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Commons Collections example source code file (TestReverseComparator.java)
The Commons Collections TestReverseComparator.java source code/* * 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.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: 646780 $ $Date: 2008-04-10 13:48:07 +0100 (Thu, 10 Apr 2008) $ * * @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); } } Other Commons Collections examples (source code examples)Here is a short list of links related to this Commons Collections TestReverseComparator.java source code file: |
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