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1.3.2
by Torsten Werner
Import upstream version 1.6.3 |
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/*
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* Copyright 2003-2007 the original author or authors.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package org.codehaus.groovy.runtime.typehandling; |
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import java.math.BigDecimal; |
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/**
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* BigDecimal NumberMath operations
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*
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* @author Steve Goetze
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*/
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public class BigDecimalMath extends NumberMath { |
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//This is an arbitrary value, picked as a reasonable choice for a rounding point
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//for typical user math.
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public static final int MAX_DIVISION_SCALE = 10; |
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public static final BigDecimalMath INSTANCE = new BigDecimalMath(); |
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private BigDecimalMath() {} |
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protected Number absImpl(Number number) { |
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return toBigDecimal(number).abs(); |
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}
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public Number addImpl(Number left, Number right) { |
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return toBigDecimal(left).add(toBigDecimal(right)); |
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}
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public Number subtractImpl(Number left, Number right) { |
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return toBigDecimal(left).subtract(toBigDecimal(right)); |
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}
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public Number multiplyImpl(Number left, Number right) { |
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return toBigDecimal(left).multiply(toBigDecimal(right)); |
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}
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public Number divideImpl(Number left, Number right) { |
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//Hack until Java 1.5 BigDecimal is available. For now, pick
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//a result scale which is the maximum of the scale of the
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//two operands and an arbitrary maximum (similar to what a
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//handheld calculator would do). Then, normalize the result
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//by removing any trailing zeros.
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BigDecimal bigLeft = toBigDecimal(left); |
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BigDecimal bigRight = toBigDecimal(right); |
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int scale = Math.max(bigLeft.scale(), bigRight.scale()); |
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return normalize(bigLeft.divide(bigRight, Math.max(scale, MAX_DIVISION_SCALE), BigDecimal.ROUND_HALF_UP)); |
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}
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public int compareToImpl(Number left, Number right) { |
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return toBigDecimal(left).compareTo(toBigDecimal(right)); |
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}
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private BigDecimal normalize(BigDecimal number) { |
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// we have to take care of the case number==0, because 0 can have every
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// scale and the test in the while loop would never end
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if (number.signum()==0) { |
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// the smallest scale for 0 is 0
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return number.setScale(0); |
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}
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// rescale until we found the smallest possible scale
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try { |
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while (true) { |
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number = number.setScale(number.scale()-1); |
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}
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} catch (ArithmeticException e) { |
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return number; |
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}
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}
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protected Number unaryMinusImpl(Number left) { |
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return toBigDecimal(left).negate(); |
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}
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}
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