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/* Woodstox XML processor
*
* Copyright (c) 2004- Tatu Saloranta, [email protected]
*
* Licensed under the License specified in file LICENSE, included with
* the source code.
* You may not use this file except in compliance with the License.
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.ctc.wstx.sr;
import java.io.IOException;
import java.util.Arrays;
import javax.xml.XMLConstants;
import javax.xml.stream.Location;
import javax.xml.stream.XMLStreamException;
import javax.xml.namespace.QName;
import org.codehaus.stax2.ri.typed.CharArrayBase64Decoder;
import org.codehaus.stax2.ri.typed.ValueDecoderFactory;
import org.codehaus.stax2.typed.Base64Variant;
import org.codehaus.stax2.typed.TypedArrayDecoder;
import org.codehaus.stax2.typed.TypedValueDecoder;
import org.codehaus.stax2.typed.TypedXMLStreamException;
import org.codehaus.stax2.validation.XMLValidator;
import com.ctc.wstx.api.ReaderConfig;
import com.ctc.wstx.cfg.ErrorConsts;
import com.ctc.wstx.sw.XmlWriter;
import com.ctc.wstx.util.*;
/**
* Shared base class that defines API stream reader uses to communicate
* with the attribute collector implementation, independent of whether it's
* operating in namespace-aware or non-namespace modes.
* Collector class is used to build up attribute lists; for the most part
* will just hold references to few specialized {@link TextBuilder}s that
* are used to create efficient semi-shared value Strings.
*/
public final class AttributeCollector
{
final static int INT_SPACE = 0x0020;
/**
* Threshold value that indicates minimum length for lists instances
* that need a Map structure, for fast attribute access by fully-qualified
* name.
*/
protected final static int LONG_ATTR_LIST_LEN = 4;
/**
* Expected typical maximum number of attributes for any element;
* chosen to minimize need to resize, while trying not to waste space.
* Dynamically grown; better not to set too high to avoid excessive
* overhead for small attribute-less documents.
*/
protected final static int EXP_ATTR_COUNT = 12;
protected final static int EXP_NS_COUNT = 6;
/**
* This value is used to indicate that we shouldn't keep track
* of index of xml:id attribute -- generally done when Xml:id
* support is disabled
*/
protected final static int XMLID_IX_DISABLED = -2;
protected final static int XMLID_IX_NONE = -1;
protected final static InternCache sInternCache = InternCache.getInstance();
/*
///////////////////////////////////////////////////////////
// Configuration
///////////////////////////////////////////////////////////
*/
// // Settings for matching Xml:id attribute
final String mXmlIdPrefix;
final String mXmlIdLocalName;
/*
///////////////////////////////////////////////////////////
// Collected attribute (incl namespace attrs) information:
///////////////////////////////////////////////////////////
*/
/**
* Array of attributes collected for this element.
*/
protected Attribute[] mAttributes;
/**
* Actual number of attributes collected, including attributes
* added via default values.
*/
protected int mAttrCount;
/**
* Number of attribute values actually parsed, not including
* ones created via default value expansion. Equal to or less than
* {@link #mAttrCount}.
*/
protected int mNonDefCount;
/**
* Array of namespace declaration attributes collected for this element;
* not used in non-namespace-aware mode
*/
protected Attribute[] mNamespaces;
/**
* Number of valid namespace declarations in {@link #mNamespaces}.
*/
protected int mNsCount;
/**
* Flag to indicate whether the default namespace has already been declared
* for the current element.
*/
protected boolean mDefaultNsDeclared = false;
/**
* Index of "xml:id" attribute, if one exists for the current
* element; {@link #XMLID_IX_NONE} if none.
*/
protected int mXmlIdAttrIndex;
/*
///////////////////////////////////////////////////////////
// Attribute (and ns) value builders
///////////////////////////////////////////////////////////
*/
/**
* TextBuilder into which values of all attributes are appended
* to, including default valued ones (defaults are added after
* explicit ones).
* Constructed lazily, if and when needed (not needed
* for short attribute-less docs)
*/
protected TextBuilder mValueBuilder = null;
/**
* TextBuilder into which values of namespace URIs are added (including
* URI for the default namespace, if one defined).
