Commons Math example source code file (ResizableDoubleArrayTest.java)
The Commons Math ResizableDoubleArrayTest.java source code/*
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* http://www.apache.org/licenses/LICENSE-2.0
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* Unless required by applicable law or agreed to in writing, software
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package org.apache.commons.math.util;
import org.apache.commons.math.random.RandomDataImpl;
import org.apache.commons.math.random.RandomData;
/**
* This class contains test cases for the ResizableDoubleArray.
*
* @version $Revision: 811685 $ $Date: 2009-09-05 13:36:48 -0400 (Sat, 05 Sep 2009) $
*/
public class ResizableDoubleArrayTest extends DoubleArrayAbstractTest {
public ResizableDoubleArrayTest(String name) {
super( name );
}
@Override
protected void tearDown() throws Exception {
da = null;
ra = null;
}
@Override
protected void setUp() throws Exception {
da = new ResizableDoubleArray();
ra = new ResizableDoubleArray();
}
public void testConstructors() {
float defaultExpansionFactor = 2.0f;
float defaultContractionCriteria = 2.5f;
int defaultMode = ResizableDoubleArray.MULTIPLICATIVE_MODE;
ResizableDoubleArray testDa = new ResizableDoubleArray(2);
assertEquals(0, testDa.getNumElements());
assertEquals(2, testDa.getInternalLength());
assertEquals(defaultExpansionFactor, testDa.getExpansionFactor(), 0);
assertEquals(defaultContractionCriteria, testDa.getContractionCriteria(), 0);
assertEquals(defaultMode, testDa.getExpansionMode());
try {
da = new ResizableDoubleArray(-1);
fail("Expecting IllegalArgumentException");
} catch (IllegalArgumentException ex) {
// expected
}
testDa = new ResizableDoubleArray(2, 2.0f);
assertEquals(0, testDa.getNumElements());
assertEquals(2, testDa.getInternalLength());
assertEquals(defaultExpansionFactor, testDa.getExpansionFactor(), 0);
assertEquals(defaultContractionCriteria, testDa.getContractionCriteria(), 0);
assertEquals(defaultMode, testDa.getExpansionMode());
try {
da = new ResizableDoubleArray(2, 0.5f);
fail("Expecting IllegalArgumentException");
} catch (IllegalArgumentException ex) {
// expected
}
testDa = new ResizableDoubleArray(2, 3.0f);
assertEquals(3.0f, testDa.getExpansionFactor(), 0);
assertEquals(3.5f, testDa.getContractionCriteria(), 0);
testDa = new ResizableDoubleArray(2, 2.0f, 3.0f);
assertEquals(0, testDa.getNumElements());
assertEquals(2, testDa.getInternalLength());
assertEquals(defaultExpansionFactor, testDa.getExpansionFactor(), 0);
assertEquals(3.0f, testDa.getContractionCriteria(), 0);
assertEquals(defaultMode, testDa.getExpansionMode());
try {
da = new ResizableDoubleArray(2, 2.0f, 1.5f);
fail("Expecting IllegalArgumentException");
} catch (IllegalArgumentException ex) {
// expected
}
testDa = new ResizableDoubleArray(2, 2.0f, 3.0f,
ResizableDoubleArray.ADDITIVE_MODE);
assertEquals(0, testDa.getNumElements());
assertEquals(2, testDa.getInternalLength());
assertEquals(defaultExpansionFactor, testDa.getExpansionFactor(), 0);
assertEquals(3.0f, testDa.getContractionCriteria(), 0);
assertEquals(ResizableDoubleArray.ADDITIVE_MODE,
testDa.getExpansionMode());
try {
da = new ResizableDoubleArray(2, 2.0f, 2.5f, -1);
fail("Expecting IllegalArgumentException");
} catch (IllegalArgumentException ex) {
// expected
}
// Copy constructor
testDa = new ResizableDoubleArray(2, 2.0f, 3.0f,
ResizableDoubleArray.ADDITIVE_MODE);
testDa.addElement(2.0);
testDa.addElement(3.2);
ResizableDoubleArray copyDa = new ResizableDoubleArray(testDa);
assertEquals(copyDa, testDa);
assertEquals(testDa, copyDa);
}
public void testSetElementArbitraryExpansion() {
// 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);
assertEquals( "The number of elements should now be 1001, it isn't",
da.getNumElements(), 1001);
assertEquals( "Uninitialized Elements are default value of 0.0, index 766 wasn't", 0.0,
da.getElement( 760 ), Double.MIN_VALUE );
assertEquals( "The 1000th index should be 3.4, it isn't", 3.4, da.getElement(1000),
Double.MIN_VALUE );
assertEquals( "The 0th index should be 2.0, it isn't", 2.0, da.getElement(0),
Double.MIN_VALUE);
// Make sure numElements and expansion work correctly for expansion boundary cases
da.clear();
da.addElement(2.0);
da.addElement(4.0);
da.addElement(6.0);
