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 THREAD_SAFE_DATE_FORMAT = new ThreadSafeDateFormat(DATE_FORMAT); 038 private static final ThreadSafeDateFormat THREAD_SAFE_DATETIME_FORMAT = new ThreadSafeDateFormat(DATETIME_FORMAT); 039 040 private DateUtils() { 041 } 042 043 public static String formatDate(Date d) { 044 return THREAD_SAFE_DATE_FORMAT.format(d); 045 } 046 047 public static String formatDateTime(Date d) { 048 return THREAD_SAFE_DATETIME_FORMAT.format(d); 049 } 050 051 public static Date parseDate(String s) { 052 try { 053 return THREAD_SAFE_DATE_FORMAT.parse(s); 054 055 } catch (ParseException e) { 056 throw new SonarException("The date '" + s + "' does not respect format '" + DATE_FORMAT + "'", e); 057 } 058 } 059 060 public static Date parseDateTime(String s) { 061 try { 062 return THREAD_SAFE_DATETIME_FORMAT.parse(s); 063 064 } catch (ParseException e) { 065 throw new SonarException("The date '" + s + "' does not respect format '" + DATETIME_FORMAT + "'", e); 066 } 067 } 068 069 static class ThreadSafeDateFormat extends DateFormat { 070 private static final long serialVersionUID = -8856468429474634301L; 071 private final String format; 072 073 ThreadSafeDateFormat(String format) { 074 this.format = format; 075 } 076 077 private final transient ThreadLocal cache = new ThreadLocal() { 078 public Object get() { 079 Reference softRef = (Reference) super.get(); 080 if (softRef == null || softRef.get() == null) { 081 softRef = new SoftReference(new SimpleDateFormat(format)); 082 super.set(softRef); 083 } 084 return softRef; 085 } 086 }; 087 088 private DateFormat getDateFormat() { 089 return (DateFormat) ((Reference) cache.get()).get(); 090 } 091 092 public StringBuffer format(Date date, StringBuffer toAppendTo, FieldPosition fieldPosition) { 093 return getDateFormat().format(date, toAppendTo, fieldPosition); 094 } 095 096 public Date parse(String source, ParsePosition pos) { 097 return getDateFormat().parse(source, pos); 098 } 099 } 100 }