/*
    * Copyright 2003 - 2013 The eFaps Team
    *
    * Licensed under the Apache License, Version 2.0 (the "License");
    * you may not use this file except in compliance with the License.
    * You may obtain a copy of the License at
    *
    *     http://www.apache.org/licenses/LICENSE-2.0
    *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   *
   * Revision:        $Rev$
   * Last Changed:    $Date$
   * Last Changed By: $Author$
   */
  
  package org.efaps.admin.datamodel.ui;
  
  import org.efaps.db.Context;
  import org.efaps.util.EFapsException;
  import org.joda.time.DateTime;
  import org.joda.time.DateTimeComparator;
  import org.joda.time.format.DateTimeFormat;
  import org.joda.time.format.DateTimeFormatter;
  
  /**
   * Class to represent a DateTime for the user interface.
   *
   * @author The eFaps Team
   * @version $Id$
   */
  public class DateTimeUI
      extends AbstractUI
  {
  
      /**
       * Needed for serialization.
       */
      private static final long serialVersionUID = 1L;
  
      /**
       *  {@inheritDoc}
       */
      @Override
      public String getReadOnlyHtml(final FieldValue _fieldValue)
          throws EFapsException
      {
          String ret = null;
  
          if (_fieldValue.getValue() instanceof DateTime) {
              final DateTime datetime = (DateTime) _fieldValue.getValue();
              if (datetime != null) {
                  final DateTimeFormatter formatter = DateTimeFormat.mediumDateTime();
                  // format the Date with the Locale and Chronology from the user
                  // context
                  ret = datetime.withChronology(Context.getThreadContext().getChronology()).toString(
                                  formatter.withLocale(Context.getThreadContext().getLocale()));
              }
          } else if (_fieldValue.getValue() instanceof String) {
              ret = (String) _fieldValue.getValue();
          } else if (_fieldValue.getValue() != null) {
              throw new EFapsException(this.getClass(), "getViewHtml.noDateTime", (Object[]) null);
          }
          return ret;
      }
  
      /**
       * {@inheritDoc}
       */
      @Override
      public String getStringValue(final FieldValue _fieldValue)
          throws EFapsException
      {
          String ret = null;
          if (_fieldValue.getValue() != null) {
              ret = _fieldValue.getValue().toString();
          }
          return ret;
      }
  
      /**
       *  {@inheritDoc}
       */
      @Override
      public Object getObject4Compare(final FieldValue _fieldValue)
          throws EFapsException
      {
          Object ret;
          if (_fieldValue != null && _fieldValue.getValue() instanceof DateTime) {
              final DateTime datetime = (DateTime) _fieldValue.getValue();
              ret = datetime.withChronology(Context.getThreadContext().getChronology());
          } else {
              ret = _fieldValue.getValue();
          }
          return ret;
     }
 
     /**
      *  {@inheritDoc}
      */
     @Override
     public int compare(final FieldValue _fieldValue,
                        final FieldValue _fieldValue2)
     {
         int ret = 0;
         if (_fieldValue.getValue() instanceof DateTime && _fieldValue2.getValue() instanceof DateTime) {
             ret = DateTimeComparator.getInstance().compare(_fieldValue.getValue(), _fieldValue2.getValue());
         }
         return ret;
     }
 
     /**
      * {@inheritDoc}
      */
     @Override
     public Object format(final Object _object,
                          final String _pattern)
         throws EFapsException
     {
         Object ret;
         if (_object instanceof DateTime) {
             ret = ((DateTime) _object).toString(_pattern, Context.getThreadContext().getLocale());
         } else {
             ret = _object;
         }
         return ret;
     }
 }