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'databene commons' is an open source Java library by Volker Bergmann.
It provides extensions to the Java core library by utility classes, abstract concepts
and concrete implementations.
/*
* Copyright (C) 2004-2014 Volker Bergmann ([email protected]).
* All rights reserved.
*
* Licensed 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.databene.commons.comparator;
import java.util.Comparator;
/**
* Delegates comparation to a chain of comparators.
* They are evaluated consecutively and the first result that is not zero is returned.
* If all used Comparators return zero, zero is returned as the comparation result.
* You can use this, e.g. for ordering objects by attributes of different priority,
* e.g. country, city.
*
* Created: 22.05.2007 18:16:15
* @author Volker Bergmann
*/
public class ComparatorChain implements Comparator {
private Comparator[] comparators;
public ComparatorChain(Comparator ... comparators) {
this.comparators = comparators;
}
@Override
public int compare(E e1, E e2) {
for (Comparator comparator : comparators) {
int diff = comparator.compare(e1, e2);
if (diff != 0)
return diff;
}
return 0;
}
}