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This module contains implementations of InputFormat, OutputFormat, Mapper, Reducer, etc which are needed for running MR jobs on tables, WALs, HFiles and other HBase specific constructs. It also contains a bunch of tools: RowCounter, ImportTsv, Import, Export, CompactionTool, ExportSnapshot, WALPlayer, etc

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/*
 * 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.mapreduce;

import java.io.IOException;
import java.util.List;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.hbase.Cell;
import org.apache.hadoop.hbase.KeyValue;
import org.apache.hadoop.hbase.Tag;
import org.apache.hadoop.util.ReflectionUtils;
import org.apache.yetus.audience.InterfaceAudience;

/**
 * Facade to create Cells for HFileOutputFormat. The created Cells are of Put type.
 */
@InterfaceAudience.Public
public class CellCreator {

  public static final String VISIBILITY_EXP_RESOLVER_CLASS =
    "hbase.mapreduce.visibility.expression.resolver.class";

  private VisibilityExpressionResolver visExpResolver;

  public CellCreator(Configuration conf) {
    Class clazz =
      conf.getClass(VISIBILITY_EXP_RESOLVER_CLASS, DefaultVisibilityExpressionResolver.class,
        VisibilityExpressionResolver.class);
    this.visExpResolver = ReflectionUtils.newInstance(clazz, conf);
    this.visExpResolver.init();
  }

  /**
   * @param row       row key
   * @param roffset   row offset
   * @param rlength   row length
   * @param family    family name
   * @param foffset   family offset
   * @param flength   family length
   * @param qualifier column qualifier
   * @param qoffset   qualifier offset
   * @param qlength   qualifier length
   * @param timestamp version timestamp
   * @param value     column value
   * @param voffset   value offset
   * @param vlength   value length
   * @return created Cell
   */
  public Cell create(byte[] row, int roffset, int rlength, byte[] family, int foffset, int flength,
    byte[] qualifier, int qoffset, int qlength, long timestamp, byte[] value, int voffset,
    int vlength) throws IOException {
    return create(row, roffset, rlength, family, foffset, flength, qualifier, qoffset, qlength,
      timestamp, value, voffset, vlength, (List) null);
  }

  /**
   * @param row           row key
   * @param roffset       row offset
   * @param rlength       row length
   * @param family        family name
   * @param foffset       family offset
   * @param flength       family length
   * @param qualifier     column qualifier
   * @param qoffset       qualifier offset
   * @param qlength       qualifier length
   * @param timestamp     version timestamp
   * @param value         column value
   * @param voffset       value offset
   * @param vlength       value length
   * @param visExpression visibility expression to be associated with cell
   * @return created Cell
   * @deprecated since 0.98.9
   * @see HBASE-10560
   */
  @Deprecated
  public Cell create(byte[] row, int roffset, int rlength, byte[] family, int foffset, int flength,
    byte[] qualifier, int qoffset, int qlength, long timestamp, byte[] value, int voffset,
    int vlength, String visExpression) throws IOException {
    List visTags = null;
    if (visExpression != null) {
      visTags = this.visExpResolver.createVisibilityExpTags(visExpression);
    }
    return new KeyValue(row, roffset, rlength, family, foffset, flength, qualifier, qoffset,
      qlength, timestamp, KeyValue.Type.Put, value, voffset, vlength, visTags);
  }

  /**
   * @param row       row key
   * @param roffset   row offset
   * @param rlength   row length
   * @param family    family name
   * @param foffset   family offset
   * @param flength   family length
   * @param qualifier column qualifier
   * @param qoffset   qualifier offset
   * @param qlength   qualifier length
   * @param timestamp version timestamp
   * @param value     column value
   * @param voffset   value offset
   * @param vlength   value length
   * @return created Cell
   */
  public Cell create(byte[] row, int roffset, int rlength, byte[] family, int foffset, int flength,
    byte[] qualifier, int qoffset, int qlength, long timestamp, byte[] value, int voffset,
    int vlength, List tags) throws IOException {
    return new KeyValue(row, roffset, rlength, family, foffset, flength, qualifier, qoffset,
      qlength, timestamp, KeyValue.Type.Put, value, voffset, vlength, tags);
  }

  /** Returns Visibility expression resolver */
  public VisibilityExpressionResolver getVisibilityExpressionResolver() {
    return this.visExpResolver;
  }
}