/**
    * 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 org.apache.hadoop.io.LongWritable;
  import org.apache.hadoop.io.Text;
  import org.apache.hadoop.hbase.io.ImmutableBytesWritable;
  import org.apache.hadoop.hbase.util.Base64;
  import org.apache.hadoop.hbase.util.Pair;
  import org.apache.hadoop.mapreduce.Mapper;
  import org.apache.hadoop.mapreduce.Counter;
  import org.apache.hadoop.hbase.classification.InterfaceAudience;
  import org.apache.hadoop.hbase.classification.InterfaceStability;
  import org.apache.hadoop.conf.Configuration;
  
  import java.io.IOException;
  
  /**
   * Write table content out to map output files.
   */
  @InterfaceAudience.Public
  @InterfaceStability.Evolving
  public class TsvImporterTextMapper
  extends Mapper<LongWritable, Text, ImmutableBytesWritable, Text>
  {
  
    /** Column seperator */
    private String separator;
  
    /** Should skip bad lines */
    private boolean skipBadLines;
    private Counter badLineCount;
    private boolean logBadLines;
  
    private ImportTsv.TsvParser parser;
  
    public boolean getSkipBadLines() {
      return skipBadLines;
    }
  
    public Counter getBadLineCount() {
      return badLineCount;
    }
  
    public void incrementBadLineCount(int count) {
      this.badLineCount.increment(count);
    }
  
    /**
     * Handles initializing this class with objects specific to it (i.e., the parser).
     * Common initialization that might be leveraged by a subsclass is done in
     * <code>doSetup</code>. Hence a subclass may choose to override this method
     * and call <code>doSetup</code> as well before handling it's own custom params.
     *
     * @param context
     */
    @Override
    protected void setup(Context context) {
      doSetup(context);
  
      Configuration conf = context.getConfiguration();
  
      parser = new ImportTsv.TsvParser(conf.get(ImportTsv.COLUMNS_CONF_KEY), separator);
      if (parser.getRowKeyColumnIndex() == -1) {
        throw new RuntimeException("No row key column specified");
      }
    }
  
    /**
     * Handles common parameter initialization that a subclass might want to leverage.
     * @param context
     */
    protected void doSetup(Context context) {
      Configuration conf = context.getConfiguration();
  
      // If a custom separator has been used,
      // decode it back from Base64 encoding.
      separator = conf.get(ImportTsv.SEPARATOR_CONF_KEY);
      if (separator == null) {
        separator = ImportTsv.DEFAULT_SEPARATOR;
      } else {
        separator = new String(Base64.decode(separator));
      }
  
     skipBadLines = context.getConfiguration().getBoolean(ImportTsv.SKIP_LINES_CONF_KEY, true);
     logBadLines = context.getConfiguration().getBoolean(ImportTsv.LOG_BAD_LINES_CONF_KEY, false);
     badLineCount = context.getCounter("ImportTsv", "Bad Lines");
   }
 
   /**
    * Convert a line of TSV text into an HBase table row.
    */
   @Override
   public void map(LongWritable offset, Text value, Context context) throws IOException {
     try {
       Pair<Integer,Integer> rowKeyOffests = parser.parseRowKey(value.getBytes(), value.getLength());
       ImmutableBytesWritable rowKey = new ImmutableBytesWritable(
           value.getBytes(), rowKeyOffests.getFirst(), rowKeyOffests.getSecond());
       context.write(rowKey, value);
     } catch (ImportTsv.TsvParser.BadTsvLineException|IllegalArgumentException badLine) {
       if (logBadLines) {
         System.err.println(value);
       }
       System.err.println("Bad line at offset: " + offset.get() + ":\n" + badLine.getMessage());
       if (skipBadLines) {
         incrementBadLineCount(1);
         return;
       } 
       throw new IOException(badLine);
     } catch (InterruptedException e) {
       e.printStackTrace();
       Thread.currentThread().interrupt();
     } 
   }
 }