assertEquals(4, ((ResizableDoubleArray) da).getInternalLength());
assertEquals(3, da.getNumElements());
da.setElement(3, 7.0);
assertEquals(4, ((ResizableDoubleArray) da).getInternalLength());
assertEquals(4, da.getNumElements());
da.setElement(10, 10.0);
assertEquals(11, ((ResizableDoubleArray) da).getInternalLength());
assertEquals(11, da.getNumElements());
da.setElement(9, 10.0);
assertEquals(11, ((ResizableDoubleArray) da).getInternalLength());
assertEquals(11, da.getNumElements());
try {
da.setElement(-2, 3);
fail("Expecting ArrayIndexOutOfBoundsException for negative index");
} catch (ArrayIndexOutOfBoundsException ex) {
// expected
}
// ADDITIVE_MODE
ResizableDoubleArray testDa = new ResizableDoubleArray(2, 2.0f, 3.0f,
ResizableDoubleArray.ADDITIVE_MODE);
assertEquals(2, testDa.getInternalLength());
testDa.addElement(1d);
testDa.addElement(1d);
assertEquals(2, testDa.getInternalLength());
testDa.addElement(1d);
assertEquals(4, testDa.getInternalLength());
}
@Override
public void testAdd1000() {
super.testAdd1000();
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).getInternalLength());
}
@Override
public void testAddElementRolling() {
super.testAddElementRolling();
// MULTIPLICATIVE_MODE
da.clear();
da.addElement(1);
da.addElement(2);
da.addElementRolling(3);
assertEquals(3, da.getElement(1), 0);
da.addElementRolling(4);
assertEquals(3, da.getElement(0), 0);
assertEquals(4, da.getElement(1), 0);
da.addElement(5);
assertEquals(5, da.getElement(2), 0);
da.addElementRolling(6);
assertEquals(4, da.getElement(0), 0);
assertEquals(5, da.getElement(1), 0);
assertEquals(6, da.getElement(2), 0);
// ADDITIVE_MODE (x's are occupied storage locations, 0's are open)
ResizableDoubleArray testDa = new ResizableDoubleArray(2, 2.0f, 2.5f,
ResizableDoubleArray.ADDITIVE_MODE);
assertEquals(2, testDa.getInternalLength());
testDa.addElement(1d); // x,0
testDa.addElement(2d); // x,x
testDa.addElement(3d); // x,x,x,0 -- expanded
assertEquals(1d, testDa.getElement(0), 0);
assertEquals(2d, testDa.getElement(1), 0);
assertEquals(3d, testDa.getElement(2), 0);
assertEquals(4, testDa.getInternalLength()); // x,x,x,0
assertEquals(3, testDa.getNumElements());
testDa.addElementRolling(4d);
assertEquals(2d, testDa.getElement(0), 0);
assertEquals(3d, testDa.getElement(1), 0);
assertEquals(4d, testDa.getElement(2), 0);
assertEquals(4, testDa.getInternalLength()); // 0,x,x,x
assertEquals(3, testDa.getNumElements());
testDa.addElementRolling(5d); // 0,0,x,x,x,0 -- time to contract
assertEquals(3d, testDa.getElement(0), 0);
assertEquals(4d, testDa.getElement(1), 0);
assertEquals(5d, testDa.getElement(2), 0);
assertEquals(4, testDa.getInternalLength()); // contracted -- x,x,x,0
assertEquals(3, testDa.getNumElements());
try {
testDa.getElement(4);
fail("Expecting ArrayIndexOutOfBoundsException");
} catch (ArrayIndexOutOfBoundsException ex) {
// expected
}
try {
testDa.getElement(-1);
fail("Expecting ArrayIndexOutOfBoundsException");
} catch (ArrayIndexOutOfBoundsException ex) {
// expected
}
}
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 );
assertEquals( "Number of elements should equal 6", da.getNumElements(), 6);
((ResizableDoubleArray) da).setNumElements( 3 );
assertEquals( "Number of elements should equal 3", da.getNumElements(), 3);
try {
((ResizableDoubleArray) da).setNumElements( -3 );
fail( "Setting number of elements to negative should've thrown an exception");
} catch( IllegalArgumentException iae ) {
}
((ResizableDoubleArray) da).setNumElements(1024);
assertEquals( "Number of elements should now be 1024", da.getNumElements(), 1024);
assertEquals( "Element 453 should be a default double", da.getElement( 453 ), 0.0, Double.MIN_VALUE);
}
public void testWithInitialCapacity() {
ResizableDoubleArray eDA2 = new ResizableDoubleArray(2);
assertEquals("Initial number of elements should be 0", 0, eDA2.getNumElements());
RandomData randomData = new RandomDataImpl();
int iterations = randomData.nextInt(100, 1000);
for( int i = 0; i < iterations; i++) {
eDA2.addElement( i );
}
assertEquals("Number of elements should be equal to " + iterations, iterations, eDA2.getNumElements());
eDA2.addElement( 2.0 );
assertEquals("Number of elements should be equals to " + (iterations +1),
iterations + 1 , eDA2.getNumElements() );
}
