content: /*
   * 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
   *
   *     https://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.avro.mapred;
  
  import java.io.IOException;
  
  import org.apache.avro.util.Utf8;
  import org.apache.hadoop.conf.Configuration;
  import org.apache.hadoop.fs.FileSystem;
  import org.apache.hadoop.fs.Path;
  import org.apache.hadoop.io.LongWritable;
  import org.apache.hadoop.io.NullWritable;
  import org.apache.hadoop.io.Text;
  import org.apache.hadoop.io.compress.CompressionCodecFactory;
  import org.apache.hadoop.mapred.FileInputFormat;
  import org.apache.hadoop.mapred.FileSplit;
  import org.apache.hadoop.mapred.InputSplit;
  import org.apache.hadoop.mapred.JobConf;
  import org.apache.hadoop.mapred.JobConfigurable;
  import org.apache.hadoop.mapred.LineRecordReader;
  import org.apache.hadoop.mapred.RecordReader;
  import org.apache.hadoop.mapred.Reporter;
  
  /**
   * An {@link org.apache.hadoop.mapred.InputFormat} for text files. Each line is
   * a {@link Utf8} key; values are null.
   */
  public class AvroUtf8InputFormat extends FileInputFormat<AvroWrapper<Utf8>, NullWritable> implements JobConfigurable {
  
    static class Utf8LineRecordReader implements RecordReader<AvroWrapper<Utf8>, NullWritable> {
  
      private LineRecordReader lineRecordReader;
  
      private LongWritable currentKeyHolder = new LongWritable();
      private Text currentValueHolder = new Text();
  
      public Utf8LineRecordReader(Configuration job, FileSplit split) throws IOException {
        this.lineRecordReader = new LineRecordReader(job, split);
      }
  
      @Override
      public void close() throws IOException {
        lineRecordReader.close();
      }
  
      @Override
      public long getPos() throws IOException {
        return lineRecordReader.getPos();
      }
  
      @Override
      public float getProgress() throws IOException {
        return lineRecordReader.getProgress();
      }
  
      @Override
      public boolean next(AvroWrapper<Utf8> key, NullWritable value) throws IOException {
        boolean success = lineRecordReader.next(currentKeyHolder, currentValueHolder);
        if (success) {
          key.datum(new Utf8(currentValueHolder.getBytes()).setByteLength(currentValueHolder.getLength()));
        } else {
          key.datum(null);
        }
        return success;
      }
  
      @Override
      public AvroWrapper<Utf8> createKey() {
        return new AvroWrapper<>(null);
      }
  
      @Override
      public NullWritable createValue() {
        return NullWritable.get();
      }
  
    }
  
    private CompressionCodecFactory compressionCodecs = null;
  
    @Override
    public void configure(JobConf conf) {
      compressionCodecs = new CompressionCodecFactory(conf);
    }
  
    @Override
    protected boolean isSplitable(FileSystem fs, Path file) {
      return compressionCodecs.getCodec(file) == null;
    }
  
    @Override
    public RecordReader<AvroWrapper<Utf8>, NullWritable> getRecordReader(InputSplit split, JobConf job, Reporter reporter)
        throws IOException {
  
      reporter.setStatus(split.toString());
      return new Utf8LineRecordReader(job, (FileSplit) split);
    }
  
  }
  