments on to the
* end of the path of this URI, if hierarchical; this URI unchanged,
* otherwise. If this URI has an authority and/or device, but no path,
* the segments are made to form an absolute path.
*
* @param segments an array of non-null strings, each representing one
* segment of the path. If desired, a trailing separator should be
* represented by an empty-string segment as the last element of the
* array.
*
* @exception java.lang.IllegalArgumentException if segments
* is not a valid segment array according to {@link #validSegments}.
*/
public URI appendSegments(String[] segments)
{
if (!validSegments(segments))
{
String s = segments == null ? "invalid segments: null" : "invalid segment: " + firstInvalidSegment(segments);
throw new IllegalArgumentException(s);
}
return this;
}
/**
* Returns the URI formed by trimming the specified number of segments
* (including empty segments, such as one representing a trailing
* separator) from the end of the path of this URI, if hierarchical;
* otherwise, this URI is returned unchanged.
*
*
Note that if all segments are trimmed from an absolute path, the
* root absolute path remains.
*
* @param i the number of segments to be trimmed in the returned URI. If
* less than 1, this URI is returned unchanged; if equal to or greater
* than the number of segments in this URI's path, all segments are
* trimmed.
*/
public URI trimSegments(int i)
{
return this;
}
/**
* Returns true if this is a hierarchical URI that has a path
* that ends with a trailing separator; false otherwise.
*
*
A trailing separator is represented as an empty segment as the
* last segment in the path; note that this definition does not
* include the lone separator in the root absolute path.
*/
public boolean hasTrailingPathSeparator()
{
return false;
}
/**
* If this is a hierarchical URI whose path includes a file extension,
* that file extension is returned; null otherwise. We define a file
* extension as any string following the last period (".") in the final
* path segment. If there is no path, the path ends in a trailing
* separator, or the final segment contains no period, then we consider
* there to be no file extension. If the final segment ends in a period,
* then the file extension is an empty string.
*/
public String fileExtension()
{
return null;
}
/**
* Returns the URI formed by appending a period (".") followed by the
* specified file extension to the last path segment of this URI, if it is
* hierarchical with a non-empty path ending in a non-empty segment;
* otherwise, this URI is returned unchanged.
*
The extension is appended regardless of whether the segment already
* contains an extension.
*
* @exception java.lang.IllegalArgumentException if
* fileExtension is not a valid segment (portion) according
* to {@link #validSegment}.
*/
public URI appendFileExtension(String fileExtension)
{
if (!validSegment(fileExtension))
{
throw new IllegalArgumentException("invalid segment portion: " + fileExtension);
}
return this;
}
/**
* If this URI has a non-null {@link #fileExtension fileExtension},
* returns the URI formed by removing it; this URI unchanged, otherwise.
*/
public URI trimFileExtension()
{
return this;
}
/**
* Returns true if this is a hierarchical URI that ends in a
* slash; that is, it has a trailing path separator or is the root
* absolute path, and has no query and no fragment; false
* is returned otherwise.
*/
public boolean isPrefix()
{
return false;
}
/**
* If this is a hierarchical URI reference and oldPrefix is a
* prefix of it, this returns the URI formed by replacing it by
* newPrefix; null otherwise.
*
*
In order to be a prefix, the oldPrefix's
* {@link #isPrefix isPrefix} must return true, and it must
* match this URI's scheme, authority, and device. Also, the paths must
* match, up to prefix's end.
*
* @exception java.lang.IllegalArgumentException if either
* oldPrefix or newPrefix is not a prefix URI
* according to {@link #isPrefix}.
*/
public URI replacePrefix(URI oldPrefix, URI newPrefix)
{
if (!oldPrefix.isPrefix() || !newPrefix.isPrefix())
{
String which = oldPrefix.isPrefix() ? "new" : "old";
throw new IllegalArgumentException("non-prefix " + which + " value");
}
return null;
}
/**
* Encodes a string so as to produce a valid opaque part value, as defined
* by the RFC. All excluded characters, such as space and #,
* are escaped, as is / if it is the first character.
*
* @param ignoreEscaped true to leave % characters
* unescaped if they already begin a valid three-character escape sequence;
* false to encode all % characters. Note that
* if a % is not followed by 2 hex digits, it will always be
* escaped.
