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.ViewURLEntity;
  
  import com.google.common.base.Optional;
  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 ViewURLDAO {
    /**
     * JPA entity manager
     */
    @Inject
    private Provider<EntityManager> entityManagerProvider;
  
    /**
     * Find all view instances.
     *
     * @return all views or an empty List
     */
    @RequiresSession
    public List<ViewURLEntity> findAll() {
      TypedQuery<ViewURLEntity> query = entityManagerProvider.get().
          createNamedQuery("allViewUrls", ViewURLEntity.class);
  
      return query.getResultList();
    }
  
    /**
     * Find URL by name
     * @param urlName
     * @return
       */
    @RequiresSession
    public Optional<ViewURLEntity> findByName(String urlName) {
      TypedQuery<ViewURLEntity> query = entityManagerProvider.get().
              createNamedQuery("viewUrlByName", ViewURLEntity.class);
      query.setParameter("urlName", urlName);
      try {
        return Optional.of(query.getSingleResult());
      } catch (Exception e){
        return Optional.absent();
      }
    }
  
    /**
     * Find URL by suffix
     *
     * @param urlSuffix
     *          the suffix to get the URL by
     * @return <code>Optional.absent()</code> if no view URL with the given suffix;
     *         otherwise an appropriate <code>Optional</code> instance holding the
     *         fetched view URL
     */
    @RequiresSession
    public Optional<ViewURLEntity> findBySuffix(String urlSuffix) {
      TypedQuery<ViewURLEntity> query = entityManagerProvider.get().createNamedQuery("viewUrlBySuffix", ViewURLEntity.class);
      query.setParameter("urlSuffix", urlSuffix);
      try {
        return Optional.of(query.getSingleResult());
      } catch (NoResultException e) {
        return Optional.absent();
      }
    }
  
    /**
     * Save a URL entity
     * @param urlEntity
       */
    @Transactional
    public void save(ViewURLEntity urlEntity) {
      entityManagerProvider.get().persist(urlEntity);
      // Reverse mappings are not automatically flushed for some reason
      entityManagerProvider.get().flush();
    }
  
    /**
     * Update and merge a URL entity
     * @param entity
       */
    @Transactional
    public void update(ViewURLEntity entity) {
      entityManagerProvider.get().merge(entity);
      entityManagerProvider.get().flush();
  
    }
  
    /**
     * Remove a URL entity
     * @param urlEntity
       */
    @Transactional
    public void delete(ViewURLEntity urlEntity) {
      entityManagerProvider.get().remove(urlEntity);
      entityManagerProvider.get().flush();
    }
  }
  