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package no.nav.common.utils;

import java.util.ArrayList;
import java.util.List;

public class CollectionUtils {

    /**
     * Splitt opp liste i partisjoner av størrelse partitionSize. En liste med 10 elementer og partitionSize 2 vil da se
     * slik ut:
     *
     * [1,2,3,4,5,6,7,8,9] => [[0,1],[2,3],[4,5],[6,7],[8,9]]
     *
     * Merk at siste element vil kunne inneholde færre enn partitionSize elementer.
     */
    public static  List> partition(List list, int partitionSize) {
        List> partitionedList = new ArrayList<>();
        int listSize = list.size();

        for (int i = 0; i < listSize; i = i + partitionSize) {
            int toIndex = i + partitionSize;
            if (toIndex > listSize) {
                toIndex = listSize;
            }
            List sublist = list.subList(i, toIndex);
            partitionedList.add(sublist);
        }
        return partitionedList;
    }

}