1 /* 2 * $HeadURL: http://svn.apache.org/repos/asf/httpcomponents/httpcore/trunk/module-main/src/main/java/org/apache/http/protocol/DefaultedHttpContext.java $ 3 * $Revision: 654882 $ 4 * $Date: 2008-05-09 09:58:59 -0700 (Fri, 09 May 2008) $ 5 * 6 * ==================================================================== 7 * Licensed to the Apache Software Foundation (ASF) under one 8 * or more contributor license agreements. See the NOTICE file 9 * distributed with this work for additional information 10 * regarding copyright ownership. The ASF licenses this file 11 * to you under the Apache License, Version 2.0 (the 12 * "License"); you may not use this file except in compliance 13 * with the License. You may obtain a copy of the License at 14 * 15 * http://www.apache.org/licenses/LICENSE-2.0 16 * 17 * Unless required by applicable law or agreed to in writing, 18 * software distributed under the License is distributed on an 19 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY 20 * KIND, either express or implied. See the License for the 21 * specific language governing permissions and limitations 22 * under the License. 23 * ==================================================================== 24 * 25 * This software consists of voluntary contributions made by many 26 * individuals on behalf of the Apache Software Foundation. For more 27 * information on the Apache Software Foundation, please see 28 * <http://www.apache.org/>. 29 * 30 */ 31 32 package org.apache.http.protocol; 33 34 /** 35 * {@link HttpContext} implementation that delegates resolution of an attribute 36 * to the given default {@link HttpContext} instance if the attribute is not 37 * present in the local one. The state of the local context can be mutated, 38 * whereas the default context is treated as read-only. 39 * 40 * @author <a href="mailto:oleg at ural.ru">Oleg Kalnichevski</a> 41 * 42 * @version $Revision: 654882 $ 43 */ 44 public final class DefaultedHttpContext implements HttpContext { 45 46 private final HttpContext local; 47 private final HttpContext defaults; 48 49 public DefaultedHttpContext(final HttpContext local, final HttpContext defaults) { 50 super(); 51 if (local == null) { 52 throw new IllegalArgumentException("HTTP context may not be null"); 53 } 54 this.local = local; 55 this.defaults = defaults; 56 } 57 58 public Object getAttribute(final String id) { 59 Object obj = this.local.getAttribute(id); 60 if (obj == null) { 61 return this.defaults.getAttribute(id); 62 } else { 63 return obj; 64 } 65 } 66 67 public Object removeAttribute(final String id) { 68 return this.local.removeAttribute(id); 69 } 70 71 public void setAttribute(final String id, final Object obj) { 72 this.local.setAttribute(id, obj); 73 } 74 75 public HttpContext getDefaults() { 76 return this.defaults; 77 } 78 79 } 80
