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Java example source code file (FoldBetweenPartitionFunction.java)

This example Java source code file (FoldBetweenPartitionFunction.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

arraylist, broadcast, counter, exception, foldbetweenpartitionfunction, function2, iterator, list, override, util

The FoldBetweenPartitionFunction.java Java example source code

package org.deeplearning4j.spark.text.functions;

import org.apache.spark.api.java.function.Function2;
import org.apache.spark.broadcast.Broadcast;
import org.deeplearning4j.berkeley.Counter;

import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import java.util.concurrent.atomic.AtomicLong;

/**
 * @author jeffreytang
 */
public class FoldBetweenPartitionFunction implements Function2<Integer, Iterator>{
    private Broadcast<Counter broadcastedMaxPerPartitionCounter;

    public FoldBetweenPartitionFunction(Broadcast<Counter broadcastedMaxPerPartitionCounter) {
        this.broadcastedMaxPerPartitionCounter = broadcastedMaxPerPartitionCounter;
    }

    @Override
    public Iterator<Long> call(Integer ind, Iterator partition) throws Exception {
        int sumToAdd = 0;
        Counter<Integer> maxPerPartitionCounterInScope = broadcastedMaxPerPartitionCounter.value();

        // Add the sum of counts of all the partition with an index lower than the current one
        if (ind != 0) {
            for (int i=0; i < ind; i++) { sumToAdd += maxPerPartitionCounterInScope.getCount(i); }
        }

        // Add the sum of counts to each element of the partition
        List<Long> itemsAddedToList = new ArrayList<>();
        while (partition.hasNext()) {
            itemsAddedToList.add(partition.next().get() + sumToAdd);
        }

        return itemsAddedToList.iterator();
    }
}

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