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.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));
    }
  }
  