deferreddocumentimpl.java

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/*
 * Copyright 1999-2002,2004,2005 The Apache Software Foundation.
 * 
 * Licensed 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 com.sun.org.apache.xerces.internal.dom;

import org.w3c.dom.DOMImplementation;
import org.w3c.dom.Element;
import org.w3c.dom.Node;

import java.util.Vector;

/**
 * The Document interface represents the entire HTML or XML document.
 * Conceptually, it is the root of the document tree, and provides the
 * primary access to the document's data.
 * <P>
 * Since elements, text nodes, comments, processing instructions,
 * etc. cannot exist outside the context of a Document, the Document
 * interface also contains the factory methods needed to create these
 * objects. The Node objects created have a ownerDocument attribute
 * which associates them with the Document within whose context they
 * were created.
 * 
 * @xerces.internal
 *
 * @version $Id: DeferredDocumentImpl.java,v 1.2.6.1 2005/08/31 10:30:07 sunithareddy Exp $
 * @since  PR-DOM-Level-1-19980818.
 */
public class DeferredDocumentImpl
    extends DocumentImpl
    implements DeferredNode {

    //
    // Constants
    //

    /** Serialization version. */
    static final long serialVersionUID = 5186323580749626857L;

    // debugging

    /** To include code for printing the ref count tables. */
    private static final boolean DEBUG_PRINT_REF_COUNTS = false;

    /** To include code for printing the internal tables. */
    private static final boolean DEBUG_PRINT_TABLES = false;

    /** To debug identifiers set to true and recompile. */
    private static final boolean DEBUG_IDS = false;

    // protected

    /** Chunk shift. */
    protected static final int CHUNK_SHIFT = 11;           // 2^11 = 2k

    /** Chunk size. */
    protected static final int CHUNK_SIZE = (1 << CHUNK_SHIFT);

    /** Chunk mask. */
    protected static final int CHUNK_MASK = CHUNK_SIZE - 1;

    /** Initial chunk size. */
    protected static final int INITIAL_CHUNK_COUNT = (1 << (16 - CHUNK_SHIFT));   // 2^16 = 64k

    //
    // Data
    //

    // lazy-eval information
    // To maximize memory consumption the actual semantic of these fields vary
    // depending on the node type.

    /** Node count. */
    protected transient int fNodeCount = 0;

    /** Node types. */
    protected transient int fNodeType[][];

    /** Node names. */
    protected transient Object fNodeName[][];

    /** Node values. */
    protected transient Object fNodeValue[][];

    /** Node parents. */
    protected transient int fNodeParent[][];

    /** Node first children. */
    protected transient int fNodeLastChild[][];

    /** Node prev siblings. */
    protected transient int fNodePrevSib[][];

    /** Node namespace URI. */
    protected transient Object fNodeURI[][];

    /** Extra data. */
    protected transient int fNodeExtra[][];

    /** Identifier count. */
    protected transient int fIdCount;

    /** Identifier name indexes. */
    protected transient String fIdName[];

    /** Identifier element indexes. */
    protected transient int fIdElement[];

    /** DOM2: For namespace support in the deferred case.
     */
    // Implementation Note: The deferred element and attribute must know how to
    // interpret the int representing the qname.
    protected boolean fNamespacesEnabled = false;
    
    //
    // private data
    //
    private transient final StringBuffer fBufferStr = new StringBuffer();
    private transient final Vector fStrChunks = new Vector();

    //
    // Constructors
    //

    /**
     * NON-DOM: Actually creating a Document is outside the DOM's spec,
     * since it has to operate in terms of a particular implementation.
     */
    public DeferredDocumentImpl() {
        this(false);
    } // <init>()

    /**
     * NON-DOM: Actually creating a Document is outside the DOM's spec,
     * since it has to operate in terms of a particular implementation.
     */
    public DeferredDocumentImpl(boolean namespacesEnabled) {
        this(namespacesEnabled, false);
    } // <init>(boolean)