*/
private final TextBuilder mNamespaceBuilder = new TextBuilder(EXP_NS_COUNT);
/*
//////////////////////////////////////////////////////////////
// Information that defines "Map-like" data structure used for
// quick access to attribute values by fully-qualified name
//////////////////////////////////////////////////////////////
*/
/**
* Encoding of a data structure that contains mapping from
* attribute names to attribute index in main attribute name arrays.
*
* Data structure contains two separate areas; main hash area (with
* size mAttrHashSize), and remaining spillover area
* that follows hash area up until (but not including)
* mAttrSpillEnd index.
* Main hash area only contains indexes (index+1; 0 signifying empty slot)
* to actual attributes; spillover area has both hash and index for
* any spilled entry. Spilled entries are simply stored in order
* added, and need to be searched using linear search. In case of both
* primary hash hits and spills, eventual comparison with the local
* name needs to be done with actual name array.
*/
protected int[] mAttrMap = null;
/**
* Size of hash area in mAttrMap; generally at least 20%
* more than number of attributes (mAttrCount).
*/
protected int mAttrHashSize;
/**
* Pointer to int slot right after last spill entr, in
* mAttrMap array.
*/
protected int mAttrSpillEnd;
protected int mMaxAttributesPerElement;
protected int mMaxAttributeSize;
/*
///////////////////////////////////////////////
// Life-cycle:
///////////////////////////////////////////////
*/
protected AttributeCollector(ReaderConfig cfg, boolean nsAware)
{
mXmlIdAttrIndex = cfg.willDoXmlIdTyping() ? XMLID_IX_NONE : XMLID_IX_DISABLED;
if (nsAware) {
mXmlIdPrefix = "xml";
mXmlIdLocalName = "id";
} else {
mXmlIdPrefix = null;
mXmlIdLocalName = "xml:id";
}
mMaxAttributesPerElement = cfg.getMaxAttributesPerElement();
mMaxAttributeSize = cfg.getMaxAttributeSize();
}
/**
* Method called to allow reusing of collector, usually right before
* starting collecting attributes for a new start tag.
*/
/**
* Method called to allow reusing of collector, usually right before
* starting collecting attributes for a new start tag.
*
* Note: public only so that it can be called by unit tests.
*/
public void reset()
{
if (mNsCount > 0) {
mNamespaceBuilder.reset();
mDefaultNsDeclared = false;
mNsCount = 0;
}
/* No need to clear attr name, or NS prefix Strings; they are
* canonicalized and will be referenced by symbol table in any
* case... so we can save trouble of cleaning them up. This Object
* will get GC'ed soon enough, after parser itself gets disposed of.
*/
if (mAttrCount > 0) {
mValueBuilder.reset();
mAttrCount = 0;
if (mXmlIdAttrIndex >= 0) {
mXmlIdAttrIndex = XMLID_IX_NONE;
}
}
/* Note: attribute values will be cleared later on, when validating
* namespaces. This so that we know how much to clean up; and
* occasionally can also just avoid clean up (when resizing)
*/
}
/**
* Method that can be called to force space normalization (remove
* leading/trailing spaces, replace non-spaces white space with
* spaces, collapse spaces to one) on specified attribute.
* Currently called by {@link InputElementStack} to force
* normalization of Xml:id attribute
*/
public void normalizeSpacesInValue(int index)
{
// StringUtil has a method, but it works on char arrays...
