001    /*
002     * Sonar, open source software quality management tool.
003     * Copyright (C) 2009 SonarSource SA
004     * mailto:contact AT sonarsource DOT com
005     *
006     * Sonar is free software; you can redistribute it and/or
007     * modify it under the terms of the GNU Lesser General Public
008     * License as published by the Free Software Foundation; either
009     * version 3 of the License, or (at your option) any later version.
010     *
011     * Sonar is distributed in the hope that it will be useful,
012     * but WITHOUT ANY WARRANTY; without even the implied warranty of
013     * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
014     * Lesser General Public License for more details.
015     *
016     * You should have received a copy of the GNU Lesser General Public
017     * License along with Sonar; if not, write to the Free Software
018     * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02
019     */
020    package org.sonar.api.utils;
021    
022    import java.math.BigDecimal;
023    import java.math.RoundingMode;
024    import java.text.NumberFormat;
025    import java.text.ParseException;
026    import java.util.Locale;
027    
028    /**
029     * @since 1.10
030     */
031    public final class ParsingUtils {
032    
033      private ParsingUtils() {
034      }
035    
036      public static double parseNumber(String number, Locale locale) throws ParseException {
037        if ("".equals(number)) {
038          return Double.NaN;
039        }
040        return NumberFormat.getNumberInstance(locale).parse(number).doubleValue();
041      }
042    
043      public static double parseNumber(String number) throws ParseException {
044        return parseNumber(number, Locale.getDefault());
045      }
046    
047      public static double scaleValue(double value) {
048        return scaleValue(value, 2);
049      }
050    
051      public static double scaleValue(double value, int decimals) {
052        BigDecimal bd = BigDecimal.valueOf(value);
053        return bd.setScale(decimals, RoundingMode.HALF_UP).doubleValue();
054      }
055    
056    }