001 /* 002 * Sonar, open source software quality management tool. 003 * Copyright (C) 2008-2011 SonarSource 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.lang.ref.Reference; 023 import java.lang.ref.SoftReference; 024 import java.text.*; 025 import java.util.Date; 026 027 /** 028 * Parses and formats ISO 8601 dates. See http://en.wikipedia.org/wiki/ISO_8601. 029 * This class is thread-safe. 030 * 031 * @since 2.7 032 */ 033 public final class DateUtils { 034 public static final String DATE_FORMAT = "yyyy-MM-dd"; 035 public static final String DATETIME_FORMAT = "yyyy-MM-dd'T'HH:mm:ssZ"; 036 037 private static final ThreadSafeDateFormat dateFormat = new ThreadSafeDateFormat(DATE_FORMAT); 038 private static final ThreadSafeDateFormat dateTimeFormat = new ThreadSafeDateFormat(DATETIME_FORMAT); 039 040 public static String formatDate(Date d) { 041 return dateFormat.format(d); 042 } 043 044 public static String formatDateTime(Date d) { 045 return dateTimeFormat.format(d); 046 } 047 048 public static Date parseDate(String s) { 049 try { 050 return dateFormat.parse(s); 051 052 } catch (ParseException e) { 053 throw new SonarException("The date '" + s + "' does not respect format '" + DATE_FORMAT + "'", e); 054 } 055 } 056 057 public static Date parseDateTime(String s) { 058 try { 059 return dateTimeFormat.parse(s); 060 061 } catch (ParseException e) { 062 throw new SonarException("The date '" + s + "' does not respect format '" + DATETIME_FORMAT + "'", e); 063 } 064 } 065 066 static class ThreadSafeDateFormat extends DateFormat { 067 private final String format; 068 069 ThreadSafeDateFormat(String format) { 070 this.format = format; 071 } 072 073 private final transient ThreadLocal cache = new ThreadLocal() { 074 public Object get() { 075 Reference softRef = (Reference)super.get(); 076 if (softRef == null || softRef.get() == null) { 077 softRef = new SoftReference(new SimpleDateFormat(format)); 078 super.set(softRef); 079 } 080 return softRef; 081 } 082 }; 083 084 private DateFormat getDateFormat() { 085 return (DateFormat) ((Reference)cache.get()).get(); 086 } 087 088 public StringBuffer format(Date date,StringBuffer toAppendTo, FieldPosition fieldPosition) { 089 return getDateFormat().format(date, toAppendTo, fieldPosition); 090 } 091 092 public Date parse(String source, ParsePosition pos) { 093 return getDateFormat().parse(source, pos); 094 } 095 } 096 }