char[] attrCB = mValueBuilder.getCharBuffer();
String normValue = StringUtil.normalizeSpaces
(attrCB, getValueStartOffset(index), getValueStartOffset(index+1));
if (normValue != null) {
mAttributes[index].setValue(normValue);
}
}
/*
///////////////////////////////////////////////
// Public accesors (for stream reader)
///////////////////////////////////////////////
*/
/**
* @return Number of namespace declarations collected, including
* possible default namespace declaration
*/
protected int getNsCount() {
return mNsCount;
}
public boolean hasDefaultNs() {
return mDefaultNsDeclared;
}
// // // Direct access to attribute/NS prefixes/localnames/URI
public final int getCount() {
return mAttrCount;
}
/**
* @return Number of attributes that were explicitly specified; may
* be less than the total count due to attributes created using
* attribute default values
*/
public int getSpecifiedCount() {
return mNonDefCount;
}
public String getNsPrefix(int index) {
if (index < 0 || index >= mNsCount) {
throwIndex(index);
}
// for NS decls, local name is stored in prefix
return mNamespaces[index].mLocalName;
}
public String getNsURI(int index) {
if (index < 0 || index >= mNsCount) {
throwIndex(index);
}
return mNamespaces[index].mNamespaceURI;
}
// // // Direct access to attribute/NS prefixes/localnames/URI
public String getPrefix(int index) {
if (index < 0 || index >= mAttrCount) {
throwIndex(index);
}
return mAttributes[index].mPrefix;
}
public String getLocalName(int index) {
if (index < 0 || index >= mAttrCount) {
throwIndex(index);
}
return mAttributes[index].mLocalName;
}
public String getURI(int index) {
if (index < 0 || index >= mAttrCount) {
throwIndex(index);
}
return mAttributes[index].mNamespaceURI;
}
public QName getQName(int index) {
if (index < 0 || index >= mAttrCount) {
throwIndex(index);
}
return mAttributes[index].getQName();
}
/**
*
* Note: the main reason this method is defined at this level, and
* made final, is performance. JIT may be able to fully inline this
* method, even when reference is via this base class. This is important
* since this is likely to be the most often called method of the
* collector instances.
*/
public final String getValue(int index)
{
if (index < 0 || index >= mAttrCount) {
throwIndex(index);
}
String full = mValueBuilder.getAllValues();
Attribute attr = mAttributes[index];
++index;
if (index < mAttrCount) { // not last
int endOffset = mAttributes[index].mValueStartOffset;
return attr.getValue(full, endOffset);
}
// last can be optimized bit more:
return attr.getValue(full);
}
public String getValue(String nsURI, String localName)
{
// Primary hit?
int hashSize = mAttrHashSize;
if (hashSize == 0) { // sanity check, for 'no attributes'
return null;
}
int hash = localName.hashCode();
if (nsURI != null) {
if (nsURI.length() == 0) {
nsURI = null;
} else {
hash ^= nsURI.hashCode();
}
}
int ix = mAttrMap[hash & (hashSize-1)];
if (ix == 0) { // nothing in here; no spills either
return null;
}
--ix;
// Is primary candidate match?
if (mAttributes[ix].hasQName(nsURI, localName)) {
return getValue(ix);
}
/* Nope, need to traverse spill list, which has 2 entries for
* each spilled attribute id; first for hash value, second index.
*/
for (int i = hashSize, len = mAttrSpillEnd; i < len; i += 2) {
if (mAttrMap[i] != hash) {
continue;
}
/* Note: spill indexes are not off-by-one, since there's no need
* to mask 0
*/
ix = mAttrMap[i+1];
if (mAttributes[ix].hasQName(nsURI, localName)) {
return getValue(ix);
}
}
return null;
}
public int getMaxAttributesPerElement() {
return mMaxAttributesPerElement;
}
public void setMaxAttributesPerElement(int maxAttributesPerElement) {
this.mMaxAttributesPerElement = maxAttributesPerElement;
}
public int findIndex(String localName) {
return findIndex(null, localName);
}
public int findIndex(String nsURI, String localName)
{
/* Note: most of the code is from getValue().. could refactor
* code, performance is bit of concern (one more method call
* if index access was separate).
* See comments on that method, for logics.
*/
// Primary hit?
int hashSize = mAttrHashSize;
if (hashSize == 0) { // sanity check, for 'no attributes'
return -1;
}
int hash = localName.hashCode();
if (nsURI != null) {
if (nsURI.length() == 0) {
nsURI = null;
} else {
hash ^= nsURI.hashCode();
}
}
int ix = mAttrMap[hash & (hashSize-1)];
if (ix == 0) { // nothing in here; no spills either
return -1;
}
--ix;
// Is primary candidate match?
if (mAttributes[ix].hasQName(nsURI, localName)) {
return ix;
}
/* Nope, need to traverse spill list, which has 2 entries for
* each spilled attribute id; first for hash value, second index.
