001 /*--------------------------------------------------------------------------+ 002 $Id: SimpleTreeNodeHandler.java 26268 2010-02-18 10:44:30Z juergens $ 003 | | 004 | Copyright 2005-2010 Technische Universitaet Muenchen | 005 | | 006 | Licensed under the Apache License, Version 2.0 (the "License"); | 007 | you may not use this file except in compliance with the License. | 008 | You may obtain a copy of the License at | 009 | | 010 | http://www.apache.org/licenses/LICENSE-2.0 | 011 | | 012 | Unless required by applicable law or agreed to in writing, software | 013 | distributed under the License is distributed on an "AS IS" BASIS, | 014 | WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | 015 | See the License for the specific language governing permissions and | 016 | limitations under the License. | 017 +--------------------------------------------------------------------------*/ 018 package edu.tum.cs.commons.tree; 019 020 /** 021 * Handler for {@link SimpleTreeNode}. 022 * 023 * @author deissenb 024 * @author $Author: juergens $ 025 * @version $Rev: 26268 $ 026 * @levd.rating GREEN Hash: EAE7ADE3588C81DB8F6FEBF4403F0C91 027 */ 028 public class SimpleTreeNodeHandler<K> implements 029 ITreeNodeHandler<SimpleTreeNode<K>, K> { 030 031 /** The key used for the root. */ 032 private final K rootKey; 033 034 /** 035 * Create new handler. 036 * 037 * @param rootKey 038 * the key used for the root node. 039 */ 040 public SimpleTreeNodeHandler(K rootKey) { 041 this.rootKey = rootKey; 042 } 043 044 /** {@inheritDoc} */ 045 public SimpleTreeNode<K> createRoot() { 046 return new SimpleTreeNode<K>(rootKey); 047 } 048 049 /** {@inheritDoc} */ 050 public SimpleTreeNode<K> getOrCreateChild(SimpleTreeNode<K> node, K key) { 051 SimpleTreeNode<K> child = node.getChild(key); 052 if (child != null) { 053 return child; 054 } 055 056 child = new SimpleTreeNode<K>(key); 057 node.addChild(child); 058 return child; 059 } 060 061 }