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1   /*
2    * Copyright (c) 2011.  The Apache Software Foundation
3    *
4    * Licensed to the Apache Software Foundation (ASF) under one
5    * or more contributor license agreements.  See the NOTICE file
6    * distributed with this work for additional information
7    * regarding copyright ownership.  The ASF licenses this file
8    * to you under the Apache License, Version 2.0 (the
9    * "License"); you may not use this file except in compliance
10   * with the License.  You may obtain a copy of the License at
11   *
12   *     http://www.apache.org/licenses/LICENSE-2.0
13   *
14   * Unless required by applicable law or agreed to in writing, software
15   * distributed under the License is distributed on an "AS IS" BASIS,
16   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
17   * See the License for the specific language governing permissions and
18   * limitations under the License.
19   */
20  
21  package org.apache.hadoop.hbase.hbql.statement;
22  
23  import org.apache.hadoop.hbase.client.HBaseAdmin;
24  import org.apache.hadoop.hbase.hbql.client.ExecutionResults;
25  import org.apache.hadoop.hbase.hbql.client.HBqlException;
26  import org.apache.hadoop.hbase.hbql.impl.HConnectionImpl;
27  
28  import java.util.List;
29  
30  public class AlterTableStatement extends GenericStatement implements ConnectionStatement {
31  
32      private final String                 tableName;
33      private final List<AlterTableAction> alterTableActionList;
34  
35      public AlterTableStatement(final StatementPredicate predicate,
36                                 final String tableName,
37                                 final List<AlterTableAction> alterTableActionList) {
38          super(predicate);
39          this.tableName = tableName;
40          this.alterTableActionList = alterTableActionList;
41      }
42  
43      private String getTableName() {
44          return this.tableName;
45      }
46  
47      protected ExecutionResults execute(final HConnectionImpl conn) throws HBqlException {
48  
49          conn.validateTableDisabled(this.getTableName(), "alter");
50  
51          final HBaseAdmin admin = conn.getHBaseAdmin();
52  
53          for (final AlterTableAction alterTableAction : this.alterTableActionList)
54              alterTableAction.execute(conn, admin, this.getTableName());
55  
56          return new ExecutionResults("Table " + this.getTableName() + " altered.");
57      }
58  
59      public static String usage() {
60          return "ALTER TABLE table_name alter_action_list [IF bool_expr]";
61      }
62  }