/**
    * Copyright 2011-2013 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.osedu.org/licenses/ECL-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.
   */
  
  package org.kuali.mobility.writer.dao;
  
  import org.kuali.mobility.writer.entity.Topic;
  import org.springframework.stereotype.Repository;
  import org.springframework.transaction.annotation.Transactional;
  
  import javax.persistence.EntityManager;
  import javax.persistence.PersistenceContext;
  import javax.persistence.Query;
  import java.util.List;
  
  /**
   * Implementation for the TopicDao
   * @author Kuali Mobility Team (mobility.collab@kuali.org)
   * @since 3.0.0
   */
  @Repository
  public class TopicDaoImpl implements TopicDao{
  
  	@PersistenceContext
  	private EntityManager entityManager;
  
  	public EntityManager getEntityManager() {
  		return entityManager;
  	}
  
  	public void setEntityManager(EntityManager entityManager) {
  		this.entityManager = entityManager;
  	}
  
  
  	@Override
  	public List<Topic> getTopics() {
  		Query query = getEntityManager().createNamedQuery("Topic.getTopics");
  		return query.getResultList();
  	}
  
  
  	@Override
  	public Topic getTopic(long topicId) {
  		return getEntityManager().find(Topic.class, topicId);
  	}
  
      @Override
      @Transactional
      public Topic saveTopic(Topic topic) {
  
          if(topic.getId() == null){
              entityManager.persist(topic);
              return topic;
          }
          else{
              return entityManager.merge(topic);
          }
  
      }
  
  
  }