Package com.icl.saxon.expr

Class ArithmeticExpression

java.lang.Object

com.icl.saxon.expr.Expression

com.icl.saxon.expr.BinaryExpression

com.icl.saxon.expr.ArithmeticExpression

class ArithmeticExpression
extends BinaryExpression

Arithmetic Expression: a numeric expression consisting of the sum, difference, product, quotient, or modulus of two numeric expressions

Field Summary

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

operator, p1, p2

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

staticContext

Constructor Summary

Constructors

Constructor	Description
ArithmeticExpression()
ArithmeticExpression(Expression p1, int operator, Expression p2)

Method Summary

Modifier and Type	Method	Description
Value	evaluate(Context c)	Evaluate an expression.
double	evaluateAsNumber(Context c)	Evaluate an expression as a Number.
int	getDataType()	Determine the data type of the expression, if possible
Expression	reduce(int dependencies, Context context)	Perform a partial evaluation of the expression, by eliminating specified dependencies on the context.

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

display, getDependencies, setDetails, simplify

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

containsReferences, enumerate, evaluateAsBoolean, evaluateAsNodeSet, evaluateAsString, getStaticContext, indent, isContextDocumentNodeSet, make, outputStringValue, setStaticContext, usesCurrent

Methods inherited from class java.lang.Object

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

Constructor Detail

ArithmeticExpression

public ArithmeticExpression()

ArithmeticExpression

public ArithmeticExpression(Expression p1,
                            int operator,
                            Expression p2)

Method Detail

evaluate

public Value evaluate(Context c)
               throws XPathException

Evaluate an expression.

Specified by:

evaluate in class Expression

Parameters:

context - The context in which the expression is to be evaluated

Returns:

the value of the expression as a Value object, evaluated in the current context

Throws:

XPathException

evaluateAsNumber

public double evaluateAsNumber(Context c)
                        throws XPathException

Evaluate an expression as a Number.

Overrides:

evaluateAsNumber in class Expression

Parameters:

context - The context in which the expression is to be evaluated

Returns:

the value of the expression as a double, evaluated in the current context

Throws:

XPathException

getDataType

public int getDataType()

Determine the data type of the expression, if possible

Specified by:

getDataType in class Expression

Returns:

Value.NUMBER

reduce

public Expression reduce(int dependencies,
                         Context context)
                  throws XPathException

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

Specified by:

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

Throws:

XPathException