com.espertech.esper.collection.TestNumberSetPermutationEnumeration.java Source code

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Here is the source code for com.espertech.esper.collection.TestNumberSetPermutationEnumeration.java

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/*
 * *************************************************************************************
 *  Copyright (C) 2008 EsperTech, Inc. All rights reserved.                            *
 *  http://esper.codehaus.org                                                          *
 *  http://www.espertech.com                                                           *
 *  ---------------------------------------------------------------------------------- *
 *  The software in this package is published under the terms of the GPL license       *
 *  a copy of which has been included with this distribution in the license.txt file.  *
 * *************************************************************************************
 */

package com.espertech.esper.collection;

import junit.framework.TestCase;
import java.util.Arrays;
import java.util.NoSuchElementException;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

public class TestNumberSetPermutationEnumeration extends TestCase {
    public void testInvalid() {
        try {
            new PermutationEnumeration(0);
            fail();
        } catch (IllegalArgumentException ex) {
            // expected
        }
    }

    public void testNext() {
        final int[] numberSet = new int[] { 10, 11, 12 };
        final int[][] expectedValues = new int[][] { { 10, 11, 12 }, { 10, 12, 11 }, { 11, 10, 12 }, { 11, 12, 10 },
                { 12, 10, 11 }, { 12, 11, 10 } };
        tryPermutation(numberSet, expectedValues);
    }

    private void tryPermutation(int[] numberSet, int[][] expectedValues) {
        NumberSetPermutationEnumeration enumeration = new NumberSetPermutationEnumeration(numberSet);

        int count = 0;
        while (enumeration.hasMoreElements()) {
            int[] result = enumeration.nextElement();
            int[] expected = expectedValues[count];

            log.debug(".tryPermutation result=" + Arrays.toString(result));
            log.debug(".tryPermutation expected=" + Arrays.toString(expected));

            count++;
            assertTrue("Mismatch in count=" + count, Arrays.equals(result, expected));
        }
        assertEquals(count, expectedValues.length);

        try {
            enumeration.nextElement();
            fail();
        } catch (NoSuchElementException ex) {
            // Expected
        }
    }

    private static Log log = LogFactory.getLog(TestNumberSetPermutationEnumeration.class);
}