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JSF components and utilities that can be used with any JSF implementation. This library is based on the JSF1.1 version of Tomahawk, but with minor source code and build changes to take advantage of JSF1.2 features. A JSF1.2 implementation is required to use this version of the Tomahawk library.

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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
 *
 * 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.
 */
package org.apache.myfaces.custom.tree.model;

import java.util.Collection;


/**
 * @author Oliver Rossmueller
 * @version $Revision: 472638 $ $Date: 2006-11-08 15:54:13 -0500 (Wed, 08 Nov 2006) $
 */
public interface TreeModel
{

    /**
     * Return the root of the tree.
     *
     * @return the root of the tree or null, it this tree has no nodes
     */
    public Object getRoot();


    /**
     * Return the child of parent at index index
     * in the parent's child array.
     *
     * @param parent a node in the tree
     * @return the child of parent at index index
     */
    public Object getChild(Object parent, int index);


    /**
     * Answer the number of children of parent.
     *
     * @param parent a node in the tree
     * @return the number of children of the node parent
     */
    public int getChildCount(Object parent);


    /**
     * Answer true if node is a leaf.
     *
     * @param node a node in the tree
     * @return true if node is a leaf
     */
    public boolean isLeaf(Object node);


    /**
     * Called when the value for the item identified
     * by path has changed to newValue.
     * If newValue signifies a truly new value
     * the model should post a treeNodesChanged event.
     *
     * @param path     path to the node that has been altered
     * @param newValue the new value from the TreeCellEditor
     */
    public void valueForPathChanged(TreePath path, Object newValue);


    /**
     * Return the index of child in parent.
     *
     * @param parent a node in the tree
     * @param child  the node we are interested in
     * @return the index of the child in the parent, or -1 if either
     *         child or parent are null
     */
    public int getIndexOfChild(Object parent, Object child);


    /**
     * Answer the mutable collection of tree model listeners.
     *
     * @return Collection
     */
    Collection getTreeModelListeners();
}