1 /*
2 * ====================================================================
3 * Licensed to the Apache Software Foundation (ASF) under one
4 * or more contributor license agreements. See the NOTICE file
5 * distributed with this work for additional information
6 * regarding copyright ownership. The ASF licenses this file
7 * to you under the Apache License, Version 2.0 (the
8 * "License"); you may not use this file except in compliance
9 * with the License. You may obtain a copy of the License at
10 *
11 * http://www.apache.org/licenses/LICENSE-2.0
12 *
13 * Unless required by applicable law or agreed to in writing,
14 * software distributed under the License is distributed on an
15 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
16 * KIND, either express or implied. See the License for the
17 * specific language governing permissions and limitations
18 * under the License.
19 * ====================================================================
20 *
21 * This software consists of voluntary contributions made by many
22 * individuals on behalf of the Apache Software Foundation. For more
23 * information on the Apache Software Foundation, please see
24 * <http://www.apache.org/>.
25 *
26 */
27
28 package org.apache.http.protocol;
29
30 import java.util.HashMap;
31 import java.util.Map;
32
33 import org.apache.http.annotation.NotThreadSafe;
34 import org.apache.http.util.Args;
35
36 /**
37 * Default implementation of {@link HttpContext}.
38 * <p>
39 * Please note methods of this class are not synchronized and therefore may
40 * be threading unsafe.
41 *
42 * @since 4.0
43 */
44 @NotThreadSafe
45 public class BasicHttpContext implements HttpContext {
46
47 private final HttpContext parentContext;
48 private Map<String, Object> map = null;
49
50 public BasicHttpContext() {
51 this(null);
52 }
53
54 public BasicHttpContext(final HttpContext parentContext) {
55 super();
56 this.parentContext = parentContext;
57 }
58
59 public Object getAttribute(final String id) {
60 Args.notNull(id, "Id");
61 Object obj = null;
62 if (this.map != null) {
63 obj = this.map.get(id);
64 }
65 if (obj == null && this.parentContext != null) {
66 obj = this.parentContext.getAttribute(id);
67 }
68 return obj;
69 }
70
71 public void setAttribute(final String id, final Object obj) {
72 Args.notNull(id, "Id");
73 if (this.map == null) {
74 this.map = new HashMap<String, Object>();
75 }
76 this.map.put(id, obj);
77 }
78
79 public Object removeAttribute(final String id) {
80 Args.notNull(id, "Id");
81 if (this.map != null) {
82 return this.map.remove(id);
83 } else {
84 return null;
85 }
86 }
87
88 /**
89 * @since 4.2
90 */
91 public void clear() {
92 if (this.map != null) {
93 this.map.clear();
94 }
95 }
96
97 @Override
98 public String toString() {
99 if (this.map != null) {
100 return this.map.toString();
101 } else {
102 return "{}";
103 }
104 }
105 }