/*
 * This file is part of the LibreOffice project.
 *
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/.
 *
 * This file incorporates work covered by the following license notice:
 *
 *   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 .
 */

import java.util.ArrayList;

import javax.swing.event.TreeModelListener;
import javax.swing.tree.TreeModel;
import javax.swing.tree.TreePath;

public class AccessibilityTreeModelBase
    implements TreeModel
{
    public AccessibilityTreeModelBase ()
    {
        setRoot (null);
        maTMListeners = new ArrayList<TreeModelListener>();
    }

    public synchronized void addTreeModelListener(TreeModelListener l)
    {
        maTMListeners.add(l);
    }

    public synchronized void removeTreeModelListener(TreeModelListener l)
    {
        maTMListeners.remove(l);
    }

    public synchronized int getChildCount(Object aParent)
    {
        return (aParent instanceof AccessibleTreeNode) ?
            ((AccessibleTreeNode)aParent).getChildCount() : 0;
    }

    public synchronized Object getChild (Object aParent, int nIndex)
    {
        Object aChild = null;
        try
        {
            if (aParent != null && aParent instanceof AccessibleTreeNode)
                aChild = ((AccessibleTreeNode)aParent).getChild(nIndex);
            else
                System.out.println ("getChild called for unknown parent node");
        }
        catch (com.sun.star.lang.IndexOutOfBoundsException e)
        {
            aChild = ("no child " + nIndex + " from " + aParent + ": " + e);
        }
        return aChild;
    }

    public synchronized Object getChildNoCreate (Object aParent, int nIndex)
    {
        Object aChild = null;
        try
        {
            if (aParent != null && aParent instanceof AccessibleTreeNode)
                aChild = ((AccessibleTreeNode)aParent).getChildNoCreate(nIndex);
            else
                System.out.println ("getChild called for unknown parent node");
        }
        catch (com.sun.star.lang.IndexOutOfBoundsException e)
        { }
        return aChild;
    }

    /** iterate over all children and look for child */
    public synchronized int getIndexOfChild (Object aParent, Object aChild)
    {
        int nIndex = -1;
        try
        {
            if ((aParent instanceof AccessibleTreeNode) && (aChild instanceof AccessibleTreeNode))
            {
                AccessibleTreeNode aParentNode = (AccessibleTreeNode) aParent;
                AccessibleTreeNode aChildNode = (AccessibleTreeNode) aChild;

                int nChildCount = aParentNode.getChildCount();
                for( int i = 0; i < nChildCount; i++ )
                {
                    if (aChildNode.equals (aParentNode.getChild (i)))
                    {
                        nIndex = i;
                        break;
                    }
                }
            }
        }
        catch (com.sun.star.lang.IndexOutOfBoundsException e)
        {
            // Return -1 by falling through.
        }

        // not found?
        return nIndex;
    }

    public boolean isLeaf (Object aNode)
    {
        return (aNode instanceof AccessibleTreeNode) ?
            ((AccessibleTreeNode)aNode).isLeaf() : true;
    }



    public synchronized Object getRoot()
    {
        return maRoot;
    }

    public void valueForPathChanged(TreePath path, Object newValue)
    { }

    protected synchronized void setRoot (AccessibleTreeNode aRoot)
    {
        maRoot = aRoot;
    }


    // The list of TreeModelListener objects.
    protected ArrayList<TreeModelListener> maTMListeners;

    // The root node of the tree.  Use setRoot to change it.
    private AccessibleTreeNode maRoot = null;
}
