1 /*
2 * $HeadURL: https://svn.apache.org/repos/asf/jakarta/commons/proper/httpclient/branches/HTTPCLIENT_3_0_BRANCH/src/java/org/apache/commons/httpclient/util/LangUtils.java $
3 * $Revision: 354155 $
4 * $Date: 2005-12-05 15:18:10 -0500 (Mon, 05 Dec 2005) $
5 *
6 * ====================================================================
7 *
8 * Copyright 1999-2004 The Apache Software Foundation
9 *
10 * Licensed under the Apache License, Version 2.0 (the "License");
11 * you may not use this file except in compliance with the License.
12 * You may obtain a copy of the License at
13 *
14 * http://www.apache.org/licenses/LICENSE-2.0
15 *
16 * Unless required by applicable law or agreed to in writing, software
17 * distributed under the License is distributed on an "AS IS" BASIS,
18 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
19 * See the License for the specific language governing permissions and
20 * limitations under the License.
21 * ====================================================================
22 *
23 * This software consists of voluntary contributions made by many
24 * individuals on behalf of the Apache Software Foundation. For more
25 * information on the Apache Software Foundation, please see
26 * <http://www.apache.org/>.
27 *
28 */
29
30 package org.apache.commons.httpclient.util;
31
32 /***
33 * A set of utility methods to help produce consistent Object#equals(Object) and
34 * Object#hashCode methods.
35 *
36 * @author <a href="mailto:oleg at ural.ru">Oleg Kalnichevski</a>
37 *
38 * @since 3.0
39 */
40 public class LangUtils {
41
42 public static final int HASH_SEED = 17;
43 public static final int HASH_OFFSET = 37;
44
45 private LangUtils() {
46 super();
47 }
48
49 public static int hashCode(final int seed, final int hashcode) {
50 return seed * HASH_OFFSET + hashcode;
51 }
52
53 public static int hashCode(final int seed, final Object obj) {
54 return hashCode(seed, obj != null ? obj.hashCode() : 0);
55 }
56
57 public static int hashCode(final int seed, final boolean b) {
58 return hashCode(seed, b ? 1 : 0);
59 }
60
61 public static boolean equals(final Object obj1, final Object obj2) {
62 return obj1 == null ? obj2 == null : obj1.equals(obj2);
63 }
64
65 }