jaxp/src/java.xml/share/classes/com/sun/org/apache/xerces/internal/dom/DeferredEntityImpl.java

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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
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 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
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package com.sun.org.apache.xerces.internal.dom;


/**
 * Entity nodes hold the reference data for an XML Entity -- either
 * parsed or unparsed. The nodeName (inherited from Node) will contain
 * the name (if any) of the Entity. Its data will be contained in the
 * Entity's children, in exactly the structure which an
 * EntityReference to this name will present within the document's
 * body.
 * <P>
 * Note that this object models the actual entity, _not_ the entity
 * declaration or the entity reference.
 * <P>
 * An XML processor may choose to completely expand entities before
 * the structure model is passed to the DOM; in this case, there will
 * be no EntityReferences in the DOM tree.
 * <P>
 * Quoting the 10/01 DOM Proposal,
 * <BLOCKQUOTE>
 * "The DOM Level 1 does not support editing Entity nodes; if a user
 * wants to make changes to the contents of an Entity, every related
 * EntityReference node has to be replaced in the structure model by
 * a clone of the Entity's contents, and then the desired changes
 * must be made to each of those clones instead. All the
 * descendants of an Entity node are readonly."
 * </BLOCKQUOTE>
 * I'm interpreting this as: It is the parser's responsibilty to call
 * the non-DOM operation setReadOnly(true,true) after it constructs
 * the Entity. Since the DOM explicitly decided not to deal with this,
 * _any_ answer will involve a non-DOM operation, and this is the
 * simplest solution.
 *
 * @xerces.internal
 *
 * @since  PR-DOM-Level-1-19980818.
 */
public class DeferredEntityImpl
    extends EntityImpl
    implements DeferredNode {

    //
    // Constants
    //

    /** Serialization version. */
    static final long serialVersionUID = 4760180431078941638L;

    //
    // Data
    //

    /** Node index. */
    protected transient int fNodeIndex;

    //
    // Constructors
    //

    /**
     * This is the deferred constructor. Only the fNodeIndex is given here.
     * All other data, can be requested from the ownerDocument via the index.
     */
    DeferredEntityImpl(DeferredDocumentImpl ownerDocument, int nodeIndex) {
        super(ownerDocument, null);

        fNodeIndex = nodeIndex;
        needsSyncData(true);
        needsSyncChildren(true);

    } // <init>(DeferredDocumentImpl,int)

    //
    // DeferredNode methods
    //

    /** Returns the node index. */
    public int getNodeIndex() {
        return fNodeIndex;
    }

    //
    // Protected methods
    //

    /**
     * Synchronize the entity data. This is special because of the way
     * that the "fast" version stores the information.
     */
    protected void synchronizeData() {

        // no need to sychronize again
        needsSyncData(false);

        // get the node data
        DeferredDocumentImpl ownerDocument =
            (DeferredDocumentImpl)this.ownerDocument;
        name = ownerDocument.getNodeName(fNodeIndex);

        // get the entity data
        publicId    = ownerDocument.getNodeValue(fNodeIndex);
        systemId    = ownerDocument.getNodeURI(fNodeIndex);
        int extraDataIndex = ownerDocument.getNodeExtra(fNodeIndex);
        ownerDocument.getNodeType(extraDataIndex);

        notationName = ownerDocument.getNodeName(extraDataIndex);

        // encoding and version DOM L3
        version     = ownerDocument.getNodeValue(extraDataIndex);
        encoding    = ownerDocument.getNodeURI(extraDataIndex);

        // baseURI, actualEncoding DOM L3
        int extraIndex2 = ownerDocument.getNodeExtra(extraDataIndex);
        baseURI = ownerDocument.getNodeName(extraIndex2);
        inputEncoding = ownerDocument.getNodeValue(extraIndex2);

    } // synchronizeData()

    /** Synchronize the children. */
    protected void synchronizeChildren() {

        // no need to synchronize again
        needsSyncChildren(false);

        isReadOnly(false);
        DeferredDocumentImpl ownerDocument =
            (DeferredDocumentImpl) ownerDocument();
        ownerDocument.synchronizeChildren(this, fNodeIndex);
        setReadOnly(true, true);

    } // synchronizeChildren()

} // class DeferredEntityImpl