net.sf.saxon.expr

Class DifferenceEnumeration

Implemented Interfaces:
SequenceIterator

public class DifferenceEnumeration
extends java.lang.Object
implements SequenceIterator

An enumeration representing a nodeset that is teh difference of two other NodeSets. There is an "except" operator in XPath 2.0 to create such an expression.

Fields inherited from interface net.sf.saxon.om.SequenceIterator

GROUNDED, LAST_POSITION_FINDER, LOOKAHEAD

Constructor Summary

DifferenceEnumeration(SequenceIterator p1, SequenceIterator p2, NodeOrderComparer comparer)
Form an enumeration of the difference of two nodesets, that is, the nodes that are in p1 and that are not in p2.

Method Summary

Item
current()
SequenceIterator
getAnother()
int
getProperties()
Get properties of this iterator, as a bit-significant integer.
Item
next()
int
position()

Constructor Details

DifferenceEnumeration

public DifferenceEnumeration(SequenceIterator p1,
                             SequenceIterator p2,
                             NodeOrderComparer comparer)
            throws XPathException
Form an enumeration of the difference of two nodesets, that is, the nodes that are in p1 and that are not in p2.
Parameters:
p1 - the first operand, with nodes delivered in document order
p2 - the second operand, with nodes delivered in document order
comparer - the comparer

Method Details

current

public Item current()
Specified by:
current in interface SequenceIterator

getAnother

public SequenceIterator getAnother()
            throws XPathException
Specified by:
getAnother in interface SequenceIterator

getProperties

public int getProperties()
Get properties of this iterator, as a bit-significant integer.
Specified by:
getProperties in interface SequenceIterator
Returns:
the properties of this iterator. This will be some combination of properties such as SequenceIterator.GROUNDED, SequenceIterator.LAST_POSITION_FINDER, and SequenceIterator.LOOKAHEAD. It is always acceptable to return the value zero, indicating that there are no known special properties. It is acceptable for the properties of the iterator to change depending on its state.

next

public Item next()
            throws XPathException
Specified by:
next in interface SequenceIterator

position

public int position()
Specified by:
position in interface SequenceIterator