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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.impl.dtd;
import org.apache.xerces.util.SymbolTable;
import org.apache.xerces.xni.Augmentations;
import org.apache.xerces.xni.XMLDTDContentModelHandler;
import org.apache.xerces.xni.XNIException;
/**
* A DTD grammar that produces balanced syntax trees.
*
* @xerces.internal
*
* @author Michael Glavassevich, IBM
* @version $Id: BalancedDTDGrammar.java 965320 2010-07-18 23:25:54Z mrglavas $
*/
final class BalancedDTDGrammar extends DTDGrammar {
//
// Data
//
/** Mixed. */
private boolean fMixed;
/** Stack depth */
private int fDepth = 0;
/** Children content model operation stack. */
private short [] fOpStack = null;
/** Holder for choice/sequence/leaf groups at each depth. */
private int [][] fGroupIndexStack;
/** Sizes of the allocated portions of each int[] in fGroupIndexStack. */
private int [] fGroupIndexStackSizes;
//
// Constructors
//
/** Default constructor. */
public BalancedDTDGrammar(SymbolTable symbolTable, XMLDTDDescription desc) {
super(symbolTable, desc);
} // BalancedDTDGrammar(SymbolTable,XMLDTDDescription)
//
// Public methods
//
/**
* The start of a content model. Depending on the type of the content
* model, specific methods may be called between the call to the
* startContentModel method and the call to the endContentModel method.
*
* @param elementName The name of the element.
* @param augs Additional information that may include infoset
* augmentations.
* @throws XNIException Thrown by handler to signal an error.
*/
public final void startContentModel(String elementName, Augmentations augs)
throws XNIException {
fDepth = 0;
initializeContentModelStacks();
super.startContentModel(elementName, augs);
} // startContentModel(String)
/**
* A start of either a mixed or children content model. A mixed
* content model will immediately be followed by a call to the
* pcdata() method. A children content model will
* contain additional groups and/or elements.
*
* @param augs Additional information that may include infoset
* augmentations.
* @throws XNIException Thrown by handler to signal an error.
*
* @see #any
* @see #empty
*/
public final void startGroup(Augmentations augs) throws XNIException {
++fDepth;
initializeContentModelStacks();
fMixed = false;
} // startGroup()
/**
* The appearance of "#PCDATA" within a group signifying a
* mixed content model. This method will be the first called
* following the content model's startGroup().
*
*@param augs Additional information that may include infoset
* augmentations.
*
* @throws XNIException Thrown by handler to signal an error.
*
* @see #startGroup
*/
public final void pcdata(Augmentations augs) throws XNIException {
fMixed = true;
} // pcdata()
/**
* A referenced element in a mixed or children content model.
*
* @param elementName The name of the referenced element.
* @param augs Additional information that may include infoset
* augmentations.
*
* @throws XNIException Thrown by handler to signal an error.
*/
public final void element(String elementName, Augmentations augs) throws XNIException {
addToCurrentGroup(addUniqueLeafNode(elementName));
} // element(String)
/**
* The separator between choices or sequences of a mixed or children
* content model.
*
* @param separator The type of children separator.
* @param augs Additional information that may include infoset
* augmentations.
* @throws XNIException Thrown by handler to signal an error.
*
* @see org.apache.xerces.xni.XMLDTDContentModelHandler#SEPARATOR_CHOICE
* @see org.apache.xerces.xni.XMLDTDContentModelHandler#SEPARATOR_SEQUENCE
*/
public final void separator(short separator, Augmentations augs) throws XNIException {
if (separator == XMLDTDContentModelHandler.SEPARATOR_CHOICE) {
fOpStack[fDepth] = XMLContentSpec.CONTENTSPECNODE_CHOICE;
}
else if (separator == XMLDTDContentModelHandler.SEPARATOR_SEQUENCE) {
fOpStack[fDepth] = XMLContentSpec.CONTENTSPECNODE_SEQ;
}
} // separator(short)
/**
* The occurrence count for a child in a children content model or
* for the mixed content model group.
*
* @param occurrence The occurrence count for the last element
* or group.
* @param augs Additional information that may include infoset
* augmentations.
* @throws XNIException Thrown by handler to signal an error.
