/*

  * $Source$

  * $Revision$

  *

  * Copyright (C) 2000 William Chesters

  *

  * Part of Melati (http://melati.org), a framework for the rapid

  * development of clean, maintainable web applications.

  *

  * Melati is free software; Permission is granted to copy, distribute

  * and/or modify this software under the terms either:

  *

  * a) the GNU General Public License as published by the Free Software

  *    Foundation; either version 2 of the License, or (at your option)

  *    any later version,

  *

  *    or

  *

  * b) any version of the Melati Software License, as published

  *    at http://melati.org

  *

  * You should have received a copy of the GNU General Public License and

  * the Melati Software License along with this program;

  * if not, write to the Free Software Foundation, Inc.,

  * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA to obtain the

  * GNU General Public License and visit http://melati.org to obtain the

  * Melati Software License.

  *

  * Feel free to contact the Developers of Melati (http://melati.org),

  * if you would like to work out a different arrangement than the options

  * outlined here.  It is our intention to allow Melati to be used by as

  * wide an audience as possible.

  *

  * This program is distributed in the hope that it will be useful,

  * but WITHOUT ANY WARRANTY; without even the implied warranty of

  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

  * GNU General Public License for more details.

  *

  * Contact details for copyright holder:

  *

  *     William Chesters <williamc At paneris.org>

  *     http://paneris.org/~williamc

  *     Obrechtstraat 114, 2517VX Den Haag, The Netherlands

  */

 package org.melati.template;

 import java.sql.Date;

 import java.text.SimpleDateFormat;

 import java.text.ParsePosition;

 import org.melati.poem.Field;

 import org.melati.servlet.Form;

 /**

  * A SimpleDateAdaptor is used to format a date field into 

  * a dd/mm/yyyy format for display. 

  *

  * It also adapts the input (given in dd/mm/yyyy or yyyyMMdd)

  * back to a java.sql.Date.

  */

 public class SimpleDateAdaptor implements TempletAdaptor {

   /** The instance. */

   public static final SimpleDateAdaptor it = new SimpleDateAdaptor();

   private static SimpleDateFormat dateFormatter1 = 

       new SimpleDateFormat("dd/MM/yyyy");

   // allow other forms of date - this one yyyyMMdd

   private static SimpleDateFormat dateFormatter2 =

       new SimpleDateFormat("yyyyMMdd");

   @Override

   public Object rawFrom(ServletTemplateContext context, String fieldName) {

     String value = Form.getFieldNulled(context,fieldName);

     if (value == null) return null;

     java.util.Date date = dateFormatter1.parse(value, new ParsePosition(0));

     // give it another go using a different format

     if (date == null)

       date = dateFormatter2.parse(value, new ParsePosition(0));

     return new Date(date.getTime());

   }

   /**

    * @param dateField the input Field

    * @return the rendered String

    */

   public String rendered(Field<Date> dateField) {

     return dateField.getRaw() == null ?

                "" :

                dateFormatter1.format((java.util.Date)dateField.getRaw());

   }

 }