1 /**
2 * Copyright The Apache Software Foundation
3 *
4 * Licensed to the Apache Software Foundation (ASF) under one or more
5 * contributor license agreements. See the NOTICE file distributed with this
6 * work for additional information regarding copyright ownership. The ASF
7 * licenses this file to you under the Apache License, Version 2.0 (the
8 * "License"); you may not use this file except in compliance with the License.
9 * You may obtain a copy of the License at
10 *
11 * http://www.apache.org/licenses/LICENSE-2.0
12 *
13 * Unless required by applicable law or agreed to in writing, software
14 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
15 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
16 * License for the specific language governing permissions and limitations
17 * under the License.
18 */
19 package org.apache.hadoop.hbase.regionserver;
20
21 import java.io.IOException;
22
23 import org.apache.commons.lang.NotImplementedException;
24 import org.apache.hadoop.hbase.classification.InterfaceAudience;
25 import org.apache.hadoop.hbase.Cell;
26
27 /**
28 * A "non-reversed & non-lazy" scanner which does not support backward scanning
29 * and always does a real seek operation. Most scanners are inherited from this
30 * class.
31 */
32 @InterfaceAudience.Private
33 public abstract class NonReversedNonLazyKeyValueScanner extends
34 NonLazyKeyValueScanner {
35
36 @Override
37 public boolean backwardSeek(Cell key) throws IOException {
38 throw new NotImplementedException("backwardSeek must not be called on a "
39 + "non-reversed scanner");
40 }
41
42 @Override
43 public boolean seekToPreviousRow(Cell key) throws IOException {
44 throw new NotImplementedException("seekToPreviousRow must not be called on a "
45 + "non-reversed scanner");
46 }
47
48 @Override
49 public boolean seekToLastRow() throws IOException {
50 throw new NotImplementedException("seekToLastRow must not be called on a "
51 + "non-reversed scanner");
52 }
53
54 }