1 /*
2 * Licensed to the Apache Software Foundation (ASF) under one
3 * or more contributor license agreements. See the NOTICE file
4 * distributed with this work for additional information
5 * regarding copyright ownership. The ASF licenses this file
6 * to you under the Apache License, Version 2.0 (the
7 * "License"); you may not use this file except in compliance
8 * with the License. You may obtain a copy of the License at
9 *
10 * http://www.apache.org/licenses/LICENSE-2.0
11 *
12 * Unless required by applicable law or agreed to in writing,
13 * software distributed under the License is distributed on an
14 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
15 * KIND, either express or implied. See the License for the
16 * specific language governing permissions and limitations
17 * under the License.
18 *
19 */
20 package org.apache.mina.core.session;
21
22 import java.io.Serializable;
23
24 /**
25 * Creates a Key from a class name and an attribute name. The resulting Key will
26 * be stored in the session Map.<br>
27 * For instance, we can create a 'processor' AttributeKey this way :
28 *
29 * <pre>
30 * private static final AttributeKey PROCESSOR = new AttributeKey(
31 * SimpleIoProcessorPool.class, "processor");
32 * </pre>
33 *
34 * This will create the <b>SimpleIoProcessorPool.processor@7DE45C99</b> key
35 * which will be stored in the session map.<br>
36 * Such an attributeKey is mainly useful for debug purposes.
37 *
38 * @author <a href="http://mina.apache.org">Apache MINA Project</a>
39 */
40 public final class AttributeKey implements Serializable {
41 /** The serial version UID */
42 private static final long serialVersionUID = -583377473376683096L;
43
44 /** The attribute's name */
45 private final String name;
46
47 /**
48 * Creates a new instance. It's built from :
49 * <ul>
50 * <li>the class' name</li>
51 * <li>the attribute's name</li>
52 * <li>this attribute hashCode</li>
53 * </ul>
54 *
55 * @param source The class this AttributeKey will be attached to
56 * @param name The Attribute name
57 */
58 public AttributeKey(Class<?> source, String name) {
59 this.name = source.getName() + '.' + name + '@' + Integer.toHexString(this.hashCode());
60 }
61
62 /**
63 * The String representation of this object.
64 */
65 @Override
66 public String toString() {
67 return name;
68 }
69
70 @Override
71 public int hashCode() {
72 int h = 17 * 37 + ((name == null) ? 0 : name.hashCode());
73 return h;
74 }
75
76 @Override
77 public boolean equals(Object obj) {
78 if (this == obj) {
79 return true;
80 }
81
82 if (!(obj instanceof AttributeKey)) {
83 return false;
84 }
85
86 AttributeKey other = (AttributeKey) obj;
87
88 return name.equals(other.name);
89 }
90 }
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