Commons Collections example source code file (TestBooleanComparator.java)

This example Commons Collections source code file (TestBooleanComparator.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

boolean, booleancomparator, booleancomparator, classcast, classcastexception, classcastexception, expected, expected, integer, list, nullpointer, nullpointerexception, nullpointerexception, testbooleancomparator, util

The Commons Collections TestBooleanComparator.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.util.ArrayList;
import java.util.Comparator;
import java.util.List;

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

/**
 * Tests for {@link BooleanComparator}.
 * 
 * @version $Revision: 646780 $ $Date: 2008-04-10 13:48:07 +0100 (Thu, 10 Apr 2008) $
 * 
 * @author Rodney Waldhoff
 */
public class TestBooleanComparator extends AbstractTestComparator {

    // conventional
    // ------------------------------------------------------------------------

    public TestBooleanComparator(String testName) {
        super(testName);
    }

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

    // collections testing framework
    // ------------------------------------------------------------------------

    public Comparator makeComparator() {
        return new BooleanComparator();
    }

    public List getComparableObjectsOrdered() {
        List list = new ArrayList();
        list.add(new Boolean(false));
        list.add(Boolean.FALSE);
        list.add(new Boolean(false));
        list.add(Boolean.TRUE);
        list.add(new Boolean(true));
        list.add(Boolean.TRUE);
        return list;
    }
    
    public String getCompatibilityVersion() {
        return "3";
    }

    // tests
    // ------------------------------------------------------------------------

    public void testConstructors() {
        allTests(false,new BooleanComparator());
        allTests(false,new BooleanComparator(false));
        allTests(true,new BooleanComparator(true));        
    }
    
    public void testStaticFactoryMethods() {
        allTests(false,BooleanComparator.getFalseFirstComparator());
        allTests(false,BooleanComparator.getBooleanComparator(false));
        allTests(true,BooleanComparator.getTrueFirstComparator());
        allTests(true,BooleanComparator.getBooleanComparator(true));
    }
    
    public void testEqualsCompatibleInstance() {
        assertEquals(new BooleanComparator(),new BooleanComparator(false));
        assertEquals(new BooleanComparator(false),new BooleanComparator(false));
        assertEquals(new BooleanComparator(false),BooleanComparator.getFalseFirstComparator());
        assertSame(BooleanComparator.getFalseFirstComparator(),BooleanComparator.getBooleanComparator(false));

        assertEquals(new BooleanComparator(true),new BooleanComparator(true));
        assertEquals(new BooleanComparator(true),BooleanComparator.getTrueFirstComparator());
        assertSame(BooleanComparator.getTrueFirstComparator(),BooleanComparator.getBooleanComparator(true));

        assertTrue(!(new BooleanComparator().equals(new BooleanComparator(true))));
        assertTrue(!(new BooleanComparator(true).equals(new BooleanComparator(false))));
    }
    
    // utilities
    // ------------------------------------------------------------------------

    protected void allTests(boolean trueFirst, BooleanComparator comp) {
        orderIndependentTests(comp);
        if(trueFirst) {
            trueFirstTests(comp);
        } else {
            falseFirstTests(comp);
        }
    }

    protected void trueFirstTests(BooleanComparator comp) {
        assertNotNull(comp);
        assertEquals(0,comp.compare(Boolean.TRUE,Boolean.TRUE));
        assertEquals(0,comp.compare(Boolean.FALSE,Boolean.FALSE));
        assertTrue(comp.compare(Boolean.FALSE,Boolean.TRUE) > 0);
        assertTrue(comp.compare(Boolean.TRUE,Boolean.FALSE) < 0);

        assertEquals(0,comp.compare((Object)(Boolean.TRUE),(Object)(Boolean.TRUE)));
        assertEquals(0,comp.compare((Object)(Boolean.FALSE),(Object)(Boolean.FALSE)));
        assertTrue(comp.compare((Object)(Boolean.FALSE),(Object)(Boolean.TRUE)) > 0);
        assertTrue(comp.compare((Object)(Boolean.TRUE),(Object)(Boolean.FALSE)) < 0);
    }

    protected void falseFirstTests(BooleanComparator comp) {
        assertNotNull(comp);
        assertEquals(0,comp.compare(Boolean.TRUE,Boolean.TRUE));
        assertEquals(0,comp.compare(Boolean.FALSE,Boolean.FALSE));
        assertTrue(comp.compare(Boolean.FALSE,Boolean.TRUE) < 0);
        assertTrue(comp.compare(Boolean.TRUE,Boolean.FALSE) > 0);

        assertEquals(0,comp.compare((Object)(Boolean.TRUE),(Object)(Boolean.TRUE)));
        assertEquals(0,comp.compare((Object)(Boolean.FALSE),(Object)(Boolean.FALSE)));
        assertTrue(comp.compare((Object)(Boolean.FALSE),(Object)(Boolean.TRUE)) < 0);
        assertTrue(comp.compare((Object)(Boolean.TRUE),(Object)(Boolean.FALSE)) > 0);
    }

    protected void orderIndependentTests(BooleanComparator comp) {
        nullArgumentTests(comp);
        nonBooleanArgumentTests(comp);
        nullAndNonBooleanArgumentsTests(comp);
    }
    
    protected void nullArgumentTests(BooleanComparator comp) {
        assertNotNull(comp);
        try {
            comp.compare(null,null);
            fail("Expected NullPointerException");
        } catch(NullPointerException e) {
            // expected
        }
        try {
            comp.compare(Boolean.TRUE,null);
            fail("Expected NullPointerException");
        } catch(NullPointerException e) {
            // expected
        }
        try {
            comp.compare(Boolean.FALSE,null);
            fail("Expected NullPointerException");
        } catch(NullPointerException e) {
            // expected
        }
        try {
            comp.compare(null,Boolean.TRUE);
            fail("Expected NullPointerException");
        } catch(NullPointerException e) {
            // expected
        }
        try {
            comp.compare(null,Boolean.FALSE);
            fail("Expected NullPointerException");
        } catch(NullPointerException e) {
            // expected
        }
    }
    
    protected void nonBooleanArgumentTests(BooleanComparator comp) {
        assertNotNull(comp);
        try {
            comp.compare("string","string");
            fail("Expected ClassCastException");
        } catch(ClassCastException e) {
            // expected
        }
        try {
            comp.compare(Boolean.TRUE,"string");
            fail("Expected ClassCastException");
        } catch(ClassCastException e) {
            // expected
        }
        try {
            comp.compare("string",Boolean.TRUE);
            fail("Expected ClassCastException");
        } catch(ClassCastException e) {
            // expected
        }
        try {
            comp.compare("string",new Integer(3));
            fail("Expected ClassCastException");
        } catch(ClassCastException e) {
            // expected
        }
        try {
            comp.compare(new Integer(3),"string");
            fail("Expected ClassCastException");
        } catch(ClassCastException e) {
            // expected
        }
    }
    
    protected void nullAndNonBooleanArgumentsTests(BooleanComparator comp) {
        assertNotNull(comp);
        try {
            comp.compare(null,"string");
            fail("Expected ClassCast or NullPointer Exception");
        } catch(ClassCastException e) {
            // expected
        } catch(NullPointerException e) {
            // expected
        }
        try {
            comp.compare("string",null);
            fail("Expected ClassCast or NullPointer Exception");
        } catch(ClassCastException e) {
            // expected
        } catch(NullPointerException e) {
            // expected
        }
    }

}