/*
* Copyright 2003-2010 the original author or authors.
*
* Licensed 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.codehaus.groovy.runtime.typehandling;
import java.math.BigDecimal;
import java.math.MathContext;
/**
* BigDecimal NumberMath operations
*
* @author Steve Goetze
*/
public final class BigDecimalMath extends NumberMath {
// This is an arbitrary value, picked as a reasonable choice for a precision
// for typical user math when a non-terminating result would otherwise occur.
public static final int DIVISION_EXTRA_PRECISION = 10;
//This is an arbitrary value, picked as a reasonable choice for a rounding point
//for typical user math.
public static final int DIVISION_MIN_SCALE = 10;
public static final BigDecimalMath INSTANCE = new BigDecimalMath();
private BigDecimalMath() {
}
protected Number absImpl(Number number) {
return toBigDecimal(number).abs();
}
public Number addImpl(Number left, Number right) {
return toBigDecimal(left).add(toBigDecimal(right));
}
public Number subtractImpl(Number left, Number right) {
return toBigDecimal(left).subtract(toBigDecimal(right));
}
public Number multiplyImpl(Number left, Number right) {
return toBigDecimal(left).multiply(toBigDecimal(right));
}
public Number divideImpl(Number left, Number right) {
BigDecimal bigLeft = toBigDecimal(left);
BigDecimal bigRight = toBigDecimal(right);
try {
return bigLeft.divide(bigRight);
} catch (ArithmeticException e) {
// set a DEFAULT precision if otherwise non-terminating
int precision = Math.max(bigLeft.precision(), bigRight.precision()) + DIVISION_EXTRA_PRECISION;
BigDecimal result = bigLeft.divide(bigRight, new MathContext(precision));
int scale = Math.max(Math.max(bigLeft.scale(), bigRight.scale()), DIVISION_MIN_SCALE);
if (result.scale() > scale) result = result.setScale(scale, BigDecimal.ROUND_HALF_UP);
return result;
}
}
public int compareToImpl(Number left, Number right) {
return toBigDecimal(left).compareTo(toBigDecimal(right));
}
protected Number unaryMinusImpl(Number left) {
return toBigDecimal(left).negate();
}
}