001/* 002 * Licensed to the Apache Software Foundation (ASF) under one or more 003 * contributor license agreements. See the NOTICE file distributed with 004 * this work for additional information regarding copyright ownership. 005 * The ASF licenses this file to You under the Apache License, Version 2.0 006 * (the "License"); you may not use this file except in compliance with 007 * the License. You may obtain a copy of the License at 008 * 009 * http://www.apache.org/licenses/LICENSE-2.0 010 * 011 * Unless required by applicable law or agreed to in writing, software 012 * distributed under the License is distributed on an "AS IS" BASIS, 013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 014 * See the License for the specific language governing permissions and 015 * limitations under the License. 016 */ 017 018package org.apache.log4j.helpers; 019 020import java.util.Calendar; 021import java.util.TimeZone; 022import java.util.Date; 023import java.text.FieldPosition; 024import java.text.ParsePosition; 025 026// Contributors: Arndt Schoenewald <arndt@ibm23093i821.mc.schoenewald.de> 027 028/** 029 Formats a {@link Date} in the format "yyyy-MM-dd HH:mm:ss,SSS" for example 030 "1999-11-27 15:49:37,459". 031 032 <p>Refer to the <a 033 href=http://www.cl.cam.ac.uk/~mgk25/iso-time.html>summary of the 034 International Standard Date and Time Notation</a> for more 035 information on this format. 036 037 @author Ceki Gülcü 038 @author Andrew Vajoczki 039 040 @since 0.7.5 041*/ 042public class ISO8601DateFormat extends AbsoluteTimeDateFormat { 043 private static final long serialVersionUID = -759840745298755296L; 044 045 public 046 ISO8601DateFormat() { 047 } 048 049 public 050 ISO8601DateFormat(TimeZone timeZone) { 051 super(timeZone); 052 } 053 054 static private long lastTime; 055 static private char[] lastTimeString = new char[20]; 056 057 /** 058 Appends a date in the format "YYYY-mm-dd HH:mm:ss,SSS" 059 to <code>sbuf</code>. For example: "1999-11-27 15:49:37,459". 060 061 @param sbuf the <code>StringBuffer</code> to write to 062 */ 063 public 064 StringBuffer format(Date date, StringBuffer sbuf, 065 FieldPosition fieldPosition) { 066 067 long now = date.getTime(); 068 int millis = (int)(now % 1000); 069 070 if ((now - millis) != lastTime || lastTimeString[0] == 0) { 071 // We reach this point at most once per second 072 // across all threads instead of each time format() 073 // is called. This saves considerable CPU time. 074 075 calendar.setTime(date); 076 077 int start = sbuf.length(); 078 079 int year = calendar.get(Calendar.YEAR); 080 sbuf.append(year); 081 082 String month; 083 switch(calendar.get(Calendar.MONTH)) { 084 case Calendar.JANUARY: month = "-01-"; break; 085 case Calendar.FEBRUARY: month = "-02-"; break; 086 case Calendar.MARCH: month = "-03-"; break; 087 case Calendar.APRIL: month = "-04-"; break; 088 case Calendar.MAY: month = "-05-"; break; 089 case Calendar.JUNE: month = "-06-"; break; 090 case Calendar.JULY: month = "-07-"; break; 091 case Calendar.AUGUST: month = "-08-"; break; 092 case Calendar.SEPTEMBER: month = "-09-"; break; 093 case Calendar.OCTOBER: month = "-10-"; break; 094 case Calendar.NOVEMBER: month = "-11-"; break; 095 case Calendar.DECEMBER: month = "-12-"; break; 096 default: month = "-NA-"; break; 097 } 098 sbuf.append(month); 099 100 int day = calendar.get(Calendar.DAY_OF_MONTH); 101 if(day < 10) 102 sbuf.append('0'); 103 sbuf.append(day); 104 105 sbuf.append(' '); 106 107 int hour = calendar.get(Calendar.HOUR_OF_DAY); 108 if(hour < 10) { 109 sbuf.append('0'); 110 } 111 sbuf.append(hour); 112 sbuf.append(':'); 113 114 int mins = calendar.get(Calendar.MINUTE); 115 if(mins < 10) { 116 sbuf.append('0'); 117 } 118 sbuf.append(mins); 119 sbuf.append(':'); 120 121 int secs = calendar.get(Calendar.SECOND); 122 if(secs < 10) { 123 sbuf.append('0'); 124 } 125 sbuf.append(secs); 126 127 sbuf.append(','); 128 129 // store the time string for next time to avoid recomputation 130 sbuf.getChars(start, sbuf.length(), lastTimeString, 0); 131 lastTime = now - millis; 132 } 133 else { 134 sbuf.append(lastTimeString); 135 } 136 137 138 if (millis < 100) 139 sbuf.append('0'); 140 if (millis < 10) 141 sbuf.append('0'); 142 143 sbuf.append(millis); 144 return sbuf; 145 } 146 147 /** 148 This method does not do anything but return <code>null</code>. 149 */ 150 public 151 Date parse(java.lang.String s, ParsePosition pos) { 152 return null; 153 } 154} 155