Source code: org/apache/http/util/LangUtils.java
1 /*
2 * $HeadURL: https://svn.apache.org/repos/asf/jakarta/httpcomponents/httpcore/tags/4.0-alpha2/src/java/org/apache/http/util/LangUtils.java $
3 * $Revision: 390703 $
4 * $Date: 2006-04-01 19:35:45 +0200 (Sat, 01 Apr 2006) $
5 *
6 * ====================================================================
7 *
8 * Copyright 1999-2006 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.http.util;
31
32 /**
33 * A set of utility methods to help produce consistent
34 * {@link Object#equals equals} and {@link Object#hashCode hashCode} methods.
35 *
36 * @author <a href="mailto:oleg at ural.ru">Oleg Kalnichevski</a>
37 *
38 * @since 4.0
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 }
47
48 public static int hashCode(final int seed, final int hashcode) {
49 return seed * HASH_OFFSET + hashcode;
50 }
51
52 public static int hashCode(final int seed, final boolean b) {
53 return hashCode(seed, b ? 1 : 0);
54 }
55
56 public static int hashCode(final int seed, final Object obj) {
57 return hashCode(seed, obj != null ? obj.hashCode() : 0);
58 }
59
60 public static boolean equals(final Object obj1, final Object obj2) {
61 return obj1 == null ? obj2 == null : obj1.equals(obj2);
62 }
63
64 public static boolean equals(final Object[] a1, final Object[] a2) {
65 if (a1 == null) {
66 if (a2 == null) {
67 return true;
68 } else {
69 return false;
70 }
71 } else {
72 if (a2 != null && a1.length == a2.length) {
73 for (int i = 0; i < a1.length; i++) {
74 if (!equals(a1[i], a2[i])) {
75 return false;
76 }
77 }
78 return true;
79 } else {
80 return false;
81 }
82 }
83 }
84
85 }