it.polito.dbdmg.searum.itemsets.sorting.ItemsetSortingReducer.java Source code

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Here is the source code for it.polito.dbdmg.searum.itemsets.sorting.ItemsetSortingReducer.java

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/**
 * Copyright 2014 Luigi Grimaudo (grimaudo.luigi@gmail.com)
 * 
 * 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 it.polito.dbdmg.searum.itemsets.sorting;

import java.io.IOException;

import org.apache.hadoop.io.LongWritable;
import org.apache.hadoop.io.NullWritable;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.mapreduce.Reducer;

/**
 * @author Luigi Grimaudo
 * @version 0.1
 * 
 *          sorting reducer
 * 
 */
public class ItemsetSortingReducer extends Reducer<LongWritable, Text, Text, NullWritable> {

    @Override
    protected void reduce(LongWritable key, Iterable<Text> values, Context context)
            throws IOException, InterruptedException {
        for (Text value : values) {
            context.setStatus("Itemset Sorting Reducer :" + key);
            context.write(value, NullWritable.get());
        }
    }
}