001// Copyright 2004, 2005 The Apache Software Foundation
002//
003// Licensed under the Apache License, Version 2.0 (the "License");
004// you may not use this file except in compliance with the License.
005// You may obtain a copy of the License at
006//
007//     http://www.apache.org/licenses/LICENSE-2.0
008//
009// Unless required by applicable law or agreed to in writing, software
010// distributed under the License is distributed on an "AS IS" BASIS,
011// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
012// See the License for the specific language governing permissions and
013// limitations under the License.
014
015package org.apache.tapestry.contrib.tree.model;
016
017import java.io.Serializable;
018import java.util.Collection;
019
020/**
021 * @author ceco
022 */
023
024public interface ITreeNode extends Serializable
025{
026        
027    /**
028     * Returns the <code>Collection</code> of children. 
029     */
030    Collection getChildren();
031
032    /**
033     * Returns the number of children <code>ITreeNode</code>s the receiver
034     * contains.
035     */
036    int getChildCount();
037
038    /**
039     * Returns the parent <code>ITreeNode</code> of the receiver.
040     */
041    ITreeNode getParent();
042
043    /**
044     * Returns the true if current node contains received children, otherwise return false;
045     */
046    boolean containsChild(ITreeNode node);
047
048    /**
049     * Returns true if the receiver allows children.
050     */
051    boolean getAllowsChildren();
052
053    /**
054     * Returns true if the receiver is a leaf.
055     */
056    boolean isLeaf();
057
058}