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106 lines
3.5 KiB
Java
106 lines
3.5 KiB
Java
/*
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* ====================================================================
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* Licensed to the Apache Software Foundation (ASF) under one
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* or more contributor license agreements. See the NOTICE file
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* distributed with this work for additional information
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* regarding copyright ownership. The ASF licenses this file
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* to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance
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* with the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing,
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* software distributed under the License is distributed on an
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* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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* KIND, either express or implied. See the License for the
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* specific language governing permissions and limitations
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* under the License.
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* ====================================================================
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*
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* This software consists of voluntary contributions made by many
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* individuals on behalf of the Apache Software Foundation. For more
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* information on the Apache Software Foundation, please see
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* <http://www.apache.org/>.
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*
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*/
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package ch.boye.httpclientandroidlib.util;
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/**
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* A set of utility methods to help produce consistent
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* {@link Object#equals equals} and {@link Object#hashCode hashCode} methods.
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*
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*
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* @since 4.0
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*/
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public final class LangUtils {
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public static final int HASH_SEED = 17;
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public static final int HASH_OFFSET = 37;
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/** Disabled default constructor. */
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private LangUtils() {
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}
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public static int hashCode(final int seed, final int hashcode) {
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return seed * HASH_OFFSET + hashcode;
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}
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public static int hashCode(final int seed, final boolean b) {
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return hashCode(seed, b ? 1 : 0);
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}
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public static int hashCode(final int seed, final Object obj) {
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return hashCode(seed, obj != null ? obj.hashCode() : 0);
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}
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/**
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* Check if two objects are equal.
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*
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* @param obj1 first object to compare, may be {@code null}
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* @param obj2 second object to compare, may be {@code null}
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* @return {@code true} if the objects are equal or both null
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*/
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public static boolean equals(final Object obj1, final Object obj2) {
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return obj1 == null ? obj2 == null : obj1.equals(obj2);
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}
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/**
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* Check if two object arrays are equal.
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* <p>
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* <ul>
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* <li>If both parameters are null, return {@code true}</li>
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* <li>If one parameter is null, return {@code false}</li>
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* <li>If the array lengths are different, return {@code false}</li>
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* <li>Compare array elements using .equals(); return {@code false} if any comparisons fail.</li>
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* <li>Return {@code true}</li>
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* </ul>
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*
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* @param a1 first array to compare, may be {@code null}
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* @param a2 second array to compare, may be {@code null}
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* @return {@code true} if the arrays are equal or both null
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*/
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public static boolean equals(final Object[] a1, final Object[] a2) {
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if (a1 == null) {
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if (a2 == null) {
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return true;
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} else {
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return false;
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}
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} else {
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if (a2 != null && a1.length == a2.length) {
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for (int i = 0; i < a1.length; i++) {
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if (!equals(a1[i], a2[i])) {
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return false;
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}
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}
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return true;
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} else {
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return false;
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}
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}
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}
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}
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