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1   /**
2    * Copyright 2010 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  package org.apache.hadoop.hbase.master.handler;
21  
22  import java.io.IOException;
23  import java.util.List;
24  
25  import org.apache.hadoop.hbase.HColumnDescriptor;
26  import org.apache.hadoop.hbase.HRegionInfo;
27  import org.apache.hadoop.hbase.HTableDescriptor;
28  import org.apache.hadoop.hbase.InvalidFamilyOperationException;
29  import org.apache.hadoop.hbase.Server;
30  import org.apache.hadoop.hbase.master.MasterServices;
31  
32  /**
33   * Handles adding a new family to an existing table.
34   */
35  public class TableAddFamilyHandler extends TableEventHandler {
36  
37    private final HColumnDescriptor familyDesc;
38  
39    public TableAddFamilyHandler(byte[] tableName, HColumnDescriptor familyDesc,
40        Server server, final MasterServices masterServices) throws IOException {
41      super(EventType.C_M_ADD_FAMILY, tableName, server, masterServices);
42      HTableDescriptor htd = getTableDescriptor();
43      if (htd.hasFamily(familyDesc.getName())) {
44        throw new InvalidFamilyOperationException("Family '" +
45          familyDesc.getNameAsString() + "' already exists so cannot be added");
46      }
47      this.familyDesc = familyDesc;
48    }
49  
50    @Override
51    protected void handleTableOperation(List<HRegionInfo> hris)
52    throws IOException {
53      // Update table descriptor
54      this.masterServices.getMasterFileSystem().addColumn(tableName, familyDesc);
55    }
56    @Override
57    public String toString() {
58      String name = "UnknownServerName";
59      if(server != null && server.getServerName() != null) {
60        name = server.getServerName().toString();
61      }
62      String family = "UnknownFamily";
63      if(familyDesc != null) {
64        family = familyDesc.getNameAsString();
65      }
66      return getClass().getSimpleName() + "-" + name + "-" +
67                                getSeqid() + "-" + tableNameStr + "-" + family;
68    }
69  
70  }