D-Net

package eu.dnetlib.data.mapreduce.hbase.propagation.communitytoresult;

import com.googlecode.protobuf.format.JsonFormat;

import eu.dnetlib.data.mapreduce.hbase.propagation.Utils;

import eu.dnetlib.data.mapreduce.hbase.propagation.Value;

import eu.dnetlib.data.proto.ResultProtos;

import org.apache.commons.logging.Log;

import org.apache.commons.logging.LogFactory;

import org.apache.hadoop.hbase.io.ImmutableBytesWritable;

import org.apache.hadoop.hbase.util.Bytes;

import org.apache.hadoop.io.Text;

import org.apache.hadoop.mapreduce.Reducer;

import java.io.IOException;

import java.util.Iterator;

public class CommunityToResultFileReducer extends Reducer<ImmutableBytesWritable, Text, Text,Text> {

    private static final Log log = LogFactory.getLog(CommunityToResultFileReducer.class); // NOPMD by marko on 11/24/08 5:02 PM

    private Text keyOut;

    private Text outValue;

    @Override

    protected void setup(final Context context) throws IOException, InterruptedException {

        super.setup(context);

        keyOut = new Text("");

        outValue = new Text();

    }

    @Override

    protected void reduce(ImmutableBytesWritable key, Iterable<Text> values, Context context) throws IOException, InterruptedException {

        Iterator<Text> it = values.iterator();

        final ResultProtos.Result.Metadata.Builder metadata = ResultProtos.Result.Metadata.newBuilder();

        while(it.hasNext()){

            Value v = Value.fromJson(it.next().toString());

            metadata.addContext(Utils.getContext(v.getValue(),v.getTrust()));

        }

        keyOut.set(Bytes.toBytes(key.toString()));

        outValue.set(JsonFormat.printToString(Utils.getUpdate(metadata,key.toString())).getBytes());

        context.write(keyOut, outValue);

    }

}