--- /dev/null
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.log4j.helpers;
+
+import java.util.Date;
+import java.util.Calendar;
+import java.util.TimeZone;
+import java.text.FieldPosition;
+import java.text.ParsePosition;
+import java.text.DateFormat;
+
+
+/**
+ Formats a {@link Date} in the format "HH:mm:ss,SSS" for example,
+ "15:49:37,459".
+
+ @author Ceki Gülcü
+ @author Andrew Vajoczki
+
+ @since 0.7.5
+*/
+public class AbsoluteTimeDateFormat extends DateFormat {
+ private static final long serialVersionUID = -388856345976723342L;
+
+ /**
+ String constant used to specify {@link
+ org.apache.log4j.helpers.AbsoluteTimeDateFormat} in layouts. Current
+ value is <b>ABSOLUTE</b>. */
+ public final static String ABS_TIME_DATE_FORMAT = "ABSOLUTE";
+
+ /**
+ String constant used to specify {@link
+ org.apache.log4j.helpers.DateTimeDateFormat} in layouts. Current
+ value is <b>DATE</b>.
+ */
+ public final static String DATE_AND_TIME_DATE_FORMAT = "DATE";
+
+ /**
+ String constant used to specify {@link
+ org.apache.log4j.helpers.ISO8601DateFormat} in layouts. Current
+ value is <b>ISO8601</b>.
+ */
+ public final static String ISO8601_DATE_FORMAT = "ISO8601";
+
+ public
+ AbsoluteTimeDateFormat() {
+ setCalendar(Calendar.getInstance());
+ }
+
+ public
+ AbsoluteTimeDateFormat(TimeZone timeZone) {
+ setCalendar(Calendar.getInstance(timeZone));
+ }
+
+ private static long previousTime;
+ private static char[] previousTimeWithoutMillis = new char[9]; // "HH:mm:ss."
+
+ /**
+ Appends to <code>sbuf</code> the time in the format
+ "HH:mm:ss,SSS" for example, "15:49:37,459"
+
+ @param date the date to format
+ @param sbuf the string buffer to write to
+ @param fieldPosition remains untouched
+ */
+ public
+ StringBuffer format(Date date, StringBuffer sbuf,
+ FieldPosition fieldPosition) {
+
+ long now = date.getTime();
+ int millis = (int)(now % 1000);
+
+ if ((now - millis) != previousTime || previousTimeWithoutMillis[0] == 0) {
+ // We reach this point at most once per second
+ // across all threads instead of each time format()
+ // is called. This saves considerable CPU time.
+
+ calendar.setTime(date);
+
+ int start = sbuf.length();
+
+ int hour = calendar.get(Calendar.HOUR_OF_DAY);
+ if(hour < 10) {
+ sbuf.append('0');
+ }
+ sbuf.append(hour);
+ sbuf.append(':');
+
+ int mins = calendar.get(Calendar.MINUTE);
+ if(mins < 10) {
+ sbuf.append('0');
+ }
+ sbuf.append(mins);
+ sbuf.append(':');
+
+ int secs = calendar.get(Calendar.SECOND);
+ if(secs < 10) {
+ sbuf.append('0');
+ }
+ sbuf.append(secs);
+ sbuf.append(',');
+
+ // store the time string for next time to avoid recomputation
+ sbuf.getChars(start, sbuf.length(), previousTimeWithoutMillis, 0);
+
+ previousTime = now - millis;
+ }
+ else {
+ sbuf.append(previousTimeWithoutMillis);
+ }
+
+
+
+ if(millis < 100) {
+ sbuf.append('0');
+ }
+ if(millis < 10) {
+ sbuf.append('0');
+ }
+
+ sbuf.append(millis);
+ return sbuf;
+ }
+
+ /**
+ This method does not do anything but return <code>null</code>.
+ */
+ public
+ Date parse(String s, ParsePosition pos) {
+ return null;
+ }
+}