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.SettingEntity;
  import org.apache.commons.lang.StringUtils;
  
  import com.google.inject.Inject;
  import com.google.inject.Provider;
  import com.google.inject.Singleton;
  import com.google.inject.persist.Transactional;
  
  @Singleton
  public class SettingDAO {
  
    @Inject
    Provider<EntityManager> entityManagerProvider;
    @Inject
    DaoUtils daoUtils;
  
    /**
     * Find a setting with the given name.
     *
     * @param name - name of setting.
     * @return  a matching setting or null
     */
    @RequiresSession
    public SettingEntity findByName(String name) {
      if (StringUtils.isBlank(name)) {
        return null;
      }
      TypedQuery<SettingEntity> query = entityManagerProvider.get()
              .createNamedQuery("settingByName", SettingEntity.class);
      query.setParameter("name", name);
      return daoUtils.selectOne(query);
    }
  
    /**
     * Find all settings.
     *
     * @return all setting instances.
     */
    @RequiresSession
    public List<SettingEntity> findAll() {
      return daoUtils.selectAll(entityManagerProvider.get(), SettingEntity.class);
    }
  
    /**
     * Create a new setting entity.
     *
     * @param entity - entity to be created
     */
    @Transactional
    public void create(SettingEntity entity) {
      entityManagerProvider.get().persist(entity);
    }
  
    /**
     * Update setting instance.
     *
     * @param entity - entity to be updated.
     * @return - updated entity.
     */
    @Transactional
    public SettingEntity merge(SettingEntity entity) {
      return entityManagerProvider.get().merge(entity);
    }
  
    /**
     * Delete setting with given name.
     *
     * @param name - name of setting to be deleted.
     */
    @Transactional
    public void removeByName(String name) {
      SettingEntity entity = findByName(name);
      if (entity!= null) {
        entityManagerProvider.get().remove(entity);
      }
    }
  }
  