/**
* 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.dkpro.bigdata.collocations;
import java.io.IOException;
import org.apache.hadoop.mapreduce.Reducer;
;
/** Combiner for pass1 of the CollocationDriver. Combines frequencies for values for the same key */
public class CollocCombiner
extends Reducer<GramKey, Gram, GramKey, Gram>
{
@Override
protected void reduce(GramKey key, Iterable<Gram> values, Context context)
throws IOException, InterruptedException
{
int freq = 0;
Gram value = null;
// accumulate frequencies from values, preserve the last value
// to write to the context.
for (Gram value1 : values) {
value = value1;
freq += value.getFrequency();
}
if (value != null) {
value.setFrequency(freq);
context.write(key, value);
}
}
}