com.icl.saxon.expr

Class LookaheadEnumerator

public class LookaheadEnumerator extends Object implements NodeEnumeration, LastPositionFinder

A LookaheadEnumerator passes the nodes from a base enumerator throgh unchanged. The complication is that on request, it must determine the value of the last() position, which requires a lookahead. A LookaheadEnumerator should only be used to wrap a NodeEnumeration that cannot determine the last() position for itself, i.e. one that is not a LastPositionFinder.

Constructor Summary
	LookaheadEnumerator(NodeEnumeration base) Constructor

Method Summary
int	getLastPosition() Do lookahead to find the last position, if required
boolean	hasMoreElements() Determine whether there are any more nodes to hand to the client
boolean	isPeer() Determine whether the nodes are guaranteed to be peers
boolean	isReverseSorted()
boolean	isSorted() Determine whether the nodes are guaranteed to be in document order
NodeInfo	nextElement() Hand the next node to the client