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