*/
for (int i = hashSize, len = mAttrSpillEnd; i < len; i += 2) {
if (mAttrMap[i] != hash) {
continue;
}
/* Note: spill indexes are not off-by-one, since there's no need
* to mask 0
*/
ix = mAttrMap[i+1];
if (mAttributes[ix].hasQName(nsURI, localName)) {
return ix;
}
}
return -1;
}
public final boolean isSpecified(int index) {
return (index < mNonDefCount);
}
public final int getXmlIdAttrIndex() {
return mXmlIdAttrIndex;
}
/*
//////////////////////////////////////////////////////
// Type-safe accessors to support TypedXMLStreamReader
//////////////////////////////////////////////////////
*/
/**
* Method called to decode the whole attribute value as a single
* typed value.
* Decoding is done using the decoder provided.
*/
public final void decodeValue(int index, TypedValueDecoder tvd)
throws IllegalArgumentException
{
if (index < 0 || index >= mAttrCount) {
throwIndex(index);
}
/* Should be faster to pass the char array even if we might
* have a String
*/
// Either way, need to trim before passing:
char[] buf = mValueBuilder.getCharBuffer();
int start = mAttributes[index].mValueStartOffset;
int end = getValueStartOffset(index+1);
while (true) {
if (start >= end) {
tvd.handleEmptyValue();
return;
}
if (!StringUtil.isSpace(buf[start])) {
break;
}
++start;
}
// Trailing space?
while (--end > start && StringUtil.isSpace(buf[end])) { }
tvd.decode(buf, start, end+1);
}
/**
* Method called to decode the attribute value that consists of
* zero or more space-separated tokens.
* Decoding is done using the decoder provided.
* @return Number of tokens decoded
*/
public final int decodeValues(int index, TypedArrayDecoder tad,
InputProblemReporter rep)
throws XMLStreamException
{
if (index < 0 || index >= mAttrCount) {
throwIndex(index);
}
// Char[] faster than String... and no need to trim here:
return decodeValues(tad, rep,
mValueBuilder.getCharBuffer(),
mAttributes[index].mValueStartOffset,
getValueStartOffset(index+1));
}
public final byte[] decodeBinary(int index, Base64Variant v, CharArrayBase64Decoder dec,
InputProblemReporter rep)
throws XMLStreamException
{
if (index < 0 || index >= mAttrCount) {
throwIndex(index);
}
/* No point in trying to use String representation, even if one
* available, faster to process from char[]
*/
Attribute attr = mAttributes[index];
char[] cbuf = mValueBuilder.getCharBuffer();
int start = attr.mValueStartOffset;
int end = getValueStartOffset(index+1);
int len = end-start;
dec.init(v, true, cbuf, start, len, null);
try {
return dec.decodeCompletely();
} catch (IllegalArgumentException iae) {
// Need to convert to a checked stream exception
String lexical = new String(cbuf, start, len);
throw new TypedXMLStreamException(lexical, iae.getMessage(), rep.getLocation(), iae);
}
}
private final static int decodeValues(TypedArrayDecoder tad,
InputProblemReporter rep,
final char[] buf, int ptr, final int end)
throws XMLStreamException
{
int start = ptr;
int count = 0;
try {
decode_loop:
while (ptr < end) {
// First, any space to skip?
while (buf[ptr] <= INT_SPACE) {
if (++ptr >= end) {
break decode_loop;
}
}
// Then let's figure out non-space char (token)
start = ptr;
++ptr;
while (ptr < end && buf[ptr] > INT_SPACE) {
++ptr;
}
int tokenEnd = ptr;
++ptr; // to skip trailing space (or, beyond end)
// Ok, decode... any more room?
++count;
if (tad.decodeValue(buf, start, tokenEnd)) {
if (!checkExpand(tad)) {
break;
}
}
}
} catch (IllegalArgumentException iae) {
// Need to convert to a checked stream exception
Location loc = rep.getLocation();
String lexical = new String(buf, start, (ptr-start));
throw new TypedXMLStreamException(lexical, iae.getMessage(), loc, iae);
}
return count;
}
/**
* Internal method used to see if we can expand the buffer that
* the array decoder has. Bit messy, but simpler than having
* separately typed instances; and called rarely so that performance
* downside of instanceof is irrelevant.
