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package org.apache.poi.openxml4j.opc;
import java.net.URI;
import java.net.URISyntaxException;
import org.apache.poi.openxml4j.exceptions.InvalidFormatException;
import org.apache.poi.openxml4j.exceptions.OpenXML4JRuntimeException;
/**
* An immutable Open Packaging Convention compliant part name.
*
* @author Julien Chable
*
* @see http://www.ietf.org/rfc/rfc3986.txt
*/
public final class PackagePartName implements Comparable {
/**
* Part name stored as an URI.
*/
private URI partNameURI;
/*
* URI Characters definition (RFC 3986)
*/
/**
* Reserved characters for sub delimitations.
*/
private static String[] RFC3986_PCHAR_SUB_DELIMS = { "!", "$", "&", "'",
"(", ")", "*", "+", ",", ";", "=" };
/**
* Unreserved character (+ ALPHA & DIGIT).
*/
private static String[] RFC3986_PCHAR_UNRESERVED_SUP = { "-", ".", "_", "~" };
/**
* Authorized reserved characters for pChar.
*/
private static String[] RFC3986_PCHAR_AUTHORIZED_SUP = { ":", "@" };
/**
* Flag to know if this part name is from a relationship part name.
*/
private boolean isRelationship;
/**
* Constructor. Makes a ValidPartName object from a java.net.URI
*
* @param uri
* The URI to validate and to transform into ValidPartName.
* @param checkConformance
* Flag to specify if the contructor have to validate the OPC
* conformance. Must be always true except for
* special URI like '/' which is needed for internal use by
* OpenXML4J but is not valid.
* @throws InvalidFormatException
* Throw if the specified part name is not conform to Open
* Packaging Convention specifications.
* @see java.net.URI
*/
PackagePartName(URI uri, boolean checkConformance)
throws InvalidFormatException {
if (checkConformance) {
throwExceptionIfInvalidPartUri(uri);
} else {
if (!PackagingURIHelper.PACKAGE_ROOT_URI.equals(uri)) {
throw new OpenXML4JRuntimeException(
"OCP conformance must be check for ALL part name except special cases : ['/']");
}
}
this.partNameURI = uri;
this.isRelationship = isRelationshipPartURI(this.partNameURI);
}
/**
* Constructor. Makes a ValidPartName object from a String part name.
*
* @param partName
* Part name to valid and to create.
* @param checkConformance
* Flag to specify if the contructor have to validate the OPC
* conformance. Must be always true except for
* special URI like '/' which is needed for internal use by
* OpenXML4J but is not valid.
* @throws InvalidFormatException
* Throw if the specified part name is not conform to Open
* Packaging Convention specifications.
*/
PackagePartName(String partName, boolean checkConformance)
throws InvalidFormatException {
URI partURI;
try {
partURI = new URI(partName);
} catch (URISyntaxException e) {
throw new IllegalArgumentException(
"partName argmument is not a valid OPC part name !");
}
if (checkConformance) {
throwExceptionIfInvalidPartUri(partURI);
} else {
if (!PackagingURIHelper.PACKAGE_ROOT_URI.equals(partURI)) {
throw new OpenXML4JRuntimeException(
"OCP conformance must be check for ALL part name except special cases : ['/']");
}
}
this.partNameURI = partURI;
this.isRelationship = isRelationshipPartURI(this.partNameURI);
}
/**
* Check if the specified part name is a relationship part name.
*
* @param partUri
* The URI to check.
* @return true if this part name respect the relationship
* part naming convention else false.
*/
private boolean isRelationshipPartURI(URI partUri) {
if (partUri == null)
throw new IllegalArgumentException("partUri");
return partUri.getPath().matches(
"^.*/" + PackagingURIHelper.RELATIONSHIP_PART_SEGMENT_NAME + "/.*\\"
+ PackagingURIHelper.RELATIONSHIP_PART_EXTENSION_NAME
+ "$");
}
/**
* Know if this part name is a relationship part name.
*
* @return true if this part name respect the relationship
* part naming convention else false.
*/
public boolean isRelationshipPartURI() {
return this.isRelationship;
}
/**
* Throws an exception (of any kind) if the specified part name does not
* follow the Open Packaging Convention specifications naming rules.
*
* @param partUri
* The part name to check.
* @throws Exception
* Throws if the part name is invalid.
*/
private static void throwExceptionIfInvalidPartUri(URI partUri)
throws InvalidFormatException {
if (partUri == null)
throw new IllegalArgumentException("partUri");
// Check if the part name URI is empty [M1.1]
throwExceptionIfEmptyURI(partUri);
// Check if the part name URI is absolute
throwExceptionIfAbsoluteUri(partUri);
// Check if the part name URI starts with a forward slash [M1.4]
throwExceptionIfPartNameNotStartsWithForwardSlashChar(partUri);
// Check if the part name URI ends with a forward slash [M1.5]
throwExceptionIfPartNameEndsWithForwardSlashChar(partUri);
// Check if the part name does not have empty segments. [M1.3]
// Check if a segment ends with a dot ('.') character. [M1.9]
throwExceptionIfPartNameHaveInvalidSegments(partUri);
}
/**
* Throws an exception if the specified URI is empty. [M1.1]
*
* @param partURI
* Part URI to check.
