001/* 002 * SonarQube 003 * Copyright (C) 2009-2016 SonarSource SA 004 * mailto:contact AT sonarsource DOT com 005 * 006 * This program 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 * This program 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 License 017 * along with this program; if not, write to the Free Software Foundation, 018 * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. 019 */ 020package org.sonar.api.utils; 021 022import java.math.BigDecimal; 023import java.math.RoundingMode; 024import java.text.NumberFormat; 025import java.text.ParseException; 026import java.util.Locale; 027 028/** 029 * Utility to parse various inputs 030 * 031 * @since 1.10 032 */ 033public final class ParsingUtils { 034 035 private ParsingUtils() { 036 } 037 038 /** 039 * Parses a string with a locale and returns the corresponding number 040 * 041 * @throws ParseException if number cannot be parsed 042 */ 043 public static double parseNumber(String number, Locale locale) throws ParseException { 044 if ("".equals(number)) { 045 return Double.NaN; 046 } 047 return NumberFormat.getNumberInstance(locale).parse(number).doubleValue(); 048 } 049 050 /** 051 * Parses a string with the default locale and returns the corresponding number 052 * 053 * @throws ParseException if number cannot be parsed 054 */ 055 public static double parseNumber(String number) throws ParseException { 056 return parseNumber(number, Locale.getDefault()); 057 } 058 059 /** 060 * Scales a double value, taking into account 2 decimals 061 */ 062 public static double scaleValue(double value) { 063 return scaleValue(value, 2); 064 } 065 066 /** 067 * Scales a double value with decimals 068 */ 069 public static double scaleValue(double value, int decimals) { 070 BigDecimal bd = BigDecimal.valueOf(value); 071 return bd.setScale(decimals, RoundingMode.HALF_UP).doubleValue(); 072 } 073 074}