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.view;
  
  import java.util.List;
  
  import jakarta.inject.Inject;
  import jakarta.inject.Singleton;
  
  import org.apache.ambari.server.orm.dao.PrivilegeDAO;
  import org.apache.ambari.server.orm.dao.ViewDAO;
  import org.apache.ambari.server.orm.dao.ViewInstanceDAO;
  import org.apache.ambari.server.orm.entities.PrincipalEntity;
  import org.apache.ambari.server.orm.entities.PrivilegeEntity;
  import org.apache.ambari.server.orm.entities.ViewEntity;
  import org.apache.ambari.server.orm.entities.ViewInstanceEntity;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  @Singleton
  public class ViewInstanceOperationHandler {
    private final static Logger LOG = LoggerFactory.getLogger(ViewInstanceOperationHandler.class);
  
    @Inject
    ViewDAO viewDAO;
  
    /**
     * View instance data access object.
     */
    @Inject
    ViewInstanceDAO instanceDAO;
  
    /**
     * Privilege data access object.
     */
    @Inject
    PrivilegeDAO privilegeDAO;
  
    // remove a privilege entity.
    private void removePrivilegeEntity(PrivilegeEntity privilegeEntity) {
  
      PrincipalEntity principalEntity = privilegeEntity.getPrincipal();
      if (principalEntity != null) {
        principalEntity.removePrivilege(privilegeEntity);
      }
  
      privilegeDAO.remove(privilegeEntity);
    }
  
    public void uninstallViewInstance(ViewInstanceEntity instanceEntity) {
      LOG.info("uninstalling ViewInstance : {} ", instanceEntity);
      ViewEntity viewEntity = viewDAO.findByName(instanceEntity.getViewName());
      LOG.info("viewEntity received corresponding to the view entity : {} ", viewEntity);
  
      if (viewEntity != null) {
        String instanceName = instanceEntity.getName();
        String viewName = viewEntity.getCommonName();
        String version = viewEntity.getVersion();
  
        ViewInstanceEntity instanceDefinition = instanceDAO.findByName(instanceEntity.getViewName(), instanceEntity.getName()); //getInstanceDefinition(viewName, version, instanceName);
        LOG.debug("view instance entity received from database : {}", instanceDefinition);
        if (instanceDefinition != null) {
          if (instanceDefinition.isXmlDriven()) {
            throw new IllegalStateException("View instances defined via xml can't be deleted through api requests");
          }
          List<PrivilegeEntity> instancePrivileges = privilegeDAO.findByResourceId(instanceEntity.getResource().getId());
          LOG.info("Removing privilege entities : {}", instancePrivileges);
          for (PrivilegeEntity privilegeEntity : instancePrivileges) {
            removePrivilegeEntity(privilegeEntity);
          }
          LOG.info("Deleting view instance : view name : {}, version : {}, instanceName : {}", viewName, version, instanceName);
          instanceDAO.remove(instanceDefinition);
        }else{
          throw new IllegalStateException("View instance '" + instanceEntity.getName() + "' not found.");
        }
      }else{
        throw new IllegalStateException("View '" + instanceEntity.getViewName() + "' not found corresponding to view instance '" + instanceEntity.getName() + "'");
      }
    }
  }
  