1 /* 2 * ==================================================================== 3 * Licensed to the Apache Software Foundation (ASF) under one 4 * or more contributor license agreements. See the NOTICE file 5 * distributed with this work for additional information 6 * regarding copyright ownership. The ASF licenses this file 7 * to you under the Apache License, Version 2.0 (the 8 * "License"); you may not use this file except in compliance 9 * with the License. You may obtain a copy of the License at 10 * 11 * http://www.apache.org/licenses/LICENSE-2.0 12 * 13 * Unless required by applicable law or agreed to in writing, 14 * software distributed under the License is distributed on an 15 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY 16 * KIND, either express or implied. See the License for the 17 * specific language governing permissions and limitations 18 * under the License. 19 * ==================================================================== 20 * 21 * This software consists of voluntary contributions made by many 22 * individuals on behalf of the Apache Software Foundation. For more 23 * information on the Apache Software Foundation, please see 24 * <http://www.apache.org/>. 25 * 26 */ 27 28 package org.apache.hc.core5.util; 29 30 import java.util.Arrays; 31 import java.util.Objects; 32 33 /** 34 * A set of utility methods to help produce consistent 35 * {@link Object#equals equals} and {@link Object#hashCode hashCode} methods. 36 * 37 * 38 * @since 4.0 39 */ 40 public final class LangUtils { 41 42 public static final int HASH_SEED = 17; 43 public static final int HASH_OFFSET = 37; 44 45 /** Disabled default constructor. */ 46 private LangUtils() { 47 } 48 49 public static int hashCode(final int seed, final int hashcode) { 50 return seed * HASH_OFFSET + hashcode; 51 } 52 53 public static int hashCode(final int seed, final boolean b) { 54 return hashCode(seed, b ? 1 : 0); 55 } 56 57 public static int hashCode(final int seed, final Object obj) { 58 return hashCode(seed, obj != null ? obj.hashCode() : 0); 59 } 60 61 /** 62 * Check if two objects are equal. 63 * 64 * @param obj1 first object to compare, may be {@code null} 65 * @param obj2 second object to compare, may be {@code null} 66 * @return {@code true} if the objects are equal or both null 67 * @deprecated Use {@link Objects#equals(Object)}. 68 */ 69 @Deprecated 70 public static boolean equals(final Object obj1, final Object obj2) { 71 return Objects.equals(obj1, obj2); 72 } 73 74 /** 75 * Check if two object arrays are equal. 76 * <ul> 77 * <li>If both parameters are null, return {@code true}</li> 78 * <li>If one parameter is null, return {@code false}</li> 79 * <li>If the array lengths are different, return {@code false}</li> 80 * <li>Compare array elements using .equals(); return {@code false} if any comparisons fail.</li> 81 * <li>Return {@code true}</li> 82 * </ul> 83 * 84 * @param a1 first array to compare, may be {@code null} 85 * @param a2 second array to compare, may be {@code null} 86 * @return {@code true} if the arrays are equal or both null 87 * @deprecated Use {@link Arrays#equals(Object)}. 88 */ 89 @Deprecated 90 public static boolean equals(final Object[] a1, final Object[] a2) { 91 return Arrays.equals(a1, a2); 92 } 93 94 }