/**
    * Logback: the reliable, generic, fast and flexible logging framework.
    * Copyright (C) 1999-2011, 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.access.pattern;
  
  import java.util.List;
  import java.util.TimeZone;
  
  import ch.qos.logback.access.spi.IAccessEvent;
  import ch.qos.logback.core.CoreConstants;
  import ch.qos.logback.core.util.CachingDateFormatter;
  
  
  public class DateConverter extends AccessConverter {
  
  
    CachingDateFormatter cachingDateFormatter = null;
    
    public void start() {
      
      String datePattern = getFirstOption();
      if(datePattern == null) {
        datePattern = CoreConstants.CLF_DATE_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.CLF_DATE_PATTERN);
      }
      
      List 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(IAccessEvent accessEvent) {
      long timestamp = accessEvent.getTimeStamp();
      return cachingDateFormatter.format(timestamp);
    }
  }