1 /* 2 * $Id: CompareUtil.java 787720 2009-06-23 15:39:21Z apetrelli $ 3 * 4 * Licensed to the Apache Software Foundation (ASF) under one 5 * or more contributor license agreements. See the NOTICE file 6 * distributed with this work for additional information 7 * regarding copyright ownership. The ASF licenses this file 8 * to you under the Apache License, Version 2.0 (the 9 * "License"); you may not use this file except in compliance 10 * with the License. You may obtain a copy of the License at 11 * 12 * http://www.apache.org/licenses/LICENSE-2.0 13 * 14 * Unless required by applicable law or agreed to in writing, 15 * software distributed under the License is distributed on an 16 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY 17 * KIND, either express or implied. See the License for the 18 * specific language governing permissions and limitations 19 * under the License. 20 */ 21 22 package org.apache.tiles; 23 24 /** 25 * Utilities to work with comparation between objects. 26 * 27 * @version $Rev: 787720 $ $Date: 2009-06-24 01:39:21 +1000 (Wed, 24 Jun 2009) $ 28 * @since 2.2.0 29 */ 30 public final class CompareUtil { 31 32 /** 33 * Private constructor to avoid instantiation. 34 */ 35 private CompareUtil() { } 36 37 /** 38 * Checks if two objects (eventually null) are the same. They are considered the same 39 * even if they are both null. 40 * 41 * @param obj1 The first object to check. 42 * @param obj2 The second object to check. 43 * @return <code>true</code> if the objects are the same. 44 * @since 2.2.0 45 */ 46 public static boolean nullSafeEquals(Object obj1, Object obj2) { 47 if (obj1 != null) { 48 return obj1.equals(obj2); 49 } 50 return obj2 == null; 51 } 52 53 /** 54 * Returns <code>0</code> if the object is null, the hash code of the object 55 * otherwise. 56 * 57 * @param obj The object from which the hash code must be calculated.. 58 * @return The hash code. 59 * @since 2.2.0 60 */ 61 public static int nullSafeHashCode(Object obj) { 62 if (obj != null) { 63 return obj.hashCode(); 64 } 65 return 0; 66 } 67 }