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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.
/*
* 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;
import org.apache.xerces.impl.dv.xs.SchemaDVFactoryImpl;
import org.apache.xerces.impl.dv.xs.XSSimpleTypeDecl;
/**
* This class is pool that enables caching of XML Schema declaration objects.
* Before a compiled grammar object is garbage collected,
* the implementation will add all XML Schema component
* declarations to the pool.
* Note: The cashing mechanism is not implemented yet.
*
* @xerces.internal
*
* @author Elena Litani, IBM
* @version $Id: XSDeclarationPool.java 805582 2009-08-18 21:13:20Z sandygao $
*/
public final class XSDeclarationPool {
/** Chunk shift (8). */
private static final int CHUNK_SHIFT = 8; // 2^8 = 256
/** Chunk size (1 << CHUNK_SHIFT). */
private static final int CHUNK_SIZE = 1 << CHUNK_SHIFT;
/** Chunk mask (CHUNK_SIZE - 1). */
private static final int CHUNK_MASK = CHUNK_SIZE - 1;
/** Initial chunk count (). */
private static final int INITIAL_CHUNK_COUNT = (1 << (10 - CHUNK_SHIFT)); // 2^10 = 1k
/** Element declaration pool*/
private XSElementDecl fElementDecl[][] = new XSElementDecl[INITIAL_CHUNK_COUNT][];
private int fElementDeclIndex = 0;
/** Particle declaration pool */
private XSParticleDecl fParticleDecl[][] = new XSParticleDecl[INITIAL_CHUNK_COUNT][];
private int fParticleDeclIndex = 0;
/** Particle declaration pool */
private XSModelGroupImpl fModelGroup[][] = new XSModelGroupImpl[INITIAL_CHUNK_COUNT][];
private int fModelGroupIndex = 0;
/** Attribute declaration pool */
private XSAttributeDecl fAttrDecl[][] = new XSAttributeDecl[INITIAL_CHUNK_COUNT][];
private int fAttrDeclIndex = 0;
/** ComplexType declaration pool */
private XSComplexTypeDecl fCTDecl[][] = new XSComplexTypeDecl[INITIAL_CHUNK_COUNT][];
private int fCTDeclIndex = 0;
/** SimpleType declaration pool */
private XSSimpleTypeDecl fSTDecl[][] = new XSSimpleTypeDecl[INITIAL_CHUNK_COUNT][];
private int fSTDeclIndex = 0;
/** AttributeUse declaration pool */
private XSAttributeUseImpl fAttributeUse[][] = new XSAttributeUseImpl[INITIAL_CHUNK_COUNT][];
private int fAttributeUseIndex = 0;
private SchemaDVFactoryImpl dvFactory;
public void setDVFactory(SchemaDVFactoryImpl dvFactory) {
this.dvFactory = dvFactory;
}
public final XSElementDecl getElementDecl(){
int chunk = fElementDeclIndex >> CHUNK_SHIFT;
int index = fElementDeclIndex & CHUNK_MASK;
ensureElementDeclCapacity(chunk);
if (fElementDecl[chunk][index] == null) {
fElementDecl[chunk][index] = new XSElementDecl();
} else {
fElementDecl[chunk][index].reset();
}
fElementDeclIndex++;
return fElementDecl[chunk][index];
}
public final XSAttributeDecl getAttributeDecl(){
int chunk = fAttrDeclIndex >> CHUNK_SHIFT;
int index = fAttrDeclIndex & CHUNK_MASK;
ensureAttrDeclCapacity(chunk);
if (fAttrDecl[chunk][index] == null) {
fAttrDecl[chunk][index] = new XSAttributeDecl();
} else {
fAttrDecl[chunk][index].reset();
}
fAttrDeclIndex++;
return fAttrDecl[chunk][index];
}
public final XSAttributeUseImpl getAttributeUse(){
int chunk = fAttributeUseIndex >> CHUNK_SHIFT;
int index = fAttributeUseIndex & CHUNK_MASK;
ensureAttributeUseCapacity(chunk);
if (fAttributeUse[chunk][index] == null) {
fAttributeUse[chunk][index] = new XSAttributeUseImpl();
} else {
fAttributeUse[chunk][index].reset();
}
fAttributeUseIndex++;
return fAttributeUse[chunk][index];
}
public final XSComplexTypeDecl getComplexTypeDecl(){
int chunk = fCTDeclIndex >> CHUNK_SHIFT;
int index = fCTDeclIndex & CHUNK_MASK;
ensureCTDeclCapacity(chunk);
if (fCTDecl[chunk][index] == null) {
fCTDecl[chunk][index] = new XSComplexTypeDecl();
} else {
fCTDecl[chunk][index].reset();
}
fCTDeclIndex++;
return fCTDecl[chunk][index];
}
public final XSSimpleTypeDecl getSimpleTypeDecl(){
int chunk = fSTDeclIndex >> CHUNK_SHIFT;
int index = fSTDeclIndex & CHUNK_MASK;
ensureSTDeclCapacity(chunk);
if (fSTDecl[chunk][index] == null) {
fSTDecl[chunk][index] = dvFactory.newXSSimpleTypeDecl();
} else {
fSTDecl[chunk][index].reset();
}
fSTDeclIndex++;
return fSTDecl[chunk][index];
}
public final XSParticleDecl getParticleDecl(){
int chunk = fParticleDeclIndex >> CHUNK_SHIFT;
int index = fParticleDeclIndex & CHUNK_MASK;
ensureParticleDeclCapacity(chunk);
if (fParticleDecl[chunk][index] == null) {
fParticleDecl[chunk][index] = new XSParticleDecl();
} else {
fParticleDecl[chunk][index].reset();
}
fParticleDeclIndex++;
return fParticleDecl[chunk][index];
}
public final XSModelGroupImpl getModelGroup(){
int chunk = fModelGroupIndex >> CHUNK_SHIFT;
int index = fModelGroupIndex & CHUNK_MASK;
ensureModelGroupCapacity(chunk);
if (fModelGroup[chunk][index] == null) {
fModelGroup[chunk][index] = new XSModelGroupImpl();
} else {
fModelGroup[chunk][index].reset();
}
fModelGroupIndex++;
return fModelGroup[chunk][index];
}
// REVISIT: do we need decl pool for group declarations, attribute group,
// notations?
