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LastPositionFinder
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net.sf.saxon.expr</FONT>
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Interface LastPositionFinder<T extends <A HREF="../../../../net/sf/saxon/om/Item.html" title="interface in net.sf.saxon.om">Item</A>></H2>
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<DT><B>All Known Implementing Classes:</B> <DD><A HREF="../../../../net/sf/saxon/tree/iter/ArrayIterator.html" title="class in net.sf.saxon.tree.iter">ArrayIterator</A>, <A HREF="../../../../net/sf/saxon/tree/iter/EmptyAxisIterator.html" title="class in net.sf.saxon.tree.iter">EmptyAxisIterator</A>, <A HREF="../../../../net/sf/saxon/tree/iter/EmptyIterator.html" title="class in net.sf.saxon.tree.iter">EmptyIterator</A>, <A HREF="../../../../net/sf/saxon/expr/sort/GroupByIterator.html" title="class in net.sf.saxon.expr.sort">GroupByIterator</A>, <A HREF="../../../../net/sf/saxon/expr/ItemMappingIterator.html" title="class in net.sf.saxon.expr">ItemMappingIterator</A>, <A HREF="../../../../net/sf/saxon/tree/iter/ListIterator.html" title="class in net.sf.saxon.tree.iter">ListIterator</A>, <A HREF="../../../../com/saxonica/stream/ManualIterator.html" title="class in com.saxonica.stream">ManualIterator</A>, <A HREF="../../../../net/sf/saxon/value/MemoClosure.ProgressiveIterator.html" title="class in net.sf.saxon.value">MemoClosure.ProgressiveIterator</A>, <A HREF="../../../../com/saxonica/bytecode/iter/OneToOneMappingIterator.html" title="class in com.saxonica.bytecode.iter">OneToOneMappingIterator</A>, <A HREF="../../../../net/sf/saxon/expr/RangeIterator.html" title="class in net.sf.saxon.expr">RangeIterator</A>, <A HREF="../../../../net/sf/saxon/functions/Remove.RemoveIterator.html" title="class in net.sf.saxon.functions">Remove.RemoveIterator</A>, <A HREF="../../../../net/sf/saxon/tree/iter/ReverseArrayIterator.html" title="class in net.sf.saxon.tree.iter">ReverseArrayIterator</A>, <A HREF="../../../../net/sf/saxon/expr/ReverseRangeIterator.html" title="class in net.sf.saxon.expr">ReverseRangeIterator</A>, <A HREF="../../../../net/sf/saxon/tree/iter/SingleNodeIterator.html" title="class in net.sf.saxon.tree.iter">SingleNodeIterator</A>, <A HREF="../../../../net/sf/saxon/tree/iter/SingletonIterator.html" title="class in net.sf.saxon.tree.iter">SingletonIterator</A>, <A HREF="../../../../net/sf/saxon/expr/sort/SortedGroupIterator.html" title="class in net.sf.saxon.expr.sort">SortedGroupIterator</A>, <A HREF="../../../../net/sf/saxon/expr/sort/SortedIterator.html" title="class in net.sf.saxon.expr.sort">SortedIterator</A>, <A HREF="../../../../net/sf/saxon/expr/SubsequenceIterator.html" title="class in net.sf.saxon.expr">SubsequenceIterator</A>, <A HREF="../../../../net/sf/saxon/expr/TailIterator.html" title="class in net.sf.saxon.expr">TailIterator</A>, <A HREF="../../../../net/sf/saxon/tree/iter/UntypedAtomizingIterator.html" title="class in net.sf.saxon.tree.iter">UntypedAtomizingIterator</A></DD>
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<DT><PRE>public interface <B>LastPositionFinder<T extends <A HREF="../../../../net/sf/saxon/om/Item.html" title="interface in net.sf.saxon.om">Item</A>></B></DL>
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<P>
A LastPositionFinder is an interface implemented by any SequenceIterator that is
able to return the position of the last item in the sequence.
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<CODE> int</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../net/sf/saxon/expr/LastPositionFinder.html#getLength()">getLength</A></B>()</CODE>
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Get the last position (that is, the number of items in the sequence).</TD>
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<A NAME="getLength()"><!-- --></A><H3>
getLength</H3>
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int <B>getLength</B>()
throws <A HREF="../../../../net/sf/saxon/trans/XPathException.html" title="class in net.sf.saxon.trans">XPathException</A></PRE>
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<DD>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 result of getProperties() on the iterator
includes the bit setting <A HREF="../../../../net/sf/saxon/om/SequenceIterator.html#LAST_POSITION_FINDER"><CODE>SequenceIterator.LAST_POSITION_FINDER</CODE></A>
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<DD><DL>
<DT><B>Returns:</B><DD>the number of items in the sequence
<DT><B>Throws:</B>
<DD><CODE><A HREF="../../../../net/sf/saxon/trans/XPathException.html" title="class in net.sf.saxon.trans">XPathException</A></CODE> - if an error occurs evaluating the sequence in order to determine
the number of items</DL>
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