Copying from Collections to Lang

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/lang/trunk@1154842 13f79535-47bb-0310-9956-ffa450edef68

src/test/java/org/apache/commons/lang3/compare/TestReverseComparator.java

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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.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;
+
+/**
+ * Tests for ReverseComparator.
+ *
+ * @version $Revision$ $Date$
+ *
+ * @author Unknown
+ */
+public class TestReverseComparator extends AbstractTestComparator<Integer> {
+
+    public TestReverseComparator(String testName) {
+        super(testName);
+    }
+
+    /**
+     * 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 SVN.
+     *
+     * @return Comparator that returns "natural" order
+     */
+    @Override
+    public Comparator<Integer> makeObject() {
+        return new ReverseComparator<Integer>(Collections.<Integer>reverseOrder());
+    }
+
+    @Override
+    public List<Integer> getComparableObjectsOrdered() {
+        List<Integer> list = new LinkedList<Integer>();
+        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.
+     */
+    @Override
+    @SuppressWarnings("unchecked")
+    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);
+    }
+
+}