Package net.sf.saxon.tree.iter
Interface LookaheadIterator
- All Superinterfaces:
AutoCloseable
,Closeable
,SequenceIterator
- All Known Implementing Classes:
AdjacentTextNodeMergingIterator
,ArrayIterator
,ArrayIterator.Of
,ArrayIterator.OfNodes
,AscendingRangeIterator
,AttributeIterator
,BigRangeIterator
,DescendingRangeIterator
,EmptyIterator
,FocusTrackingIterator
,GroupAdjacentIterator
,GroupBreakingIterator
,GroupByIterator
,GroupEndingIterator
,GroupMatchingIterator
,GroupStartingIterator
,ItemCheckingIterator
,ItemMappingIterator
,ListIterator
,ListIterator.Of
,ListIterator.OfAtomic
,LookaheadIteratorImpl
,ManualGroupIterator
,ManualIterator
,ManualRegexIterator
,MergeGroupingIterator
,MergeIterator
,MultiIndex.SelectedItemsIterator
,MultithreadedFocusTrackingIterator
,MultithreadedItemMappingIterator
,NodeListIterator
,NodeWrappingAxisIterator
,ReportingSingletonIterator
,SingleAtomicIterator
,SingleNodeIterator
,SingletonIterator
,SortedGroupIterator
,SortedIterator
,SubsequenceIterator
,TailIterator
,TwoItemIterator
,UnionEnumeration
,UnionIterator
,UntypedAtomizingIterator
,ValueTailIterator
,ZenoSequence.ZenoSequenceIterator
A SequenceIterator is used to iterate over a sequence. A LookaheadIterator
is one that supports a hasNext() method to determine if there are more nodes
after the current node.
-
Method Summary
Modifier and TypeMethodDescriptionboolean
hasNext()
Determine whether there are more items to come.boolean
Ask whether the hasNext() method can be called.Methods inherited from interface net.sf.saxon.om.SequenceIterator
close, next
-
Method Details
-
supportsHasNext
boolean supportsHasNext()Ask whether the hasNext() method can be called. This method must be called before calling hasNext(), because some iterators implement this interface, but only support look-ahead under particular circumstances (this is usually because they delegate to another iterator)- Returns:
- true if the
hasNext()
method is available
-
hasNext
boolean hasNext()Determine whether there are more items to come. Note that this operation is stateless and it is not necessary (or usual) to call it before calling next(). It is used only when there is an explicit need to tell if we are at the last element.This method must not be called unless the result of
supportsHasNext()
is true.- Returns:
- true if there are more items in the sequence
-