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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.
/*
* 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.xs.traversers;
import org.apache.xerces.impl.xs.SchemaGrammar;
import org.apache.xerces.impl.xs.SchemaSymbols;
import org.apache.xerces.impl.xs.XSAnnotationImpl;
import org.apache.xerces.impl.xs.XSModelGroupImpl;
import org.apache.xerces.impl.xs.XSParticleDecl;
import org.apache.xerces.impl.xs.util.XInt;
import org.apache.xerces.impl.xs.util.XSObjectListImpl;
import org.apache.xerces.util.DOMUtil;
import org.apache.xerces.xs.XSObject;
import org.apache.xerces.xs.XSObjectList;
import org.w3c.dom.Element;
/**
* @xerces.internal
*
* @author Elena Litani, IBM
* @author Sandy Gao, IBM
* @version $Id: XSDAbstractParticleTraverser.java 725840 2008-12-11 22:19:06Z mrglavas $
*/
abstract class XSDAbstractParticleTraverser extends XSDAbstractTraverser {
XSDAbstractParticleTraverser (XSDHandler handler,
XSAttributeChecker gAttrCheck) {
super(handler, gAttrCheck);
}
/**
*
* Traverse the "All" declaration
*
* <all
* id = ID
* maxOccurs = 1 : 1
* minOccurs = (0 | 1) : 1>
* Content: (annotation? , element*)
* </all>
**/
XSParticleDecl traverseAll(Element allDecl,
XSDocumentInfo schemaDoc,
SchemaGrammar grammar,
int allContextFlags,
XSObject parent) {
// General Attribute Checking
Object[] attrValues = fAttrChecker.checkAttributes(allDecl, false, schemaDoc);
Element child = DOMUtil.getFirstChildElement(allDecl);
XSAnnotationImpl annotation = null;
if (child !=null && DOMUtil.getLocalName(child).equals(SchemaSymbols.ELT_ANNOTATION)) {
annotation = traverseAnnotationDecl(child, attrValues, false, schemaDoc);
child = DOMUtil.getNextSiblingElement(child);
}
else {
String text = DOMUtil.getSyntheticAnnotation(allDecl);
if (text != null) {
annotation = traverseSyntheticAnnotation(allDecl, text, attrValues, false, schemaDoc);
}
}
String childName = null;
XSParticleDecl particle;
fPArray.pushContext();
for (; child != null; child = DOMUtil.getNextSiblingElement(child)) {
particle = null;
childName = DOMUtil.getLocalName(child);
// Only elements are allowed in
if (childName.equals(SchemaSymbols.ELT_ELEMENT)) {
particle = fSchemaHandler.fElementTraverser.traverseLocal(child, schemaDoc, grammar, PROCESSING_ALL_EL, parent);
}
else {
Object[] args = {"all", "(annotation?, element*)", DOMUtil.getLocalName(child)};
reportSchemaError("s4s-elt-must-match.1", args, child);
}
if (particle != null)
fPArray.addParticle(particle);
}
particle = null;
XInt minAtt = (XInt)attrValues[XSAttributeChecker.ATTIDX_MINOCCURS];
XInt maxAtt = (XInt)attrValues[XSAttributeChecker.ATTIDX_MAXOCCURS];
Long defaultVals = (Long)attrValues[XSAttributeChecker.ATTIDX_FROMDEFAULT];
XSModelGroupImpl group = new XSModelGroupImpl();
group.fCompositor = XSModelGroupImpl.MODELGROUP_ALL;
group.fParticleCount = fPArray.getParticleCount();
group.fParticles = fPArray.popContext();
XSObjectList annotations;
if (annotation != null) {
annotations = new XSObjectListImpl();
((XSObjectListImpl)annotations).addXSObject (annotation);
} else {
annotations = XSObjectListImpl.EMPTY_LIST;
}
group.fAnnotations = annotations;
particle = new XSParticleDecl();
particle.fType = XSParticleDecl.PARTICLE_MODELGROUP;
particle.fMinOccurs = minAtt.intValue();
particle.fMaxOccurs = maxAtt.intValue();
particle.fValue = group;
particle.fAnnotations = annotations;
particle = checkOccurrences(particle,
SchemaSymbols.ELT_ALL,
(Element)allDecl.getParentNode(),
allContextFlags,
defaultVals.longValue());
fAttrChecker.returnAttrArray(attrValues, schemaDoc);
return particle;
}
/**
* Traverse the Sequence declaration
*
*
* Content: (annotation? , (element | group | choice | sequence | any)*)
*
*
* @param seqDecl
* @param schemaDoc
* @param grammar
* @return
*/
XSParticleDecl traverseSequence(Element seqDecl,
XSDocumentInfo schemaDoc,
SchemaGrammar grammar,
int allContextFlags,
XSObject parent) {
return traverseSeqChoice(seqDecl, schemaDoc, grammar, allContextFlags, false, parent);
}
/**
* Traverse the Choice declaration
*
*
* Content: (annotation? , (element | group | choice | sequence | any)*)
*
*
* @param choiceDecl
* @param schemaDoc
* @param grammar
* @return
*/
XSParticleDecl traverseChoice(Element choiceDecl,
XSDocumentInfo schemaDoc,
SchemaGrammar grammar,
int allContextFlags,
XSObject parent) {
return traverseSeqChoice (choiceDecl, schemaDoc, grammar, allContextFlags, true, parent);
}
/**
* Common traversal for and
*
* @param decl
* @param schemaDoc
* @param grammar
* @param choice If traversing this parameter is true.