// it seems like each schema would use a small number of those
// components, so it probably is not worth keeping those components
// in the pool.
private boolean ensureElementDeclCapacity(int chunk) {
if (chunk >= fElementDecl.length) {
fElementDecl = resize(fElementDecl, fElementDecl.length * 2);
} else if (fElementDecl[chunk] != null) {
return false;
}
fElementDecl[chunk] = new XSElementDecl[CHUNK_SIZE];
return true;
}
private static XSElementDecl[][] resize(XSElementDecl array[][], int newsize) {
XSElementDecl newarray[][] = new XSElementDecl[newsize][];
System.arraycopy(array, 0, newarray, 0, array.length);
return newarray;
}
private boolean ensureParticleDeclCapacity(int chunk) {
if (chunk >= fParticleDecl.length) {
fParticleDecl = resize(fParticleDecl, fParticleDecl.length * 2);
} else if (fParticleDecl[chunk] != null) {
return false;
}
fParticleDecl[chunk] = new XSParticleDecl[CHUNK_SIZE];
return true;
}
private boolean ensureModelGroupCapacity(int chunk) {
if (chunk >= fModelGroup.length) {
fModelGroup = resize(fModelGroup, fModelGroup.length * 2);
} else if (fModelGroup[chunk] != null) {
return false;
}
fModelGroup[chunk] = new XSModelGroupImpl[CHUNK_SIZE];
return true;
}
private static XSParticleDecl[][] resize(XSParticleDecl array[][], int newsize) {
XSParticleDecl newarray[][] = new XSParticleDecl[newsize][];
System.arraycopy(array, 0, newarray, 0, array.length);
return newarray;
}
private static XSModelGroupImpl[][] resize(XSModelGroupImpl array[][], int newsize) {
XSModelGroupImpl newarray[][] = new XSModelGroupImpl[newsize][];
System.arraycopy(array, 0, newarray, 0, array.length);
return newarray;
}
private boolean ensureAttrDeclCapacity(int chunk) {
if (chunk >= fAttrDecl.length) {
fAttrDecl = resize(fAttrDecl, fAttrDecl.length * 2);
} else if (fAttrDecl[chunk] != null) {
return false;
}
fAttrDecl[chunk] = new XSAttributeDecl[CHUNK_SIZE];
return true;
}
private static XSAttributeDecl[][] resize(XSAttributeDecl array[][], int newsize) {
XSAttributeDecl newarray[][] = new XSAttributeDecl[newsize][];
System.arraycopy(array, 0, newarray, 0, array.length);
return newarray;
}
private boolean ensureAttributeUseCapacity(int chunk) {
if (chunk >= fAttributeUse.length) {
fAttributeUse = resize(fAttributeUse, fAttributeUse.length * 2);
} else if (fAttributeUse[chunk] != null) {
return false;
}
fAttributeUse[chunk] = new XSAttributeUseImpl[CHUNK_SIZE];
return true;
}
private static XSAttributeUseImpl[][] resize(XSAttributeUseImpl array[][], int newsize) {
XSAttributeUseImpl newarray[][] = new XSAttributeUseImpl[newsize][];
System.arraycopy(array, 0, newarray, 0, array.length);
return newarray;
}
private boolean ensureSTDeclCapacity(int chunk) {
if (chunk >= fSTDecl.length) {
fSTDecl = resize(fSTDecl, fSTDecl.length * 2);
} else if (fSTDecl[chunk] != null) {
return false;
}
fSTDecl[chunk] = new XSSimpleTypeDecl[CHUNK_SIZE];
return true;
}
private static XSSimpleTypeDecl[][] resize(XSSimpleTypeDecl array[][], int newsize) {
XSSimpleTypeDecl newarray[][] = new XSSimpleTypeDecl[newsize][];
System.arraycopy(array, 0, newarray, 0, array.length);
return newarray;
}
private boolean ensureCTDeclCapacity(int chunk) {
if (chunk >= fCTDecl.length) {
fCTDecl = resize(fCTDecl, fCTDecl.length * 2);
} else if (fCTDecl[chunk] != null){
return false;
}
fCTDecl[chunk] = new XSComplexTypeDecl[CHUNK_SIZE];
return true;
}
private static XSComplexTypeDecl[][] resize(XSComplexTypeDecl array[][], int newsize) {
XSComplexTypeDecl newarray[][] = new XSComplexTypeDecl[newsize][];
System.arraycopy(array, 0, newarray, 0, array.length);
return newarray;
}
public void reset(){
fElementDeclIndex = 0;
fParticleDeclIndex = 0;
fModelGroupIndex = 0;
fSTDeclIndex = 0;
fCTDeclIndex = 0;
fAttrDeclIndex = 0;
fAttributeUseIndex = 0;
}
}