NodeListExpression (saxon JavaDoc)

Class NodeListExpression

public class NodeListExpression extends NodeSetExpression

A NodeListExpression is an expression denoting a set of nodes sorted in document order.
It is not possible to write a NodeListExpression directly using XPath; however a node set expression is treated as a NodeListExpression when it appears in certain contexts, specifically the select attribute of xsl:apply-templates or xsl:for-each.

Constructor Summary
	NodeListExpression(Expression exp) Constructor

Constructor Summary

NodeListExpression(Expression exp)

Constructor

Method Summary
void	display(int level) Diagnostic print of expression structure
NodeEnumeration	enumerate(Context c, boolean sort) Return an enumeration that returns the nodes in document order
int	getDependencies() Determine which aspects of the context the expression depends on.
Expression	reduce(int dependencies, Context context) Perform a partial evaluation of the expression, by eliminating specified dependencies on the context.
Expression	simplify() Simplify the expression

Method Summary

void

display(int level)

Diagnostic print of expression structure

NodeEnumeration

enumerate(Context c, boolean sort)

Return an enumeration that returns the nodes in document order

int

getDependencies()

Determine which aspects of the context the expression depends on.

Expression

reduce(int dependencies, Context context)

Perform a partial evaluation of the expression, by eliminating specified dependencies on the context.

Expression

simplify()

Simplify the expression

Constructor Detail

NodeListExpression

Constructor

Parameters: exp The expression that delivers the unsorted node-set

Method Detail

display

Diagnostic print of expression structure

enumerate

Return an enumeration that returns the nodes in document order

Parameters: c the evaluation context sort: ignored, this class is used because the enumeration is always in document order

getDependencies

Determine which aspects of the context the expression depends on. The result is a bitwise-or'ed value composed from constants such as Context.VARIABLES and Context.CURRENT_NODE

reduce

Perform a partial evaluation of the expression, by eliminating specified dependencies on the context.

Parameters: dependencies The dependencies to be removed context The context to be used for the partial evaluation

Returns: a new expression that does not have any of the specified dependencies

simplify

Simplify the expression

Returns: the simplified expression