package org.apache.ojb.broker.accesslayer;

 /* Copyright 2002-2005 The Apache Software Foundation

  *

  * 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.

  */

 import org.apache.ojb.broker.Identity;

 import org.apache.ojb.broker.PersistenceBrokerException;

 import org.apache.ojb.broker.core.PersistenceBrokerImpl;

 /**

  * RsIterator based on SQL-Statement

  *

  * @author <a href="mailto:jbraeuchi@hotmail.com">Jakob Braeuchi</a>

  * @version $Id: SqlBasedRsIterator.java,v 1.1 2007-08-24 22:17:30 ewestfal Exp $

  */

 public class SqlBasedRsIterator extends RsIterator

 {

     /**

      * SqlBasedRsIterator constructor.

      */

     public SqlBasedRsIterator(RsQueryObject queryObject, PersistenceBrokerImpl broker)

             throws PersistenceBrokerException

     {

         super(queryObject, broker);

         if(!queryObject.isSQLBased())

         {

             throw new PersistenceBrokerException("Given query is not a QueryBySQL object");

         }

     }

     /**

      * returns a proxy or a fully materialized Object from the current row of the

      * underlying resultset.

      */

     protected Object getObjectFromResultSet() throws PersistenceBrokerException

     {

         try

         {

             // if all primitive attributes of the object are contained in the ResultSet

             // the fast direct mapping can be used

             return super.getObjectFromResultSet();

         }

                 // if the full loading failed we assume that at least PK attributes are contained

                 // in the ResultSet and perform a slower Identity based loading...

                 // This may of course also fail and can throw another PersistenceBrokerException

         catch (PersistenceBrokerException e)

         {

             Identity oid = getIdentityFromResultSet();

             return getBroker().getObjectByIdentity(oid);

         }

     }

 }