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/*
* 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.tools.ant.types.selectors.modifiedselector;
import java.util.Comparator;
/**
* Simple implementation of Comparator for use in CacheSelector.
* compare() returns '0' (should not be selected) if both parameter
* are equal otherwise '1' (should be selected).
*
* @version 2003-09-13
* @since Ant 1.6
*/
public class EqualComparator implements Comparator<Object> {
/**
* Implements Comparator.compare().
* @param o1 the first object
* @param o2 the second object
* @return 0, if both are equal, otherwise 1
*/
public int compare(Object o1, Object o2) {
if (o1 == null) {
if (o2 == null) {
return 1;
}
return 0;
}
return (o1.equals(o2)) ? 0 : 1;
}
/**
* Override Object.toString().
* @return information about this comparator
*/
public String toString() {
return "EqualComparator";
}
}
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