/**
    * Copyright 2011 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.configparams.dao;
  
  import java.util.List;
  
  import javax.persistence.EntityManager;
  import javax.persistence.OptimisticLockException;
  import javax.persistence.PersistenceContext;
  import javax.persistence.Query;
  
  import org.kuali.mobility.configparams.entity.ConfigParam;
  import org.springframework.stereotype.Repository;
  
  /**
   * DAO to actually perform manipulation of ConfigParam objects
   * @author Kuali Mobility Team (moblitiy.collab@kuali.org)
   */
  @Repository
  public class ConfigParamDaoImpl implements ConfigParamDao {
  
      @PersistenceContext
      private EntityManager entityManager;
      
      public void deleteConfigParamById(Long id) {
          Query query = entityManager.createQuery("delete from ConfigParam cp where cp.configParamId = :id");
          query.setParameter("id", id);
          query.executeUpdate();
      }
  
      @SuppressWarnings("unchecked")
      public List<ConfigParam> findAllConfigParam() {
          Query query = entityManager.createQuery("select cp from ConfigParam cp order by cp.name");
          return query.getResultList();
      }
  
      public ConfigParam findConfigParamById(Long id) {
          Query query = entityManager.createQuery("select cp from ConfigParam cp where cp.configParamId = :id");
          query.setParameter("id", id);
          return (ConfigParam) query.getSingleResult();
      }
      
      public ConfigParam findConfigParamByName(String name) {
          Query query = entityManager.createQuery("select cp from ConfigParam cp where cp.name like :name");
          query.setParameter("name", name);
          return (ConfigParam) query.getSingleResult();
      }
  
      public Long saveConfigParam(ConfigParam configParam) {
          if (configParam == null) {
              return null;
          }
          if (configParam.getName() != null) {
              configParam.setName(configParam.getName().trim());
          }
          if (configParam.getValue() != null) {
              configParam.setValue(configParam.getValue().trim());
          }
          try {
  	        if (configParam.getConfigParamId() == null) {
  	            entityManager.persist(configParam);
  	        } else {
  	            entityManager.merge(configParam);
  	        }
          } catch (OptimisticLockException oe) {
              return null;
          }
          return configParam.getConfigParamId();
      }
      
      public EntityManager getEntityManager() {
          return entityManager;
      }
  
      public void setEntityManager(EntityManager entityManager) {
          this.entityManager = entityManager;
      }
      
  }