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checked serialization of BigReal and added a tests suite for the class 

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/math/trunk@795963 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Luc Maisonobe 2009-07-20 19:23:43 +00:00
parent ac01fdfb7a
commit cb545b5bc0
2 changed files with 142 additions and 2 deletions
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16
src/java/org/apache/commons/math/util/BigReal.java
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@ -35,8 +35,6 @@ import org.apache.commons.math.FieldElement;
* @version $Revision$ $Date$
*/
public class BigReal implements FieldElement<BigReal>, Comparable<BigReal>, Serializable {
// TODO: Add Serializable documentation
// TODO: Check Serializable implementation
/** Serializable version identifier. */
private static final long serialVersionUID = 7887631840434052850L;
@ -208,6 +206,20 @@ public class BigReal implements FieldElement<BigReal>, Comparable<BigReal>, Seri
return d.compareTo(a.d);
}
/** Get the double value corresponding to the instance.
* @return double value corresponding to the instance
*/
public double doubleValue() {
return d.doubleValue();
}
/** Get the BigDecimal value corresponding to the instance.
* @return BigDecimal value corresponding to the instance
*/
public BigDecimal bigDecimalValue() {
return d;
}
/** {@inheritDoc} */
@Override
public boolean equals(Object other) {

128
src/test/org/apache/commons/math/util/BigRealTest.java Normal file
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@ -0,0 +1,128 @@
/*
* 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.math.util;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertFalse;
import static org.junit.Assert.assertTrue;
import java.math.BigDecimal;
import java.math.BigInteger;
import java.math.MathContext;
import org.apache.commons.math.TestUtils;
import org.junit.Test;
public class BigRealTest {
@Test
public void testConstructor() {
assertEquals(1.625, new BigReal(new BigDecimal("1.625")).doubleValue(), 1.0e-15);
assertEquals(-5.0, new BigReal(new BigInteger("-5")).doubleValue(), 1.0e-15);
assertEquals(-5.0, new BigReal(new BigInteger("-5"), MathContext.DECIMAL64).doubleValue(), 1.0e-15);
assertEquals(0.125, new BigReal(new BigInteger("125"), 3).doubleValue(), 1.0e-15);
assertEquals(0.125, new BigReal(new BigInteger("125"), 3, MathContext.DECIMAL64).doubleValue(), 1.0e-15);
assertEquals(1.625, new BigReal(new char[] { '1', '.', '6', '2', '5' }).doubleValue(), 1.0e-15);
assertEquals(1.625, new BigReal(new char[] { 'A', 'A', '1', '.', '6', '2', '5', '9' }, 2, 5).doubleValue(), 1.0e-15);
assertEquals(1.625, new BigReal(new char[] { 'A', 'A', '1', '.', '6', '2', '5', '9' }, 2, 5, MathContext.DECIMAL64).doubleValue(), 1.0e-15);
assertEquals(1.625, new BigReal(new char[] { '1', '.', '6', '2', '5' }, MathContext.DECIMAL64).doubleValue(), 1.0e-15);
assertEquals(1.625, new BigReal(1.625).doubleValue(), 1.0e-15);
assertEquals(1.625, new BigReal(1.625, MathContext.DECIMAL64).doubleValue(), 1.0e-15);
assertEquals(-5.0, new BigReal(-5).doubleValue(), 1.0e-15);
assertEquals(-5.0, new BigReal(-5, MathContext.DECIMAL64).doubleValue(), 1.0e-15);
assertEquals(-5.0, new BigReal(-5l).doubleValue(), 1.0e-15);
assertEquals(-5.0, new BigReal(-5l, MathContext.DECIMAL64).doubleValue(), 1.0e-15);
assertEquals(1.625, new BigReal("1.625").doubleValue(), 1.0e-15);
assertEquals(1.625, new BigReal("1.625", MathContext.DECIMAL64).doubleValue(), 1.0e-15);
}
@Test
public void testCompareTo() {
BigReal first = new BigReal(1.0 / 2.0);
BigReal second = new BigReal(1.0 / 3.0);
BigReal third = new BigReal(1.0 / 2.0);
assertEquals(0, first.compareTo(first));
assertEquals(0, first.compareTo(third));
assertEquals(1, first.compareTo(second));
assertEquals(-1, second.compareTo(first));
}
public void testAdd() {
BigReal a = new BigReal("1.2345678");
BigReal b = new BigReal("8.7654321");
assertEquals(9.9999999, a.add(b).doubleValue(), 1.0e-15);
}
public void testSubtract() {
BigReal a = new BigReal("1.2345678");
BigReal b = new BigReal("8.7654321");
assertEquals( -7.5308643, a.subtract(b).doubleValue(), 1.0e-15);
}
public void testDivide() {
BigReal a = new BigReal("1.0000000000");
BigReal b = new BigReal("0.0009765625");
assertEquals(1024.0, a.divide(b).doubleValue(), 1.0e-15);
}
public void testMultiply() {
BigReal a = new BigReal("1024.0");
BigReal b = new BigReal("0.0009765625");
assertEquals(1.0, a.multiply(b).doubleValue(), 1.0e-15);
}
@Test
public void testDoubleValue() {
assertEquals(0.5, new BigReal(0.5).doubleValue(), 1.0e-15);
}
@Test
public void testBigDecimalValue() {
BigDecimal pi = new BigDecimal("3.1415926535897932384626433832795028841971693993751");
assertEquals(pi, new BigReal(pi).bigDecimalValue());
assertEquals(new BigDecimal(0.5), new BigReal(1.0 / 2.0).bigDecimalValue());
}
@Test
public void testEqualsAndHashCode() {
BigReal zero = new BigReal(0.0);
BigReal nullReal = null;
assertTrue(zero.equals(zero));
assertFalse(zero.equals(nullReal));
assertFalse(zero.equals(Double.valueOf(0)));
BigReal zero2 = new BigReal(0.0);
assertTrue(zero.equals(zero2));
assertEquals(zero.hashCode(), zero2.hashCode());
BigReal one = new BigReal(1.0);
assertFalse((one.equals(zero) || zero.equals(one)));
assertTrue(one.equals(BigReal.ONE));
}
public void testSerial() {
BigReal[] Reals = {
new BigReal(3.0), BigReal.ONE, BigReal.ZERO,
new BigReal(17), new BigReal(Math.PI),
new BigReal(-2.5)
};
for (BigReal Real : Reals) {
assertEquals(Real, TestUtils.serializeAndRecover(Real));
}
}
}