*/
private final static boolean checkExpand(TypedArrayDecoder tad)
{
if (tad instanceof ValueDecoderFactory.BaseArrayDecoder) {
((ValueDecoderFactory.BaseArrayDecoder) tad).expand();
return true;
}
return false;
}
/*
///////////////////////////////////////////////
// Accessors for accessing helper objects
///////////////////////////////////////////////
*/
/**
* Method for getting start pointer within shared value buffer
* for given attribute. It is also the same as end pointer
* for preceding attribute, if any.
*/
protected int getValueStartOffset(int index)
{
if (index < mAttrCount) {
return mAttributes[index].mValueStartOffset;
}
return mValueBuilder.getCharSize();
}
protected char[] getSharedValueBuffer()
{
return mValueBuilder.getCharBuffer();
}
/**
* Method called to resolve and initialize specified collected
* namespace declaration
*
* @return Attribute that contains specified namespace declaration
*/
protected Attribute resolveNamespaceDecl(int index, boolean internURI)
{
Attribute ns = mNamespaces[index];
String full = mNamespaceBuilder.getAllValues();
String uri;
if (mNsCount == 0) {
uri = full;
} else {
++index;
if (index < mNsCount) { // not last
int endOffset = mNamespaces[index].mValueStartOffset;
uri = ns.getValue(full, endOffset);
} else { // is last
uri = ns.getValue(full);
}
}
if (internURI && uri.length() > 0) {
uri = sInternCache.intern(uri);
}
ns.mNamespaceURI = uri;
return ns;
}
/**
* Method needed by event creating code, to build a non-transient
* attribute container, to use with XMLEvent objects (specifically
* implementation of StartElement event).
*/
public ElemAttrs buildAttrOb()
{
int count = mAttrCount;
if (count == 0) {
return null;
}
/* If we have actual attributes, let's first just create the
* raw array that has all attribute information:
*/
String[] raw = new String[count << 2];
for (int i = 0; i < count; ++i) {
Attribute attr = mAttributes[i];
int ix = (i << 2);
raw[ix] = attr.mLocalName;
raw[ix+1] = attr.mNamespaceURI;
raw[ix+2] = attr.mPrefix;
raw[ix+3] = getValue(i);
}
// Do we have a "short" list?
if (count < LONG_ATTR_LIST_LEN) {
return new ElemAttrs(raw, mNonDefCount);
}
// Ok, nope; we need to also pass the Map information...
/* 02-Feb-2009, TSa: Must make a copy of the Map array now,
* otherwise could get overwritten.
*/
int amapLen = mAttrMap.length;
int[] amap = new int[amapLen];
// TODO: JDK 1.6 has Arrays.copyOf(), should use with Woodstox 6
System.arraycopy(mAttrMap, 0, amap, 0, amapLen);
return new ElemAttrs(raw, mNonDefCount,
amap, mAttrHashSize, mAttrSpillEnd);
}
protected void validateAttribute(int index, XMLValidator vld)
throws XMLStreamException
{
Attribute attr = mAttributes[index];
String normValue = vld.validateAttribute
(attr.mLocalName, attr.mNamespaceURI, attr.mPrefix,
mValueBuilder.getCharBuffer(),
getValueStartOffset(index),
getValueStartOffset(index+1));
if (normValue != null) {
attr.setValue(normValue);
}
}
/*
///////////////////////////////////////////////
// Attribute, namespace decl building
///////////////////////////////////////////////
*/
/**
* Low-level accessor method that attribute validation code may call
* for certain types of attributes; generally only for id and idref/idrefs
* attributes. It returns the underlying 'raw' attribute value buffer
* for direct access.
*/
public final TextBuilder getAttrBuilder(String attrPrefix, String attrLocalName) throws XMLStreamException
{
/* Ok: we have parsed prefixed-name of a regular
* attribute. So let's initialize the instance...