*
* @see org.apache.xerces.xni.XMLDTDContentModelHandler#OCCURS_ZERO_OR_ONE
* @see org.apache.xerces.xni.XMLDTDContentModelHandler#OCCURS_ZERO_OR_MORE
* @see org.apache.xerces.xni.XMLDTDContentModelHandler#OCCURS_ONE_OR_MORE
*/
public final void occurrence(short occurrence, Augmentations augs) throws XNIException {
if (!fMixed) {
int currentIndex = fGroupIndexStackSizes[fDepth] - 1;
if (occurrence == XMLDTDContentModelHandler.OCCURS_ZERO_OR_ONE) {
fGroupIndexStack[fDepth][currentIndex] = addContentSpecNode(XMLContentSpec.CONTENTSPECNODE_ZERO_OR_ONE, fGroupIndexStack[fDepth][currentIndex], -1);
}
else if ( occurrence == XMLDTDContentModelHandler.OCCURS_ZERO_OR_MORE) {
fGroupIndexStack[fDepth][currentIndex] = addContentSpecNode(XMLContentSpec.CONTENTSPECNODE_ZERO_OR_MORE, fGroupIndexStack[fDepth][currentIndex], -1);
}
else if ( occurrence == XMLDTDContentModelHandler.OCCURS_ONE_OR_MORE) {
fGroupIndexStack[fDepth][currentIndex] = addContentSpecNode(XMLContentSpec.CONTENTSPECNODE_ONE_OR_MORE, fGroupIndexStack[fDepth][currentIndex], -1);
}
}
} // occurrence(short)
/**
* The end of a group for mixed or children content models.
*
* @param augs Additional information that may include infoset
* augmentations.
* @throws XNIException Thrown by handler to signal an error.
*/
public final void endGroup(Augmentations augs) throws XNIException {
final int length = fGroupIndexStackSizes[fDepth];
final int group = length > 0 ? addContentSpecNodes(0, length - 1) : addUniqueLeafNode(null);
--fDepth;
addToCurrentGroup(group);
} // endGroup()
/**
* The end of the DTD.
*
* @param augs Additional information that may include infoset
* augmentations.
* @throws XNIException Thrown by handler to signal an error.
*/
public final void endDTD(Augmentations augs) throws XNIException {
super.endDTD(augs);
fOpStack = null;
fGroupIndexStack = null;
fGroupIndexStackSizes = null;
} // endDTD()
//
// Protected methods
//
/**
* Adds the content spec to the given element declaration.
*/
protected final void addContentSpecToElement(XMLElementDecl elementDecl) {
int contentSpec = fGroupIndexStackSizes[0] > 0 ? fGroupIndexStack[0][0] : -1;
setContentSpecIndex(fCurrentElementIndex, contentSpec);
}
//
// Private methods
//
/**
* Creates a subtree from the leaf nodes at the current depth.
*/
private int addContentSpecNodes(int begin, int end) {
if (begin == end) {
return fGroupIndexStack[fDepth][begin];
}
final int middle = (begin + end) >>> 1;
return addContentSpecNode(fOpStack[fDepth],
addContentSpecNodes(begin, middle),
addContentSpecNodes(middle + 1, end));
} // addContentSpecNodes(int,int)
/**
* Initialize the stacks which temporarily hold content models.
*/
private void initializeContentModelStacks() {
if (fOpStack == null) {
fOpStack = new short[8];
fGroupIndexStack = new int [8][];
fGroupIndexStackSizes = new int [8];
}
else if (fDepth == fOpStack.length) {
short [] newOpStack = new short[fDepth * 2];
System.arraycopy(fOpStack, 0, newOpStack, 0, fDepth);
fOpStack = newOpStack;
int [][] newGroupIndexStack = new int[fDepth * 2][];
System.arraycopy(fGroupIndexStack, 0, newGroupIndexStack, 0, fDepth);
fGroupIndexStack = newGroupIndexStack;
int [] newGroupIndexStackLengths = new int[fDepth * 2];
System.arraycopy(fGroupIndexStackSizes, 0, newGroupIndexStackLengths, 0, fDepth);
fGroupIndexStackSizes = newGroupIndexStackLengths;
}
fOpStack[fDepth] = -1;
fGroupIndexStackSizes[fDepth] = 0;
} // initializeContentModelStacks()
/**
* Add XMLContentSpec to the current group.
*
* @param contentSpec handle to the XMLContentSpec to add to the current group
*/
private void addToCurrentGroup(int contentSpec) {
int [] currentGroup = fGroupIndexStack[fDepth];
int length = fGroupIndexStackSizes[fDepth]++;
if (currentGroup == null) {
currentGroup = new int[8];
fGroupIndexStack[fDepth] = currentGroup;
}
else if (length == currentGroup.length) {
int [] newGroup = new int[currentGroup.length * 2];
System.arraycopy(currentGroup, 0, newGroup, 0, currentGroup.length);
currentGroup = newGroup;
fGroupIndexStack[fDepth] = currentGroup;
}
currentGroup[length] = contentSpec;
} // addToCurrentGroup(int)
} // class BalancedDTDGrammar