/*
 * 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.
 */

/*
 * WARNING: because java doesn't support multi-inheritance some code is
 * duplicated. If you're changing this file you probably want to change
 * DeferredElementNSImpl.java at the same time.
 */

package org.apache.xerces.dom;

import org.w3c.dom.NamedNodeMap;

/**
 * Elements represent most of the "markup" and structure of the
 * document.  They contain both the data for the element itself
 * (element name and attributes), and any contained nodes, including
 * document text (as children).
 * <P>
 * Elements may have Attributes associated with them; the API for this is
 * defined in Node, but the function is implemented here. In general, XML
 * applications should retrive Attributes as Nodes, since they may contain
 * entity references and hence be a fairly complex sub-tree. HTML users will
 * be dealing with simple string values, and convenience methods are provided
 * to work in terms of Strings.
 * <P>
 * DeferredElementImpl inherits from ElementImpl which does not support
 * Namespaces. DeferredElementNSImpl, which inherits from ElementNSImpl, does.
 * @see DeferredElementNSImpl
 *
 * @xerces.internal
 *
 * @version $Id$
 * @since  PR-DOM-Level-1-19980818.
 */
public class DeferredElementImpl
    extends ElementImpl
    implements DeferredNode {

    //
    // Constants
    //

    /** Serialization version. */
    static final long serialVersionUID = -7670981133940934842L;

    //
    // 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.
     */
    DeferredElementImpl(DeferredDocumentImpl ownerDoc, int nodeIndex) {
        super(ownerDoc, null);

        fNodeIndex = nodeIndex;
        needsSyncChildren(true);

    } // <init>(DocumentImpl,int)

    //
    // DeferredNode methods
    //

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

    //
    // Protected methods
    //

    /** Synchronizes the data (name and value) for fast nodes. */
    protected final void synchronizeData() {

        // no need to sync in the future
        needsSyncData(false);

        // fluff data
        DeferredDocumentImpl ownerDocument =
            (DeferredDocumentImpl)this.ownerDocument;

        // we don't want to generate any event for this so turn them off
        boolean orig = ownerDocument.mutationEvents;
        ownerDocument.mutationEvents = false;

        name = ownerDocument.getNodeName(fNodeIndex);

        // attributes
        setupDefaultAttributes();
        int index = ownerDocument.getNodeExtra(fNodeIndex);
        if (index != -1) {
            NamedNodeMap attrs = getAttributes();
            do {
                NodeImpl attr = (NodeImpl)ownerDocument.getNodeObject(index);
                attrs.setNamedItem(attr);
                index = ownerDocument.getPrevSibling(index);
            } while (index != -1);
        }

        // set mutation events flag back to its original value
        ownerDocument.mutationEvents = orig;

    } // synchronizeData()

    protected final void synchronizeChildren() {
        DeferredDocumentImpl ownerDocument =
            (DeferredDocumentImpl) ownerDocument();
        ownerDocument.synchronizeChildren(this, fNodeIndex);
    } // synchronizeChildren()

} // class DeferredElementImpl
