Logback: the reliable, generic, fast and flexible logging framework.
Copyright (C) 1999-2015, QOS.ch. All rights reserved.
This program and the accompanying materials are dual-licensed under
either the terms of the Eclipse Public License v1.0 as published by
the Eclipse Foundation
  or (per the licensee's choosing)
under the terms of the GNU Lesser General Public License version 2.1
as published by the Free Software Foundation.
/**
 * Logback: the reliable, generic, fast and flexible logging framework.
 * Copyright (C) 1999-2015, QOS.ch. All rights reserved.
 *
 * This program and the accompanying materials are dual-licensed under
 * either the terms of the Eclipse Public License v1.0 as published by
 * the Eclipse Foundation
 *
 *   or (per the licensee's choosing)
 *
 * under the terms of the GNU Lesser General Public License version 2.1
 * as published by the Free Software Foundation.
 */
package ch.qos.logback.classic.pattern;

import java.util.List;
import java.util.TimeZone;

import ch.qos.logback.classic.spi.ILoggingEvent;
import ch.qos.logback.core.CoreConstants;
import ch.qos.logback.core.util.CachingDateFormatter;

public class DateConverter extends ClassicConverter {

    long lastTimestamp = -1;
    String timestampStrCache = null;
    CachingDateFormatter cachingDateFormatter = null;

    public void start() {

        String datePattern = getFirstOption();
        if (datePattern == null) {
            datePattern = CoreConstants.ISO8601_PATTERN;
        }

        if (datePattern.equals(CoreConstants.ISO8601_STR)) {
            datePattern = CoreConstants.ISO8601_PATTERN;
        }

        try {
            cachingDateFormatter = new CachingDateFormatter(datePattern);
            // maximumCacheValidity =
            // CachedDateFormat.getMaximumCacheValidity(pattern);
        } catch (IllegalArgumentException e) {
            addWarn("Could not instantiate SimpleDateFormat with pattern " + datePattern, e);
            // default to the ISO8601 format
            cachingDateFormatter = new CachingDateFormatter(CoreConstants.ISO8601_PATTERN);
        }

        List<String> optionList = getOptionList();

        // if the option list contains a TZ option, then set it.
        if (optionList != null && optionList.size() > 1) {
            TimeZone tz = TimeZone.getTimeZone((String) optionList.get(1));
            cachingDateFormatter.setTimeZone(tz);
        }
    }

    public String convert(ILoggingEvent le) {
        long timestamp = le.getTimeStamp();
        return cachingDateFormatter.format(timestamp);
    }
}