Bug4170614Test.java

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/*
    (this test doesn't have an at-test tag because it's run by a shell
    script instead of directly by the test harness)
*/

/*
 *
 *
 * (C) Copyright Taligent, Inc. 1996, 1997 - All Rights Reserved
 * (C) Copyright IBM Corp. 1996 - 1998 - All Rights Reserved
 *
 * Portions copyright (c) 2007 Sun Microsystems, Inc.
 * All Rights Reserved.
 *
 * The original version of this source code and documentation
 * is copyrighted and owned by Taligent, Inc., a wholly-owned
 * subsidiary of IBM. These materials are provided under terms
 * of a License Agreement between Taligent and Sun. This technology
 * is protected by multiple US and International patents.
 *
 * This notice and attribution to Taligent may not be removed.
 * Taligent is a registered trademark of Taligent, Inc.
 *
 * Permission to use, copy, modify, and distribute this software
 * and its documentation for NON-COMMERCIAL purposes and without
 * fee is hereby granted provided that this copyright notice
 * appears in all copies. Please refer to the file "copyright.html"
 * for further important copyright and licensing information.
 *
 * SUN MAKES NO REPRESENTATIONS OR WARRANTIES ABOUT THE SUITABILITY OF
 * THE SOFTWARE, EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED
 * TO THE IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
 * PARTICULAR PURPOSE, OR NON-INFRINGEMENT. SUN SHALL NOT BE LIABLE FOR
 * ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR
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 */
package java.text;
import sun.text.IntHashtable;


/**
 * This class tests some internal hashCode() functions.
 * Bug #4170614 complained that we had two iternal classes that
 * break the invariant that if a.equals(b) than a.hashCode() ==
 * b.hashCode().  This is because these classes overrode equals()
 * but not hashCode().  These are both purely internal classes, and
 * the library itself doesn't actually call hashCode(), so this isn't
 * actually causing anyone problems yet.  But if these classes are
 * ever exposed in the API, their hashCode() methods need to work right.
 * PatternEntry will never be exposed in the API, but IntHashtable
 * might be.  This is a shell test to allow us to access classes that
 * are declared package private.
 * @author Richard Gillam
 */
public class Bug4170614Test {
    public static void main(String[] args) throws Exception {
        testIntHashtable();
        testPatternEntry();
    }


    public static void testIntHashtable() throws Exception {
        IntHashtable fred = new IntHashtable();
        fred.put(1, 10);
        fred.put(2, 20);
        fred.put(3, 30);

        IntHashtable barney = new IntHashtable();
        barney.put(1, 10);
        barney.put(3, 30);
        barney.put(2, 20);

        IntHashtable homer = new IntHashtable();
        homer.put(3, 30);
        homer.put(1, 10);
        homer.put(7, 900);

        if (fred.equals(barney)) {
            System.out.println("fred.equals(barney)");
        }
        else {
            System.out.println("!fred.equals(barney)");
        }
        System.out.println("fred.hashCode() == " + fred.hashCode());
        System.out.println("barney.hashCode() == " + barney.hashCode());

        if (!fred.equals(barney)) {
            throw new Exception("equals() failed on two hashtables that are equal");
        }

        if (fred.hashCode() != barney.hashCode()) {
           throw new Exception("hashCode() failed on two hashtables that are equal");
        }

        System.out.println();
        if (fred.equals(homer)) {
            System.out.println("fred.equals(homer)");
        }
        else {
            System.out.println("!fred.equals(homer)");
        }
        System.out.println("fred.hashCode() == " + fred.hashCode());
        System.out.println("homer.hashCode() == " + homer.hashCode());

        if (fred.equals(homer)) {
            throw new Exception("equals() failed on two hashtables that are not equal");
        }

        if (fred.hashCode() == homer.hashCode()) {
            throw new Exception("hashCode() failed on two hashtables that are not equal");
        }

        System.out.println();
        System.out.println("testIntHashtable() passed.\n");
    }

    public static void testPatternEntry() throws Exception {
        PatternEntry fred = new PatternEntry(1,
                                             new StringBuffer("hello"),
                                             new StringBuffer("up"));
        PatternEntry barney = new PatternEntry(1,
                                               new StringBuffer("hello"),
                                               new StringBuffer("down"));
        // (equals() only considers the "chars" field, so fred and barney are equal)
        PatternEntry homer = new PatternEntry(1,
                                              new StringBuffer("goodbye"),
                                              new StringBuffer("up"));

        if (fred.equals(barney)) {
            System.out.println("fred.equals(barney)");
        }
        else {
            System.out.println("!fred.equals(barney)");
        }
        System.out.println("fred.hashCode() == " + fred.hashCode());
        System.out.println("barney.hashCode() == " + barney.hashCode());

        if (!fred.equals(barney)) {
            throw new Exception("equals() failed on two hashtables that are equal");
        }

        if (fred.hashCode() != barney.hashCode()) {
           throw new Exception("hashCode() failed on two hashtables that are equal");
        }

        System.out.println();
        if (fred.equals(homer)) {
            System.out.println("fred.equals(homer)");
        }
        else {
            System.out.println("!fred.equals(homer)");
        }
        System.out.println("fred.hashCode() == " + fred.hashCode());
        System.out.println("homer.hashCode() == " + homer.hashCode());

        if (fred.equals(homer)) {
            throw new Exception("equals() failed on two hashtables that are not equal");
        }

        if (fred.hashCode() == homer.hashCode()) {
            throw new Exception("hashCode() failed on two hashtables that are not equal");
        }

        System.out.println();
        System.out.println("testPatternEntry() passed.\n");
    }
}