/*
 * Copyright (C) The Apache Software Foundation. All rights reserved.
 *
 * This software is published under the terms of the Apache Software
 * License version 1.1, a copy of which has been included with this
 * distribution in the LICENSE.txt file.  */

package org.apache.log4j.helpers;

import java.util.Calendar;
import java.util.TimeZone;
import java.util.Date;
import java.text.FieldPosition;
import java.text.ParsePosition;
import java.text.DateFormatSymbols;

/**
   Formats a {@link Date} in the format "dd MMM YYYY HH:mm:ss,SSS" for example,
   "06 Nov 1994 15:49:37,459".

   @author Ceki Gülcü
   @since 0.7.5
*/
public class DateTimeDateFormat extends AbsoluteTimeDateFormat {

  String[] shortMonths;

  public
  DateTimeDateFormat() {
    super();
    shortMonths = new DateFormatSymbols().getShortMonths();
  }

  public
  DateTimeDateFormat(TimeZone timeZone) {
    this();
    setCalendar(Calendar.getInstance(timeZone));
  }

  /**
     Appends to sbuf the date in the format "dd MMM YYYY
     HH:mm:ss,SSS" for example, "06 Nov 1994 08:49:37,459".

     @param sbuf the string buffer to write to
  */
  public
  StringBuffer format(Date date, StringBuffer sbuf,
		      FieldPosition fieldPosition) {

    calendar.setTime(date);

    int day = calendar.get(Calendar.DAY_OF_MONTH);
    if(day < 10)
      sbuf.append('0');
    sbuf.append(day);
    sbuf.append(' ');
    sbuf.append(shortMonths[calendar.get(Calendar.MONTH)]);
    sbuf.append(' ');

    int year =  calendar.get(Calendar.YEAR);
    sbuf.append(year);
    sbuf.append(' ');

    return super.format(date, sbuf, fieldPosition);
  }

  /**
     This method does not do anything but return null.
   */
  public
  Date parse(java.lang.String s, ParsePosition pos) {
    return null;
  }
}