Package com.github.basking2.sdsai.itrex.iterators.splitjoin

Interface UncertainIterator<T>

All Known Implementing Classes:

CloseableUncertainIterator, MappingUncertainIterator, SplitMapUncertainIterator

public interface UncertainIterator<T>

This is a type of iterator that has a "maybe" state as a result to calling hasNext(). The semantic meaning is that, when used in a context of other iterators, that this iterator is not sure if it has more data and other sources should be checked first. If there are no other sources with ready data, then this iterator should be assumed to have no more data. This intentionally does not extend Iterator because this is semantically unique.

Nested Class Summary

Nested Classes

Modifier and Type	Interface	Description
static enum	UncertainIterator.HAS_NEXT

Method Summary

Modifier and Type	Method	Description
UncertainIterator.HAS_NEXT	hasNext()	Return TRUE if elements are ready, FALSE if they are not or MAYBE if we do not know.
T	next()	Get the next value or throw NoSuchElementException.

Method Details

next

T next()

Get the next value or throw NoSuchElementException.

Returns:

The next element.

hasNext

UncertainIterator.HAS_NEXT hasNext()

Return TRUE if elements are ready, FALSE if they are not or MAYBE if we do not know. If no other sources of data are available and the state of the computation system cannot be changed, then MAYBE should be considered FALSE.

Returns:

TRUE if elements are ready, FALSE if they are not or MAYBE if we do not know.