/*
* Copyright 2002-2005 the original author or authors.
*
* 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.springframework.util.comparator;
import java.util.Comparator;
import org.springframework.util.Assert;
/**
* Comparator that adapts Comparables to the Comparator interface.
* Mainly for internal use in other Comparators, when supposed
* to work on Comparables.
*
* @author Keith Donald
* @since 1.2.2
* @see Comparable
*/
public class ComparableComparator implements Comparator {
public int compare(Object o1, Object o2) {
Assert.isTrue(o1 instanceof Comparable, "The first object provided is not Comparable");
Assert.isTrue(o2 instanceof Comparable, "The second object provided is not Comparable");
return ((Comparable) o1).compareTo(o2);
}
}