[6785] | 1 | /**************************************************************** |
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| 2 | * Licensed to the Apache Software Foundation (ASF) under one * |
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| 3 | * or more contributor license agreements. See the NOTICE file * |
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| 4 | * distributed with this work for additional information * |
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| 5 | * regarding copyright ownership. The ASF licenses this file * |
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| 6 | * to you under the Apache License, Version 2.0 (the * |
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| 7 | * "License"); you may not use this file except in compliance * |
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| 8 | * with the License. You may obtain a copy of the License at * |
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| 9 | * * |
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| 10 | * http://www.apache.org/licenses/LICENSE-2.0 * |
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| 11 | * * |
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| 12 | * Unless required by applicable law or agreed to in writing, * |
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| 13 | * software distributed under the License is distributed on an * |
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| 14 | * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY * |
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| 15 | * KIND, either express or implied. See the License for the * |
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| 16 | * specific language governing permissions and limitations * |
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| 17 | * under the License. * |
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| 18 | ****************************************************************/ |
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| 19 | |
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| 20 | package org.apache.james.mime4j.util; |
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| 21 | |
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| 22 | /** |
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| 23 | * A set of utility methods to help produce consistent |
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| 24 | * {@link Object#equals equals} and {@link Object#hashCode hashCode} methods. |
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| 25 | */ |
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| 26 | public final class LangUtils { |
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| 27 | |
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| 28 | public static final int HASH_SEED = 17; |
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| 29 | public static final int HASH_OFFSET = 37; |
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| 30 | |
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| 31 | /** Disabled default constructor. */ |
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| 32 | private LangUtils() { |
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| 33 | } |
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| 34 | |
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| 35 | public static int hashCode(final int seed, final int hashcode) { |
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| 36 | return seed * HASH_OFFSET + hashcode; |
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| 37 | } |
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| 38 | |
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| 39 | public static int hashCode(final int seed, final boolean b) { |
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| 40 | return hashCode(seed, b ? 1 : 0); |
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| 41 | } |
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| 42 | |
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| 43 | public static int hashCode(final int seed, final Object obj) { |
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| 44 | return hashCode(seed, obj != null ? obj.hashCode() : 0); |
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| 45 | } |
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| 46 | |
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| 47 | /** |
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| 48 | * Check if two objects are equal. |
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| 49 | * |
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| 50 | * @param obj1 first object to compare, may be {@code null} |
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| 51 | * @param obj2 second object to compare, may be {@code null} |
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| 52 | * @return {@code true} if the objects are equal or both null |
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| 53 | */ |
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| 54 | public static boolean equals(final Object obj1, final Object obj2) { |
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| 55 | return obj1 == null ? obj2 == null : obj1.equals(obj2); |
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| 56 | } |
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| 57 | |
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| 58 | /** |
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| 59 | * Check if two strings are equal, ignoring case considerations. |
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| 60 | * |
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| 61 | * @param s1 first string to compare, may be {@code null} |
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| 62 | * @param s2 second string to compare, may be {@code null} |
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| 63 | * @return {@code true} if the objects are equal or both null |
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| 64 | */ |
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| 65 | public static boolean equalsIgnoreCase(final String s1, final String s2) { |
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| 66 | return s1 == null ? s2 == null : s1.equalsIgnoreCase(s2); |
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| 67 | } |
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| 68 | |
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| 69 | } |
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