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.hive.service.cli.operation;
  
  import org.apache.hadoop.hive.ql.security.authorization.plugin.HiveOperationType;
  import org.apache.hive.service.cli.FetchOrientation;
  import org.apache.hive.service.cli.HiveSQLException;
  import org.apache.hive.service.cli.OperationState;
  import org.apache.hive.service.cli.OperationType;
  import org.apache.hive.service.cli.RowSet;
  import org.apache.hive.service.cli.RowSetFactory;
  import org.apache.hive.service.cli.TableSchema;
  import org.apache.hive.service.cli.session.HiveSession;
  
  /**
   * GetCatalogsOperation.
   *
   */
  public class GetCatalogsOperation extends MetadataOperation {
    private static final TableSchema RESULT_SET_SCHEMA = new TableSchema()
    .addStringColumn("TABLE_CAT", "Catalog name. NULL if not applicable.");
  
    private final RowSet rowSet;
  
    protected GetCatalogsOperation(HiveSession parentSession) {
      super(parentSession, OperationType.GET_CATALOGS);
      rowSet = RowSetFactory.create(RESULT_SET_SCHEMA, getProtocolVersion());
    }
  
    @Override
    public void runInternal() throws HiveSQLException {
      setState(OperationState.RUNNING);
      try {
        if (isAuthV2Enabled()) {
          authorizeMetaGets(HiveOperationType.GET_CATALOGS, null);
        }
        setState(OperationState.FINISHED);
      } catch (HiveSQLException e) {
        setState(OperationState.ERROR);
        throw e;
      }
  
    }
  
    /* (non-Javadoc)
     * @see org.apache.hive.service.cli.Operation#getResultSetSchema()
     */
    @Override
    public TableSchema getResultSetSchema() throws HiveSQLException {
      return RESULT_SET_SCHEMA;
    }
  
    /* (non-Javadoc)
     * @see org.apache.hive.service.cli.Operation#getNextRowSet(org.apache.hive.service.cli.FetchOrientation, long)
     */
    @Override
    public RowSet getNextRowSet(FetchOrientation orientation, long maxRows) throws HiveSQLException {
      assertState(OperationState.FINISHED);
      validateDefaultFetchOrientation(orientation);
      if (orientation.equals(FetchOrientation.FETCH_FIRST)) {
        rowSet.setStartOffset(0);
      }
      return rowSet.extractSubset((int)maxRows);
    }
  }
  