com.icl.saxon.expr
Class DifferenceEnumeration
java.lang.Object
com.icl.saxon.expr.DifferenceEnumeration
- NodeEnumeration
public class DifferenceEnumeration
extends java.lang.Object
An enumeration representing a nodeset that is an intersection of two other NodeSets.
There is currently no operator in XPath to create such an expression, but it is used
by the extension function difference(). The code is derived from the analagous UnionEnumeration,
an inner class of UnionExpression.
boolean | hasMoreElements() - Determine whether there are more nodes to come.
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boolean | isPeer() - Determine whether the nodes returned by this enumeration are known to be peers, that is,
no node is a descendant or ancestor of another node.
|
boolean | isReverseSorted() - Determine whether the nodes returned by this enumeration are known to be in
reverse document order.
|
boolean | isSorted() - Determine whether the nodes returned by this enumeration are known to be in document order
|
NodeInfo | nextElement() - Get the next node in sequence.
|
nextNode
(package private) NodeInfo nextNode
DifferenceEnumeration
public DifferenceEnumeration(NodeEnumeration p1,
NodeEnumeration p2,
Controller controller)
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.
p1
- the first operandp2
- the second operand
hasMoreElements
public boolean hasMoreElements()
Determine whether there are more nodes to come.
(Note the term "Element" is used here in the sense of the standard Java Enumeration class,
it has nothing to do with XML elements).
- hasMoreElements in interface NodeEnumeration
- true if there are more nodes
isPeer
public boolean isPeer()
Determine whether the nodes returned by this enumeration are known to be peers, that is,
no node is a descendant or ancestor of another node. This significance of this property is
that if a peer enumeration is applied to each node in a set derived from another peer
enumeration, and if both enumerations are sorted, then the result is also sorted.
- isPeer in interface NodeEnumeration
isReverseSorted
public boolean isReverseSorted()
Determine whether the nodes returned by this enumeration are known to be in
reverse document order.
- isReverseSorted in interface NodeEnumeration
- true if the nodes are guaranteed to be in document order.
isSorted
public boolean isSorted()
Determine whether the nodes returned by this enumeration are known to be in document order
- isSorted in interface NodeEnumeration
- true if the nodes are guaranteed to be in document order.
nextElement
public NodeInfo nextElement()
throws XPathException
Get the next node in sequence.
(Note the term "Element" is used here in the sense of the standard Java Enumeration class,
it has nothing to do with XML elements).
- nextElement in interface NodeEnumeration