1 /* 2 * $Id: ContextWrapper.java 471754 2006-11-06 14:55:09Z husted $ 3 * 4 * Licensed to the Apache Software Foundation (ASF) under one 5 * or more contributor license agreements. See the NOTICE file 6 * distributed with this work for additional information 7 * regarding copyright ownership. The ASF licenses this file 8 * to you under the Apache License, Version 2.0 (the 9 * "License"); you may not use this file except in compliance 10 * with the License. You may obtain a copy of the License at 11 * 12 * http://www.apache.org/licenses/LICENSE-2.0 13 * 14 * Unless required by applicable law or agreed to in writing, 15 * software distributed under the License is distributed on an 16 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY 17 * KIND, either express or implied. See the License for the 18 * specific language governing permissions and limitations 19 * under the License. 20 */ 21 package org.apache.struts.chain.contexts; 22 23 import org.apache.commons.chain.Context; 24 25 import java.util.Collection; 26 import java.util.Map; 27 import java.util.Set; 28 29 /** 30 * <p> Provide a base class for any Context Implementation which is primarily 31 * intended for use in a subchain. </p> <p> Classes which extend 32 * <code>ContextWrapper</code> may implement typesafe property methods which 33 * also leave their values in the underlying context. </p> 34 */ 35 public class ContextWrapper implements Context { 36 private Context base; 37 38 /** 39 * <p> Instantiate object as a composite around the given Context. </p> 40 * 41 * @param context Context instance to wrap 42 */ 43 public ContextWrapper(Context context) { 44 this.base = context; 45 } 46 47 /** 48 * Provide the underlying Context for this composite. 49 * 50 * @return The undelrying Context 51 */ 52 protected Context getBaseContext() { 53 return this.base; 54 } 55 56 // ------------------------------- 57 // Map interface methods 58 // ------------------------------- 59 public Set entrySet() { 60 return this.base.entrySet(); 61 } 62 63 public Set keySet() { 64 return this.base.keySet(); 65 } 66 67 public Collection values() { 68 return this.base.values(); 69 } 70 71 public void clear() { 72 this.base.clear(); 73 } 74 75 public void putAll(Map map) { 76 // ISSUE: Should we check this call to putAll? 77 this.base.putAll(map); 78 } 79 80 public Object remove(Object key) { 81 return this.base.remove(key); 82 } 83 84 public Object put(Object key, Object value) { 85 // ISSUE: Should we check this call to put? 86 return this.base.put(key, value); 87 } 88 89 public Object get(Object key) { 90 return this.base.get(key); 91 } 92 93 public boolean containsValue(Object o) { 94 return this.base.containsValue(o); 95 } 96 97 public boolean containsKey(Object o) { 98 return this.base.containsKey(o); 99 } 100 101 public boolean isEmpty() { 102 return this.base.isEmpty(); 103 } 104 105 public int size() { 106 return this.base.size(); 107 } 108 }