1adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project/* 2adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * Licensed to the Apache Software Foundation (ASF) under one or more 3adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * contributor license agreements. See the NOTICE file distributed with 4adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * this work for additional information regarding copyright ownership. 5adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * The ASF licenses this file to You under the Apache License, Version 2.0 6adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * (the "License"); you may not use this file except in compliance with 7adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * the License. You may obtain a copy of the License at 8adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * 9adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * http://www.apache.org/licenses/LICENSE-2.0 10adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * 11adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * Unless required by applicable law or agreed to in writing, software 12adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * distributed under the License is distributed on an "AS IS" BASIS, 13adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 14adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * See the License for the specific language governing permissions and 15adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * limitations under the License. 16adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project */ 17adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project 18adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Projectpackage java.math; 19adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project 20adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Projectimport java.io.IOException; 21adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Projectimport java.io.ObjectInputStream; 22adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Projectimport java.io.Serializable; 23adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Projectimport java.io.StreamCorruptedException; 24adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project 25adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project/** 26adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * Immutable objects describing settings such as rounding mode and digit 27adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * precision for the numerical operations provided by class {@link BigDecimal}. 28adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project */ 29adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Projectpublic final class MathContext implements Serializable { 3088dc8b7ade1887f0926f1b6b89eea3a79353ff7dElliott Hughes private static final long serialVersionUID = 5579720004786848255L; 31adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project 32adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project /** 33dc915c69ba2495dd2cf965d16058d0b13762142cElliott Hughes * A {@code MathContext} which corresponds to the <a href="http://en.wikipedia.org/wiki/IEEE_754-1985">IEEE 754</a> quadruple 34adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * decimal precision format: 34 digit precision and 35adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * {@link RoundingMode#HALF_EVEN} rounding. 36adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project */ 3788dc8b7ade1887f0926f1b6b89eea3a79353ff7dElliott Hughes public static final MathContext DECIMAL128 = new MathContext(34, RoundingMode.HALF_EVEN); 38adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project 39adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project /** 40dc915c69ba2495dd2cf965d16058d0b13762142cElliott Hughes * A {@code MathContext} which corresponds to the <a href="http://en.wikipedia.org/wiki/IEEE_754-1985">IEEE 754</a> single decimal 41adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * precision format: 7 digit precision and {@link RoundingMode#HALF_EVEN} 42adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * rounding. 43adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project */ 4488dc8b7ade1887f0926f1b6b89eea3a79353ff7dElliott Hughes public static final MathContext DECIMAL32 = new MathContext(7, RoundingMode.HALF_EVEN); 45adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project 46adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project /** 47dc915c69ba2495dd2cf965d16058d0b13762142cElliott Hughes * A {@code MathContext} which corresponds to the <a href="http://en.wikipedia.org/wiki/IEEE_754-1985">IEEE 754</a> double decimal 48adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * precision format: 16 digit precision and {@link RoundingMode#HALF_EVEN} 49adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * rounding. 50adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project */ 5188dc8b7ade1887f0926f1b6b89eea3a79353ff7dElliott Hughes public static final MathContext DECIMAL64 = new MathContext(16, RoundingMode.HALF_EVEN); 52adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project 53adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project /** 54adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * A {@code MathContext} for unlimited precision with 55adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * {@link RoundingMode#HALF_UP} rounding. 56adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project */ 5788dc8b7ade1887f0926f1b6b89eea3a79353ff7dElliott Hughes public static final MathContext UNLIMITED = new MathContext(0, RoundingMode.HALF_UP); 58adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project 59adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project /** 60adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * The number of digits to be used for an operation; results are rounded to 61adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * this precision. 62adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project */ 6388dc8b7ade1887f0926f1b6b89eea3a79353ff7dElliott Hughes private final int precision; 64adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project 65adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project /** 66adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * A {@code RoundingMode} object which specifies the algorithm to be used 67adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * for rounding. 68adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project */ 6988dc8b7ade1887f0926f1b6b89eea3a79353ff7dElliott Hughes private final RoundingMode roundingMode; 70adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project 71adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project /** 72adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * Constructs a new {@code MathContext} with the specified precision and 73adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * with the rounding mode {@link RoundingMode#HALF_UP HALF_UP}. If the 74adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * precision passed is zero, then this implies that the computations have to 75adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * be performed exact, the rounding mode in this case is irrelevant. 767cf86eabacd844cae438db573d45727d7b3374bfJesse Wilson * 77adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * @param precision 78adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * the precision for the new {@code MathContext}. 79adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * @throws IllegalArgumentException 80adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * if {@code precision < 0}. 81adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project */ 82adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project public MathContext(int precision) { 83adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project this(precision, RoundingMode.HALF_UP); 84adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project } 85adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project 86adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project /** 87adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * Constructs a new {@code MathContext} with the specified precision and 88adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * with the specified rounding mode. If the precision passed is zero, then 89adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * this implies that the computations have to be performed exact, the 90adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * rounding mode in this case is irrelevant. 917cf86eabacd844cae438db573d45727d7b3374bfJesse Wilson * 92adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * @param precision 93adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * the precision for the new {@code MathContext}. 94adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * @param roundingMode 95adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * the rounding mode for the new {@code MathContext}. 96adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * @throws IllegalArgumentException 97adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * if {@code precision < 0}. 98adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * @throws NullPointerException 99adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * if {@code roundingMode} is {@code null}. 100adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project */ 101adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project public MathContext(int precision, RoundingMode roundingMode) { 102adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project this.precision = precision; 103adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project this.roundingMode = roundingMode; 10488dc8b7ade1887f0926f1b6b89eea3a79353ff7dElliott Hughes checkValid(); 105adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project } 106adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project 107adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project /** 108adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * Constructs a new {@code MathContext} from a string. The string has to 109adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * specify the precision and the rounding mode to be used and has to follow 110adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * the following syntax: "precision=<precision> roundingMode=<roundingMode>" 111adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * This is the same form as the one returned by the {@link #toString} 112adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * method. 1137cf86eabacd844cae438db573d45727d7b3374bfJesse Wilson * 114adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * @throws IllegalArgumentException 115adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * if the string is not in the correct format or if the 116adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * precision specified is < 0. 117adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project */ 11888dc8b7ade1887f0926f1b6b89eea3a79353ff7dElliott Hughes public MathContext(String s) { 11988dc8b7ade1887f0926f1b6b89eea3a79353ff7dElliott Hughes int precisionLength = "precision=".length(); 12088dc8b7ade1887f0926f1b6b89eea3a79353ff7dElliott Hughes int roundingModeLength = "roundingMode=".length(); 121adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project 12288dc8b7ade1887f0926f1b6b89eea3a79353ff7dElliott Hughes int spaceIndex; 12388dc8b7ade1887f0926f1b6b89eea3a79353ff7dElliott Hughes if (!s.startsWith("precision=") || (spaceIndex = s.indexOf(' ', precisionLength)) == -1) { 12488dc8b7ade1887f0926f1b6b89eea3a79353ff7dElliott Hughes throw invalidMathContext("Missing precision", s); 125adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project } 12688dc8b7ade1887f0926f1b6b89eea3a79353ff7dElliott Hughes String precisionString = s.substring(precisionLength, spaceIndex); 12788dc8b7ade1887f0926f1b6b89eea3a79353ff7dElliott Hughes try { 12888dc8b7ade1887f0926f1b6b89eea3a79353ff7dElliott Hughes this.precision = Integer.parseInt(precisionString); 12988dc8b7ade1887f0926f1b6b89eea3a79353ff7dElliott Hughes } catch (NumberFormatException nfe) { 13088dc8b7ade1887f0926f1b6b89eea3a79353ff7dElliott Hughes throw invalidMathContext("Bad precision", s); 131adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project } 132adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project 13388dc8b7ade1887f0926f1b6b89eea3a79353ff7dElliott Hughes int roundingModeStart = spaceIndex + 1; 13488dc8b7ade1887f0926f1b6b89eea3a79353ff7dElliott Hughes if (!s.regionMatches(roundingModeStart, "roundingMode=", 0, roundingModeLength)) { 13588dc8b7ade1887f0926f1b6b89eea3a79353ff7dElliott Hughes throw invalidMathContext("Missing rounding mode", s); 136adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project } 13788dc8b7ade1887f0926f1b6b89eea3a79353ff7dElliott Hughes roundingModeStart += roundingModeLength; 13888dc8b7ade1887f0926f1b6b89eea3a79353ff7dElliott Hughes this.roundingMode = RoundingMode.valueOf(s.substring(roundingModeStart)); 139adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project 14088dc8b7ade1887f0926f1b6b89eea3a79353ff7dElliott Hughes checkValid(); 14188dc8b7ade1887f0926f1b6b89eea3a79353ff7dElliott Hughes } 142adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project 14388dc8b7ade1887f0926f1b6b89eea3a79353ff7dElliott Hughes private IllegalArgumentException invalidMathContext(String reason, String s) { 14488dc8b7ade1887f0926f1b6b89eea3a79353ff7dElliott Hughes throw new IllegalArgumentException(reason + ": " + s); 145adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project } 146adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project 14788dc8b7ade1887f0926f1b6b89eea3a79353ff7dElliott Hughes private void checkValid() { 14888dc8b7ade1887f0926f1b6b89eea3a79353ff7dElliott Hughes if (precision < 0) { 14988dc8b7ade1887f0926f1b6b89eea3a79353ff7dElliott Hughes throw new IllegalArgumentException("Negative precision: " + precision); 15088dc8b7ade1887f0926f1b6b89eea3a79353ff7dElliott Hughes } 15188dc8b7ade1887f0926f1b6b89eea3a79353ff7dElliott Hughes if (roundingMode == null) { 15288dc8b7ade1887f0926f1b6b89eea3a79353ff7dElliott Hughes throw new NullPointerException("roundingMode == null"); 15388dc8b7ade1887f0926f1b6b89eea3a79353ff7dElliott Hughes } 15488dc8b7ade1887f0926f1b6b89eea3a79353ff7dElliott Hughes } 155adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project 156adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project /** 157adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * Returns the precision. The precision is the number of digits used for an 158adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * operation. Results are rounded to this precision. The precision is 159adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * guaranteed to be non negative. If the precision is zero, then the 160adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * computations have to be performed exact, results are not rounded in this 161adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * case. 1627cf86eabacd844cae438db573d45727d7b3374bfJesse Wilson * 163adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * @return the precision. 164adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project */ 165adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project public int getPrecision() { 166adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project return precision; 167adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project } 168adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project 169adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project /** 170adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * Returns the rounding mode. The rounding mode is the strategy to be used 171adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * to round results. 1727cf86eabacd844cae438db573d45727d7b3374bfJesse Wilson * <p> 1737cf86eabacd844cae438db573d45727d7b3374bfJesse Wilson * The rounding mode is one of 174adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * {@link RoundingMode#UP}, 1757cf86eabacd844cae438db573d45727d7b3374bfJesse Wilson * {@link RoundingMode#DOWN}, 1767cf86eabacd844cae438db573d45727d7b3374bfJesse Wilson * {@link RoundingMode#CEILING}, 177adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * {@link RoundingMode#FLOOR}, 1787cf86eabacd844cae438db573d45727d7b3374bfJesse Wilson * {@link RoundingMode#HALF_UP}, 1797cf86eabacd844cae438db573d45727d7b3374bfJesse Wilson * {@link RoundingMode#HALF_DOWN}, 180adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * {@link RoundingMode#HALF_EVEN}, or 181adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * {@link RoundingMode#UNNECESSARY}. 1827cf86eabacd844cae438db573d45727d7b3374bfJesse Wilson * 183adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * @return the rounding mode. 184adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project */ 185adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project public RoundingMode getRoundingMode() { 186adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project return roundingMode; 187adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project } 188adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project 189adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project /** 190adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * Returns true if x is a {@code MathContext} with the same precision 191adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * setting and the same rounding mode as this {@code MathContext} instance. 1927cf86eabacd844cae438db573d45727d7b3374bfJesse Wilson * 193adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * @param x 194adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * object to be compared. 195adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * @return {@code true} if this {@code MathContext} instance is equal to the 196adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * {@code x} argument; {@code false} otherwise. 197adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project */ 198adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project @Override 199adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project public boolean equals(Object x) { 200adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project return ((x instanceof MathContext) 201adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project && (((MathContext) x).getPrecision() == precision) && (((MathContext) x) 202adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project .getRoundingMode() == roundingMode)); 203adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project } 204adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project 205adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project /** 206adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * Returns the hash code for this {@code MathContext} instance. 2077cf86eabacd844cae438db573d45727d7b3374bfJesse Wilson * 208adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * @return the hash code for this {@code MathContext}. 209adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project */ 210adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project @Override 211adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project public int hashCode() { 212adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project // Make place for the necessary bits to represent 8 rounding modes 213adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project return ((precision << 3) | roundingMode.ordinal()); 214adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project } 215adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project 216adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project /** 217adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * Returns the string representation for this {@code MathContext} instance. 2187cf86eabacd844cae438db573d45727d7b3374bfJesse Wilson * The string has the form 219adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * {@code 2201d58625189328f29c10fa98d52512ee6cf8cc641Ben Dodson * "precision=<precision> roundingMode=<roundingMode>" 2211d58625189328f29c10fa98d52512ee6cf8cc641Ben Dodson * } where {@code <precision>} is an integer describing the number 2221d58625189328f29c10fa98d52512ee6cf8cc641Ben Dodson * of digits used for operations and {@code <roundingMode>} is the 223adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * string representation of the rounding mode. 2247cf86eabacd844cae438db573d45727d7b3374bfJesse Wilson * 225adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * @return a string representation for this {@code MathContext} instance 226adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project */ 227adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project @Override 228adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project public String toString() { 2297f0c06f737b6f1f6b3a5bb30111f95dd0ca586a2Brian Carlstrom return "precision=" + precision + " roundingMode=" + roundingMode; 230adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project } 231adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project 232adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project /** 233adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * Makes checks upon deserialization of a {@code MathContext} instance. 234adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * Checks whether {@code precision >= 0} and {@code roundingMode != null} 2357cf86eabacd844cae438db573d45727d7b3374bfJesse Wilson * 236adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * @throws StreamCorruptedException 237adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * if {@code precision < 0} 238adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * @throws StreamCorruptedException 239adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * if {@code roundingMode == null} 240adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project */ 2418454d3c5b9778ae359d11cd98ed81c589e951d0aElliott Hughes private void readObject(ObjectInputStream s) throws IOException, ClassNotFoundException { 242adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project s.defaultReadObject(); 24388dc8b7ade1887f0926f1b6b89eea3a79353ff7dElliott Hughes try { 24488dc8b7ade1887f0926f1b6b89eea3a79353ff7dElliott Hughes checkValid(); 24588dc8b7ade1887f0926f1b6b89eea3a79353ff7dElliott Hughes } catch (Exception ex) { 24688dc8b7ade1887f0926f1b6b89eea3a79353ff7dElliott Hughes throw new StreamCorruptedException(ex.getMessage()); 247adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project } 248adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project } 249adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project} 250