com.novell.xml.xpath
Class UnionExpr

java.lang.Object
  com.novell.xml.xpath.BinaryExpr
      com.novell.xml.xpath.UnionExpr

All Implemented Interfaces:

Expression

public class UnionExpr

extends BinaryExpr

implements Expression

This class implements the XPath UnionExpr functionality. The UnionExpr takes two operands of type node-set and returns the set union of the operands.

Field Summary

Fields inherited from class com.novell.xml.xpath.BinaryExpr

lhs, rhs

Constructor Summary

UnionExpr(Expression lhs, Expression rhs)
Construct an expression implementing the XPath UnionExpr functionality.

Method Summary

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.
String	toString() Provide a readable description for debugging.

Methods inherited from class com.novell.xml.xpath.BinaryExpr

dump, isConstant, registerForReset

Methods inherited from class java.lang.Object

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

Methods inherited from interface com.novell.xml.xpath.Expression

dump, isConstant, registerForReset

Constructor Detail

UnionExpr

public UnionExpr(Expression lhs,
                 Expression rhs)

Construct an expression implementing the XPath UnionExpr functionality. Both operands must result in type of node-set.

Parameters:

lhs - The left node-set operand

rhs - The right node-set 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

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.