* @return
*/
private XSParticleDecl traverseSeqChoice(Element decl,
XSDocumentInfo schemaDoc,
SchemaGrammar grammar,
int allContextFlags,
boolean choice,
XSObject parent) {
// General Attribute Checking
Object[] attrValues = fAttrChecker.checkAttributes(decl, false, schemaDoc);
Element child = DOMUtil.getFirstChildElement(decl);
XSAnnotationImpl annotation = null;
if (child !=null && DOMUtil.getLocalName(child).equals(SchemaSymbols.ELT_ANNOTATION)) {
annotation = traverseAnnotationDecl(child, attrValues, false, schemaDoc);
child = DOMUtil.getNextSiblingElement(child);
}
else {
String text = DOMUtil.getSyntheticAnnotation(decl);
if (text != null) {
annotation = traverseSyntheticAnnotation(decl, text, attrValues, false, schemaDoc);
}
}
String childName = null;
XSParticleDecl particle;
fPArray.pushContext();
for (;child != null;child = DOMUtil.getNextSiblingElement(child)) {
particle = null;
childName = DOMUtil.getLocalName(child);
if (childName.equals(SchemaSymbols.ELT_ELEMENT)) {
particle = fSchemaHandler.fElementTraverser.traverseLocal(child, schemaDoc, grammar, NOT_ALL_CONTEXT, parent);
}
else if (childName.equals(SchemaSymbols.ELT_GROUP)) {
particle = fSchemaHandler.fGroupTraverser.traverseLocal(child, schemaDoc, grammar);
// A content type of all can only appear
// as the content type of a complex type definition.
if (hasAllContent(particle)) {
// don't insert the "all" particle, otherwise we won't be
// able to create DFA from this content model
particle = null;
reportSchemaError("cos-all-limited.1.2", null, child);
}
}
else if (childName.equals(SchemaSymbols.ELT_CHOICE)) {
particle = traverseChoice(child, schemaDoc, grammar, NOT_ALL_CONTEXT, parent);
}
else if (childName.equals(SchemaSymbols.ELT_SEQUENCE)) {
particle = traverseSequence(child, schemaDoc, grammar, NOT_ALL_CONTEXT, parent);
}
else if (childName.equals(SchemaSymbols.ELT_ANY)) {
particle = fSchemaHandler.fWildCardTraverser.traverseAny(child, schemaDoc, grammar);
}
else {
Object [] args;
if (choice) {
args = new Object[]{"choice", "(annotation?, (element | group | choice | sequence | any)*)", DOMUtil.getLocalName(child)};
}
else {
args = new Object[]{"sequence", "(annotation?, (element | group | choice | sequence | any)*)", DOMUtil.getLocalName(child)};
}
reportSchemaError("s4s-elt-must-match.1", args, child);
}
if (particle != null)
fPArray.addParticle(particle);
}
particle = null;
XInt minAtt = (XInt)attrValues[XSAttributeChecker.ATTIDX_MINOCCURS];
XInt maxAtt = (XInt)attrValues[XSAttributeChecker.ATTIDX_MAXOCCURS];
Long defaultVals = (Long)attrValues[XSAttributeChecker.ATTIDX_FROMDEFAULT];
XSModelGroupImpl group = new XSModelGroupImpl();
group.fCompositor = choice ? XSModelGroupImpl.MODELGROUP_CHOICE : XSModelGroupImpl.MODELGROUP_SEQUENCE;
group.fParticleCount = fPArray.getParticleCount();
group.fParticles = fPArray.popContext();
XSObjectList annotations;
if (annotation != null) {
annotations = new XSObjectListImpl();
((XSObjectListImpl)annotations).addXSObject (annotation);
} else {
annotations = XSObjectListImpl.EMPTY_LIST;
}
group.fAnnotations = annotations;
particle = new XSParticleDecl();
particle.fType = XSParticleDecl.PARTICLE_MODELGROUP;
particle.fMinOccurs = minAtt.intValue();
particle.fMaxOccurs = maxAtt.intValue();
particle.fValue = group;
particle.fAnnotations = annotations;
particle = checkOccurrences(particle,
