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: Class NodeListExpression

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com.icl.saxon.expr
Class NodeListExpression


java.lang.Object

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  +--com.icl.saxon.expr.Expression

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        +--com.icl.saxon.expr.NodeSetExpression

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              +--com.icl.saxon.expr.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.

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

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

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

containsReferences, evaluateAsNumber, getStaticContext, indent, isContextDocumentNodeSet, make, setStaticContext, usesCurrent

Methods inherited from class java.lang.Object

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

Constructor Detail

NodeListExpression


public NodeListExpression(Expression exp)

Constructor

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

Method Detail

simplify


public Expression simplify()
                    throws XPathException

Simplify the expression

Overrides:: simplify in class Expression

Returns:: the simplified expression

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 class 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 class 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

enumerate


public NodeEnumeration enumerate(Context c,
                                 boolean sort)
                          throws XPathException

Return an enumeration that returns the nodes in document order

Overrides:: enumerate in class NodeSetExpression

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

display


public void display(int level)

Diagnostic print of expression structure

Overrides:: display in class Expression