/*

  * Copyright 2007-2008 The Kuali Foundation

  * 

  * Licensed under the Educational Community 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.opensource.org/licenses/ecl2.php

  * 

  * 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.

  */

 package org.kuali.rice.kns.dao.impl;

 import java.util.ArrayList;

 import java.util.List;

 import javax.persistence.EntityManager;

 import javax.persistence.PersistenceContext;

 import org.kuali.rice.core.framework.persistence.jpa.criteria.Criteria;

 import org.kuali.rice.core.framework.persistence.jpa.criteria.QueryByCriteria;

 import org.kuali.rice.kns.bo.Attachment;

 import org.kuali.rice.kns.bo.Note;

 import org.kuali.rice.kns.dao.NoteDao;

 import org.springframework.dao.DataAccessException;

 /**

  * This class is the JPA implementation of the NoteDao interface.

  * 

  * @author Kuali Rice Team (rice.collab@kuali.org)

  */

 public class NoteDaoJpa implements NoteDao {

         @PersistenceContext

         private EntityManager entityManager;

         /**

          * Saves a note to the DB using JPA.

          */

         public void save(Note note) throws DataAccessException {

                 if (note != null && note.getNoteIdentifier() == null && note.getAttachment() != null) {

                         Attachment attachment = note.getAttachment();

                         note.setAttachment(null);

                         // store without attachment

                         entityManager.merge(note);

                         attachment.setNoteIdentifier(note.getNoteIdentifier());

                         // put attachment back

                         note.setAttachment(attachment);

                 }

                 entityManager.merge(note);

         }

         /**

          * Deletes a note from the DB using JPA.

          */

         public void deleteNote(Note note) throws DataAccessException {

                 entityManager.remove(note.getAttachment());

                 note.setAttachment(null);

                 entityManager.remove(note);

         }

         /**

          * Retrieves document associated with a given object using JPA.

          */

         public List<Note> findByremoteObjectId(String remoteObjectId) {

                 Criteria criteria = new Criteria(Note.class.getName());

                 // TODO: Notes - Chris move remoteObjectId string to constants

                 criteria.eq("remoteObjectIdentifier", remoteObjectId);

                 criteria.orderBy("notePostedTimestamp", true);

                 return new ArrayList<Note>(new QueryByCriteria(entityManager, criteria).toQuery().getResultList());

         }

          public Note getNoteByNoteId(Long noteId) {

                  Criteria criteria = new Criteria(Note.class.getName());

                  criteria.eq("noteIdentifier", noteId);

              return (Note) new QueryByCriteria(entityManager, criteria).toQuery().getSingleResult();

             }

     /**

      * @return the entityManager

      */

     public EntityManager getEntityManager() {

         return this.entityManager;

     }

     /**

      * @param entityManager the entityManager to set

      */

     public void setEntityManager(EntityManager entityManager) {

         this.entityManager = entityManager;

     }

 }