/*
    * 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.attributetype;
  
  import java.sql.SQLException;
  import java.util.ArrayList;
  import java.util.List;
  
  import org.efaps.admin.datamodel.Attribute;
  import org.efaps.db.wrapper.AbstractSQLInsertUpdate;
  import org.efaps.util.EFapsException;
  
  /**
   * Implements the mapping between values in the database and {@link String}
   * values in eFaps.
  
   * @author The eFaps Team
   * @version $Id$
   */
  public class StringType
      extends AbstractType
  {
      /**
       * Needed for serialization.
       */
      private static final long serialVersionUID = 1L;
  
      /**
       * {@inheritDoc}
       */
      @Override
      protected void prepare(final AbstractSQLInsertUpdate<?> _insertUpdate,
                             final Attribute _attribute,
                             final Object... _values)
          throws SQLException
      {
          checkSQLColumnSize(_attribute, 1);
          _insertUpdate.column(_attribute.getSqlColNames().get(0), eval(_values));
      }
  
      /**
       * The localized string and the internal string value are equal. So the
       * internal value can be set directly with method {@link #setValue}.
       *
       * @param _values   values to evaluate
       * @return string representation for the <code>_values</code>
       */
      protected String eval(final Object[] _values)
      {
          final String ret;
          if ((_values == null) || (_values.length == 0) || (_values[0] == null))  {
              ret = null;
          } else if (_values[0] instanceof String) {
              ret = (String) _values[0];
          } else if (_values[0] != null) {
              ret = _values[0].toString();
          } else  {
              ret = null;
          }
          return ret;
      }
  
      /**
       * {@inheritDoc}
       */
      @Override
      public Object readValue(final Attribute _attribute,
                              final List<Object> _objectList)
          throws EFapsException
      {
          Object ret = null;
          if (_objectList.size() < 1) {
              ret = null;
          } else if (_objectList.size() > 1) {
              final List<String> list = new ArrayList<String>();
              for (final Object object : _objectList) {
                  list.add(object == null ? "" : object.toString().trim());
              }
              ret = list;
          } else {
              final Object object = _objectList.get(0);
             ret = object == null ? "" : object.toString().trim();
         }
         return ret;
     }
 
     /**
      * {@inheritDoc}
      */
     @Override
     public String toString4Where(final Object _value)
         throws EFapsException
     {
         String ret = "";
         if (_value instanceof String) {
             ret = (String) _value;
         } else if (_value != null) {
             ret = _value.toString();
         }
         return ret;
     }
 }