source: contrib/MailArchiver/sources/vendor/mime4j/apache-mime4j-0.7-SNAPSHOT-20110327.010440-17/core/src/main/java/org/apache/james/mime4j/util/LangUtils.java @ 6785

Revision 6785, 2.7 KB checked in by rafaelraymundo, 12 years ago (diff)

Ticket #2946 - Liberado codigo do MailArchiver?. Documentação na subpasta DOCS.

Line 
1/****************************************************************
2 * Licensed to the Apache Software Foundation (ASF) under one   *
3 * or more contributor license agreements.  See the NOTICE file *
4 * distributed with this work for additional information        *
5 * regarding copyright ownership.  The ASF licenses this file   *
6 * to you under the Apache License, Version 2.0 (the            *
7 * "License"); you may not use this file except in compliance   *
8 * with the License.  You may obtain a copy of the License at   *
9 *                                                              *
10 *   http://www.apache.org/licenses/LICENSE-2.0                 *
11 *                                                              *
12 * Unless required by applicable law or agreed to in writing,   *
13 * software distributed under the License is distributed on an  *
14 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY       *
15 * KIND, either express or implied.  See the License for the    *
16 * specific language governing permissions and limitations      *
17 * under the License.                                           *
18 ****************************************************************/
19
20package org.apache.james.mime4j.util;
21
22/**
23 * A set of utility methods to help produce consistent
24 * {@link Object#equals equals} and {@link Object#hashCode hashCode} methods.
25 */
26public final class LangUtils {
27
28    public static final int HASH_SEED = 17;
29    public static final int HASH_OFFSET = 37;
30
31    /** Disabled default constructor. */
32    private LangUtils() {
33    }
34
35    public static int hashCode(final int seed, final int hashcode) {
36        return seed * HASH_OFFSET + hashcode;
37    }
38
39    public static int hashCode(final int seed, final boolean b) {
40        return hashCode(seed, b ? 1 : 0);
41    }
42
43    public static int hashCode(final int seed, final Object obj) {
44        return hashCode(seed, obj != null ? obj.hashCode() : 0);
45    }
46
47    /**
48     * Check if two objects are equal.
49     *
50     * @param obj1 first object to compare, may be {@code null}
51     * @param obj2 second object to compare, may be {@code null}
52     * @return {@code true} if the objects are equal or both null
53     */
54    public static boolean equals(final Object obj1, final Object obj2) {
55        return obj1 == null ? obj2 == null : obj1.equals(obj2);
56    }
57
58    /**
59     * Check if two strings are equal, ignoring case considerations.
60     *
61     * @param s1 first string to compare, may be {@code null}
62     * @param s2 second string to compare, may be {@code null}
63     * @return {@code true} if the objects are equal or both null
64     */
65    public static boolean equalsIgnoreCase(final String s1, final String s2) {
66        return s1 == null ? s2 == null : s1.equalsIgnoreCase(s2);
67    }
68
69}
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