content: /*
   * 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 jakarta.persistence.EntityManager;
  import jakarta.persistence.NoResultException;
  import jakarta.persistence.TypedQuery;
  
  import org.apache.ambari.server.orm.RequiresSession;
  import org.apache.ambari.server.orm.entities.ResourceEntity;
  import org.apache.ambari.server.orm.entities.ViewInstanceDataEntity;
  import org.apache.ambari.server.orm.entities.ViewInstanceEntity;
  
  import com.google.inject.Inject;
  import com.google.inject.Provider;
  import com.google.inject.Singleton;
  import com.google.inject.persist.Transactional;
  
  /**
   * View Instance Data Access Object.
   */
  @Singleton
  public class ViewInstanceDAO {
    /**
     * JPA entity manager
     */
    @Inject
    Provider<EntityManager> entityManagerProvider;
    @Inject
    DaoUtils daoUtils;
  
    /**
     * Find a view with the given names.
     *
     * @param viewName      name of view
     * @param instanceName  name of the instance
     *
     * @return  a matching view instance or null
     */
    @RequiresSession
    public ViewInstanceEntity findByName(String viewName, String instanceName) {
      TypedQuery<ViewInstanceEntity> query = entityManagerProvider.get().createQuery(
        "SELECT instance FROM ViewInstanceEntity instance WHERE instance.viewName = ?1 AND instance.name = ?2",
        ViewInstanceEntity.class);
      return daoUtils.selectSingle(query, viewName, instanceName);
    }
  
    /**
     * Find a view instance by given resource id.
     *
     * @param resourceId resource id
     * @return a matching view instance or null
     */
    @RequiresSession
    public ViewInstanceEntity findByResourceId(long resourceId) {
      TypedQuery<ViewInstanceEntity> query = entityManagerProvider.get().createNamedQuery("viewInstanceByResourceId", ViewInstanceEntity.class);
      query.setParameter("resourceId", resourceId);
      try {
        return query.getSingleResult();
      } catch (NoResultException ignored) {
        return null;
      }
    }
  
    /**
     * Find all view instances.
     *
     * @return all views or an empty List
     */
    @RequiresSession
    public List<ViewInstanceEntity> findAll() {
      TypedQuery<ViewInstanceEntity> query = entityManagerProvider.get().
          createNamedQuery("allViewInstances", ViewInstanceEntity.class);
  
      return query.getResultList();
    }
  
    /**
     * Gets the associated {@link ResourceEntity} for a given instance.
     *
     * @param viewName
     *          the name of the view
     * @param instanceName
     *          the name of the view instance
     *
     * @return the associated resource entity or {@code null}.
     */
    @RequiresSession
    public ResourceEntity findResourceForViewInstance(String viewName,
        String instanceName) {
      TypedQuery<ResourceEntity> query = entityManagerProvider.get().createNamedQuery(
          "getResourceIdByViewInstance", ResourceEntity.class);
  
      query.setParameter("viewName", viewName);
      query.setParameter("instanceName", instanceName);
  
      return daoUtils.selectOne(query);
    }
  
    /**
     * Refresh the state of the instance from the database,
     * overwriting changes made to the entity, if any.
     *
     * @param viewInstanceEntity  entity to refresh
     */
    @Transactional
    public void refresh(ViewInstanceEntity viewInstanceEntity) {
      entityManagerProvider.get().refresh(viewInstanceEntity);
    }
  
    /**
     * Make an instance managed and persistent.
     *
     * @param viewInstanceEntity  entity to persist
     */
    @Transactional
    public void create(ViewInstanceEntity viewInstanceEntity) {
      entityManagerProvider.get().persist(viewInstanceEntity);
    }
  
    /**
     * Merge the state of the given entity into the current persistence context.
     *
     * @param viewInstanceEntity  entity to merge
     * @return the merged entity
     */
    @Transactional
    public ViewInstanceEntity merge(ViewInstanceEntity viewInstanceEntity) {
      return entityManagerProvider.get().merge(viewInstanceEntity);
    }
  
    /**
     * Remove the entity instance.
     *
     * @param viewInstanceEntity  entity to remove
     */
    @Transactional
    public void remove(ViewInstanceEntity viewInstanceEntity) {
      entityManagerProvider.get().remove(merge(viewInstanceEntity));
    }
  
    /**
     * Merge the state of the given entity data into the current persistence context.
     *
     * @param viewInstanceDataEntity  entity to merge
     * @return the merged entity
     */
    @Transactional
    public ViewInstanceDataEntity mergeData(ViewInstanceDataEntity viewInstanceDataEntity) {
      return entityManagerProvider.get().merge(viewInstanceDataEntity);
    }
  
    /**
     * Remove the entity instance data.
     *
     * @param viewInstanceDataEntity  entity to remove
     */
    @Transactional
    public void removeData(ViewInstanceDataEntity viewInstanceDataEntity) {
      entityManagerProvider.get().remove(mergeData(viewInstanceDataEntity));
    }
  }
  