Example usage for org.apache.spark.api.java Optional of

Introduction

In this page you can find the example usage for org.apache.spark.api.java Optional of.

Prototype

public static <T> Optional<T> of(T value) 

Source Link

Usage

From source file:com.splicemachine.derby.stream.control.ControlPairDataSet.java

License:Apache License

@Override
public <W> PairDataSet<K, Tuple2<V, Optional<W>>> hashLeftOuterJoin(final PairDataSet<K, W> rightDataSet) {
    // Materializes the right side
    final Multimap<K, W> rightSide = multimapFromIterator(((ControlPairDataSet) rightDataSet).source);
    return new ControlPairDataSet(Iterators.concat(Iterators.transform(source,
            new Function<Tuple2<K, V>, Iterable<Tuple2<K, Tuple2<V, Optional<W>>>>>() {
                @Nullable//from ww  w  .  j  av  a  2 s . c o m
                @Override
                public Iterable<Tuple2<K, Tuple2<V, Optional<W>>>> apply(@Nullable Tuple2<K, V> t) {
                    assert t != null : "T cannot be null";
                    List<Tuple2<K, Tuple2<V, Optional<W>>>> result = new ArrayList<>();
                    K key = t._1();
                    V value = t._2();
                    if (rightSide.containsKey(key)) {
                        for (W rightValue : rightSide.get(key)) {
                            result.add(new Tuple2<>(key, new Tuple2<>(value, Optional.of(rightValue))));
                        }
                    } else
                        result.add(new Tuple2<>(key, new Tuple2<>(value, Optional.<W>empty())));
                    return result;
                }
            })));

}

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From source file:com.splicemachine.derby.stream.control.ControlPairDataSet.java

License:Apache License

@Override
public <W> PairDataSet<K, Tuple2<Optional<V>, W>> hashRightOuterJoin(PairDataSet<K, W> rightDataSet) {
    // Materializes the left side
    final Multimap<K, V> leftSide = multimapFromIterator(source);
    return new ControlPairDataSet(Iterators.transform(((ControlPairDataSet<K, W>) rightDataSet).source,
            new Function<Tuple2<K, W>, Iterator<Tuple2<K, Tuple2<Optional<V>, W>>>>() {
                @Nullable//from   w ww .j  ava2  s.c  om
                @Override
                public Iterator<Tuple2<K, Tuple2<Optional<V>, W>>> apply(@Nullable Tuple2<K, W> t) {
                    assert t != null : "t cannot be null!";
                    List<Tuple2<K, Tuple2<Optional<V>, W>>> result = new ArrayList<>();
                    K key = t._1();
                    W value = t._2();
                    if (leftSide.containsKey(key)) {
                        for (V leftValue : leftSide.get(key)) {
                            result.add(new Tuple2<>(key, new Tuple2<>(Optional.of(leftValue), value)));
                        }
                    } else
                        result.add(new Tuple2<>(key, new Tuple2<>(Optional.<V>absent(), value)));
                    return result.iterator();
                }
            }));
}

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