*/
if (mAttrCount == 0) {
if (mAttributes == null) {
allocBuffers();
}
mAttributes[0] = new Attribute(attrPrefix, attrLocalName, 0);
} else {
int valueStart = mValueBuilder.getCharSize();
if (mAttrCount >= mAttributes.length) {
if ((mAttrCount + mNsCount) >= mMaxAttributesPerElement) {
throw new XMLStreamException("Attribute limit ("+mMaxAttributesPerElement+") exceeded");
}
mAttributes = (Attribute[]) DataUtil.growArrayBy50Pct(mAttributes);
}
Attribute curr = mAttributes[mAttrCount];
if (curr == null) {
mAttributes[mAttrCount] = new Attribute(attrPrefix, attrLocalName, valueStart);
} else {
curr.reset(attrPrefix, attrLocalName, valueStart);
}
}
++mAttrCount;
// 25-Sep-2006, TSa: Need to keep track of xml:id attribute?
if (attrLocalName == mXmlIdLocalName) {
if (attrPrefix == mXmlIdPrefix) {
if (mXmlIdAttrIndex != XMLID_IX_DISABLED) {
mXmlIdAttrIndex = mAttrCount - 1;
}
}
}
/* Can't yet create attribute map by name, since we only know
* name prefix, not necessarily matching URI.
*/
return mValueBuilder;
}
/**
* Method called by validator to insert an attribute that has a default
* value and wasn't yet included in collector's attribute set.
*
* @return Index of the newly added attribute, if added; -1 to indicate
* this was a duplicate
*/
public int addDefaultAttribute(String localName, String uri, String prefix,
String value) throws XMLStreamException
{
int attrIndex = mAttrCount;
if (attrIndex < 1) {
/* had no explicit attributes... better initialize now, then.
* Let's just use hash area of 4, and
*/
initHashArea();
}
/* Ok, first, since we do want to verify that we can not accidentally
* add duplicates, let's first try to add entry to Map, since that
* will catch dups.
*/
int hash = localName.hashCode();
if (uri != null && uri.length() > 0) {
hash ^= uri.hashCode();
}
int index = hash & (mAttrHashSize - 1);
int[] map = mAttrMap;
if (map[index] == 0) { // whoa, have room...
map[index] = attrIndex+1; // add 1 to get 1-based index (0 is empty marker)
} else { // nah, collision...
int currIndex = map[index]-1; // Index of primary collision entry
int spillIndex = mAttrSpillEnd;
map = spillAttr(uri, localName, map, currIndex, spillIndex,
attrIndex, hash, mAttrHashSize);
if (map == null) { // dup!
return -1; // could return negation (-(index+1)) of the prev index?
}
map[++spillIndex] = attrIndex; // no need to specifically avoid 0
mAttrMap = map;
mAttrSpillEnd = ++spillIndex;
}
/* Can reuse code; while we don't really need the builder,
* we need to add/reset attribute
*/
getAttrBuilder(prefix, localName);
Attribute attr = mAttributes[mAttrCount-1];
attr.mNamespaceURI = uri;
attr.setValue(value);
// attribute count has been updated; index is one less than count
return (mAttrCount-1);
}
/**
* Low-level mutator method that attribute validation code may call
* for certain types of attributes, when it wants to handle the whole
* validation and normalization process by itself. It is generally
* only called for id and idref/idrefs attributes, as those values
* are usually normalized.
*/
public final void setNormalizedValue(int index, String value)
{
mAttributes[index].setValue(value);
}
/**
* @return null if the default namespace URI has been already declared
* for the current element; TextBuilder to add URI to if not.
*/
public TextBuilder getDefaultNsBuilder() throws XMLStreamException
{
if (mDefaultNsDeclared) {
return null;
}
mDefaultNsDeclared = true;
return getNsBuilder(null);
}
/**
* @return null if prefix has been already declared; TextBuilder to
* add value to if not.
