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/**
 * 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.hadoop.hive.metastore;

import java.util.List;

import org.apache.hadoop.hive.common.classification.InterfaceAudience.LimitedPrivate;
import org.apache.hadoop.hive.common.classification.InterfaceStability.Evolving;
import org.apache.hadoop.hive.metastore.api.Database;
import org.apache.hadoop.hive.metastore.api.Index;
import org.apache.hadoop.hive.metastore.api.MetaException;
import org.apache.hadoop.hive.metastore.api.NoSuchObjectException;
import org.apache.hadoop.hive.metastore.api.Partition;
import org.apache.hadoop.hive.metastore.api.PartitionSpec;
import org.apache.hadoop.hive.metastore.api.Table;

/**
 * Metadata filter hook for metastore client. This will be useful for authorization
 * plugins on hiveserver2 to filter metadata results, especially in case of
 * non-impersonation mode where the metastore doesn't know the end user's identity.
 */
@LimitedPrivate(value = { "Apache Sentry (Incubating)" })
@Evolving
public interface MetaStoreFilterHook {

  /**
   * Filter given list of databases
   * @param dbList
   * @return List of filtered Db names
   */
  public List filterDatabases(List dbList) throws MetaException;

  /**
   * filter to given database object if applicable
   * @param dataBase
   * @return the same database if it's not filtered out
   * @throws NoSuchObjectException
   */
  public Database filterDatabase(Database dataBase) throws MetaException, NoSuchObjectException;

  /**
   * Filter given list of tables
   * @param dbName
   * @param tableList
   * @returnList of filtered table names
   */
  public List filterTableNames(String dbName, List tableList) throws MetaException;

  /**
   * filter to given table object if applicable
   * @param table
   * @return the same table if it's not filtered out
   * @throws NoSuchObjectException
   */
  public Table filterTable(Table table) throws MetaException, NoSuchObjectException;

  /**
   * Filter given list of tables
   * @param dbName
   * @param tableList
   * @returnList of filtered table names
   */
  public List filterTables(List
tableList) throws MetaException; /** * Filter given list of partitions * @param partitionList * @return */ public List filterPartitions(List partitionList) throws MetaException; /** * Filter given list of partition specs * @param partitionSpecList * @return */ public List filterPartitionSpecs(List partitionSpecList) throws MetaException; /** * filter to given partition object if applicable * @param partition * @return the same partition object if it's not filtered out * @throws NoSuchObjectException */ public Partition filterPartition(Partition partition) throws MetaException, NoSuchObjectException; /** * Filter given list of partition names * @param dbName * @param tblName * @param partitionNames * @return */ public List filterPartitionNames(String dbName, String tblName, List partitionNames) throws MetaException; public Index filterIndex(Index index) throws MetaException, NoSuchObjectException; /** * Filter given list of index names * @param dbName * @param tblName * @param indexList * @return */ public List filterIndexNames(String dbName, String tblName, List indexList) throws MetaException; /** * Filter given list of index objects * @param indexeList * @return */ public List filterIndexes(List indexeList) throws MetaException; }