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Java > Open Source Codes > org > apache > commons > httpclient > util > LangUtils


1 /*
2  * $HeadURL: https://svn.apache.org/repos/asf/jakarta/commons/proper/httpclient/trunk/src/java/org/apache/commons/httpclient/util/LangUtils.java $
3  * $Revision: 480424 $
4  * $Date: 2006-11-29 05:56:49 +0000 (Wed, 29 Nov 2006) $
5  *
6  * ====================================================================
7  *
8  * Licensed to the Apache Software Foundation (ASF) under one or more
9  * contributor license agreements. See the NOTICE file distributed with
10  * this work for additional information regarding copyright ownership.
11  * The ASF licenses this file to You under the Apache License, Version 2.0
12  * (the "License"); you may not use this file except in compliance with
13  * 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, software
18  * distributed under the License is distributed on an "AS IS" BASIS,
19  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
20  * See the License for the specific language governing permissions and
21  * limitations under the License.
22  * ====================================================================
23  *
24  * This software consists of voluntary contributions made by many
25  * individuals on behalf of the Apache Software Foundation. For more
26  * information on the Apache Software Foundation, please see
27  * <http://www.apache.org/>.
28  *
29  */
30
31 package org.apache.commons.httpclient.util;
32
33 /**
34  * A set of utility methods to help produce consistent Object#equals(Object) and
35  * Object#hashCode methods.
36  *
37  * @author <a HREF="mailto:oleg at ural.ru">Oleg Kalnichevski</a>
38  *
39  * @since 3.0
40  */
41 public class LangUtils {
42     
43     public static final int HASH_SEED = 17;
44     public static final int HASH_OFFSET = 37;
45     
46     private LangUtils() {
47         super();
48     }
49
50     public static int hashCode(final int seed, final int hashcode) {
51         return seed * HASH_OFFSET + hashcode;
52     }
53
54     public static int hashCode(final int seed, final Object JavaDoc obj) {
55         return hashCode(seed, obj != null ? obj.hashCode() : 0);
56     }
57     
58     public static int hashCode(final int seed, final boolean b) {
59         return hashCode(seed, b ? 1 : 0);
60     }
61     
62     public static boolean equals(final Object JavaDoc obj1, final Object JavaDoc obj2) {
63         return obj1 == null ? obj2 == null : obj1.equals(obj2);
64     }
65
66 }
67
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