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Commons Collections example source code file (TestMultiKey.java)

This example Commons Collections source code file (TestMultiKey.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Commons Collections tags/keywords

exception, five, four, illegalargumentexception, integer, multikey, multikey, object, object, one, one, three, two, two, util

The Commons Collections TestMultiKey.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.keyvalue;

import java.util.Arrays;

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

/**
 * Unit tests for {@link org.apache.commons.collections.MultiKey}.
 * 
 * @version $Revision: 646780 $ $Date: 2008-04-10 13:48:07 +0100 (Thu, 10 Apr 2008) $
 * 
 * @author Stephen Colebourne
 */
public class TestMultiKey extends TestCase {

    Integer ONE = new Integer(1);
    Integer TWO = new Integer(2);
    Integer THREE = new Integer(3);
    Integer FOUR = new Integer(4);
    Integer FIVE = new Integer(5);
    
    public TestMultiKey(String name) {
        super(name);
    }

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

    public static void main(String[] args) {
        String[] testCaseName = { TestMultiKey.class.getName() };
        junit.textui.TestRunner.main(testCaseName);
    }

    public void setUp() throws Exception {
        super.setUp();
    }

    protected void tearDown() throws Exception {
        super.tearDown();
    }
    
    //-----------------------------------------------------------------------
    public void testConstructors() throws Exception {
        MultiKey mk = null;
        mk = new MultiKey(ONE, TWO);
        Assert.assertTrue(Arrays.equals(new Object[] {ONE, TWO}, mk.getKeys()));

        mk = new MultiKey(ONE, TWO, THREE);
        Assert.assertTrue(Arrays.equals(new Object[] {ONE, TWO, THREE}, mk.getKeys()));

        mk = new MultiKey(ONE, TWO, THREE, FOUR);
        Assert.assertTrue(Arrays.equals(new Object[] {ONE, TWO, THREE, FOUR}, mk.getKeys()));

        mk = new MultiKey(ONE, TWO, THREE, FOUR, FIVE);
        Assert.assertTrue(Arrays.equals(new Object[] {ONE, TWO, THREE, FOUR, FIVE}, mk.getKeys()));

        mk = new MultiKey(new Object[] {THREE, FOUR, ONE, TWO}, false);
        Assert.assertTrue(Arrays.equals(new Object[] {THREE, FOUR, ONE, TWO}, mk.getKeys()));
    }
    
    public void testConstructorsByArray() throws Exception {
        MultiKey mk = null;
        Object[] keys = new Object[] {THREE, FOUR, ONE, TWO};
        mk = new MultiKey(keys);
        Assert.assertTrue(Arrays.equals(new Object[] {THREE, FOUR, ONE, TWO}, mk.getKeys()));
        keys[3] = FIVE;  // no effect
        Assert.assertTrue(Arrays.equals(new Object[] {THREE, FOUR, ONE, TWO}, mk.getKeys()));

        keys = new Object[] {};
        mk = new MultiKey(keys);
        Assert.assertTrue(Arrays.equals(new Object[] {}, mk.getKeys()));

        keys = new Object[] {THREE, FOUR, ONE, TWO};
        mk = new MultiKey(keys, true);
        Assert.assertTrue(Arrays.equals(new Object[] {THREE, FOUR, ONE, TWO}, mk.getKeys()));
        keys[3] = FIVE;  // no effect
        Assert.assertTrue(Arrays.equals(new Object[] {THREE, FOUR, ONE, TWO}, mk.getKeys()));

        keys = new Object[] {THREE, FOUR, ONE, TWO};
        mk = new MultiKey(keys, false);
        Assert.assertTrue(Arrays.equals(new Object[] {THREE, FOUR, ONE, TWO}, mk.getKeys()));
        // change key - don't do this!
        // the hashcode of the MultiKey is now broken
        keys[3] = FIVE;
        Assert.assertTrue(Arrays.equals(new Object[] {THREE, FOUR, ONE, FIVE}, mk.getKeys()));
    }        
    
    public void testConstructorsByArrayNull() throws Exception {
        Object[] keys = null;
        try {
            new MultiKey(keys);
            fail();
        } catch (IllegalArgumentException ex) {}
        try {
            new MultiKey(keys, true);
            fail();
        } catch (IllegalArgumentException ex) {}
        try {
            new MultiKey(keys, false);
            fail();
        } catch (IllegalArgumentException ex) {}
    }
    