*/
public static String encodeOpaquePart(String value, boolean ignoreEscaped)
{
String result = encode(value, URIC_HI, URIC_LO, ignoreEscaped);
return
result != null && result.length() > 0 && result.charAt(0) == SEGMENT_SEPARATOR ? "%2F" + result.substring(1) : result;
}
/**
* Encodes a string so as to produce a valid authority, as defined by the
* RFC. All excluded characters, such as space and #,
* are escaped, as are / and ?
*
* @param ignoreEscaped true to leave % characters
* unescaped if they already begin a valid three-character escape sequence;
* false to encode all % characters. Note that
* if a % is not followed by 2 hex digits, it will always be
* escaped.
*/
public static String encodeAuthority(String value, boolean ignoreEscaped)
{
return encode(value, SEGMENT_CHAR_HI, SEGMENT_CHAR_LO, ignoreEscaped);
}
/**
* Encodes a string so as to produce a valid segment, as defined by the
* RFC. All excluded characters, such as space and #,
* are escaped, as are / and ?
*
* @param ignoreEscaped true to leave % characters
* unescaped if they already begin a valid three-character escape sequence;
* false to encode all % characters. Note that
* if a % is not followed by 2 hex digits, it will always be
* escaped.
*/
public static String encodeSegment(String value, boolean ignoreEscaped)
{
return encode(value, SEGMENT_CHAR_HI, SEGMENT_CHAR_LO, ignoreEscaped);
}
/**
* Encodes a string so as to produce a valid query, as defined by the RFC.
* Only excluded characters, such as space and #, are escaped.
*
* @param ignoreEscaped true to leave % characters
* unescaped if they already begin a valid three-character escape sequence;
* false to encode all % characters. Note that
* if a % is not followed by 2 hex digits, it will always be
* escaped.
*/
public static String encodeQuery(String value, boolean ignoreEscaped)
{
return encode(value, URIC_HI, URIC_LO, ignoreEscaped);
}
/**
* Encodes a string so as to produce a valid fragment, as defined by the
* RFC. Only excluded characters, such as space and #, are
* escaped.
*
* @param ignoreEscaped true to leave % characters
* unescaped if they already begin a valid three-character escape sequence;
* false to encode all % characters. Note that
* if a % is not followed by 2 hex digits, it will always be
* escaped.
*/
public static String encodeFragment(String value, boolean ignoreEscaped)
{
return encode(value, URIC_HI, URIC_LO, ignoreEscaped);
}
// Encodes a complete URI, optionally leaving % characters unescaped when
// beginning a valid three-character escape sequence. We can either treat
// the first or # as a fragment separator, or encode them all.
protected static String encodeURI(String uri, boolean ignoreEscaped, int fragmentLocationStyle)
{
if (uri == null) return null;
StringBuffer result = new StringBuffer();
int i = uri.indexOf(SCHEME_SEPARATOR);
if (i != -1)
{
String scheme = uri.substring(0, i);
result.append(scheme);
result.append(SCHEME_SEPARATOR);
}
int j =
fragmentLocationStyle == FRAGMENT_FIRST_SEPARATOR ?
uri.indexOf(FRAGMENT_SEPARATOR) :
fragmentLocationStyle == FRAGMENT_LAST_SEPARATOR ?
uri.lastIndexOf(FRAGMENT_SEPARATOR) :
-1;
if (j != -1)
{
String sspart = uri.substring(++i, j);
result.append(encode(sspart, URIC_HI, URIC_LO, ignoreEscaped));
result.append(FRAGMENT_SEPARATOR);
String fragment = uri.substring(++j);
result.append(encode(fragment, URIC_HI, URIC_LO, ignoreEscaped));
}
else
{
String sspart = uri.substring(++i);
result.append(encode(sspart, URIC_HI, URIC_LO, ignoreEscaped));
}
return result.toString();
}
// Encodes the given string, replacing each ASCII character that is not in
// the set specified by the 128-bit bitmask and each non-ASCII character
// below 0xA0 by an escape sequence of % followed by two hex digits. If
// % is not in the set but ignoreEscaped is true, then % will not be encoded
// iff it already begins a valid escape sequence.
protected static String encode(String value, long highBitmask, long lowBitmask, boolean ignoreEscaped)
{
if (value == null) return null;
StringBuffer result = null;
for (int i = 0, len = value.length(); i < len; i++)
{
char c = value.charAt(i);
if (!matches(c, highBitmask, lowBitmask) && c < 160 && (!ignoreEscaped || !isEscaped(value, i)))
{
if (result == null)
{
result = new StringBuffer(value.substring(0, i));
}
appendEscaped(result, (byte)c);
}
else if (result != null)
{
result.append(c);
}
}
return result == null ? value : result.toString();
}
// Tests whether an escape occurs in the given string, starting at index i.