public void testWithInitialCapacityAndExpansionFactor() {
ResizableDoubleArray eDA3 = new ResizableDoubleArray(3, 3.0f, 3.5f);
assertEquals("Initial number of elements should be 0", 0, eDA3.getNumElements() );
RandomData randomData = new RandomDataImpl();
int iterations = randomData.nextInt(100, 3000);
for( int i = 0; i < iterations; i++) {
eDA3.addElement( i );
}
assertEquals("Number of elements should be equal to " + iterations, iterations,eDA3.getNumElements());
eDA3.addElement( 2.0 );
assertEquals("Number of elements should be equals to " + (iterations +1),
iterations +1, eDA3.getNumElements() );
assertEquals("Expansion factor should equal 3.0", 3.0f, eDA3.getExpansionFactor(), Double.MIN_VALUE);
}
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);
assertEquals( "Number of elements should be 11", 11, da.getNumElements());
((ResizableDoubleArray)da).discardFrontElements(5);
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);
assertEquals( "Number of elements should be 10", 10, da.getNumElements());
((ResizableDoubleArray)da).discardMostRecentElements(2);
assertEquals( "Number of elements should be 8", 8, da.getNumElements());
try {
((ResizableDoubleArray)da).discardFrontElements(-1);
fail( "Trying to discard a negative number of element is not allowed");
} catch( Exception e ){
}
try {
((ResizableDoubleArray)da).discardMostRecentElements(-1);
fail( "Trying to discard a negative number of element is not allowed");
} catch( Exception e ){
}
try {
((ResizableDoubleArray)da).discardFrontElements( 10000 );
fail( "You can't discard more elements than the array contains");
} catch( Exception e ){
}
try {
((ResizableDoubleArray)da).discardMostRecentElements( 10000 );
fail( "You can't discard more elements than the array contains");
} catch( Exception e ){
}
}
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);
assertEquals( "Number of elements should be 11", 11, da.getNumElements());
((ResizableDoubleArray)da).substituteMostRecentElement(24);
assertEquals( "Number of elements should be 11", 11, da.getNumElements());
try {
((ResizableDoubleArray)da).discardMostRecentElements(10);
} catch( Exception e ){
fail( "Trying to discard a negative number of element is not allowed");
}
((ResizableDoubleArray)da).substituteMostRecentElement(24);
assertEquals( "Number of elements should be 1", 1, da.getNumElements());
}
public void testMutators() {
((ResizableDoubleArray)da).setContractionCriteria(10f);
assertEquals(10f, ((ResizableDoubleArray)da).getContractionCriteria(), 0);
((ResizableDoubleArray)da).setExpansionFactor(8f);
assertEquals(8f, ((ResizableDoubleArray)da).getExpansionFactor(), 0);
try {
((ResizableDoubleArray)da).setExpansionFactor(11f); // greater than contractionCriteria
fail("Expecting IllegalArgumentException");
} catch (IllegalArgumentException ex) {
// expected
}
((ResizableDoubleArray)da).setExpansionMode(
ResizableDoubleArray.ADDITIVE_MODE);
assertEquals(ResizableDoubleArray.ADDITIVE_MODE,
((ResizableDoubleArray)da).getExpansionMode());
try {
((ResizableDoubleArray)da).setExpansionMode(-1);
fail ("Expecting IllegalArgumentException");
} catch (IllegalArgumentException ex) {
// expected
}
}
public void testEqualsAndHashCode() throws Exception {
// Wrong type
ResizableDoubleArray first = new ResizableDoubleArray();
Double other = new Double(2);
assertFalse(first.equals(other));
// Null
other = null;
assertFalse(first.equals(other));
// Reflexive
assertTrue(first.equals(first));
// Argumentless constructor
ResizableDoubleArray second = new ResizableDoubleArray();
verifyEquality(first, second);
// Equals iff same data, same properties
ResizableDoubleArray third = new ResizableDoubleArray(3, 2.0f, 2.0f);
verifyInequality(third, first);
ResizableDoubleArray fourth = new ResizableDoubleArray(3, 2.0f, 2.0f);
ResizableDoubleArray fifth = new ResizableDoubleArray(2, 2.0f, 2.0f);
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());
}
private void verifyEquality(ResizableDoubleArray a, ResizableDoubleArray b) {
assertTrue(b.equals(a));
assertTrue(a.equals(b));
assertEquals(a.hashCode(), b.hashCode());
}
private void verifyInequality(ResizableDoubleArray a, ResizableDoubleArray b) {
assertFalse(b.equals(a));
assertFalse(a.equals(b));
assertFalse(a.hashCode() == b.hashCode());
}
}
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