| /* |
| * $Id$ |
| * |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, |
| * software distributed under the License is distributed on an |
| * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| * KIND, either express or implied. See the License for the |
| * specific language governing permissions and limitations |
| * under the License. |
| */ |
| |
| package org.apache.tiles; |
| |
| /** |
| * Utilities to work with comparation between objects. |
| * |
| * @version $Rev$ $Date$ |
| * @since 2.2.0 |
| */ |
| public final class CompareUtil { |
| |
| /** |
| * Private constructor to avoid instantiation. |
| */ |
| private CompareUtil() { } |
| |
| /** |
| * Checks if two objects (eventually null) are the same. They are considered the same |
| * even if they are both null. |
| * |
| * @param obj1 The first object to check. |
| * @param obj2 The second object to check. |
| * @return <code>true</code> if the objects are the same. |
| * @since 2.2.0 |
| */ |
| public static boolean nullSafeEquals(Object obj1, Object obj2) { |
| if (obj1 != null) { |
| return obj1.equals(obj2); |
| } |
| return obj2 == null; |
| } |
| |
| /** |
| * Returns <code>0</code> if the object is null, the hash code of the object |
| * otherwise. |
| * |
| * @param obj The object from which the hash code must be calculated.. |
| * @return The hash code. |
| * @since 2.2.0 |
| */ |
| public static int nullSafeHashCode(Object obj) { |
| if (obj != null) { |
| return obj.hashCode(); |
| } |
| return 0; |
| } |
| } |