    public void testSize() {
        Assert.assertEquals(2, new MultiKey(ONE, TWO).size());
        Assert.assertEquals(2, new MultiKey(null, null).size());
        Assert.assertEquals(3, new MultiKey(ONE, TWO, THREE).size());
        Assert.assertEquals(3, new MultiKey(null, null, null).size());
        Assert.assertEquals(4, new MultiKey(ONE, TWO, THREE, FOUR).size());
        Assert.assertEquals(4, new MultiKey(null, null, null, null).size());
        Assert.assertEquals(5, new MultiKey(ONE, TWO, THREE, FOUR, FIVE).size());
        Assert.assertEquals(5, new MultiKey(null, null, null, null, null).size());
        
        Assert.assertEquals(0, new MultiKey(new Object[] {}).size());
        Assert.assertEquals(1, new MultiKey(new Object[] {ONE}).size());
        Assert.assertEquals(2, new MultiKey(new Object[] {ONE, TWO}).size());
        Assert.assertEquals(7, new MultiKey(new Object[] {ONE, TWO, ONE, TWO, ONE, TWO, ONE}).size());
    }
    
    public void testGetIndexed() {
        MultiKey mk = new MultiKey(ONE, TWO);
        Assert.assertSame(ONE, mk.getKey(0));
        Assert.assertSame(TWO, mk.getKey(1));
        try {
            mk.getKey(-1);
            fail();
        } catch (IndexOutOfBoundsException ex) {}
        try {
            mk.getKey(2);
            fail();
        } catch (IndexOutOfBoundsException ex) {}
    }
    
    public void testGetKeysSimpleConstructor() {
        MultiKey mk = new MultiKey(ONE, TWO);
        Object[] array = mk.getKeys();
        Assert.assertSame(ONE, array[0]);
        Assert.assertSame(TWO, array[1]);
        Assert.assertEquals(2, array.length);
    }
    
    public void testGetKeysArrayConstructorCloned() {
        Object[] keys = new Object[] {ONE, TWO};
        MultiKey mk = new MultiKey(keys, true);
        Object[] array = mk.getKeys();
        Assert.assertTrue(array != keys);
        Assert.assertTrue(Arrays.equals(array, keys));
        Assert.assertSame(ONE, array[0]);
        Assert.assertSame(TWO, array[1]);
        Assert.assertEquals(2, array.length);
    }
    
    public void testGetKeysArrayConstructorNonCloned() {
        Object[] keys = new Object[] {ONE, TWO};
        MultiKey mk = new MultiKey(keys, false);
        Object[] array = mk.getKeys();
        Assert.assertTrue(array != keys);  // still not equal
        Assert.assertTrue(Arrays.equals(array, keys));
        Assert.assertSame(ONE, array[0]);
        Assert.assertSame(TWO, array[1]);
        Assert.assertEquals(2, array.length);
    }
    
    public void testHashCode() {
        MultiKey mk1 = new MultiKey(ONE, TWO);
        MultiKey mk2 = new MultiKey(ONE, TWO);
        MultiKey mk3 = new MultiKey(ONE, "TWO");
        
        Assert.assertTrue(mk1.hashCode() == mk1.hashCode());
        Assert.assertTrue(mk1.hashCode() == mk2.hashCode());
        Assert.assertTrue(mk1.hashCode() != mk3.hashCode());
        
        int total = (0 ^ ONE.hashCode()) ^ TWO.hashCode();
        Assert.assertEquals(total, mk1.hashCode());
    }
    
    public void testEquals() {
        MultiKey mk1 = new MultiKey(ONE, TWO);
        MultiKey mk2 = new MultiKey(ONE, TWO);
        MultiKey mk3 = new MultiKey(ONE, "TWO");
        
        Assert.assertEquals(mk1, mk1);
        Assert.assertEquals(mk1, mk2);
        Assert.assertTrue(mk1.equals(mk3) == false);
        Assert.assertTrue(mk1.equals("") == false);
        Assert.assertTrue(mk1.equals(null) == false);
    }
    
}

Other Commons Collections examples (source code examples)

Here is a short list of links related to this Commons Collections TestMultiKey.java source code file:

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