// An escape sequence is a % followed by two hex digits.
protected static boolean isEscaped(String s, int i)
{
return s.charAt(i) == ESCAPE && s.length() > i + 2 && matches(s.charAt(i + 1), HEX_HI, HEX_LO) && matches(s.charAt(i + 2), HEX_HI, HEX_LO);
}
// Computes a three-character escape sequence for the byte, appending
// it to the StringBuffer. Only characters up to 0xFF should be escaped;
// all but the least significant byte will be ignored.
protected static void appendEscaped(StringBuffer result, byte b)
{
result.append(ESCAPE);
// The byte is automatically widened into an int, with sign extension,
// for shifting. This can introduce 1's to the left of the byte, which
// must be cleared by masking before looking up the hex digit.
//
result.append(HEX_DIGITS[(b >> 4) & 0x0F]);
result.append(HEX_DIGITS[b & 0x0F]);
}
/**
* Decodes the given string by interpreting three-digit escape sequences as the bytes of a UTF-8 encoded character
* and replacing them with the characters they represent.
* Incomplete escape sequences are ignored and invalid UTF-8 encoded bytes are treated as extended ASCII characters.
*/
public static String decode(String value)
{
if (value == null) return null;
int i = value.indexOf('%');
if (i < 0)
{
return value;
}
else
{
StringBuilder result = new StringBuilder(value.substring(0, i));
byte [] bytes = new byte[4];
int receivedBytes = 0;
int expectedBytes = 0;
for (int len = value.length(); i < len; i++)
{
if (isEscaped(value, i))
{
char character = unescape(value.charAt(i + 1), value.charAt(i + 2));
i += 2;
if (expectedBytes > 0)
{
if ((character & 0xC0) == 0x80)
{
bytes[receivedBytes++] = (byte)character;
}
else
{
expectedBytes = 0;
}
}
else if (character >= 0x80)
{
if ((character & 0xE0) == 0xC0)
{
bytes[receivedBytes++] = (byte)character;
expectedBytes = 2;
}
else if ((character & 0xF0) == 0xE0)
{
bytes[receivedBytes++] = (byte)character;
expectedBytes = 3;
}
else if ((character & 0xF8) == 0xF0)
{
bytes[receivedBytes++] = (byte)character;
expectedBytes = 4;
}
}
if (expectedBytes > 0)
{
if (receivedBytes == expectedBytes)
{
switch (receivedBytes)
{
case 2:
{
result.append((char)((bytes[0] & 0x1F) << 6 | bytes[1] & 0x3F));
break;
}
case 3:
{
result.append((char)((bytes[0] & 0xF) << 12 | (bytes[1] & 0X3F) << 6 | bytes[2] & 0x3F));
break;
}
case 4:
{
result.appendCodePoint(((bytes[0] & 0x7) << 18 | (bytes[1] & 0X3F) << 12 | (bytes[2] & 0X3F) << 6 | bytes[3] & 0x3F));
break;
}
}
receivedBytes = 0;
expectedBytes = 0;
}
}
else
{
for (int j = 0; j < receivedBytes; ++j)
{
result.append((char)bytes[j]);
}
receivedBytes = 0;
result.append(character);
}
}
else
{
for (int j = 0; j < receivedBytes; ++j)
{
result.append((char)bytes[j]);
}
receivedBytes = 0;
result.append(value.charAt(i));
}
}
return result.toString();
}
}
// Returns the character encoded by % followed by the two given hex digits,
// which is always 0xFF or less, so can safely be casted to a byte. If
// either character is not a hex digit, a bogus result will be returned.
protected static char unescape(char highHexDigit, char lowHexDigit)
{
return (char)((valueOf(highHexDigit) << 4) | valueOf(lowHexDigit));
}
// Returns the int value of the given hex digit.
protected static int valueOf(char hexDigit)
{
if (hexDigit <= '9')
{
if (hexDigit >= '0')
{
return hexDigit - '0';
}
}
else if (hexDigit <= 'F')
{
if (hexDigit >= 'A')
{
return hexDigit - 'A' + 10;
}
}
else if (hexDigit >= 'a' && hexDigit <= 'f')
{
return hexDigit - 'a' + 10;
}
return 0;
}
}
