001/**
002 * Copyright The Apache Software Foundation
003 *
004 * Licensed to the Apache Software Foundation (ASF) under one or more
005 * contributor license agreements. See the NOTICE file distributed with this
006 * work for additional information regarding copyright ownership. The ASF
007 * licenses this file to you under the Apache License, Version 2.0 (the
008 * "License"); you may not use this file except in compliance with the License.
009 * You may obtain a copy of the License at
010 *
011 * http://www.apache.org/licenses/LICENSE-2.0
012 *
013 * Unless required by applicable law or agreed to in writing, software
014 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
015 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
016 * License for the specific language governing permissions and limitations
017 * under the License.
018 */
019package org.apache.hadoop.hbase.regionserver;
020
021import java.io.IOException;
022
023import org.apache.commons.lang3.NotImplementedException;
024import org.apache.yetus.audience.InterfaceAudience;
025import org.apache.hadoop.hbase.Cell;
026
027/**
028 * A "non-reversed & non-lazy" scanner which does not support backward scanning
029 * and always does a real seek operation. Most scanners are inherited from this
030 * class.
031 */
032@InterfaceAudience.Private
033public abstract class NonReversedNonLazyKeyValueScanner extends
034    NonLazyKeyValueScanner {
035
036  @Override
037  public boolean backwardSeek(Cell key) throws IOException {
038    throw new NotImplementedException("backwardSeek must not be called on a "
039        + "non-reversed scanner");
040  }
041
042  @Override
043  public boolean seekToPreviousRow(Cell key) throws IOException {
044    throw new NotImplementedException("seekToPreviousRow must not be called on a "
045        + "non-reversed scanner");
046  }
047
048  @Override
049  public boolean seekToLastRow() throws IOException {
050    throw new NotImplementedException("seekToLastRow must not be called on a "
051        + "non-reversed scanner");
052  }
053
054}