/*
    * 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.List;
  
  import org.efaps.admin.EFapsSystemConfiguration;
  import org.efaps.admin.KernelSettings;
  import org.efaps.admin.datamodel.Attribute;
  import org.efaps.admin.user.Group;
  import org.efaps.db.Context;
  import org.efaps.db.wrapper.AbstractSQLInsertUpdate;
  import org.efaps.util.EFapsException;
  
  /**
   * The class is the attribute type representation for the group of a business
   * object.
   *
   * @author The eFaps Team
   * @version $Id$
   */
  public class GroupLinkType
      extends PersonLinkType
  {
      /**
       * Needed for serialization.
       */
      private static final long serialVersionUID = 1L;
  
      /**
       * @param _insertUpdate insert / update SQL statement
       * @param _attribute Attribute to be prepared
       * @param _values values for the insert or update
       * @throws SQLException if not exact one SQL column for the attribute is
       *             defined of the company id could not be fetched
       */
      @Override
      protected void prepare(final AbstractSQLInsertUpdate<?> _insertUpdate,
                             final Attribute _attribute,
                             final Object... _values)
          throws SQLException
      {
          checkSQLColumnSize(_attribute, 1);
          // if a value was explicitly set the value is used, else the first
          // group for the logged in Person will be used
          if ((_values != null) && (_values.length > 0) && _values[0] != null) {
              if (_values[0] instanceof Long) {
                  _insertUpdate.column(_attribute.getSqlColNames().get(0), (Long) _values[0]);
              } else {
                  _insertUpdate.column(_attribute.getSqlColNames().get(0), Long.parseLong(_values[0].toString()));
              }
          } else {
              try {
                  if (Context.getThreadContext().getPerson() != null
                                  && !Context.getThreadContext().getPerson().getGroups().isEmpty()) {
                      _insertUpdate.column(_attribute.getSqlColNames().get(0),
                                      Context.getThreadContext().getPerson().getGroups().iterator().next());
  
                  } else if (EFapsSystemConfiguration.get().getAttributeValueAsBoolean(KernelSettings.ACTIVATE_GROUPS)) {
                      throw new SQLException("Groups are activated in Systemconfiguration but no Group set.");
                  }
              } catch (final EFapsException e) {
                  throw new SQLException("could not fetch group id", e);
              }
          }
      }
  
      /**
       * {@inheritDoc}
       */
      @Override
      public Object readValue(final Attribute _attribute,
                              final List<Object> _objectList)
          throws EFapsException
      {
          Object ret = null;
          final Object obj = _objectList.get(0);
          if (obj != null) {
              long id = 0;
              if (obj instanceof Number) {
                 id = ((Number) obj).longValue();
             } else if (obj != null) {
                 id = Long.parseLong(obj.toString());
             }
             ret = Group.get(id);
         }
         return ret;
     }
 
 }