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.Date; 021import java.util.Calendar; 022import java.util.TimeZone; 023import java.text.FieldPosition; 024import java.text.ParsePosition; 025import java.text.DateFormat; 026 027 028/** 029 Formats a {@link Date} in the format "HH:mm:ss,SSS" for example, 030 "15:49:37,459". 031 032 @author Ceki Gülcü 033 @author Andrew Vajoczki 034 035 @since 0.7.5 036*/ 037public class AbsoluteTimeDateFormat extends DateFormat { 038 private static final long serialVersionUID = -388856345976723342L; 039 040 /** 041 String constant used to specify {@link 042 org.apache.log4j.helpers.AbsoluteTimeDateFormat} in layouts. Current 043 value is <b>ABSOLUTE</b>. */ 044 public final static String ABS_TIME_DATE_FORMAT = "ABSOLUTE"; 045 046 /** 047 String constant used to specify {@link 048 org.apache.log4j.helpers.DateTimeDateFormat} in layouts. Current 049 value is <b>DATE</b>. 050 */ 051 public final static String DATE_AND_TIME_DATE_FORMAT = "DATE"; 052 053 /** 054 String constant used to specify {@link 055 org.apache.log4j.helpers.ISO8601DateFormat} in layouts. Current 056 value is <b>ISO8601</b>. 057 */ 058 public final static String ISO8601_DATE_FORMAT = "ISO8601"; 059 060 public 061 AbsoluteTimeDateFormat() { 062 setCalendar(Calendar.getInstance()); 063 } 064 065 public 066 AbsoluteTimeDateFormat(TimeZone timeZone) { 067 setCalendar(Calendar.getInstance(timeZone)); 068 } 069 070 private static long previousTime; 071 private static char[] previousTimeWithoutMillis = new char[9]; // "HH:mm:ss." 072 073 /** 074 Appends to <code>sbuf</code> the time in the format 075 "HH:mm:ss,SSS" for example, "15:49:37,459" 076 077 @param date the date to format 078 @param sbuf the string buffer to write to 079 @param fieldPosition remains untouched 080 */ 081 public 082 StringBuffer format(Date date, StringBuffer sbuf, 083 FieldPosition fieldPosition) { 084 085 long now = date.getTime(); 086 int millis = (int)(now % 1000); 087 088 if ((now - millis) != previousTime || previousTimeWithoutMillis[0] == 0) { 089 // We reach this point at most once per second 090 // across all threads instead of each time format() 091 // is called. This saves considerable CPU time. 092 093 calendar.setTime(date); 094 095 int start = sbuf.length(); 096 097 int hour = calendar.get(Calendar.HOUR_OF_DAY); 098 if(hour < 10) { 099 sbuf.append('0'); 100 } 101 sbuf.append(hour); 102 sbuf.append(':'); 103 104 int mins = calendar.get(Calendar.MINUTE); 105 if(mins < 10) { 106 sbuf.append('0'); 107 } 108 sbuf.append(mins); 109 sbuf.append(':'); 110 111 int secs = calendar.get(Calendar.SECOND); 112 if(secs < 10) { 113 sbuf.append('0'); 114 } 115 sbuf.append(secs); 116 sbuf.append(','); 117 118 // store the time string for next time to avoid recomputation 119 sbuf.getChars(start, sbuf.length(), previousTimeWithoutMillis, 0); 120 121 previousTime = now - millis; 122 } 123 else { 124 sbuf.append(previousTimeWithoutMillis); 125 } 126 127 128 129 if(millis < 100) 130 sbuf.append('0'); 131 if(millis < 10) 132 sbuf.append('0'); 133 134 sbuf.append(millis); 135 return sbuf; 136 } 137 138 /** 139 This method does not do anything but return <code>null</code>. 140 */ 141 public 142 Date parse(String s, ParsePosition pos) { 143 return null; 144 } 145}