* @throws InvalidFormatException
* If the specified URI is empty.
*/
private static void throwExceptionIfEmptyURI(URI partURI)
throws InvalidFormatException {
if (partURI == null)
throw new IllegalArgumentException("partURI");
String uriPath = partURI.getPath();
if (uriPath.length() == 0
|| ((uriPath.length() == 1) && (uriPath.charAt(0) == PackagingURIHelper.FORWARD_SLASH_CHAR)))
throw new InvalidFormatException(
"A part name shall not be empty [M1.1]: "
+ partURI.getPath());
}
/**
* Throws an exception if the part name has empty segments. [M1.3]
*
* Throws an exception if a segment any characters other than pchar
* characters. [M1.6]
*
* Throws an exception if a segment contain percent-encoded forward slash
* ('/'), or backward slash ('\') characters. [M1.7]
*
* Throws an exception if a segment contain percent-encoded unreserved
* characters. [M1.8]
*
* Throws an exception if the specified part name's segments end with a dot
* ('.') character. [M1.9]
*
* Throws an exception if a segment doesn't include at least one non-dot
* character. [M1.10]
*
* @param partUri
* The part name to check.
* @throws InvalidFormatException
* if the specified URI contain an empty segments or if one the
* segments contained in the part name, ends with a dot ('.')
* character.
*/
private static void throwExceptionIfPartNameHaveInvalidSegments(URI partUri)
throws InvalidFormatException {
if (partUri == null) {
throw new IllegalArgumentException("partUri");
}
// Split the URI into several part and analyze each
String[] segments = partUri.toASCIIString().split("/");
if (segments.length <= 1 || !segments[0].equals(""))
throw new InvalidFormatException(
"A part name shall not have empty segments [M1.3]: "
+ partUri.getPath());
for (int i = 1; i < segments.length; ++i) {
String seg = segments[i];
if (seg == null || "".equals(seg)) {
throw new InvalidFormatException(
"A part name shall not have empty segments [M1.3]: "
+ partUri.getPath());
}
if (seg.endsWith(".")) {
throw new InvalidFormatException(
"A segment shall not end with a dot ('.') character [M1.9]: "
+ partUri.getPath());
}
if ("".equals(seg.replaceAll("\\\\.", ""))) {
// Normally will never been invoked with the previous
// implementation rule [M1.9]
throw new InvalidFormatException(
"A segment shall include at least one non-dot character. [M1.10]: "
+ partUri.getPath());
}
// Check for rule M1.6, M1.7, M1.8
checkPCharCompliance(seg);
}
}
/**
* Throws an exception if a segment any characters other than pchar
* characters. [M1.6]
*
* Throws an exception if a segment contain percent-encoded forward slash
* ('/'), or backward slash ('\') characters. [M1.7]
*
* Throws an exception if a segment contain percent-encoded unreserved
* characters. [M1.8]
*
* @param segment
* The segment to check
*/
private static void checkPCharCompliance(String segment)
throws InvalidFormatException {
boolean errorFlag;
for (int i = 0; i < segment.length(); ++i) {
char c = segment.charAt(i);
errorFlag = true;
/* Check rule M1.6 */
// Check for digit or letter
if ((c >= 'A' && c <= 'Z') || (c >= 'a' && c <= 'z')
|| (c >= '0' && c <= '9')) {
errorFlag = false;
} else {
// Check "-", ".", "_", "~"
for (int j = 0; j < RFC3986_PCHAR_UNRESERVED_SUP.length; ++j) {
if (c == RFC3986_PCHAR_UNRESERVED_SUP[j].charAt(0)) {
errorFlag = false;
break;
}
}
// Check ":", "@"
for (int j = 0; errorFlag
&& j < RFC3986_PCHAR_AUTHORIZED_SUP.length; ++j) {
if (c == RFC3986_PCHAR_AUTHORIZED_SUP[j].charAt(0)) {
errorFlag = false;
}
}
// Check "!", "$", "&", "'", "(", ")", "*", "+", ",", ";", "="
for (int j = 0; errorFlag
&& j < RFC3986_PCHAR_SUB_DELIMS.length; ++j) {
if (c == RFC3986_PCHAR_SUB_DELIMS[j].charAt(0)) {
errorFlag = false;
}
}
}
if (errorFlag && c == '%') {
// We certainly found an encoded character, check for length
// now ( '%' HEXDIGIT HEXDIGIT)
if (((segment.length() - i) < 2)) {
throw new InvalidFormatException("The segment " + segment
+ " contain invalid encoded character !");
}
// If not percent encoded character error occur then reset the
// flag -> the character is valid
errorFlag = false;
// Decode the encoded character
char decodedChar = (char) Integer.parseInt(segment.substring(
i + 1, i + 3), 16);
i += 2;
/* Check rule M1.7 */
if (decodedChar == '/' || decodedChar == '\\')
throw new InvalidFormatException(
"A segment shall not contain percent-encoded forward slash ('/'), or backward slash ('\') characters. [M1.7]");
/* Check rule M1.8 */
// Check for unreserved character like define in RFC3986
if ((decodedChar >= 'A' && decodedChar <= 'Z')
|| (decodedChar >= 'a' && decodedChar <= 'z')
|| (decodedChar >= '0' && decodedChar <= '9'))
errorFlag = true;
// Check for unreserved character "-", ".", "_", "~"
for (int j = 0; !errorFlag
&& j < RFC3986_PCHAR_UNRESERVED_SUP.length; ++j) {
if (c == RFC3986_PCHAR_UNRESERVED_SUP[j].charAt(0)) {
errorFlag = true;
break;
}
}
if (errorFlag)
throw new InvalidFormatException(
"A segment shall not contain percent-encoded unreserved characters. [M1.8]");
}
if (errorFlag)
throw new InvalidFormatException(
"A segment shall not hold any characters other than pchar characters. [M1.6]");
}
}
/**
* Throws an exception if the specified part name doesn't start with a
* forward slash character '/'. [M1.4]
*
* @param partUri
* The part name to check.
