1 /*
2 * $HeadURL: https://svn.apache.org/repos/asf/httpcomponents/oac.hc3x/trunk/src/java/org/apache/commons/httpclient/util/LangUtils.java $
3 * $Revision$
4 * $Date$
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 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 obj1, final Object obj2) {
63 return obj1 == null ? obj2 == null : obj1.equals(obj2);
64 }
65
66 }