com.novell.xml.xpath
Class UnaryExpr

java.lang.Object
  com.novell.xml.xpath.UnaryExpr

All Implemented Interfaces:

Expression

public class UnaryExpr

extends Object

implements Expression

This class implements the XPath 'UnaryExpr' functionality. The evaluation causes the lhs and rhs expressions to be evaluated and the results added as numbers. The result is of type NumberValue

Constructor Summary

UnaryExpr(Expression operand)
Construct an addition AdditiveExpr expression

Method Summary

void	dump(PrintWriter writer, int indent) Print the expression in a readable form for debugging.
ExpressionValue	evaluate(Node contextNode, ExpressionContext context) Evaluate the expression with repect to the passed context
Class	getResultType() Return the Class object describing the result type of the expression.
boolean	isConstant() Return true if the expression is a constant value.
void	registerForReset(XPathResetRegistrar registrar) Register this expression or any subexpression that implements XPathResetCache with an object that wants to call resetCache()
String	toString() Provide a readable description for debugging.

Methods inherited from class java.lang.Object

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

Constructor Detail

UnaryExpr

public UnaryExpr(Expression operand)

Construct an addition AdditiveExpr expression

Parameters:

operand - the expression operand

Method Detail

toString

public String toString()

Provide a readable description for debugging.

Returns:

String representation

evaluate

public ExpressionValue evaluate(Node contextNode,
                                ExpressionContext context)
                         throws XPathEvaluationException

Evaluate the expression with repect to the passed context

Specified by:

evaluate in interface Expression

Parameters:

contextNode - context node for expression evaluation

context - expression context for expression evaluation

Returns:

result of evaluating expression

Throws:

XPathEvaluationException

isConstant

public boolean isConstant()

Return true if the expression is a constant value.

Specified by:

isConstant in interface Expression

Returns:

True is expression is constant, false otherwise.

dump

public void dump(PrintWriter writer,
                 int indent)

Print the expression in a readable form for debugging.

Specified by:

dump in interface Expression

Parameters:

writer - The output device.

indent - Number of tabs to indent the result.

getResultType

public Class getResultType()

Return the Class object describing the result type of the expression.

Specified by:

getResultType in interface Expression

Returns:

A Class object.

registerForReset

public void registerForReset(XPathResetRegistrar registrar)

Register this expression or any subexpression that implements XPathResetCache with an object that wants to call resetCache()

Specified by:

registerForReset in interface Expression