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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.HBqlException;
25  import org.apache.hadoop.hbase.hbql.impl.HConnectionImpl;
26  
27  import java.io.IOException;
28  
29  public class DropFamilyAction implements AlterTableAction {
30  
31      private final String familyName;
32  
33      public DropFamilyAction(final String familyName) {
34          this.familyName = familyName;
35      }
36  
37      private String getFamilyName() {
38          return this.familyName;
39      }
40  
41      public void execute(final HConnectionImpl conn,
42                          final HBaseAdmin admin,
43                          final String tableName) throws HBqlException {
44          try {
45              conn.validateFamilyExistsForTable(this.getFamilyName(), tableName);
46              admin.deleteColumn(tableName, this.getFamilyName());
47          }
48          catch (IOException e) {
49              throw new HBqlException(e);
50          }
51      }
52  }