/*
* 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.jena.hadoop.rdf.mapreduce;
import java.io.IOException;
import java.util.Iterator;
import org.apache.hadoop.mapreduce.Reducer;
/**
* A reducer that outputs a pair for each value consisting of the value as both the key and value
* @author rvesse
*
* @param <TKey> Key
* @param <TValue> Value
*/
public class ValueReducer<TKey, TValue> extends Reducer<TKey, TValue, TValue, TValue> {
@Override
protected void reduce(TKey key, Iterable<TValue> values, Context context)
throws IOException, InterruptedException {
Iterator<TValue> iter = values.iterator();
while (iter.hasNext()) {
TValue value = iter.next();
context.write(value, value);
}
}
}