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com.icl.saxon.expr

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.

Field Summary

Fields inherited from class com.icl.saxon.expr.Expression

staticContext

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

Methods inherited from class com.icl.saxon.expr.NodeSetExpression

enumerate, evaluate, evaluateAsBoolean, evaluateAsNodeSet, evaluateAsString, getDataType, outputStringValue, selectFirst

Methods inherited from class com.icl.saxon.expr.Expression

containsReferences, display, enumerate, evaluate, evaluateAsBoolean, evaluateAsNodeSet, evaluateAsNumber, evaluateAsString, getDataType, getDependencies, getStaticContext, indent, isContextDocumentNodeSet, make, outputStringValue, reduce, setStaticContext, simplify, usesCurrent

Constructor Details

NodeListExpression

public NodeListExpression(Expression exp)
Constructor

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

Method Details

display

public void display(int level)
Diagnostic print of expression structure
Overrides:
display in interface Expression

enumerate

public NodeEnumeration enumerate(Context c,
                                 boolean sort)
            throws XPathException
Return an enumeration that returns the nodes in document order
Overrides:
enumerate in interface NodeSetExpression

Parameters:
c - the evaluation context

getDependencies

public int 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
Overrides:
getDependencies in interface Expression

reduce

public Expression reduce(int dependencies,
                         Context context)
            throws XPathException
Perform a partial evaluation of the expression, by eliminating specified dependencies on the context.
Overrides:
reduce in interface Expression

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

public Expression simplify()
            throws XPathException
Simplify the expression
Overrides:
simplify in interface Expression

Returns:
the simplified expression

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