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Java example source code file (ResizableDoubleArrayTest.java)

This example Java source code file (ResizableDoubleArrayTest.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.

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Java - Java tags/keywords

arrayindexoutofboundsexception, expecting, illegalargumentexception, initial, integerdistribution, number, override, resizabledoublearray, suppresswarnings, test, the, trying, uniformintegerdistribution, you

The ResizableDoubleArrayTest.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 org.apache.commons.math3.distribution.IntegerDistribution;
import org.apache.commons.math3.distribution.UniformIntegerDistribution;

import org.junit.After;
import org.junit.Assert;
import org.junit.Before;
import org.junit.Test;


/**
 * This class contains test cases for the ResizableDoubleArray.
 *
 */
public class ResizableDoubleArrayTest extends DoubleArrayAbstractTest {

    @After
    public void tearDown() throws Exception {
        da = null;
        ra = null;
    }

    @Before
    public void setUp() throws Exception {
        da = new ResizableDoubleArray();
        ra = new ResizableDoubleArray();
    }

    @SuppressWarnings("deprecation")
    @Test
    public void testConstructors() {
        float defaultExpansionFactor = 2.0f;
        double defaultContractionCriteria = 2.5;
        int defaultMode = ResizableDoubleArray.MULTIPLICATIVE_MODE;

        ResizableDoubleArray testDa = new ResizableDoubleArray(2);
        Assert.assertEquals(0, testDa.getNumElements());
        Assert.assertEquals(2, testDa.getCapacity());
        Assert.assertEquals(defaultExpansionFactor, testDa.getExpansionFactor(), 0);
        Assert.assertEquals(defaultContractionCriteria, testDa.getContractionCriterion(), 0);
        Assert.assertEquals(defaultMode, testDa.getExpansionMode());
        try {
            da = new ResizableDoubleArray(-1);
            Assert.fail("Expecting IllegalArgumentException");
        } catch (IllegalArgumentException ex) {
            // expected
        }

        testDa = new ResizableDoubleArray((double[]) null);
        Assert.assertEquals(0, testDa.getNumElements());

        double[] initialArray = new double[] { 0, 1, 2 };
        testDa = new ResizableDoubleArray(initialArray);
        Assert.assertEquals(3, testDa.getNumElements());

        testDa = new ResizableDoubleArray(2, 2.0);
        Assert.assertEquals(0, testDa.getNumElements());
        Assert.assertEquals(2, testDa.getCapacity());
        Assert.assertEquals(defaultExpansionFactor, testDa.getExpansionFactor(), 0);
        Assert.assertEquals(defaultContractionCriteria, testDa.getContractionCriterion(), 0);
        Assert.assertEquals(defaultMode, testDa.getExpansionMode());

        try {
            da = new ResizableDoubleArray(2, 0.5);
            Assert.fail("Expecting IllegalArgumentException");
        } catch (IllegalArgumentException ex) {
            // expected
        }

        testDa = new ResizableDoubleArray(2, 3.0);
        Assert.assertEquals(3.0f, testDa.getExpansionFactor(), 0);
        Assert.assertEquals(3.5f, testDa.getContractionCriterion(), 0);

        testDa = new ResizableDoubleArray(2, 2.0, 3.0);
        Assert.assertEquals(0, testDa.getNumElements());
        Assert.assertEquals(2, testDa.getCapacity());
        Assert.assertEquals(defaultExpansionFactor, testDa.getExpansionFactor(), 0);
        Assert.assertEquals(3.0f, testDa.getContractionCriterion(), 0);
        Assert.assertEquals(defaultMode, testDa.getExpansionMode());

        try {
            da = new ResizableDoubleArray(2, 2.0, 1.5);
            Assert.fail("Expecting IllegalArgumentException");
        } catch (IllegalArgumentException ex) {
            // expected
        }

