--- /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.pattern;
+
+import org.apache.log4j.helpers.LogLog;
+import org.apache.log4j.spi.LoggingEvent;
+
+import java.text.SimpleDateFormat;
+import java.text.DateFormat;
+import java.text.FieldPosition;
+import java.text.ParsePosition;
+import java.util.Date;
+import java.util.TimeZone;
+
+
+/**
+ * Convert and format the event's date in a StringBuffer.
+ *
+ * @author Ceki Gülcü
+ */
+public final class DatePatternConverter extends LoggingEventPatternConverter {
+ /**
+ * ABSOLUTE string literal.
+ */
+ private static final String ABSOLUTE_FORMAT = "ABSOLUTE";
+ /**
+ * SimpleTimePattern for ABSOLUTE.
+ */
+ private static final String ABSOLUTE_TIME_PATTERN = "HH:mm:ss,SSS";
+
+
+ /**
+ * DATE string literal.
+ */
+ private static final String DATE_AND_TIME_FORMAT = "DATE";
+ /**
+ * SimpleTimePattern for DATE.
+ */
+ private static final String DATE_AND_TIME_PATTERN = "dd MMM yyyy HH:mm:ss,SSS";
+
+ /**
+ * ISO8601 string literal.
+ */
+ private static final String ISO8601_FORMAT = "ISO8601";
+ /**
+ * SimpleTimePattern for ISO8601.
+ */
+ private static final String ISO8601_PATTERN = "yyyy-MM-dd HH:mm:ss,SSS";
+ /**
+ * Date format.
+ */
+ private final CachedDateFormat df;
+
+ /**
+ * This class wraps a DateFormat and forces the time zone to the
+ * default time zone before each format and parse request.
+ */
+ private static class DefaultZoneDateFormat extends DateFormat {
+ /**
+ * Serialization version ID.
+ */
+ private static final long serialVersionUID = 1;
+ /**
+ * Wrapped instance of DateFormat.
+ */
+ private final DateFormat dateFormat;
+
+ /**
+ * Construct new instance.
+ * @param format format, may not be null.
+ */
+ public DefaultZoneDateFormat(final DateFormat format) {
+ dateFormat = format;
+ }
+
+ /**
+ * @{inheritDoc}
+ */
+ public StringBuffer format(Date date, StringBuffer toAppendTo, FieldPosition fieldPosition) {
+ dateFormat.setTimeZone(TimeZone.getDefault());
+ return dateFormat.format(date, toAppendTo, fieldPosition);
+ }
+
+ /**
+ * @{inheritDoc}
+ */
+ public Date parse(String source, ParsePosition pos) {
+ dateFormat.setTimeZone(TimeZone.getDefault());
+ return dateFormat.parse(source, pos);
+ }
+ }
+
+ /**
+ * Private constructor.
+ * @param options options, may be null.
+ */
+ private DatePatternConverter(final String[] options) {
+ super("Date", "date");
+
+ String patternOption;
+
+ if ((options == null) || (options.length == 0)) {
+ // the branch could be optimized, but here we are making explicit
+ // that null values for patternOption are allowed.
+ patternOption = null;
+ } else {
+ patternOption = options[0];
+ }
+
+ String pattern;
+
+ if (
+ (patternOption == null)
+ || patternOption.equalsIgnoreCase(ISO8601_FORMAT)) {
+ pattern = ISO8601_PATTERN;
+ } else if (patternOption.equalsIgnoreCase(ABSOLUTE_FORMAT)) {
+ pattern = ABSOLUTE_TIME_PATTERN;
+ } else if (patternOption.equalsIgnoreCase(DATE_AND_TIME_FORMAT)) {
+ pattern = DATE_AND_TIME_PATTERN;
+ } else {
+ pattern = patternOption;
+ }
+
+ int maximumCacheValidity = 1000;
+ DateFormat simpleFormat = null;
+
+ try {
+ simpleFormat = new SimpleDateFormat(pattern);
+ maximumCacheValidity = CachedDateFormat.getMaximumCacheValidity(pattern);
+ } catch (IllegalArgumentException e) {
+ LogLog.warn(
+ "Could not instantiate SimpleDateFormat with pattern "
+ + patternOption, e);
+
+ // default to the ISO8601 format
+ simpleFormat = new SimpleDateFormat(ISO8601_PATTERN);
+ }
+
+ // if the option list contains a TZ option, then set it.
+ if ((options != null) && (options.length > 1)) {
+ TimeZone tz = TimeZone.getTimeZone(options[1]);
+ simpleFormat.setTimeZone(tz);
+ } else {
+ simpleFormat = new DefaultZoneDateFormat(simpleFormat);
+ }
+
+ df = new CachedDateFormat(simpleFormat, maximumCacheValidity);
+ }
+
+ /**
+ * Obtains an instance of pattern converter.
+ * @param options options, may be null.
+ * @return instance of pattern converter.
+ */
+ public static DatePatternConverter newInstance(
+ final String[] options) {
+ return new DatePatternConverter(options);
+ }
+
+ /**
+ * {@inheritDoc}
+ */
+ public void format(final LoggingEvent event, final StringBuffer output) {
+ synchronized(this) {
+ df.format(event.timeStamp, output);
+ }
+ }
+
+ /**
+ * {@inheritDoc}
+ */
+ public void format(final Object obj, final StringBuffer output) {
+ if (obj instanceof Date) {
+ format((Date) obj, output);
+ }
+
+ super.format(obj, output);
+ }
+
+ /**
+ * Append formatted date to string buffer.
+ * @param date date
+ * @param toAppendTo buffer to which formatted date is appended.
+ */
+ public void format(final Date date, final StringBuffer toAppendTo) {
+ synchronized(this) {
+ df.format(date.getTime(), toAppendTo);
+ }
+ }
+}
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