*/
public TextBuilder getNsBuilder(String prefix) throws XMLStreamException
{
// first: must verify that it's not a dup
if (mNsCount == 0) {
if (mNamespaces == null) {
mNamespaces = new Attribute[EXP_NS_COUNT];
}
mNamespaces[0] = new Attribute(null, prefix, 0);
} else {
int len = mNsCount;
/* Ok: must ensure that there are no duplicate namespace
* declarations (ie. decls with same prefix being bound)
*/
if (prefix != null) { // null == default ns
for (int i = 0; i < len; ++i) {
// note: for ns decls, bound prefix is in 'local name'
if (prefix == mNamespaces[i].mLocalName) {
return null;
}
}
}
if (len >= mNamespaces.length) {
if ((mAttrCount + mNsCount) >= mMaxAttributesPerElement) {
throw new XMLStreamException("Attribute limit ("+mMaxAttributesPerElement+") exceeded");
}
mNamespaces = (Attribute[]) DataUtil.growArrayBy50Pct(mNamespaces);
}
int uriStart = mNamespaceBuilder.getCharSize();
Attribute curr = mNamespaces[len];
if (curr == null) {
mNamespaces[len] = new Attribute(null, prefix, uriStart);
} else {
curr.reset(null, prefix, uriStart);
}
}
++mNsCount;
return mNamespaceBuilder;
}
/**
* Method called to resolve namespace URIs from attribute prefixes.
*
* Note: public only so that it can be called by unit tests.
*
* @param rep Reporter to use for reporting well-formedness problems
* @param ns Namespace prefix/URI mappings active for this element
*
* @return Index of xml:id attribute, if any, -1 if not
*/
public int resolveNamespaces(InputProblemReporter rep, StringVector ns)
throws XMLStreamException
{
int attrCount = mAttrCount;
/* Let's now set number of 'real' attributes, to allow figuring
* out number of attributes created via default value expansion
*/
mNonDefCount = attrCount;
if (attrCount < 1) {
// Checked if doing access by FQN:
mAttrHashSize = mAttrSpillEnd = 0;
// And let's just bail out, too...
return mXmlIdAttrIndex;
}
for (int i = 0; i < attrCount; ++i) {
Attribute attr = mAttributes[i];
String prefix = attr.mPrefix;
// Attributes' ns URI is null after reset, so can skip setting "no namespace"
if (prefix != null) {
if (prefix == "xml") {
attr.mNamespaceURI = XMLConstants.XML_NS_URI;
} else {
String uri = ns.findLastFromMap(prefix);
if (uri == null) {
rep.throwParseError(ErrorConsts.ERR_NS_UNDECLARED_FOR_ATTR,
prefix, attr.mLocalName);
}
attr.mNamespaceURI = uri;
}
}
}
/* Ok, finally, let's create attribute map, to allow efficient
* access by prefix+localname combination. Could do it on-demand,
* but this way we can check for duplicates right away.
*/
int[] map = mAttrMap;
/* What's minimum size to contain at most 80% full hash area,
* plus 1/8 spill area (12.5% spilled entries, two ints each)?
*/
int hashCount = 4;
{
int min = attrCount + (attrCount >> 2); // == 80% fill rate
/* Need to get 2^N size that can contain all elements, with
* 80% fill rate
*/
while (hashCount < min) {
hashCount += hashCount; // 2x
}
// And then add the spill area
mAttrHashSize = hashCount;
min = hashCount + (hashCount >> 4); // 12.5 x 2 ints
if (map == null || map.length < min) {
map = new int[min];
} else {
/* Need to clear old hash entries (if any). But note that
* spilled entries we can leave alone -- they are just ints,
* and get overwritten if and as needed
*/
Arrays.fill(map, 0, hashCount, 0);
}
}
{
int mask = hashCount-1;
int spillIndex = hashCount;
// Ok, array's fine, let's hash 'em in!
for (int i = 0; i < attrCount; ++i) {
Attribute attr = mAttributes[i];
String name = attr.mLocalName;
int hash = name.hashCode();
String uri = attr.mNamespaceURI;
if (uri != null) {
hash ^= uri.hashCode();
}
int index = hash & mask;
// Hash slot available?
if (map[index] == 0) {
map[index] = i+1; // since 0 is marker
} else {
int currIndex = map[index]-1;
/* nope, need to spill; let's extract most of that code to
* a separate method for clarity (and maybe it'll be
* easier to inline by JVM too)
*/
map = spillAttr(uri, name, map, currIndex, spillIndex,
attrCount, hash, hashCount);
if (map == null) {
throwDupAttr(rep, currIndex);
// never returns here...
