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
   * <p/>
   * http://www.apache.org/licenses/LICENSE-2.0
   * <p/>
   * 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.atlas.hive.hook.events;
  
  import org.apache.atlas.hive.hook.AtlasHiveHookContext;
  import org.apache.atlas.model.instance.AtlasObjectId;
  import org.apache.atlas.model.notification.HookNotification;
  import org.apache.atlas.model.notification.HookNotification.EntityDeleteRequestV2;
  import org.apache.commons.collections.CollectionUtils;
  import org.apache.hadoop.hive.metastore.events.DropTableEvent;
  import org.apache.hadoop.hive.ql.hooks.Entity;
  import org.apache.hadoop.hive.ql.metadata.Table;
  
  import java.util.ArrayList;
  import java.util.Collections;
  import java.util.List;
  
  public class DropTable extends BaseHiveEvent {
      public DropTable(AtlasHiveHookContext context) {
          super(context);
      }
  
      @Override
      public List<HookNotification> getNotificationMessages() {
          List<HookNotification> ret      = null;
          List<AtlasObjectId>    entities = context.isMetastoreHook() ? getHiveMetastoreEntities() : getHiveEntities();
  
          if (CollectionUtils.isNotEmpty(entities)) {
              ret = new ArrayList<>(entities.size());
  
              for (AtlasObjectId entity : entities) {
                  ret.add(new EntityDeleteRequestV2(getUserName(), Collections.singletonList(entity)));
              }
          }
  
          return ret;
      }
  
      public List<AtlasObjectId> getHiveMetastoreEntities() {
          List<AtlasObjectId> ret      = new ArrayList<>();
          DropTableEvent      tblEvent = (DropTableEvent) context.getMetastoreEvent();
          Table               table    = new Table(tblEvent.getTable());
          String              tblQName = getQualifiedName(table);
          AtlasObjectId       tblId    = new AtlasObjectId(HIVE_TYPE_TABLE, ATTRIBUTE_QUALIFIED_NAME, tblQName);
  
          context.removeFromKnownTable(tblQName);
  
          ret.add(tblId);
  
          return ret;
      }
  
      public List<AtlasObjectId> getHiveEntities() {
          List<AtlasObjectId> ret = new ArrayList<>();
  
          for (Entity entity : getOutputs()) {
              if (entity.getType() == Entity.Type.TABLE) {
                  String        tblQName = getQualifiedName(entity.getTable());
                  AtlasObjectId tblId    = new AtlasObjectId(HIVE_TYPE_TABLE, ATTRIBUTE_QUALIFIED_NAME, tblQName);
  
                  context.removeFromKnownTable(tblQName);
  
                  ret.add(tblId);
              }
          }
  
          return ret;
      }
  }