hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/NonReversedNonLazyKeyValueScanner.java

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.hadoop.hbase.regionserver;

import java.io.IOException;
import org.apache.commons.lang3.NotImplementedException;
import org.apache.hadoop.hbase.ExtendedCell;
import org.apache.yetus.audience.InterfaceAudience;

/**
 * A "non-reversed & non-lazy" scanner which does not support backward scanning and always does
 * a real seek operation. Most scanners are inherited from this class.
 */
@InterfaceAudience.Private
public abstract class NonReversedNonLazyKeyValueScanner extends NonLazyKeyValueScanner {

  @Override
  public boolean backwardSeek(ExtendedCell key) throws IOException {
    throw new NotImplementedException(
      "backwardSeek must not be called on a " + "non-reversed scanner");
  }

  @Override
  public boolean seekToPreviousRow(ExtendedCell key) throws IOException {
    throw new NotImplementedException(
      "seekToPreviousRow must not be called on a " + "non-reversed scanner");
  }

  @Override
  public boolean seekToLastRow() throws IOException {
    throw new NotImplementedException(
      "seekToLastRow must not be called on a " + "non-reversed scanner");
  }

}