How to use

org.apache.druid.java.util.common.guava.FunctionalIterable

constructor

public static <T> FunctionalIterable<T> create(Iterable<T> delegate)
{
 return new FunctionalIterable<>(delegate);
}

public <RetType> FunctionalIterable<RetType> transform(Function<T, RetType> fn)
{
 return new FunctionalIterable<>(Iterables.transform(delegate, fn));
}

public FunctionalIterable<T> filter(Predicate<T> pred)
{
 return new FunctionalIterable<>(Iterables.filter(delegate, pred));
}

public <RetType> FunctionalIterable<RetType> transformCat(Function<T, Iterable<RetType>> fn)
{
 return new FunctionalIterable<>(Iterables.concat(Iterables.transform(delegate, fn)));
}

public <RetType> FunctionalIterable<RetType> keep(Function<T, RetType> fn)
{
 return new FunctionalIterable<>(Iterables.filter(Iterables.transform(delegate, fn), Predicates.notNull()));
}

 public <InType1, InType2, RetType> FunctionalIterable<RetType> trinaryTransform(
   final Iterable<InType1> iterable1,
   final Iterable<InType2> iterable2,
   final TrinaryFn<T, InType1, InType2, RetType> trinaryFn
 )
 {
  return new FunctionalIterable<>(TrinaryTransformIterable.create(delegate, iterable1, iterable2, trinaryFn));
 }
}

public FunctionalIterable<T> limit(int limit)
{
 return new FunctionalIterable<>(Iterables.limit(delegate, limit));
}

public FunctionalIterable<T> drop(int numToDrop)
{
 return new FunctionalIterable<>(new DroppingIterable<>(delegate, numToDrop));
}

 private static Sequence<Result<SearchResultValue>> makeReturnResult(
   Segment segment,
   int limit,
   Object2IntRBTreeMap<SearchHit> retVal
 )
 {
  Iterable<SearchHit> source = Iterables.transform(
    retVal.object2IntEntrySet(), new Function<Object2IntMap.Entry<SearchHit>, SearchHit>()
    {
     @Override
     public SearchHit apply(Object2IntMap.Entry<SearchHit> input)
     {
      SearchHit hit = input.getKey();
      return new SearchHit(hit.getDimension(), hit.getValue(), input.getIntValue());
     }
    }
  );

  return Sequences.simple(
    ImmutableList.of(
      new Result<>(
        segment.getDataInterval().getStart(),
        new SearchResultValue(
          Lists.newArrayList(new FunctionalIterable<>(source).limit(limit))
        )
      )
    )
  );
 }
}

public static <T> FunctionalIterable<T> create(Iterable<T> delegate)
{
 return new FunctionalIterable<>(delegate);
}

public FunctionalIterable<T> filter(Predicate<T> pred)
{
 return new FunctionalIterable<>(Iterables.filter(delegate, pred));
}

public <RetType> FunctionalIterable<RetType> transform(Function<T, RetType> fn)
{
 return new FunctionalIterable<>(Iterables.transform(delegate, fn));
}

public <RetType> FunctionalIterable<RetType> transformCat(Function<T, Iterable<RetType>> fn)
{
 return new FunctionalIterable<>(Iterables.concat(Iterables.transform(delegate, fn)));
}

public <RetType> FunctionalIterable<RetType> keep(Function<T, RetType> fn)
{
 return new FunctionalIterable<>(Iterables.filter(Iterables.transform(delegate, fn), Predicates.notNull()));
}

 public <InType1, InType2, RetType> FunctionalIterable<RetType> trinaryTransform(
   final Iterable<InType1> iterable1,
   final Iterable<InType2> iterable2,
   final TrinaryFn<T, InType1, InType2, RetType> trinaryFn
 )
 {
  return new FunctionalIterable<>(TrinaryTransformIterable.create(delegate, iterable1, iterable2, trinaryFn));
 }
}

public FunctionalIterable<T> limit(int limit)
{
 return new FunctionalIterable<>(Iterables.limit(delegate, limit));
}

public FunctionalIterable<T> drop(int numToDrop)
{
 return new FunctionalIterable<>(new DroppingIterable<>(delegate, numToDrop));
}

 private static Sequence<Result<SearchResultValue>> makeReturnResult(
   Segment segment,
   int limit,
   Object2IntRBTreeMap<SearchHit> retVal
 )
 {
  Iterable<SearchHit> source = Iterables.transform(
    retVal.object2IntEntrySet(), new Function<Object2IntMap.Entry<SearchHit>, SearchHit>()
    {
     @Override
     public SearchHit apply(Object2IntMap.Entry<SearchHit> input)
     {
      SearchHit hit = input.getKey();
      return new SearchHit(hit.getDimension(), hit.getValue(), input.getIntValue());
     }
    }
  );

  return Sequences.simple(
    ImmutableList.of(
      new Result<>(
        segment.getDataInterval().getStart(),
        new SearchResultValue(
          Lists.newArrayList(new FunctionalIterable<>(source).limit(limit))
        )
      )
    )
  );
 }
}