Class FilterEnumerator

java.lang.Object

com.icl.saxon.expr.FilterEnumerator

All Implemented Interfaces:

NodeEnumeration

public class FilterEnumerator
extends Object
implements 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.

Field Summary

Fields

Modifier and Type	Field	Description
(package private) int	max
(package private) int	min

Constructor Summary

Constructors

Constructor	Description
FilterEnumerator(NodeEnumeration base, Expression filter, Context context, boolean finishAfterReject)	Constructor

Method Summary

Modifier and Type	Method	Description
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 Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Details

min

int min

max

int max

Constructor Details

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 predicate

context - The context in which the expression is being evaluated

finishAfterReject - : terminate enumeration on first failure

Throws:

XPathException

Method Details

hasMoreElements

public boolean hasMoreElements()

Test whether there are any more nodes available in the enumeration

Specified by:

hasMoreElements in interface 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

Returns:

the next NodeInfo

Throws:

XPathException

isSorted

public boolean isSorted()

Determine whether the nodes are guaranteed to be in document order

Specified by:

isSorted in interface 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

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