    /** Experimental constructor. */
    public DeferredDocumentImpl(boolean namespaces, boolean grammarAccess) {
        super(grammarAccess);

        needsSyncData(true);
        needsSyncChildren(true);

        fNamespacesEnabled = namespaces;

    } // <init>(boolean,boolean)

    //
    // Public methods
    //

    /**
     * Retrieve information describing the abilities of this particular
     * DOM implementation. Intended to support applications that may be
     * using DOMs retrieved from several different sources, potentially
     * with different underlying representations.
     */
    public DOMImplementation getImplementation() {
        // Currently implemented as a singleton, since it's hardcoded
        // information anyway.
        return DeferredDOMImplementationImpl.getDOMImplementation();
    }
    
    /** Returns the cached parser.getNamespaces() value.*/
    boolean getNamespacesEnabled() {
        return fNamespacesEnabled;
    }

    void setNamespacesEnabled(boolean enable) {
        fNamespacesEnabled = enable;
    }

    // internal factory methods

    /** Creates a document node in the table. */
    public int createDeferredDocument() {
        int nodeIndex = createNode(Node.DOCUMENT_NODE);
        return nodeIndex;
    }

    /** Creates a doctype. */
    public int createDeferredDocumentType(String rootElementName,
                                          String publicId, String systemId) {

        // create node
        int nodeIndex = createNode(Node.DOCUMENT_TYPE_NODE);
        int chunk     = nodeIndex >> CHUNK_SHIFT;
        int index     = nodeIndex & CHUNK_MASK;

        // save name, public id, system id
        setChunkValue(fNodeName, rootElementName, chunk, index);
        setChunkValue(fNodeValue, publicId, chunk, index);
        setChunkValue(fNodeURI, systemId, chunk, index);

        // return node index
        return nodeIndex;

    } // createDeferredDocumentType(String,String,String):int

    public void setInternalSubset(int doctypeIndex, String subset) {
        int chunk     = doctypeIndex >> CHUNK_SHIFT;
        int index     = doctypeIndex & CHUNK_MASK;

        // create extra data node to store internal subset
        int extraDataIndex = createNode(Node.DOCUMENT_TYPE_NODE); 
        int echunk = extraDataIndex >> CHUNK_SHIFT;
        int eindex = extraDataIndex & CHUNK_MASK;
        setChunkIndex(fNodeExtra, extraDataIndex, chunk, index);        
        setChunkValue(fNodeValue, subset, echunk, eindex);
    }

    /** Creates a notation in the table. */
    public int createDeferredNotation(String notationName,
                                      String publicId, String systemId, String baseURI) {

        // create node
        int nodeIndex = createNode(Node.NOTATION_NODE);
        int chunk     = nodeIndex >> CHUNK_SHIFT;
        int index     = nodeIndex & CHUNK_MASK;


        // create extra data node
        int extraDataIndex = createNode(Node.NOTATION_NODE); 
        int echunk = extraDataIndex >> CHUNK_SHIFT;
        int eindex = extraDataIndex & CHUNK_MASK;

        // save name, public id, system id, and notation name
        setChunkValue(fNodeName, notationName, chunk, index);
        setChunkValue(fNodeValue, publicId, chunk, index);
        setChunkValue(fNodeURI, systemId, chunk, index);

        // in extra data node set baseURI value
        setChunkIndex(fNodeExtra, extraDataIndex, chunk, index);
        setChunkValue(fNodeName, baseURI, echunk, eindex);

        // return node index
        return nodeIndex;

    } // createDeferredNotation(String,String,String):int

    /** Creates an entity in the table. */
    public int createDeferredEntity(String entityName, String publicId,
                                    String systemId, String notationName, 
                                    String baseURI) {
        // create node
        int nodeIndex = createNode(Node.ENTITY_NODE);
        int chunk     = nodeIndex >> CHUNK_SHIFT;
        int index     = nodeIndex & CHUNK_MASK;