* @throws InvalidFormatException
* If the specified part name doesn't start with a forward slash
* character '/'.
*/
private static void throwExceptionIfPartNameNotStartsWithForwardSlashChar(
URI partUri) throws InvalidFormatException {
String uriPath = partUri.getPath();
if (uriPath.length() > 0
&& uriPath.charAt(0) != PackagingURIHelper.FORWARD_SLASH_CHAR)
throw new InvalidFormatException(
"A part name shall start with a forward slash ('/') character [M1.4]: "
+ partUri.getPath());
}
/**
* Throws an exception if the specified part name ends with a forwar slash
* character '/'. [M1.5]
*
* @param partUri
* The part name to check.
* @throws InvalidFormatException
* If the specified part name ends with a forwar slash character
* '/'.
*/
private static void throwExceptionIfPartNameEndsWithForwardSlashChar(
URI partUri) throws InvalidFormatException {
String uriPath = partUri.getPath();
if (uriPath.length() > 0
&& uriPath.charAt(uriPath.length() - 1) == PackagingURIHelper.FORWARD_SLASH_CHAR)
throw new InvalidFormatException(
"A part name shall not have a forward slash as the last character [M1.5]: "
+ partUri.getPath());
}
/**
* Throws an exception if the specified URI is absolute.
*
* @param partUri
* The URI to check.
* @throws InvalidFormatException
* Throws if the specified URI is absolute.
*/
private static void throwExceptionIfAbsoluteUri(URI partUri)
throws InvalidFormatException {
if (partUri.isAbsolute())
throw new InvalidFormatException("Absolute URI forbidden: "
+ partUri);
}
/**
* Compare two part name following the rule M1.12 :
*
* Part name equivalence is determined by comparing part names as
* case-insensitive ASCII strings. Packages shall not contain equivalent
* part names and package implementers shall neither create nor recognize
* packages with equivalent part names. [M1.12]
*/
public int compareTo(PackagePartName otherPartName) {
if (otherPartName == null)
return -1;
return this.partNameURI.toASCIIString().toLowerCase().compareTo(
otherPartName.partNameURI.toASCIIString().toLowerCase());
}
/**
* Retrieves the extension of the part name if any. If there is no extension
* returns an empty String. Example : '/document/content.xml' => 'xml'
*
* @return The extension of the part name.
*/
public String getExtension() {
String fragment = this.partNameURI.getPath();
if (fragment.length() > 0) {
int i = fragment.lastIndexOf(".");
if (i > -1)
return fragment.substring(i + 1);
}
return "";
}
/**
* Get this part name.
*
* @return The name of this part name.
*/
public String getName() {
return this.partNameURI.toASCIIString();
}
/**
* Part name equivalence is determined by comparing part names as
* case-insensitive ASCII strings. Packages shall not contain equivalent
* part names and package implementers shall neither create nor recognize
* packages with equivalent part names. [M1.12]
*/
@Override
public boolean equals(Object otherPartName) {
if (otherPartName == null
|| !(otherPartName instanceof PackagePartName))
return false;
return this.partNameURI.toASCIIString().toLowerCase().equals(
((PackagePartName) otherPartName).partNameURI.toASCIIString()
.toLowerCase());
}
@Override
public int hashCode() {
return this.partNameURI.toASCIIString().toLowerCase().hashCode();
}
@Override
public String toString() {
return getName();
}
/* Getters and setters */
/**
* Part name property getter.
*
* @return This part name URI.
*/
public URI getURI() {
return this.partNameURI;
}
}