        testDa = new ResizableDoubleArray(2, 2.0, 3.0,
                ResizableDoubleArray.ExpansionMode.ADDITIVE);
        Assert.assertEquals(0, testDa.getNumElements());
        Assert.assertEquals(2, testDa.getCapacity());
        Assert.assertEquals(defaultExpansionFactor, testDa.getExpansionFactor(), 0);
        Assert.assertEquals(3.0f, testDa.getContractionCriterion(), 0);
        Assert.assertEquals(ResizableDoubleArray.ADDITIVE_MODE,
                testDa.getExpansionMode());

        try {
            da = new ResizableDoubleArray(2, 2.0f, 2.5f, -1);
            Assert.fail("Expecting IllegalArgumentException");
        } catch (IllegalArgumentException ex) {
            // expected
        }

        // Copy constructor
        testDa = new ResizableDoubleArray(2, 2.0, 3.0,
                                          ResizableDoubleArray.ExpansionMode.ADDITIVE);
        testDa.addElement(2.0);
        testDa.addElement(3.2);
        ResizableDoubleArray copyDa = new ResizableDoubleArray(testDa);
        Assert.assertEquals(copyDa, testDa);
        Assert.assertEquals(testDa, copyDa);

        // JIRA: MATH-1252
        final double[] values = {1};
        testDa = new ResizableDoubleArray(values);
        Assert.assertArrayEquals(values, testDa.getElements(), 0);
        Assert.assertEquals(1, testDa.getNumElements());
        Assert.assertEquals(1, testDa.getElement(0), 0);

    }


    @Test
    public void testSetElementArbitraryExpansion1() {

        // MULTIPLICATIVE_MODE
        da.addElement(2.0);
        da.addElement(4.0);
        da.addElement(6.0);
        da.setElement(1, 3.0);

        // Expand the array arbitrarily to 1000 items
        da.setElement(1000, 3.4);

        Assert.assertEquals( "The number of elements should now be 1001, it isn't",
                da.getNumElements(), 1001);

        Assert.assertEquals( "Uninitialized Elements are default value of 0.0, index 766 wasn't", 0.0,
                da.getElement( 760 ), Double.MIN_VALUE );

        Assert.assertEquals( "The 1000th index should be 3.4, it isn't", 3.4, da.getElement(1000),
                Double.MIN_VALUE );
        Assert.assertEquals( "The 0th index should be 2.0, it isn't", 2.0, da.getElement(0),
                Double.MIN_VALUE);
    }

    @Test
    public void testSetElementArbitraryExpansion2() {
        // Make sure numElements and expansion work correctly for expansion boundary cases
        da.addElement(2.0);
        da.addElement(4.0);
        da.addElement(6.0);
        Assert.assertEquals(16, ((ResizableDoubleArray) da).getCapacity());
        Assert.assertEquals(3, da.getNumElements());
        da.setElement(3, 7.0);
        Assert.assertEquals(16, ((ResizableDoubleArray) da).getCapacity());
        Assert.assertEquals(4, da.getNumElements());
        da.setElement(10, 10.0);
        Assert.assertEquals(16, ((ResizableDoubleArray) da).getCapacity());
        Assert.assertEquals(11, da.getNumElements());
        da.setElement(9, 10.0);
        Assert.assertEquals(16, ((ResizableDoubleArray) da).getCapacity());
        Assert.assertEquals(11, da.getNumElements());

        try {
            da.setElement(-2, 3);
            Assert.fail("Expecting ArrayIndexOutOfBoundsException for negative index");
        } catch (ArrayIndexOutOfBoundsException ex) {
            // expected
        }

        // ADDITIVE_MODE

        ResizableDoubleArray testDa = new ResizableDoubleArray(2, 2.0, 3.0,
                                                               ResizableDoubleArray.ExpansionMode.ADDITIVE);
        Assert.assertEquals(2, testDa.getCapacity());
        testDa.addElement(1d);
        testDa.addElement(1d);
        Assert.assertEquals(2, testDa.getCapacity());
        testDa.addElement(1d);
        Assert.assertEquals(4, testDa.getCapacity());
    }

