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The Apache Commons Math project is a library of lightweight, self-contained mathematics and statistics components addressing the most common practical problems not immediately available in the Java programming language or commons-lang.
/*
* 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.io.Serializable;
import java.math.BigDecimal;
import java.math.BigInteger;
import java.math.MathContext;
import java.math.RoundingMode;
import org.apache.commons.math3.Field;
import org.apache.commons.math3.FieldElement;
import org.apache.commons.math3.exception.MathArithmeticException;
import org.apache.commons.math3.exception.util.LocalizedFormats;
/**
* Arbitrary precision decimal number.
*
* This class is a simple wrapper around the standard BigDecimal
* in order to implement the {@link FieldElement} interface.
*
* @since 2.0
* @version $Id: BigReal.java 1294043 2012-02-27 06:32:59Z celestin $
*/
public class BigReal implements FieldElement, Comparable, Serializable {
/** A big real representing 0. */
public static final BigReal ZERO = new BigReal(BigDecimal.ZERO);
/** A big real representing 1. */
public static final BigReal ONE = new BigReal(BigDecimal.ONE);
/** Serializable version identifier. */
private static final long serialVersionUID = 4984534880991310382L;
/** Underlying BigDecimal. */
private final BigDecimal d;
/** Rounding mode for divisions. **/
private RoundingMode roundingMode = RoundingMode.HALF_UP;
/*** BigDecimal scale ***/
private int scale = 64;
/** Build an instance from a BigDecimal.
* @param val value of the instance
*/
public BigReal(BigDecimal val) {
d = val;
}
/** Build an instance from a BigInteger.
* @param val value of the instance
*/
public BigReal(BigInteger val) {
d = new BigDecimal(val);
}
/** Build an instance from an unscaled BigInteger.
* @param unscaledVal unscaled value
* @param scale scale to use
*/
public BigReal(BigInteger unscaledVal, int scale) {
d = new BigDecimal(unscaledVal, scale);
}
/** Build an instance from an unscaled BigInteger.
* @param unscaledVal unscaled value
* @param scale scale to use
* @param mc to used
*/
public BigReal(BigInteger unscaledVal, int scale, MathContext mc) {
d = new BigDecimal(unscaledVal, scale, mc);
}
/** Build an instance from a BigInteger.
* @param val value of the instance
* @param mc context to use
*/
public BigReal(BigInteger val, MathContext mc) {
d = new BigDecimal(val, mc);
}
/** Build an instance from a characters representation.
* @param in character representation of the value
*/
public BigReal(char[] in) {
d = new BigDecimal(in);
}
/** Build an instance from a characters representation.
* @param in character representation of the value
* @param offset offset of the first character to analyze
* @param len length of the array slice to analyze
*/
public BigReal(char[] in, int offset, int len) {
d = new BigDecimal(in, offset, len);
}
/** Build an instance from a characters representation.
* @param in character representation of the value
* @param offset offset of the first character to analyze
* @param len length of the array slice to analyze
* @param mc context to use
*/
public BigReal(char[] in, int offset, int len, MathContext mc) {
d = new BigDecimal(in, offset, len, mc);
}
/** Build an instance from a characters representation.
* @param in character representation of the value
* @param mc context to use
*/
public BigReal(char[] in, MathContext mc) {
d = new BigDecimal(in, mc);
}
/** Build an instance from a double.
* @param val value of the instance
*/
public BigReal(double val) {
d = new BigDecimal(val);
}
/** Build an instance from a double.
* @param val value of the instance
* @param mc context to use
*/
public BigReal(double val, MathContext mc) {
d = new BigDecimal(val, mc);
}
/** Build an instance from an int.
* @param val value of the instance
*/
public BigReal(int val) {
d = new BigDecimal(val);
}
/** Build an instance from an int.
* @param val value of the instance
* @param mc context to use
*/
public BigReal(int val, MathContext mc) {
d = new BigDecimal(val, mc);
}
/** Build an instance from a long.
* @param val value of the instance
*/
public BigReal(long val) {
d = new BigDecimal(val);
}
/** Build an instance from a long.
* @param val value of the instance
* @param mc context to use
*/
public BigReal(long val, MathContext mc) {
d = new BigDecimal(val, mc);
}
/** Build an instance from a String representation.
* @param val character representation of the value
*/
public BigReal(String val) {
d = new BigDecimal(val);
}
/** Build an instance from a String representation.
* @param val character representation of the value
* @param mc context to use
*/
public BigReal(String val, MathContext mc) {
d = new BigDecimal(val, mc);
}
/***
* Gets the rounding mode for division operations
* The default is {@code RoundingMode.HALF_UP}
* @return the rounding mode.
* @since 2.1
*/
public RoundingMode getRoundingMode() {
return roundingMode;
}
/***
* Sets the rounding mode for decimal divisions.
* @param roundingMode rounding mode for decimal divisions
* @since 2.1
*/
public void setRoundingMode(RoundingMode roundingMode) {
this.roundingMode = roundingMode;
}
/***
* Sets the scale for division operations.
* The default is 64
* @return the scale
* @since 2.1
*/
public int getScale() {
return scale;
}
/***
* Sets the scale for division operations.
* @param scale scale for division operations
* @since 2.1
*/
public void setScale(int scale) {
this.scale = scale;
}
/** {@inheritDoc} */
public BigReal add(BigReal a) {
return new BigReal(d.add(a.d));
}
/** {@inheritDoc} */
public BigReal subtract(BigReal a) {
return new BigReal(d.subtract(a.d));
}
/** {@inheritDoc} */
public BigReal negate() {
return new BigReal(d.negate());
}
/**
* {@inheritDoc}
*
* @throws MathArithmeticException if {@code a} is zero
*/
public BigReal divide(BigReal a) {
try {
return new BigReal(d.divide(a.d, scale, roundingMode));
} catch (ArithmeticException e) {
// Division by zero has occured
throw new MathArithmeticException(LocalizedFormats.ZERO_NOT_ALLOWED);
}
}
/**
* {@inheritDoc}
*
* @throws MathArithmeticException if {@code this} is zero
*/
public BigReal reciprocal() {
try {
return new BigReal(BigDecimal.ONE.divide(d, scale, roundingMode));
} catch (ArithmeticException e) {
// Division by zero has occured
throw new MathArithmeticException(LocalizedFormats.ZERO_NOT_ALLOWED);
}
}
/** {@inheritDoc} */
public BigReal multiply(BigReal a) {
return new BigReal(d.multiply(a.d));
}
/** {@inheritDoc} */
public BigReal multiply(final int n) {
return new BigReal(d.multiply(new BigDecimal(n)));
}
/** {@inheritDoc} */
public int compareTo(BigReal a) {
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) {
if (this == other){
return true;
}
if (other instanceof BigReal){
return d.equals(((BigReal) other).d);
}
return false;
}
/** {@inheritDoc} */
@Override
public int hashCode() {
return d.hashCode();
}
/** {@inheritDoc} */
public Field getField() {
return BigRealField.getInstance();
}
}