1 /*******************************************************************************
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2 * Copyright (c) 2007, 2010 Association for Decentralized Information Management
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3 * in Industry THTH ry.
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4 * All rights reserved. This program and the accompanying materials
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5 * are made available under the terms of the Eclipse Public License v1.0
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6 * which accompanies this distribution, and is available at
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7 * http://www.eclipse.org/legal/epl-v10.html
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10 * VTT Technical Research Centre of Finland - initial API and implementation
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11 *******************************************************************************/
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12 package org.simantics.utils.format;
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14 import java.math.BigDecimal;
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15 import java.math.MathContext;
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16 import java.text.DecimalFormat;
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17 import java.text.DecimalFormatSymbols;
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18 import java.text.FieldPosition;
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19 import java.text.Format;
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20 import java.text.NumberFormat;
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21 import java.text.ParsePosition;
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22 import java.util.Locale;
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25 * @author Antti Villberg
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27 public class FormattingUtils {
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29 public static final FormattingUtil US = new FormattingUtil(5, 5, Locale.US);
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30 public static final FormattingUtil DEFAULT = US;
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32 public static String engineeringFormat(Object value) {
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33 return DEFAULT.engineeringFormat(value);
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36 public static Format significantDigitFormat(int withSignificantDigits) {
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37 return significantDigitFormat(withSignificantDigits, false);
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40 public static Format significantDigitFormat(int withSignificantDigits, boolean stripTrailingZeros) {
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41 if (withSignificantDigits < 1)
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42 throw new IllegalArgumentException("withSignificantDigits must be > 0, got " + withSignificantDigits);
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43 StringBuilder sb = new StringBuilder(withSignificantDigits + 3);
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45 for (int i = 0; i < withSignificantDigits-1; i++)
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48 NumberFormat low = new DecimalFormat(sb.toString());
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49 low.setGroupingUsed(false);
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50 NumberFormat hi = new SignificantDigitFormat(withSignificantDigits, stripTrailingZeros);
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51 Format format = new SwitchFormat(0.1, 1, low, hi, hi);
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55 private static class SignificantDigitFormat extends NumberFormat {
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57 private static final long serialVersionUID = 1079268918077141671L;
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59 private MathContext mc;
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60 private boolean stripTrailingZeros;
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61 private boolean fixDecimalSeparator;
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62 private char decimalSeparator;
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64 public SignificantDigitFormat(int digits, boolean stripTrailingZeros) {
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65 this.mc = new MathContext(digits);
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66 this.stripTrailingZeros = stripTrailingZeros;
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67 DecimalFormatSymbols symbols = DecimalFormatSymbols.getInstance();
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68 decimalSeparator = symbols.getDecimalSeparator();
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69 // BigDecimal always formats doubles with '.' as decimal separator.
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70 if (decimalSeparator != '.')
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71 fixDecimalSeparator = true;
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73 fixDecimalSeparator = false;
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77 public StringBuffer format(double number, StringBuffer toAppendTo, FieldPosition pos) {
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78 BigDecimal big = new BigDecimal(number, mc);
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79 if (stripTrailingZeros)
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80 big = big.stripTrailingZeros();
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81 String str = big.toString();
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82 if (fixDecimalSeparator)
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83 str = str.replace('.', decimalSeparator);
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84 return toAppendTo.append(str);
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88 public StringBuffer format(long number, StringBuffer toAppendTo, FieldPosition pos) {
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89 return toAppendTo.append(number);
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93 public Number parse(String source, ParsePosition parsePosition) {
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