io.github.repir.MapReduceTools.NullInputSplit Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of RepIR Show documentation

The newest version!

package io.github.repir.MapReduceTools;

import io.github.repir.Repository.Repository;
import io.github.repir.tools.io.buffer.BufferDelayedWriter;
import io.github.repir.tools.io.buffer.BufferReaderWriter;
import io.github.repir.tools.lib.Log;
import org.apache.hadoop.io.NullWritable;

/**
 * A custom implementation of Hadoop's InputSplit used by RetrieverMR. 
 * Each Split holds a set of Queries tasks that must all belong to the same partition. 
 * 
 * @author jeroen
 */
public class NullInputSplit extends MRInputSplit {

   public static Log log = new Log(NullInputSplit.class);

   public NullInputSplit() {
   }

   public NullInputSplit(Repository repository, int partition) {
      super(repository, partition);
   }

   @Override
   public NullWritable convert(Integer p) {
      return NullWritable.get();
   }

   @Override
   public void writeKey(BufferDelayedWriter out, Integer key) {
   }

   @Override
   public Integer readKey(BufferReaderWriter reader) {
      return null;
   }
}