/*
 * The Apache Software License, Version 1.1
 *
 *
 * Copyright (c) 1999 The Apache Software Foundation.  All rights
 * reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. The end-user documentation included with the redistribution,
 *    if any, must include the following acknowledgment:
 *       "This product includes software developed by the
 *        Apache Software Foundation (http://www.apache.org/)."
 *    Alternately, this acknowledgment may appear in the software itself,
 *    if and wherever such third-party acknowledgments normally appear.
 *
 * 4. The names "Xerces" and "Apache Software Foundation" must
 *    not be used to endorse or promote products derived from this
 *    software without prior written permission. For written
 *    permission, please contact apache@apache.org.
 *
 * 5. Products derived from this software may not be called "Apache",
 *    nor may "Apache" appear in their name, without prior written
 *    permission of the Apache Software Foundation.
 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation and was
 * originally based on software copyright (c) 1999, International
 * Business Machines, Inc., http://www.apache.org.  For more
 * information on the Apache Software Foundation, please see
 * <http://www.apache.org/>.
 */

package org.apache.xerces.dom;

import org.w3c.dom.*;

/**
 * Text nodes hold the non-markup, non-Entity content of
 * an Element or Attribute.
 * <P>
 * When a document is first made available to the DOM, there is only
 * one Text object for each block of adjacent plain-text. Users (ie,
 * applications) may create multiple adjacent Texts during editing --
 * see {@link Element#normalize} for discussion.
 * <P>
 * Note that CDATASection is a subclass of Text. This is conceptually
 * valid, since they're really just two different ways of quoting
 * characters when they're written out as part of an XML stream.
 *
 * @version
 * @since  PR-DOM-Level-1-19980818.
 */
public class DeferredTextImpl
    extends TextImpl
    implements DeferredNode {

    //
    // Constants
    //

    /** Serialization version. */
    static final long serialVersionUID = 2310613872100393425L;

    //
    // 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.
     */
    DeferredTextImpl(DeferredDocumentImpl ownerDocument, int nodeIndex) {
        super(ownerDocument, null);

        fNodeIndex = nodeIndex;
        syncData = true;

    } // <init>(DeferredDocumentImpl,int)

    //
    // DeferredNode methods
    //

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

    //
    // Protected methods
    //

    /** Synchronizes the underlying data. */
    protected void synchronizeData() {

        // no need for future synchronizations
        syncData = false;

        // get initial text value
        DeferredDocumentImpl ownerDocument = (DeferredDocumentImpl)this.ownerDocument;
        value = ownerDocument.getNodeValueString(fNodeIndex);

        // revisit: we only normalize text nodes with Elements as parents.
        int parent = -1;
        if (getNodeType() == Node.TEXT_NODE &&
            (parent = ownerDocument.getParentNode(fNodeIndex)) != -1 &&
            ownerDocument.getNodeType(parent) == Node.ELEMENT_NODE) {

            int realNext = ownerDocument.getRealNextSibling(fNodeIndex);
            int type     = ownerDocument.getNodeType(realNext);
            if (realNext != -1 && type == Node.TEXT_NODE) {
                StringBuffer sb = new StringBuffer(value);
                while (realNext != -1 && type == Node.TEXT_NODE) {
                    sb.append(ownerDocument.getNodeValueString(realNext));
                    realNext = ownerDocument.getRealNextSibling(realNext);
                    type = ownerDocument.getNodeType(realNext);
                }
                value = sb.toString();
            }
        }

        // ignorable whitespace
        ignorableWhitespace = ownerDocument.getFirstChild(fNodeIndex) == 1;

    } // synchronizeData()

} // class DeferredTextImpl
