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Java example source code file (MultidimensionalCounterTest.java)

This example Java source code file (MultidimensionalCounterTest.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

dimensionmismatchexception, indexoutofboundsexception, multidimensionalcounter, multidimensionalcountertest, notstrictlypositiveexception, outofrangeexception, test, too, util, wrong

The MultidimensionalCounterTest.java Java example 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.math3.util;

import java.util.NoSuchElementException;
import org.apache.commons.math3.exception.DimensionMismatchException;
import org.apache.commons.math3.exception.OutOfRangeException;
import org.apache.commons.math3.exception.NotStrictlyPositiveException;
import org.junit.Assert;
import org.junit.Test;

/**
 * Test cases for the {@link MultidimensionalCounter} class.
 *
 */
public class MultidimensionalCounterTest {
    @Test
    public void testPreconditions() {
        MultidimensionalCounter c;

        try {
            c = new MultidimensionalCounter(0, 1);
            Assert.fail("NotStrictlyPositiveException expected");
        } catch (NotStrictlyPositiveException e) {
            // Expected.
        }
        try {
            c = new MultidimensionalCounter(2, 0);
            Assert.fail("NotStrictlyPositiveException expected");
        } catch (NotStrictlyPositiveException e) {
            // Expected.
        }
        try {
            c = new MultidimensionalCounter(-1, 1);
            Assert.fail("NotStrictlyPositiveException expected");
        } catch (NotStrictlyPositiveException e) {
            // Expected.
        }

        c = new MultidimensionalCounter(2, 3);
        try {
            c.getCount(1, 1, 1);
            Assert.fail("DimensionMismatchException expected");
        } catch (DimensionMismatchException e) {
            // Expected.
        }
        try {
            c.getCount(3, 1);
            Assert.fail("OutOfRangeException expected");
        } catch (OutOfRangeException e) {
            // Expected.
        }
        try {
            c.getCount(0, -1);
            Assert.fail("OutOfRangeException expected");
        } catch (OutOfRangeException e) {
            // Expected.
        }
        try {
            c.getCounts(-1);
            Assert.fail("OutOfRangeException expected");
        } catch (OutOfRangeException e) {
            // Expected.
        }
        try {
            c.getCounts(6);
            Assert.fail("OutOfRangeException expected");
        } catch (OutOfRangeException e) {
            // Expected.
        }
    }

    @Test
    public void testIteratorPreconditions() {
        MultidimensionalCounter.Iterator iter = (new MultidimensionalCounter(2, 3)).iterator();
        try {
            iter.getCount(-1);
            Assert.fail("IndexOutOfBoundsException expected");
        } catch (IndexOutOfBoundsException e) {
            // Expected.
        }
        try {
            iter.getCount(2);
            Assert.fail("IndexOutOfBoundsException expected");
        } catch (IndexOutOfBoundsException e) {
            // Expected.
        }
    }

    @Test
    public void testIterator() {
        final int dim1 = 3;
        final int dim2 = 4;

        final MultidimensionalCounter.Iterator iter
            = new MultidimensionalCounter(dim1, dim2).iterator();

        final int max = dim1 * dim2;
        for (int i = 0; i < max; i++) {
            Assert.assertTrue(iter.hasNext());

            // Should not throw.
            iter.next();
        }

        Assert.assertFalse(iter.hasNext());
    }

    @Test(expected=NoSuchElementException.class)
    public void testIteratorNoMoreElements() {
        final MultidimensionalCounter.Iterator iter
            = new MultidimensionalCounter(4, 2).iterator();

        while (iter.hasNext()) {
            iter.next();
        }

        // No more elements: should throw.
        iter.next();
    }

    @Test
    public void testMulti2UniConversion() {
        final MultidimensionalCounter c = new MultidimensionalCounter(2, 4, 5);
        Assert.assertEquals(c.getCount(1, 2, 3), 33);
    }

    @Test
    public void testAccessors() {
        final int[] originalSize = new int[] {2, 6, 5};
        final MultidimensionalCounter c = new MultidimensionalCounter(originalSize);
        final int nDim = c.getDimension();
        Assert.assertEquals(nDim, originalSize.length);

        final int[] size = c.getSizes();
        for (int i = 0; i < nDim; i++) {
            Assert.assertEquals(originalSize[i], size[i]);
        }
    }

    @Test
    public void testIterationConsistency() {
        final MultidimensionalCounter c = new MultidimensionalCounter(2, 3, 4);
        final int[][] expected = new int[][] {
            { 0, 0, 0 },
            { 0, 0, 1 },
            { 0, 0, 2 },
            { 0, 0, 3 },
            { 0, 1, 0 },
            { 0, 1, 1 },
            { 0, 1, 2 },
            { 0, 1, 3 },
            { 0, 2, 0 },
            { 0, 2, 1 },
            { 0, 2, 2 },
            { 0, 2, 3 },
            { 1, 0, 0 },
            { 1, 0, 1 },
            { 1, 0, 2 },
            { 1, 0, 3 },
            { 1, 1, 0 },
            { 1, 1, 1 },
            { 1, 1, 2 },
            { 1, 1, 3 },
            { 1, 2, 0 },
            { 1, 2, 1 },
            { 1, 2, 2 },
            { 1, 2, 3 }
        };

        final int totalSize = c.getSize();
        Assert.assertEquals(expected.length, totalSize);

        final int nDim = c.getDimension();
        final MultidimensionalCounter.Iterator iter = c.iterator();
        for (int i = 0; i < totalSize; i++) {
            if (!iter.hasNext()) {
                Assert.fail("Too short");
            }
            final int uniDimIndex = iter.next().intValue();
            Assert.assertEquals("Wrong iteration at " + i, i, uniDimIndex);

            for (int dimIndex = 0; dimIndex < nDim; dimIndex++) {
                Assert.assertEquals("Wrong multidimensional index for [" + i + "][" + dimIndex + "]",
                                    expected[i][dimIndex], iter.getCount(dimIndex));
            }

            Assert.assertEquals("Wrong unidimensional index for [" + i + "]",
                                c.getCount(expected[i]), uniDimIndex);

            final int[] indices = c.getCounts(uniDimIndex);
            for (int dimIndex = 0; dimIndex < nDim; dimIndex++) {
                Assert.assertEquals("Wrong multidimensional index for [" + i + "][" + dimIndex + "]",
                                    expected[i][dimIndex], indices[dimIndex]);
            }
        }

        if (iter.hasNext()) {
            Assert.fail("Too long");
        }
    }
}

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