01: /*
02: * $HeadURL: https://svn.apache.org/repos/asf/jakarta/httpcomponents/oac.hc3x/tags/HTTPCLIENT_3_1/src/java/org/apache/commons/httpclient/util/LangUtils.java $
03: * $Revision: 480424 $
04: * $Date: 2006-11-29 06:56:49 +0100 (Wed, 29 Nov 2006) $
05: *
06: * ====================================================================
07: *
08: * Licensed to the Apache Software Foundation (ASF) under one or more
09: * 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: }
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