Java example source code file (ComparatorTest.java)

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

Learn more about this Java project at its project page.

Java - Java tags/keywords

comparatortest, exception, failed, got, illegalargumentexception, management, nullpointerexception, objectname, string, test

The ComparatorTest.java Java example source code

/*
 * Copyright (c) 2005, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */

/*
 * @test
 * @bug 5036680
 * @summary Test the ObjectName.compareTo() method.
 * @author Luis-Miguel Alventosa
 * @run clean ComparatorTest
 * @run build ComparatorTest
 * @run main ComparatorTest
 */

import javax.management.*;

public class ComparatorTest {

    private static final char LT = '<';
    private static final char EQ = '=';
    private static final char GT = '>';

    private static final String tests[][] = {
        //
        // domains
        //
        { String.valueOf(LT), ":k1=v1", "d:k1=v1" },
        { String.valueOf(EQ), "d:k1=v1", "d:k1=v1" },
        { String.valueOf(GT), "d2:k1=v1", "d1:k1=v1" },
        //
        // "type=" key property
        //
        { String.valueOf(GT), "d:type=a,k1=v1", "d:k1=v1" },
        { String.valueOf(GT), "d:type=a,k1=v1", "d:type=" },
        { String.valueOf(GT), "d:type=a,k1=v1", "d:type=,k1=v1" },
        { String.valueOf(LT), "d:type=a,k1=v1", "d:type=b,k1=v1" },
        { String.valueOf(LT), "d:type=a,k2=v2", "d:type=b,k1=v1" },
        //
        // canonical form
        //
        { String.valueOf(EQ), "d:k1=v1,k2=v2", "d:k2=v2,k1=v1" },
        { String.valueOf(LT), "d:k1=v1,k2=v2", "d:k1=v1,k3=v3" },
        { String.valueOf(LT), "d:k1=v1,k2=v2", "d:k2=v2,k1=v1,k3=v3" },
        //
        // wildcards
        //
        { String.valueOf(LT), "d:k1=v1", "d:k1=v1,*" },
        { String.valueOf(GT), "d:k1=v1,k2=v2", "d:k1=v1,*" },
        { String.valueOf(GT), "domain:k1=v1", "?:k1=v1" },
        { String.valueOf(GT), "domain:k1=v1", "*:k1=v1" },
        { String.valueOf(GT), "domain:k1=v1", "domai?:k1=v1" },
        { String.valueOf(GT), "domain:k1=v1", "domai*:k1=v1" },
        { String.valueOf(GT), "domain:k1=v1", "do?ain:k1=v1" },
        { String.valueOf(GT), "domain:k1=v1", "do*ain:k1=v1" },
    };

    private static boolean compare(char comparator, String on1, String on2) {
        boolean ok = false;
        System.out.println("Test " + on1 + " " + comparator + " " + on2);
        try {
            ObjectName o1 = ObjectName.getInstance(on1);
            ObjectName o2 = ObjectName.getInstance(on2);
            int result = o1.compareTo(o2);
            switch (comparator) {
                case LT:
                    if (result < 0)
                        ok = true;
                    break;
                case EQ:
                    if (result == 0)
                        ok = true;
                    break;
                case GT:
                    if (result > 0)
                        ok = true;
                    break;
                default:
                    throw new IllegalArgumentException(
                              "Test incorrect: case: " + comparator);
            }
        } catch (Exception e) {
            ok = false;
            System.out.println("Got Unexpected Exception = " + e.toString());
        }
        return ok;
    }

    private static boolean lessThan(String on1, String on2) {
        return compare(LT, on1, on2);
    }

    private static boolean equalTo(String on1, String on2) {
        return compare(EQ, on1, on2);
    }

    private static boolean greaterThan(String on1, String on2) {
        return compare(GT, on1, on2);
    }

    private static int runTest(char comparator, String on1, String on2) {
        System.out.println("----------------------------------------------");
        boolean ok = false;
        boolean lt = lessThan(on1, on2);
        boolean eq = equalTo(on1, on2);
        boolean gt = greaterThan(on1, on2);
        switch (comparator) {
            case LT:
                ok = lt && !eq && !gt;
                System.out.println("Comparison result: LessThan");
                break;
            case EQ:
                ok = !lt && eq && !gt;
                System.out.println("Comparison result: EqualTo");
                break;
            case GT:
                ok = !lt && !eq && gt;
                System.out.println("Comparison result: GreaterThan");
                break;
            default:
                throw new IllegalArgumentException(
                          "Test incorrect: case: " + comparator);
        }
        if (ok)
            System.out.println("Test passed!");
        else
            System.out.println("Test failed!");
        System.out.println("----------------------------------------------");
        return ok ? 0 : 1;
    }

    public static void main(String[] args) throws Exception {

        int error = 0;

        // Check null values
        //
        System.out.println("----------------------------------------------");
        System.out.println("Test ObjectName.compareTo(null)");
        try {
            new ObjectName("d:k=v").compareTo(null);
            error++;
            System.out.println("Didn't get expected NullPointerException!");
            System.out.println("Test failed!");
        } catch (NullPointerException e) {
            System.out.println("Got expected exception = " + e.toString());
            System.out.println("Test passed!");
        } catch (Exception e) {
            error++;
            System.out.println("Got unexpected exception = " + e.toString());
            System.out.println("Test failed!");
        }
        System.out.println("----------------------------------------------");

        // Compare ObjectNames
        //
        for (int i = 0; i < tests.length; i++)
            error += runTest(tests[i][0].charAt(0), tests[i][1], tests[i][2]);

        if (error > 0) {
            final String msg = "Test FAILED! Got " + error + " error(s)";
            System.out.println(msg);
            throw new IllegalArgumentException(msg);
        } else {
            System.out.println("Test PASSED!");
        }
    }
}