    @Override
    @Test
    public void testAdd1000() {
        super.testAdd1000();
        Assert.assertEquals("Internal Storage length should be 1024 if we started out with initial capacity of " +
                "16 and an expansion factor of 2.0",
                1024, ((ResizableDoubleArray) da).getCapacity());
    }

    @Test
    public void testAddElements() {
        ResizableDoubleArray testDa = new ResizableDoubleArray();

        // MULTIPLICATIVE_MODE
        testDa.addElements(new double[] {4, 5, 6});
        Assert.assertEquals(3, testDa.getNumElements(), 0);
        Assert.assertEquals(4, testDa.getElement(0), 0);
        Assert.assertEquals(5, testDa.getElement(1), 0);
        Assert.assertEquals(6, testDa.getElement(2), 0);

        testDa.addElements(new double[] {4, 5, 6});
        Assert.assertEquals(6, testDa.getNumElements());

        // ADDITIVE_MODE  (x's are occupied storage locations, 0's are open)
        testDa = new ResizableDoubleArray(2, 2.0, 2.5,
                                          ResizableDoubleArray.ExpansionMode.ADDITIVE);
        Assert.assertEquals(2, testDa.getCapacity());
        testDa.addElements(new double[] { 1d }); // x,0
        testDa.addElements(new double[] { 2d }); // x,x
        testDa.addElements(new double[] { 3d }); // x,x,x,0 -- expanded
        Assert.assertEquals(1d, testDa.getElement(0), 0);
        Assert.assertEquals(2d, testDa.getElement(1), 0);
        Assert.assertEquals(3d, testDa.getElement(2), 0);
        Assert.assertEquals(4, testDa.getCapacity());  // x,x,x,0
        Assert.assertEquals(3, testDa.getNumElements());
    }

    @Override
    @Test
    public void testAddElementRolling() {
        super.testAddElementRolling();

        // MULTIPLICATIVE_MODE
        da.clear();
        da.addElement(1);
        da.addElement(2);
        da.addElementRolling(3);
        Assert.assertEquals(3, da.getElement(1), 0);
        da.addElementRolling(4);
        Assert.assertEquals(3, da.getElement(0), 0);
        Assert.assertEquals(4, da.getElement(1), 0);
        da.addElement(5);
        Assert.assertEquals(5, da.getElement(2), 0);
        da.addElementRolling(6);
        Assert.assertEquals(4, da.getElement(0), 0);
        Assert.assertEquals(5, da.getElement(1), 0);
        Assert.assertEquals(6, da.getElement(2), 0);

        // ADDITIVE_MODE  (x's are occupied storage locations, 0's are open)
        ResizableDoubleArray testDa = new ResizableDoubleArray(2, 2.0, 2.5,
                                                               ResizableDoubleArray.ExpansionMode.ADDITIVE);
        Assert.assertEquals(2, testDa.getCapacity());
        testDa.addElement(1d); // x,0
        testDa.addElement(2d); // x,x
        testDa.addElement(3d); // x,x,x,0 -- expanded
        Assert.assertEquals(1d, testDa.getElement(0), 0);
        Assert.assertEquals(2d, testDa.getElement(1), 0);
        Assert.assertEquals(3d, testDa.getElement(2), 0);
        Assert.assertEquals(4, testDa.getCapacity());  // x,x,x,0
        Assert.assertEquals(3, testDa.getNumElements());
        testDa.addElementRolling(4d);
        Assert.assertEquals(2d, testDa.getElement(0), 0);
        Assert.assertEquals(3d, testDa.getElement(1), 0);
        Assert.assertEquals(4d, testDa.getElement(2), 0);
        Assert.assertEquals(4, testDa.getCapacity());  // 0,x,x,x
        Assert.assertEquals(3, testDa.getNumElements());
        testDa.addElementRolling(5d);   // 0,0,x,x,x,0 -- time to contract
        Assert.assertEquals(3d, testDa.getElement(0), 0);
        Assert.assertEquals(4d, testDa.getElement(1), 0);
        Assert.assertEquals(5d, testDa.getElement(2), 0);
        Assert.assertEquals(4, testDa.getCapacity());  // contracted -- x,x,x,0
        Assert.assertEquals(3, testDa.getNumElements());
        try {
            testDa.getElement(4);
            Assert.fail("Expecting ArrayIndexOutOfBoundsException");
        } catch (ArrayIndexOutOfBoundsException ex) {
            // expected
        }
        try {
            testDa.getElement(-1);
            Assert.fail("Expecting ArrayIndexOutOfBoundsException");
        } catch (ArrayIndexOutOfBoundsException ex) {
            // expected
        }
    }

