/**************************************************************
 *
 * 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.
 *
 *************************************************************/

import com.sun.star.accessibility.*;
import java.util.Vector;

import tools.NameProvider;

/** This singleton class creates nodes for given accessible objects.
*/
class NodeFactory
{
    public synchronized static NodeFactory Instance ()
    {
        if (maInstance == null)
        {
            maInstance = new NodeFactory();
        }
        return maInstance;
    }

    private NodeFactory ()
    {
        mbVerbose = false;

        maContextHandler = new AccessibleContextHandler();
        maTextHandler = new AccessibleTextHandler();
        maEditableTextHandler = new AccessibleEditableTextHandler();
        maComponentHandler = new AccessibleComponentHandler();
        maExtendedComponentHandler = new AccessibleExtendedComponentHandler();
        maActionHandler = new AccessibleActionHandler();
        maImageHandler = new AccessibleImageHandler();
        maTableHandler = new AccessibleTableHandler();
        maCellHandler = new AccessibleCellHandler();
        maHypertextHandler = new AccessibleHypertextHandler();
        maHyperlinkHandler = new AccessibleHyperlinkHandler();
        maSelectionHandler = new AccessibleSelectionHandler();
        maRelationHandler = new AccessibleRelationHandler();
        maTreeHandler = new AccessibleTreeHandler();
        maUNOHandler = new AccessibleUNOHandler();
    }


    /** add default handlers based on the supported interfaces */
    private void addDefaultHandlers (AccTreeNode aNode, XAccessibleContext xContext)
    {
        if (false)
        {
            // Slow but complete version: try each handler type separately.
            aNode.addHandler (maContextHandler.createHandler (xContext));
            aNode.addHandler (maTextHandler.createHandler (xContext));
            aNode.addHandler (maEditableTextHandler.createHandler (xContext));
            aNode.addHandler (maComponentHandler.createHandler (xContext));
            aNode.addHandler (maExtendedComponentHandler.createHandler (xContext));
            aNode.addHandler (maActionHandler.createHandler (xContext));
            aNode.addHandler (maImageHandler.createHandler (xContext));
            aNode.addHandler (maTableHandler.createHandler (xContext));
            aNode.addHandler (maCellHandler.createHandler (xContext));
            aNode.addHandler (maHypertextHandler.createHandler (xContext));
            aNode.addHandler (maHyperlinkHandler.createHandler (xContext));
            aNode.addHandler (maSelectionHandler.createHandler (xContext));
            aNode.addHandler (maRelationHandler.createHandler (xContext));
            aNode.addHandler (maUNOHandler.createHandler (xContext));
            aNode.addHandler (maTreeHandler.createHandler (xContext));
        }
        else
        {
            // Exploit dependencies between interfaces.
            NodeHandler aHandler;
            aNode.addHandler (maContextHandler.createHandler (xContext));

            aHandler = maTextHandler.createHandler (xContext);
            if (aHandler != null)
            {
                aNode.addHandler (aHandler);
                aNode.addHandler (maEditableTextHandler.createHandler (xContext));
                aNode.addHandler (maHypertextHandler.createHandler (xContext));
                aNode.addHandler (maHyperlinkHandler.createHandler (xContext));
            }
            aHandler = maComponentHandler.createHandler (xContext);
            if (aHandler != null)
            {
                aNode.addHandler (aHandler);
                aNode.addHandler (maExtendedComponentHandler.createHandler (xContext));
            }
            aNode.addHandler (maActionHandler.createHandler (xContext));
            aNode.addHandler (maImageHandler.createHandler (xContext));
            aNode.addHandler (maTableHandler.createHandler (xContext));
            aNode.addHandler (maRelationHandler.createHandler (xContext));
            aNode.addHandler (maCellHandler.createHandler (xContext));
            aNode.addHandler (maSelectionHandler.createHandler (xContext));
            aNode.addHandler (maUNOHandler.createHandler (xContext));
            aNode.addHandler (maTreeHandler.createHandler (xContext));
        }
    }

    /** create a node with the default handlers */
    public AccTreeNode createDefaultNode (XAccessible xAccessible, AccessibleTreeNode aParent)
    {
        // default: aObject + aDisplay
        String sDisplay;

        // if we are accessible, we use the context + name instead
        XAccessibleContext xContext = null;
        if (xAccessible != null)
            xContext = xAccessible.getAccessibleContext();
        if (xContext != null)
        {
            sDisplay = xContext.getAccessibleName();
            if (sDisplay.length()==0)
            {
                sDisplay = "<no name> Role: "
                    + NameProvider.getRoleName (
                        xContext.getAccessibleRole());
            }
        }
        else
            sDisplay = new String ("not accessible");


        // create node, and add default handlers
        AccTreeNode aNode = new AccTreeNode (xAccessible, xContext, sDisplay, aParent);
        addDefaultHandlers (aNode, xContext);

        if (aNode == null)
            System.out.println ("createDefaultNode == null");
        return aNode;
    }

    private static NodeFactory maInstance = null;

    private boolean mbVerbose;

    // default handlers
    private NodeHandler maContextHandler = new AccessibleContextHandler();
    private NodeHandler maTextHandler = new AccessibleTextHandler();
    private NodeHandler maEditableTextHandler = new AccessibleEditableTextHandler();
    private NodeHandler maComponentHandler = new AccessibleComponentHandler();
    private NodeHandler maExtendedComponentHandler = new AccessibleExtendedComponentHandler();
    private NodeHandler maActionHandler = new AccessibleActionHandler();
    private NodeHandler maImageHandler = new AccessibleImageHandler();
    private NodeHandler maTableHandler = new AccessibleTableHandler();
    private NodeHandler maCellHandler = new AccessibleCellHandler();
    private NodeHandler maHypertextHandler = new AccessibleHypertextHandler();
    private NodeHandler maHyperlinkHandler = new AccessibleHyperlinkHandler();
    private NodeHandler maSelectionHandler = new AccessibleSelectionHandler();
    private NodeHandler maRelationHandler = new AccessibleRelationHandler();
    private NodeHandler maTreeHandler = new AccessibleTreeHandler();
    private NodeHandler maUNOHandler = new AccessibleUNOHandler();
}