/*
* Copyright 2001-2004 The Apache Software Foundation
*
* 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.apache.commons.collections.comparators;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.util.Collections;
import java.util.Comparator;
import java.util.LinkedList;
import java.util.List;
import junit.framework.Test;
import junit.framework.TestSuite;
/**
* Tests for ReverseComparator.
*
* @version $Revision: 155406 $ $Date: 2005-02-26 12:55:26 +0000 (Sat, 26 Feb 2005) $
*
* @author Unknown
*/
public class TestReverseComparator extends AbstractTestComparator {
public TestReverseComparator(String testName) {
super(testName);
}
public static Test suite() {
return new TestSuite(TestReverseComparator.class);
}
/**
* For the purposes of this test, return a
* ReverseComparator that wraps the java.util.Collections.reverseOrder()
* Comparator. The resulting comparator should
* sort according to natural Order. (Note: we wrap
* a Comparator taken from the JDK so that we can
* save a "canonical" form in CVS.
*
* @return Comparator that returns "natural" order
*/
public Comparator makeComparator() {
return new ReverseComparator(Collections.reverseOrder());
}
public List getComparableObjectsOrdered() {
List list = new LinkedList();
list.add(new Integer(1));
list.add(new Integer(2));
list.add(new Integer(3));
list.add(new Integer(4));
list.add(new Integer(5));
return list;
}
/**
* Override this inherited test since Collections.reverseOrder
* doesn't adhere to the "soft" Comparator contract, and we've
* already "cannonized" the comparator returned by makeComparator.
*/
public void testSerializeDeserializeThenCompare() throws Exception {
Comparator comp = new ReverseComparator(new ComparableComparator());
ByteArrayOutputStream buffer = new ByteArrayOutputStream();
ObjectOutputStream out = new ObjectOutputStream(buffer);
out.writeObject(comp);
out.close();
ObjectInputStream in = new ObjectInputStream(new ByteArrayInputStream(buffer.toByteArray()));
Object dest = in.readObject();
in.close();
assertEquals("obj != deserialize(serialize(obj))",comp,dest);
}
}