/**
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.
*/
package org.apache.ambari.server.orm.dao;
import java.util.List;
import javax.persistence.EntityManager;
import javax.persistence.TypedQuery;
import org.apache.ambari.server.orm.RequiresSession;
import org.apache.ambari.server.orm.entities.ViewEntity;
import com.google.common.collect.Lists;
import com.google.inject.Inject;
import com.google.inject.Provider;
import com.google.inject.Singleton;
import com.google.inject.persist.Transactional;
/**
* View Data Access Object.
*/
@Singleton
public class ViewDAO {
/**
* JPA entity manager
*/
@Inject
Provider<EntityManager> entityManagerProvider;
/**
* Find a view with a given name.
*
* @param viewName name of view to find
*
* @return a matching view or null
*/
@RequiresSession
public ViewEntity findByName(String viewName) {
return entityManagerProvider.get().find(ViewEntity.class, viewName);
}
/**
* Find a view with a given common name.
*
* @param viewCommonName common name of view to find
*
* @return a matching view or null
*/
@RequiresSession
public List<ViewEntity> findByCommonName(String viewCommonName) {
List<ViewEntity> list = Lists.newArrayList();
if (viewCommonName != null) {
for (ViewEntity viewEntity : findAll()) {
if (viewCommonName.equals(viewEntity.getCommonName())) {
list.add(viewEntity);
}
}
}
return list;
}
/**
* Find all views.
*
* @return all views or an empty List
*/
@RequiresSession
public List<ViewEntity> findAll() {
TypedQuery<ViewEntity> query = entityManagerProvider.get().
createNamedQuery("allViews", ViewEntity.class);
return query.getResultList();
}
/**
* Refresh the state of the instance from the database,
* overwriting changes made to the entity, if any.
*
* @param ViewEntity entity to refresh
*/
@Transactional
public void refresh(ViewEntity ViewEntity) {
entityManagerProvider.get().refresh(ViewEntity);
}
/**
* Make an instance managed and persistent.
*
* @param ViewEntity entity to store
*/
@Transactional
public void create(ViewEntity ViewEntity) {
entityManagerProvider.get().persist(ViewEntity);
}
/**
* Merge the state of the given entity into the current persistence context.
*
* @param ViewEntity entity to merge
* @return the merged entity
*/
@Transactional
public ViewEntity merge(ViewEntity ViewEntity) {
return entityManagerProvider.get().merge(ViewEntity);
}
/**
* Remove the entity instance.
*
* @param ViewEntity entity to remove
*/
@Transactional
public void remove(ViewEntity ViewEntity) {
entityManagerProvider.get().remove(merge(ViewEntity));
}
}