/*
* $Id: CompareUtil.java 787720 2009-06-23 15:39:21Z apetrelli $
*
* 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: 787720 $ $Date: 2009-06-24 01:39:21 +1000 (Wed, 24 Jun 2009) $
* @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;
}
}