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Xerces2 is the next generation of high performance, fully compliant XML parsers in the Apache Xerces family.
This new version of Xerces introduces the Xerces Native Interface (XNI), a complete framework for building
parser components and configurations that is extremely modular and easy to program. The Apache Xerces2 parser is
the reference implementation of XNI but other parser components, configurations, and parsers can be written
using the Xerces Native Interface. For complete design and implementation documents, refer to the XNI Manual.
Xerces2 is a fully conforming XML Schema 1.0 processor. A partial experimental implementation of the XML Schema
1.1 Structures and Datatypes Working Drafts (December 2009) and an experimental implementation of the XML Schema
Definition Language (XSD): Component Designators (SCD) Candidate Recommendation (January 2010) are provided for
evaluation. For more information, refer to the XML Schema page. Xerces2 also provides a complete implementation
of the Document Object Model Level 3 Core and Load/Save W3C Recommendations and provides a complete
implementation of the XML Inclusions (XInclude) W3C Recommendation. It also provides support for OASIS XML
Catalogs v1.1. Xerces2 is able to parse documents written according to the XML 1.1 Recommendation, except that
it does not yet provide an option to enable normalization checking as described in section 2.13 of this
specification. It also handles namespaces according to the XML Namespaces 1.1 Recommendation, and will correctly
serialize XML 1.1 documents if the DOM level 3 load/save APIs are in use.
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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* 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 org.apache.xerces.xpointer;
import org.apache.xerces.impl.Constants;
import org.apache.xerces.impl.dv.XSSimpleType;
import org.apache.xerces.util.SymbolTable;
import org.apache.xerces.xni.Augmentations;
import org.apache.xerces.xni.QName;
import org.apache.xerces.xni.XMLAttributes;
import org.apache.xerces.xni.XNIException;
import org.apache.xerces.xs.AttributePSVI;
import org.apache.xerces.xs.XSTypeDefinition;
/**
*
* Implements the XPointerPart interface and handles processing of
* ShortHand Pointers. It identifies at most one element in the
* resource's information set; specifically, the first one (if any)
* in document order that has a matching NCName as an identifier.
*
*
* @version $Id: ShortHandPointer.java 603808 2007-12-13 03:44:48Z mrglavas $
*/
final class ShortHandPointer implements XPointerPart {
// The name of the ShortHand pointer
private String fShortHandPointer;
// The name of the ShortHand pointer
private boolean fIsFragmentResolved = false;
// SymbolTable
private SymbolTable fSymbolTable;
//
// Constructors
//
public ShortHandPointer() {
}
public ShortHandPointer(SymbolTable symbolTable) {
fSymbolTable = symbolTable;
}
/**
* The XPointerProcessor takes care of this. Simply set the ShortHand Pointer here.
*
* @see org.apache.xerces.xpointer.XPointerPart#parseXPointer(java.lang.String)
*/
public void parseXPointer(String part) throws XNIException {
fShortHandPointer = part;
// reset fIsFragmentResolved
fIsFragmentResolved = false;
}
/**
* Resolves the XPointer ShortHand pointer based on the rules defined in
* Section 3.2 of the XPointer Framework Recommendation.
* Note that in the current implementation only supports DTD determined ID's.
*
* @see org.apache.xerces.xpointer.XPointerPart#resolveXPointer(org.apache.xerces.xni.QName, org.apache.xerces.xni.XMLAttributes, org.apache.xerces.xni.Augmentations, int event)
*/
int fMatchingChildCount = 0;
public boolean resolveXPointer(QName element, XMLAttributes attributes,
Augmentations augs, int event) throws XNIException {
// reset fIsFragmentResolved
if (fMatchingChildCount == 0) {
fIsFragmentResolved = false;
}
// On startElement or emptyElement, if no matching elements or parent
// elements were found, check for a matching idenfitier.
if (event == XPointerPart.EVENT_ELEMENT_START) {
if (fMatchingChildCount == 0) {
fIsFragmentResolved = hasMatchingIdentifier(element, attributes, augs,
event);
}
if (fIsFragmentResolved) {
fMatchingChildCount++;
}
} else if (event == XPointerPart.EVENT_ELEMENT_EMPTY) {
if (fMatchingChildCount == 0) {
fIsFragmentResolved = hasMatchingIdentifier(element, attributes, augs,
event);
}
}
else {
// On endElement, decrease the matching child count if the child or
// its parent was resolved.
