LastPositionFinder

All Known Implementing Classes:

ARegexIterator, ArrayIterator, ArrayIterator.Of, ArrayIterator.OfNodes, AscendingRangeIterator, BigRangeIterator, DescendingRangeIterator, EmptyIterator, FocusTrackingIterator, GroupAdjacentIterator, GroupByIterator, GroupByIterator.ManualGroupByIterator, GroupEndingIterator, GroupMatchingIterator, GroupStartingIterator, ItemCheckingIterator, ItemMappingIterator, JRegexIterator, ListIterator, ListIterator.Of, ListIterator.OfAtomic, ManualGroupIterator, ManualIterator, ManualRegexIterator, MemoSequence.ProgressiveIterator, MergeGroupingIterator, MergeGroupingIterator.ManualMergeGroupingIterator, MultiIndex.SelectedItemsIterator, MultithreadedFocusTrackingIterator, MultithreadedItemMappingIterator, NodeListIterator, OneToOneMappingIterator, net.sf.saxon.expr.RangeIterator, Remove.RemoveIterator, Reverse.ReverseListIterator, SingleAtomicIterator, SingleNodeIterator, SingletonIterator, SortedGroupIterator, SortedIterator, SubsequenceIterator, TailIterator, TwoItemIterator, UntypedAtomizingIterator, ZenoSequence.ZenoSequenceIterator
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public interface LastPositionFinder
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A LastPositionFinder is an interface implemented by any SequenceIterator that is able to return the position of the last item in the sequence.

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`int`	`getLength()`	Get the last position (that is, the number of items in the sequence).
`boolean`	`supportsGetLength()`	Ask whether this iterator supports use of the `getLength()` method.

- Method Detail
  - supportsGetLength
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boolean supportsGetLength()
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    Ask whether this iterator supports use of the getLength() method. This method should always be called before calling getLength(), because an iterator that implements this interface may support use of getLength() in some situations and not in others
    
    Returns:
    
    true if the getLength() method can be called to determine the length of the underlying sequence.
  - getLength
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int getLength()
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    Get the last position (that is, the number of items in the sequence). This method is non-destructive: it does not change the state of the iterator. The result is undefined if the next() method of the iterator has already returned null. This method must not be called unless the supportsGetLength() has been called and has returned true.
    
    Returns:
    
    the number of items in the sequence
    
    Throws:
    
    UncheckedXPathException - if an error occurs evaluating the sequence in order to determine the number of items
    
    java.lang.ClassCastException - if the capability is not available. (This exception is not guaranteed.)