org.apache.mahout.fpm.pfpgrowth.dataset.KeyBasedStringTupleCombiner.java Source code

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Here is the source code for org.apache.mahout.fpm.pfpgrowth.dataset.KeyBasedStringTupleCombiner.java

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/*
 * 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.apache.mahout.fpm.pfpgrowth.dataset;

import java.io.IOException;
import java.util.Set;

import com.google.common.collect.Sets;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.mapreduce.Reducer;
import org.apache.mahout.common.StringTuple;

public class KeyBasedStringTupleCombiner extends Reducer<Text, StringTuple, Text, StringTuple> {

    @Override
    protected void reduce(Text key, Iterable<StringTuple> values, Context context)
            throws IOException, InterruptedException {
        Set<String> outputValues = Sets.newHashSet();
        for (StringTuple value : values) {
            outputValues.addAll(value.getEntries());
        }
        context.write(key, new StringTuple(outputValues));
    }
}