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JSF components and utilities that can be used with any JSF implementation. This library is compatible with both JSF1.1 and JSF1.2; however for JSF1.2 users there is an alternative build of Tomahawk available that takes advantage of JSF1.2 features to offer some additional benefits.

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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();
}