BasicHttpContext.java revision 069490a5ca2fd1988d29daf45d892f47ad665115 
1/*
2 * $HeadURL: http://svn.apache.org/repos/asf/httpcomponents/httpcore/trunk/module-main/src/main/java/org/apache/http/protocol/BasicHttpContext.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
32package org.apache.http.protocol;
33
34import java.util.HashMap;
35import java.util.Map;
36
37/**
38 * Default implementation of the {@link HttpContext HttpContext}.
39 *
40 * @author <a href="mailto:oleg at ural.ru">Oleg Kalnichevski</a>
41 *
42 * @version $Revision: 654882 $
43 *
44 * @since 4.0
45 */
46public class BasicHttpContext implements HttpContext {
47
48    private final HttpContext parentContext;
49    private Map map = null;
50
51    public BasicHttpContext() {
52        this(null);
53    }
54
55    public BasicHttpContext(final HttpContext parentContext) {
56        super();
57        this.parentContext = parentContext;
58    }
59
60    public Object getAttribute(final String id) {
61        if (id == null) {
62            throw new IllegalArgumentException("Id may not be null");
63        }
64        Object obj = null;
65        if (this.map != null) {
66            obj = this.map.get(id);
67        }
68        if (obj == null && this.parentContext != null) {
69            obj = this.parentContext.getAttribute(id);
70        }
71        return obj;
72    }
73
74    public void setAttribute(final String id, final Object obj) {
75        if (id == null) {
76            throw new IllegalArgumentException("Id may not be null");
77        }
78        if (this.map == null) {
79            this.map = new HashMap();
80        }
81        this.map.put(id, obj);
82    }
83
84    public Object removeAttribute(final String id) {
85        if (id == null) {
86            throw new IllegalArgumentException("Id may not be null");
87        }
88        if (this.map != null) {
89            return this.map.remove(id);
90        } else {
91            return null;
92        }
93    }
94
95}
96