    @Test
    public void testSetNumberOfElements() {
        da.addElement( 1.0 );
        da.addElement( 1.0 );
        da.addElement( 1.0 );
        da.addElement( 1.0 );
        da.addElement( 1.0 );
        da.addElement( 1.0 );
        Assert.assertEquals( "Number of elements should equal 6", da.getNumElements(), 6);

        ((ResizableDoubleArray) da).setNumElements( 3 );
        Assert.assertEquals( "Number of elements should equal 3", da.getNumElements(), 3);

        try {
            ((ResizableDoubleArray) da).setNumElements( -3 );
            Assert.fail( "Setting number of elements to negative should've thrown an exception");
        } catch( IllegalArgumentException iae ) {
        }

        ((ResizableDoubleArray) da).setNumElements(1024);
        Assert.assertEquals( "Number of elements should now be 1024", da.getNumElements(), 1024);
        Assert.assertEquals( "Element 453 should be a default double", da.getElement( 453 ), 0.0, Double.MIN_VALUE);

    }

    @Test
    public void testWithInitialCapacity() {

        ResizableDoubleArray eDA2 = new ResizableDoubleArray(2);
        Assert.assertEquals("Initial number of elements should be 0", 0, eDA2.getNumElements());

        final IntegerDistribution randomData = new UniformIntegerDistribution(100, 1000);
        final int iterations = randomData.sample();

        for( int i = 0; i < iterations; i++) {
            eDA2.addElement( i );
        }

        Assert.assertEquals("Number of elements should be equal to " + iterations, iterations, eDA2.getNumElements());

        eDA2.addElement( 2.0 );

        Assert.assertEquals("Number of elements should be equals to " + (iterations +1),
                iterations + 1 , eDA2.getNumElements() );
    }

    @SuppressWarnings("deprecation")
    @Test
    public void testWithInitialCapacityAndExpansionFactor() {

        ResizableDoubleArray eDA3 = new ResizableDoubleArray(3, 3.0, 3.5);
        Assert.assertEquals("Initial number of elements should be 0", 0, eDA3.getNumElements() );

        final IntegerDistribution randomData = new UniformIntegerDistribution(100, 3000);
        final int iterations = randomData.sample();

        for( int i = 0; i < iterations; i++) {
            eDA3.addElement( i );
        }

        Assert.assertEquals("Number of elements should be equal to " + iterations, iterations,eDA3.getNumElements());

        eDA3.addElement( 2.0 );

        Assert.assertEquals("Number of elements should be equals to " + (iterations +1),
                iterations +1, eDA3.getNumElements() );

        Assert.assertEquals("Expansion factor should equal 3.0", 3.0f, eDA3.getExpansionFactor(), Double.MIN_VALUE);
    }

    @Test
    public void testDiscard() {
        da.addElement(2.0);
        da.addElement(2.0);
        da.addElement(2.0);
        da.addElement(2.0);
        da.addElement(2.0);
        da.addElement(2.0);
        da.addElement(2.0);
        da.addElement(2.0);
        da.addElement(2.0);
        da.addElement(2.0);
        da.addElement(2.0);
        Assert.assertEquals( "Number of elements should be 11", 11, da.getNumElements());

