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.index;
22
23 import org.apache.hadoop.hbase.client.tableindexed.IndexSpecification;
24 import org.apache.hadoop.hbase.client.tableindexed.SimpleIndexKeyGenerator;
25 import org.apache.hadoop.hbase.hbql.client.HBqlException;
26 import org.apache.hadoop.hbase.hbql.client.Util;
27
28 import java.util.List;
29
30 public class SingleColumnIndex extends IndexSpecification {
31
32
33 private SingleColumnIndex(final String indexName,
34 final byte[][] indexedColumns,
35 final byte[][] additionalColumns) {
36 super(indexName, indexedColumns, additionalColumns, new SimpleIndexKeyGenerator(indexedColumns[0]));
37 }
38
39 public static SingleColumnIndex newIndex(final String indexName,
40 final List<String> indexList,
41 final List<String> includeList) throws HBqlException {
42
43 if (indexList.size() != 1)
44 throw new HBqlException("Invalid index " + indexName + ". Only single column indexes allowed.");
45
46 return new SingleColumnIndex(indexName,
47 Util.getStringsAsBytes(indexList),
48 Util.getStringsAsBytes(includeList));
49 }
50 }