package org.apache.ojb.broker.accesslayer.sql;

 /* 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.metadata.ClassDescriptor;

 import org.apache.ojb.broker.metadata.FieldDescriptor;

 import org.apache.ojb.broker.platforms.Platform;

 import org.apache.ojb.broker.query.Criteria;

 import org.apache.ojb.broker.query.Query;

 import org.apache.ojb.broker.query.QueryByCriteria;

 import org.apache.ojb.broker.util.logging.Logger;

 /**

  * Model a SELECT Statement by Primary Key

  *

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

  * @version $Id: SqlSelectByPkStatement.java,v 1.1 2007-08-24 22:17:39 ewestfal Exp $

  */

 public class SqlSelectByPkStatement extends SqlSelectStatement

 {

     /**

      * Constructor for SqlSelectByPkStatement.

      *

      * @param cld

      * @param logger

      */

     public SqlSelectByPkStatement(Platform pf, ClassDescriptor cld, Logger logger)

     {

         super(pf, cld, buildQuery(cld), logger);

     }

     /**

      * Build a Pk-Query base on the ClassDescriptor.

      *

      * @param cld

      * @return a select by PK query

      */

     private static Query buildQuery(ClassDescriptor cld)

     {

         FieldDescriptor[] pkFields = cld.getPkFields();

         Criteria crit = new Criteria();

         for(int i = 0; i < pkFields.length; i++)

         {

             crit.addEqualTo(pkFields[i].getAttributeName(), null);

         }

         return new QueryByCriteria(cld.getClassOfObject(), crit);

     }

 }