/**
    * 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.core.rolling.helper;
  
  import java.util.Date;
  
  import ch.qos.logback.core.CoreConstants;
  import ch.qos.logback.core.pattern.DynamicConverter;
  import ch.qos.logback.core.util.CachingDateFormatter;
  
  /**
   * Returns a date formatted by SimpleDateFormatter.
   * 
   * @author Ceki Gücü
   */
  public class DateTokenConverter<E> extends DynamicConverter<E> implements MonoTypedConverter {
  
    /**
     * The conversion word/character with which this converter is registered.
     */
    public final static String CONVERTER_KEY = "d";
    public static final String DEFAULT_DATE_PATTERN = CoreConstants.DAILY_DATE_PATTERN;
  
    private String datePattern;
    private CachingDateFormatter cdf;
  
    public DateTokenConverter() {
    }
  
    public void start() {
      this.datePattern = getFirstOption();
      if (this.datePattern == null) {
        this.datePattern = DEFAULT_DATE_PATTERN;
      }
      cdf = new CachingDateFormatter(datePattern);
    }
  
    public String convert(Date date) {
      return cdf.format(date.getTime());
    }
  
    public String convert(Object o) {
      if (o == null) {
        throw new IllegalArgumentException("Null argument forbidden");
      }
      if (o instanceof Date) {
        return convert((Date) o);
      } 
      throw new IllegalArgumentException("Cannot convert "+o+" of type"+o.getClass().getName());
    }
  
    /**
     * Return the date pattern.
     */
    public String getDatePattern() {
      return datePattern;
    }
  
    public boolean isApplicable(Object o) {
      return (o instanceof Date);
    }
  
    public String toRegex() {
      DatePatternToRegexUtil toRegex = new DatePatternToRegexUtil(datePattern);
      return toRegex.toRegex();
    }
  }