choice ? SchemaSymbols.ELT_CHOICE : SchemaSymbols.ELT_SEQUENCE,
(Element)decl.getParentNode(),
allContextFlags,
defaultVals.longValue());
fAttrChecker.returnAttrArray(attrValues, schemaDoc);
return particle;
}
// Determines whether a content spec tree represents an "all" content model
protected boolean hasAllContent(XSParticleDecl particle) {
// If the content is not empty, is the top node ALL?
if (particle != null && particle.fType == XSParticleDecl.PARTICLE_MODELGROUP) {
return ((XSModelGroupImpl)particle.fValue).fCompositor == XSModelGroupImpl.MODELGROUP_ALL;
}
return false;
}
// the inner class: used to store particles for model groups
// to avoid creating a new Vector in each model group, or when traversing
// each model group, we use this one big array to store all particles
// for model groups. when the traversal finishes, this class returns an
// XSParticleDecl[] containing all particles for the current model group.
// it's possible that we need to traverse another model group while
// traversing one (one inside another one; referring to a global group,
// etc.), so we have push/pos context methods to save the same of the
// current traversal before starting the traversal of another model group.
protected static class ParticleArray {
// big array to contain all particles
XSParticleDecl[] fParticles = new XSParticleDecl[10];
// the ending position of particles in the array for each context
// index 0 is reserved, with value 0. index 1 is used for the fist
// context. so that the number of particles for context 'i' can be
// computed simply by fPos[i] - fPos[i-1].
int[] fPos = new int[5];
// number of contexts
int fContextCount = 0;
// start a new context (start traversing a new model group)
void pushContext() {
fContextCount++;
// resize position array if necessary
if (fContextCount == fPos.length) {
int newSize = fContextCount * 2;
int[] newArray = new int[newSize];
System.arraycopy(fPos, 0, newArray, 0, fContextCount);
fPos = newArray;
}
// the initial ending position of the current context is the
// ending position of the previsous context. which means there is
// no particle for the current context yet.
fPos[fContextCount] = fPos[fContextCount-1];
}
// get the number of particles of this context (model group)
int getParticleCount() {
return fPos[fContextCount] - fPos[fContextCount-1];
}
// add a particle to the current context
void addParticle(XSParticleDecl particle) {
// resize the particle array if necessary
if (fPos[fContextCount] == fParticles.length) {
int newSize = fPos[fContextCount] * 2;
XSParticleDecl[] newArray = new XSParticleDecl[newSize];
System.arraycopy(fParticles, 0, newArray, 0, fPos[fContextCount]);
fParticles = newArray;
}
fParticles[fPos[fContextCount]++] = particle;
}
// end the current context, and return an array of particles
XSParticleDecl[] popContext() {
int count = fPos[fContextCount] - fPos[fContextCount-1];
XSParticleDecl[] array = null;
if (count != 0) {
array = new XSParticleDecl[count];
System.arraycopy(fParticles, fPos[fContextCount-1], array, 0, count);
// clear the particle array, to release memory
for (int i = fPos[fContextCount-1]; i < fPos[fContextCount]; i++)
fParticles[i] = null;
}
fContextCount--;
return array;
}
}
// the big particle array to hold all particles in model groups
ParticleArray fPArray = new ParticleArray();
}
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