ReverseComparatorTests.java

/*******************************************************************************
 * Copyright (c) 1998, 2015 Oracle and/or its affiliates. All rights reserved.
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Public License v1.0 and Eclipse Distribution License v. 1.0
 * which accompanies this distribution.
 * The Eclipse Public License is available at http://www.eclipse.org/legal/epl-v10.html
 * and the Eclipse Distribution License is available at
 * http://www.eclipse.org/org/documents/edl-v10.php.
 *
 * Contributors:
 *     Oracle - initial API and implementation from Oracle TopLink
******************************************************************************/
package org.eclipse.persistence.tools.workbench.test.utility;

import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.List;

import junit.framework.Test;
import junit.framework.TestCase;
import junit.framework.TestSuite;

import org.eclipse.persistence.tools.workbench.utility.ReverseComparator;

public class ReverseComparatorTests extends TestCase {
    private Comparator naturalReverseComparator;
    private Comparator customComparator;
    private Comparator customReverseComparator;

    public static Test suite() {
        return new TestSuite(ReverseComparatorTests.class);
    }

    public ReverseComparatorTests(String name) {
        super(name);
    }

    protected void setUp() throws Exception {
        super.setUp();
        this.naturalReverseComparator = new ReverseComparator();
        this.customComparator = this.buildCustomComparator();
        this.customReverseComparator = new ReverseComparator(this.customComparator);
    }

    private Comparator buildCustomComparator() {
        return new Comparator() {
            public int compare(Object o1, Object o2) {
                String s1 = (String) o1;
                String s2 = (String) o2;
                String lower1 = s1.toLowerCase();
                String lower2 = s2.toLowerCase();
                int result = lower1.compareTo(lower2);
                if (result == 0) {
                    return s1.compareTo(s2);    // use case to differentiate "equal" strings
                }
                return result;
            }
        };
    }

    private List buildUnsortedList() {
        List result = new ArrayList();
        result.add("T");
        result.add("Z");
        result.add("Y");
        result.add("M");
        result.add("m");
        result.add("a");
        result.add("B");
        result.add("b");
        result.add("A");
        return result;
    }

    private List buildNaturallySortedList() {
        List result = new ArrayList(this.buildUnsortedList());
        Collections.sort(result);
        return result;
    }

    private List buildCustomSortedList() {
        List result = new ArrayList(this.buildUnsortedList());
        Collections.sort(result, this.customComparator);
        return result;
    }

    protected void tearDown() throws Exception {
        TestTools.clear(this);
        super.tearDown();
    }

    public void testNatural() {
        List list = this.buildUnsortedList();
        Collections.sort(list, this.naturalReverseComparator);
        this.verifyList(this.buildNaturallySortedList(), list);
    }

    public void testCustom() {
        List list = this.buildUnsortedList();
        Collections.sort(list, this.customReverseComparator);
        this.verifyList(this.buildCustomSortedList(), list);
    }

    private void verifyList(List normal, List reverse) {
        int size = normal.size();
        int max = size - 1;
        for (int i = 0; i < size; i++) {
            assertEquals(normal.get(i), reverse.get(max - i));
        }
    }
}