        // create extra data node
        int extraDataIndex = createNode(Node.ENTITY_NODE); 
        int echunk = extraDataIndex >> CHUNK_SHIFT;
        int eindex = extraDataIndex & CHUNK_MASK;

        // save name, public id, system id, and notation name
        setChunkValue(fNodeName, entityName, chunk, index);
        setChunkValue(fNodeValue, publicId, chunk, index);
        setChunkValue(fNodeURI, systemId, chunk, index);
        setChunkIndex(fNodeExtra, extraDataIndex, chunk, index);
        // set other values in the extra chunk
        // notation
        setChunkValue(fNodeName, notationName, echunk, eindex);
        // version  L3
        setChunkValue(fNodeValue, null, echunk, eindex);
        // encoding L3
        setChunkValue(fNodeURI, null, echunk, eindex);


        int extraDataIndex2 = createNode(Node.ENTITY_NODE);
        int echunk2 = extraDataIndex2 >> CHUNK_SHIFT;
        int eindex2 = extraDataIndex2 & CHUNK_MASK;

        setChunkIndex(fNodeExtra, extraDataIndex2, echunk, eindex);

        // baseURI
        setChunkValue(fNodeName, baseURI, echunk2, eindex2);

        // return node index
        return nodeIndex;

    } // createDeferredEntity(String,String,String,String):int

    public String getDeferredEntityBaseURI (int entityIndex){
        if (entityIndex != -1) {
            int extraDataIndex = getNodeExtra(entityIndex, false);
            extraDataIndex = getNodeExtra(extraDataIndex, false);
            return getNodeName (extraDataIndex, false);
        }
        return null;
    }

    // DOM Level 3: setting encoding and version
    public void setEntityInfo(int currentEntityDecl,
                              String version, String encoding){
        int eNodeIndex = getNodeExtra(currentEntityDecl, false);
        if (eNodeIndex !=-1) {
            int echunk = eNodeIndex >> CHUNK_SHIFT;
            int eindex = eNodeIndex & CHUNK_MASK;
            setChunkValue(fNodeValue, version, echunk, eindex);
            setChunkValue(fNodeURI, encoding, echunk, eindex);
        }
    }


    /**
     * DOM Internal 
     *
     * An attribute specifying the actual encoding of this document. This is
     * <code>null</code> otherwise.
     * <br> This attribute represents the property [character encoding scheme]
     * defined in .
     */
    public void setInputEncoding(int currentEntityDecl, String value){
        // get first extra data chunk
        int nodeIndex = getNodeExtra(currentEntityDecl, false);
        // get second extra data chunk
        int extraDataIndex = getNodeExtra(nodeIndex, false);

        int echunk = extraDataIndex >> CHUNK_SHIFT;
        int eindex = extraDataIndex & CHUNK_MASK;
        
        setChunkValue(fNodeValue, value, echunk, eindex);
        
    }

    /** Creates an entity reference node in the table. */
    public int createDeferredEntityReference(String name, String baseURI) {

        // create node
        int nodeIndex = createNode(Node.ENTITY_REFERENCE_NODE);
        int chunk     = nodeIndex >> CHUNK_SHIFT;
        int index     = nodeIndex & CHUNK_MASK;
        setChunkValue(fNodeName, name, chunk, index);
        setChunkValue(fNodeValue, baseURI, chunk, index);

        // return node index
        return nodeIndex;

    } // createDeferredEntityReference(String):int


    /** Creates an element node with a URI in the table and type information. */
    public int createDeferredElement(String elementURI, String elementName, 
                                      Object type) {

        // create node
        int elementNodeIndex = createNode(Node.ELEMENT_NODE);
        int elementChunk     = elementNodeIndex >> CHUNK_SHIFT;
        int elementIndex     = elementNodeIndex & CHUNK_MASK;