: Class FilterEnumerator
com.icl.saxon.expr
Class FilterEnumerator
java.lang.Object
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+--com.icl.saxon.expr.FilterEnumerator
All Implemented Interfaces: NodeEnumeration
public class FilterEnumerator extends java.lang.Objectimplements NodeEnumeration
A FilterEnumerator filters an input NodeEnumeration using a filter expression.
The complication is that on request, it must determine the value of the last() position,
which requires a lookahead.
Method Summary
boolean
hasMoreElements ()
Test whether there are any more nodes available in the enumeration
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 ()
Get the next node if there is one
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
FilterEnumerator
public FilterEnumerator (NodeEnumeration base,
Expression filter,
Context context,
boolean finishAfterReject)
throws XPathException
Constructor
Parameters: base
- A node-set expression denoting the absolute or relative set of nodes from which the
navigation path should start.filter
- The expression defining the filter predicatecontext
- The context in which the expression is being evaluatedfinishAfterReject:
- terminate enumeration on first failure
hasMoreElements
public boolean hasMoreElements ()
Test whether there are any more nodes available in the enumeration
Specified by: hasMoreElements
in interface NodeEnumeration
Following copied from interface: com.icl.saxon.om.NodeEnumeration
Returns: true if there are more nodes
nextElement
public NodeInfo nextElement ()
throws XPathException
Get the next node if there is one
Specified by: nextElement
in interface NodeEnumeration
Following copied from interface: com.icl.saxon.om.NodeEnumeration
Returns: the next NodeInfo
isSorted
public boolean isSorted ()
Determine whether the nodes are guaranteed to be in document order
Specified by: isSorted
in interface NodeEnumeration
Following copied from interface: com.icl.saxon.om.NodeEnumeration
Returns: true if the nodes are guaranteed to be in document order.
isReverseSorted
public boolean isReverseSorted ()
Description copied from interface: NodeEnumeration
Determine whether the nodes returned by this enumeration are known to be in
reverse document order.
Specified by: isReverseSorted
in interface NodeEnumeration
Following copied from interface: com.icl.saxon.om.NodeEnumeration
Returns: true if the nodes are guaranteed to be in document order.
isPeer
public boolean isPeer ()
Determine whether the nodes are guaranteed to be peers
Specified by: isPeer
in interface NodeEnumeration