} else { // let's use else to keep FindBugs happy
map[++spillIndex] = i; // no need to specifically avoid 0
++spillIndex;
}
}
}
mAttrSpillEnd = spillIndex;
}
mAttrMap = map;
return mXmlIdAttrIndex;
}
/*
///////////////////////////////////////////////
// Package/core methods:
///////////////////////////////////////////////
*/
protected void throwIndex(int index) {
throw new IllegalArgumentException("Invalid index "+index+"; current element has only "+getCount()+" attributes");
}
/**
* Method that basically serializes the specified (read-in) attribute
* using Writers provided. Serialization is done by
* writing out (fully-qualified) name
* of the attribute, followed by the equals sign and quoted value.
*/
public void writeAttribute(int index, XmlWriter xw)
throws IOException, XMLStreamException
{
// Note: here we assume index checks have been done by caller
Attribute attr = mAttributes[index];
String ln = attr.mLocalName;
String prefix = attr.mPrefix;
if (prefix == null || prefix.length() == 0) {
xw.writeAttribute(ln, getValue(index));
} else {
xw.writeAttribute(prefix, ln, getValue(index));
}
}
/**
* Method called to initialize buffers that need not be immediately
* initialized
*/
protected final void allocBuffers()
{
if (mAttributes == null) {
mAttributes = new Attribute[8];
}
if (mValueBuilder == null) {
mValueBuilder = new TextBuilder(EXP_ATTR_COUNT);
}
}
/*
///////////////////////////////////////////////
// Internal methods:
///////////////////////////////////////////////
*/
/**
* @return Null, if attribute is a duplicate (to indicate error);
* map itself, or resized version, otherwise.
*/
private int[] spillAttr(String uri, String name,
int[] map, int currIndex, int spillIndex, int attrCount,
int hash, int hashCount)
{
// Do we have a dup with primary entry?
/* Can do equality comp for local name, as they
* are always canonicalized:
*/
Attribute oldAttr = mAttributes[currIndex];
if (oldAttr.mLocalName == name) {
// URIs may or may not be interned though:
String currURI = oldAttr.mNamespaceURI;
if (currURI == uri || (currURI != null && currURI.equals(uri))) {
return null;
}
}
/* Is there room to spill into? (need to 2 int spaces; one for hash,
* the other for index)
*/
if ((spillIndex + 1)>= map.length) {
// Let's just add room for 4 spills...
map = DataUtil.growArrayBy(map, 8);
}
// Let's first ensure we aren't adding a dup:
for (int j = hashCount; j < spillIndex; j += 2) {
if (map[j] == hash) {
currIndex = map[j+1];
Attribute attr = mAttributes[currIndex];
if (attr.mLocalName == name) {
String currURI = attr.mNamespaceURI;
if (currURI == uri || (currURI != null && currURI.equals(uri))) {
return null;
}
}
}
}
map[spillIndex] = hash;
return map;
}
/**
* Method called to ensure hash area will be properly set up in
* cases where initially no room was needed, but default attribute(s)
* is being added.
*/
private void initHashArea()
{
/* Let's use small hash area of size 4, and one spill; don't
* want too big (need to clear up room), nor too small (only
* collisions)
*/
mAttrHashSize = mAttrSpillEnd = 4;
if (mAttrMap == null || mAttrMap.length < mAttrHashSize) {
mAttrMap = new int[mAttrHashSize+1];
}
mAttrMap[0] = mAttrMap[1] = mAttrMap[2] = mAttrMap[3] = 0;
allocBuffers();
}
/**
* Method that can be used to get the specified attribute value,
* by getting it written using Writer passed in. Can potentially
* save one String allocation, since no (temporary) Strings need
* to be created.
*/
/*
protected final void writeValue(int index, Writer w)
throws IOException
{
mValueBuilder.getEntry(index, w);
}
*/
protected void throwDupAttr(InputProblemReporter rep, int index)
throws XMLStreamException
{
rep.throwParseError("Duplicate attribute '"+getQName(index)+"'.");
}
}