01: /*
02: * $HeadURL: https://svn.apache.org/repos/asf/httpcomponents/httpcore/tags/4.0-beta1/module-main/src/main/java/org/apache/http/util/LangUtils.java $
03: * $Revision: 503413 $
04: * $Date: 2007-02-04 15:22:14 +0100 (Sun, 04 Feb 2007) $
05: *
06: * ====================================================================
07: * Licensed to the Apache Software Foundation (ASF) under one
08: * or more contributor license agreements. See the NOTICE file
09: * distributed with this work for additional information
10: * regarding copyright ownership. The ASF licenses this file
11: * to you under the Apache License, Version 2.0 (the
12: * "License"); you may not use this file except in compliance
13: * with 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,
18: * software distributed under the License is distributed on an
19: * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
20: * KIND, either express or implied. See the License for the
21: * specific language governing permissions and limitations
22: * under the License.
23: * ====================================================================
24: *
25: * This software consists of voluntary contributions made by many
26: * individuals on behalf of the Apache Software Foundation. For more
27: * information on the Apache Software Foundation, please see
28: * <http://www.apache.org/>.
29: *
30: */
31:
32: package org.apache.http.util;
33:
34: /**
35: * A set of utility methods to help produce consistent
36: * {@link Object#equals equals} and {@link Object#hashCode hashCode} methods.
37: *
38: * @author <a href="mailto:oleg at ural.ru">Oleg Kalnichevski</a>
39: *
40: * @since 4.0
41: */
42: public final class LangUtils {
43:
44: public static final int HASH_SEED = 17;
45: public static final int HASH_OFFSET = 37;
46:
47: /** Disabled default constructor. */
48: private LangUtils() {
49: }
50:
51: public static int hashCode(final int seed, final int hashcode) {
52: return seed * HASH_OFFSET + hashcode;
53: }
54:
55: public static int hashCode(final int seed, final boolean b) {
56: return hashCode(seed, b ? 1 : 0);
57: }
58:
59: public static int hashCode(final int seed, final Object obj) {
60: return hashCode(seed, obj != null ? obj.hashCode() : 0);
61: }
62:
63: public static boolean equals(final Object obj1, final Object obj2) {
64: return obj1 == null ? obj2 == null : obj1.equals(obj2);
65: }
66:
67: public static boolean equals(final Object[] a1, final Object[] a2) {
68: if (a1 == null) {
69: if (a2 == null) {
70: return true;
71: } else {
72: return false;
73: }
74: } else {
75: if (a2 != null && a1.length == a2.length) {
76: for (int i = 0; i < a1.length; i++) {
77: if (!equals(a1[i], a2[i])) {
78: return false;
79: }
80: }
81: return true;
82: } else {
83: return false;
84: }
85: }
86: }
87:
88: }
|