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}