if (fIsFragmentResolved) {
fMatchingChildCount--;
}
}
return fIsFragmentResolved ;
}
/**
*
* @param element
* @param attributes
* @param augs
* @param event
* @return
* @throws XNIException
*/
private boolean hasMatchingIdentifier(QName element,
XMLAttributes attributes, Augmentations augs, int event)
throws XNIException {
String normalizedValue = null;
// The identifiers of an element are determined by the
// ShortHand Pointer as follows:
if (attributes != null) {
for (int i = 0; i < attributes.getLength(); i++) {
// 1. If an element information item has an attribute information item
// among its [attributes] that is a schema-determined ID, then it is
// identified by the value of that attribute information item's
// [schema normalized value] property;
normalizedValue = getSchemaDeterminedID(attributes, i);
if (normalizedValue != null) {
break;
}
// 2. If an element information item has an element information item among
// its [children] that is a schema-determined ID, then it is identified by
// the value of that element information item's [schema normalized value] property;
// ???
normalizedValue = getChildrenSchemaDeterminedID(attributes, i);
if (normalizedValue != null) {
break;
}
// 3. If an element information item has an attribute information item among
// its [attributes] that is a DTD-determined ID, then it is identified by the
// value of that attribute information item's [normalized value] property.
// An attribute information item is a DTD-determined ID if and only if it has
// a [type definition] property whose value is equal to ID.
normalizedValue = getDTDDeterminedID(attributes, i);
if (normalizedValue != null) {
break;
}
// 4. No externally determined ID's
}
}
if (normalizedValue != null
&& normalizedValue.equals(fShortHandPointer)) {
return true;
}
return false;
}
/**
* Rerturns the DTD determine-ID
*
* @param attributes
* @param index
* @return String
* @throws XNIException
*/
public String getDTDDeterminedID(XMLAttributes attributes, int index)
throws XNIException {
if (attributes.getType(index).equals("ID")) {
return attributes.getValue(index);
}
return null;
}
/**
* Returns the schema-determined-ID.
*
*
* @param attributes
* @param index
* @return A String containing the schema-determined ID.
* @throws XNIException
*/
public String getSchemaDeterminedID(XMLAttributes attributes, int index)
throws XNIException {
Augmentations augs = attributes.getAugmentations(index);
AttributePSVI attrPSVI = (AttributePSVI) augs
.getItem(Constants.ATTRIBUTE_PSVI);
if (attrPSVI != null) {
// An element or attribute information item is a schema-determined
// ID if and only if one of the following is true:]
// 1. It has a [member type definition] or [type definition] property
// whose value in turn has [name] equal to ID and [target namespace]
// equal to http://www.w3.org/2001/XMLSchema;
// 2. It has a [base type definition] whose value has that [name] and [target namespace];
// 3. It has a [base type definition] whose value has a [base type definition]
// whose value has that [name] and [target namespace], and so on following
// the [base type definition] property recursively;
XSTypeDefinition typeDef = attrPSVI.getMemberTypeDefinition();
if (typeDef != null) {
typeDef = attrPSVI.getTypeDefinition();
}
//
if (typeDef != null && ((XSSimpleType) typeDef).isIDType()) {
return attrPSVI.getSchemaNormalizedValue();
}
// 4 & 5 NA
}
return null;
}
/**
* Not quite sure how this can be correctly implemented.
*
* @param attributes
* @param index
* @return String - We return null since we currenly do not supprt this.
* @throws XNIException
*/
public String getChildrenSchemaDeterminedID(XMLAttributes attributes,
int index) throws XNIException {
return null;
}
/**
*
* @see org.apache.xerces.xpointer.XPointerPart#isFragmentResolved()
*/
public boolean isFragmentResolved() {
return fIsFragmentResolved;
}
/**
*
* @see org.apache.xerces.xpointer.XPointerPart#isChildFragmentResolved()
*/
public boolean isChildFragmentResolved() {
return fIsFragmentResolved && (fMatchingChildCount > 0);
}
/**
* Returns the name of the ShortHand pointer
*
* @see org.apache.xerces.xpointer.XPointerPart#getSchemeName()
*/
public String getSchemeName() {
return fShortHandPointer;
}
/**
* @see org.apache.xerces.xpointer.XPointerPart#getSchemeData()
*/
public String getSchemeData() {
return null;
}
/**
* @see org.apache.xerces.xpointer.XPointerPart#setSchemeName(java.lang.String)
*/
public void setSchemeName(String schemeName) {
fShortHandPointer = schemeName;
}
/**
* @see org.apache.xerces.xpointer.XPointerPart#setSchemeData(java.lang.String)
*/
public void setSchemeData(String schemeData) {
// NA
}
}