        ((ResizableDoubleArray)da).discardFrontElements(5);
        Assert.assertEquals( "Number of elements should be 6", 6, da.getNumElements());

        da.addElement(2.0);
        da.addElement(2.0);
        da.addElement(2.0);
        da.addElement(2.0);
        Assert.assertEquals( "Number of elements should be 10", 10, da.getNumElements());

        ((ResizableDoubleArray)da).discardMostRecentElements(2);
        Assert.assertEquals( "Number of elements should be 8", 8, da.getNumElements());

        try {
            ((ResizableDoubleArray)da).discardFrontElements(-1);
            Assert.fail( "Trying to discard a negative number of element is not allowed");
        } catch( Exception e ){
        }

        try {
            ((ResizableDoubleArray)da).discardMostRecentElements(-1);
            Assert.fail( "Trying to discard a negative number of element is not allowed");
        } catch( Exception e ){
        }

        try {
            ((ResizableDoubleArray)da).discardFrontElements( 10000 );
            Assert.fail( "You can't discard more elements than the array contains");
        } catch( Exception e ){
        }

        try {
            ((ResizableDoubleArray)da).discardMostRecentElements( 10000 );
            Assert.fail( "You can't discard more elements than the array contains");
        } catch( Exception e ){
        }

    }

    @Test
    public void testSubstitute() {

        da.addElement(2.0);
        da.addElement(2.0);
        da.addElement(2.0);
        da.addElement(2.0);
        da.addElement(2.0);
        da.addElement(2.0);
        da.addElement(2.0);
        da.addElement(2.0);
        da.addElement(2.0);
        da.addElement(2.0);
        da.addElement(2.0);
        Assert.assertEquals( "Number of elements should be 11", 11, da.getNumElements());

        ((ResizableDoubleArray)da).substituteMostRecentElement(24);

        Assert.assertEquals( "Number of elements should be 11", 11, da.getNumElements());

        try {
            ((ResizableDoubleArray)da).discardMostRecentElements(10);
        } catch( Exception e ){
            Assert.fail( "Trying to discard a negative number of element is not allowed");
        }

        ((ResizableDoubleArray)da).substituteMostRecentElement(24);

        Assert.assertEquals( "Number of elements should be 1", 1, da.getNumElements());

    }

    @SuppressWarnings("deprecation")
    @Test
    public void testMutators() {
        ((ResizableDoubleArray)da).setContractionCriteria(10f);
        Assert.assertEquals(10f, ((ResizableDoubleArray)da).getContractionCriterion(), 0);
        ((ResizableDoubleArray)da).setExpansionFactor(8f);
        Assert.assertEquals(8f, ((ResizableDoubleArray)da).getExpansionFactor(), 0);
        try {
            ((ResizableDoubleArray)da).setExpansionFactor(11f);  // greater than contractionCriteria
            Assert.fail("Expecting IllegalArgumentException");
        } catch (IllegalArgumentException ex) {
            // expected
        }
        ((ResizableDoubleArray)da).setExpansionMode(
                ResizableDoubleArray.ADDITIVE_MODE);
        Assert.assertEquals(ResizableDoubleArray.ADDITIVE_MODE,
                ((ResizableDoubleArray)da).getExpansionMode());
        try {
            ((ResizableDoubleArray)da).setExpansionMode(-1);
            Assert.fail("Expecting IllegalArgumentException");
        } catch (IllegalArgumentException ex) {
            // expected
        }
    }

    @Test
    public void testEqualsAndHashCode() throws Exception {

        // Wrong type
        ResizableDoubleArray first = new ResizableDoubleArray();
        Double other = new Double(2);
        Assert.assertFalse(first.equals(other));

