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package org.unidal.formatter;

import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.HashMap;
import java.util.Locale;
import java.util.Map;

import org.unidal.lookup.annotation.Named;

@Named(type = Formatter.class, value = "java.util.Date")
public class DateFormatter implements Formatter {
   private static final InheritableThreadLocal MANAGER = new InheritableThreadLocal() {
      @Override
      protected Manager initialValue() {
         return new Manager();
      }
   };

   public Date parse(String format, String text) throws FormatterException {
      SimpleDateFormat dateFormat = MANAGER.get().getDateFormat(format);

      try {
         return dateFormat.parse(text.trim());
      } catch (ParseException e) {
         throw new FormatterException("Error when parsing date(" + dateFormat.toPattern() + ") from " + text, e);
      }
   }

   public String format(String format, Date object) throws FormatterException {
      SimpleDateFormat dateFormat = MANAGER.get().getDateFormat(format);

      return dateFormat.format(object);
   }

   static final class Manager {
      private Map m_map = new HashMap();

      public SimpleDateFormat getDateFormat(String format) {
         SimpleDateFormat dateFormat = m_map.get(format);

         if (dateFormat == null) {
            dateFormat = new SimpleDateFormat(format, Locale.US);
            m_map.put(format, dateFormat);
         }

         return dateFormat;
      }
   }
}