/**
* Returns a single element stream if this projection has a value, otherwise an empty stream.
*
* @return A single element stream if this projection has a value, otherwise an empty stream.
*/
public Stream<B> toStream() {
return isRight() ? Stream.single(value()) : Stream.<B>nil();
}
/**
* Returns a single element stream if this projection has a value, otherwise an empty stream.
*
* @return A single element stream if this projection has a value, otherwise an empty stream.
*/
public Stream<A> toStream() {
return isLeft() ? Stream.single(value()) : Stream.<A>nil();
}