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java.lang.Object | +--com.icl.saxon.expr.LookaheadEnumerator
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()
Determine whether the nodes returned by this enumeration are known to be in reverse document order. |
boolean |
isSorted()
Determine whether the nodes are guaranteed to be in document order |
NodeInfo |
nextElement()
Hand the next node to the client |
| Methods inherited from class java.lang.Object |
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
| Constructor Detail |
public LookaheadEnumerator(NodeEnumeration base)
base - An NodeEnumerator that delivers the nodes, but that cannot determine the
last position count.| Method Detail |
public boolean hasMoreElements()
hasMoreElements in interface NodeEnumerationcom.icl.saxon.om.NodeEnumeration
public NodeInfo nextElement()
throws XPathException
nextElement in interface NodeEnumerationcom.icl.saxon.om.NodeEnumeration
public int getLastPosition()
throws XPathException
getLastPosition in interface LastPositionFinderpublic boolean isSorted()
isSorted in interface NodeEnumerationcom.icl.saxon.om.NodeEnumerationpublic boolean isReverseSorted()
NodeEnumerationisReverseSorted in interface NodeEnumerationcom.icl.saxon.om.NodeEnumerationpublic boolean isPeer()
isPeer in interface NodeEnumeration
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