        // Null
        other = null;
        Assert.assertFalse(first.equals(other));

        // Reflexive
        Assert.assertTrue(first.equals(first));

        // Argumentless constructor
        ResizableDoubleArray second = new ResizableDoubleArray();
        verifyEquality(first, second);

        // Equals iff same data, same properties
        ResizableDoubleArray third = new ResizableDoubleArray(3, 2.0, 2.0);
        verifyInequality(third, first);
        ResizableDoubleArray fourth = new ResizableDoubleArray(3, 2.0, 2.0);
        ResizableDoubleArray fifth = new ResizableDoubleArray(2, 2.0, 2.0);
        verifyEquality(third, fourth);
        verifyInequality(third, fifth);
        third.addElement(4.1);
        third.addElement(4.2);
        third.addElement(4.3);
        fourth.addElement(4.1);
        fourth.addElement(4.2);
        fourth.addElement(4.3);
        verifyEquality(third, fourth);

        // expand
        fourth.addElement(4.4);
        verifyInequality(third, fourth);
        third.addElement(4.4);
        verifyEquality(third, fourth);
        fourth.addElement(4.4);
        verifyInequality(third, fourth);
        third.addElement(4.4);
        verifyEquality(third, fourth);
        fourth.addElementRolling(4.5);
        third.addElementRolling(4.5);
        verifyEquality(third, fourth);

        // discard
        third.discardFrontElements(1);
        verifyInequality(third, fourth);
        fourth.discardFrontElements(1);
        verifyEquality(third, fourth);

        // discard recent
        third.discardMostRecentElements(2);
        fourth.discardMostRecentElements(2);
        verifyEquality(third, fourth);

        // wrong order
        third.addElement(18);
        fourth.addElement(17);
        third.addElement(17);
        fourth.addElement(18);
        verifyInequality(third, fourth);

        // copy
        ResizableDoubleArray.copy(fourth, fifth);
        verifyEquality(fourth, fifth);

        // Copy constructor
        verifyEquality(fourth, new ResizableDoubleArray(fourth));

        // Instance copy
        verifyEquality(fourth, fourth.copy());

    }

    @Test
    public void testGetArrayRef() {
        final ResizableDoubleArray a = new ResizableDoubleArray();

        // Modify "a" through the public API.
        final int index = 20;
        final double v1 = 1.2;
        a.setElement(index, v1);

        // Modify the internal storage through the protected API.
        final double v2 = v1 + 3.4;
        final double[] aInternalArray = a.getArrayRef();
        aInternalArray[a.getStartIndex() + index] = v2;

        Assert.assertEquals(v2, a.getElement(index), 0d);
    }

    @Test
    public void testCompute() {
        final ResizableDoubleArray a = new ResizableDoubleArray();
        final int max = 20;
        for (int i = 1; i <= max; i++) {
            a.setElement(i, i);
        }

        final MathArrays.Function add = new MathArrays.Function() {
                public double evaluate(double[] a, int index, int num) {
                    double sum = 0;
                    final int max = index + num;
                    for (int i = index; i < max; i++) {
                        sum += a[i];
                    }
                    return sum;
                }
                public double evaluate(double[] a) {
                    return evaluate(a, 0, a.length);
                }
            };

        final double sum = a.compute(add);
        Assert.assertEquals(0.5 * max * (max + 1), sum, 0);
    }

    private void verifyEquality(ResizableDoubleArray a, ResizableDoubleArray b) {
        Assert.assertTrue(b.equals(a));
        Assert.assertTrue(a.equals(b));
        Assert.assertEquals(a.hashCode(), b.hashCode());
    }

    private void verifyInequality(ResizableDoubleArray a, ResizableDoubleArray b) {
        Assert.assertFalse(b.equals(a));
        Assert.assertFalse(a.equals(b));
        Assert.assertFalse(a.hashCode() == b.hashCode());
    }

}

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