org.basex.query.xpath.expr
Class Calculation

java.lang.Object
  org.basex.query.xpath.expr.Expr
      org.basex.query.xpath.expr.DualExpr
          org.basex.query.xpath.expr.Calculation

public final class Calculation
extends DualExpr

Calculation Expression.

Author:

Workgroup DBIS, University of Konstanz 2005-07, ISC License, Christian Gruen

Field Summary

Calc	type Expression Type.

Fields inherited from class org.basex.query.xpath.expr.DualExpr

expr1, expr2

Constructor Summary

Calculation(Expr e1, Expr e2, Calc t)
Constructor.

Method Summary

Expr	compile(XPContext ctx) Tries to optimize the Expression.
Num	eval(XPContext ctx) Evaluates the expression with the specified context set.
java.lang.String	toString()

Methods inherited from class org.basex.query.xpath.expr.DualExpr

usesPos, usesSize

Methods inherited from class org.basex.query.xpath.expr.Expr

indexEquivalent, indexSizes, returnedValue, sameAs

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, wait, wait, wait

Field Detail

type

public Calc type

Expression Type.

Constructor Detail

Calculation

public Calculation(Expr e1,
                   Expr e2,
                   Calc t)

Constructor.

Parameters:

e1 - first expression (factor or dividend)

e2 - second expression (factor or divisor)

t - MultiplicativeExpr.MULTIPLICATION / DIVISION / MODULO

Method Detail

compile

public Expr compile(XPContext ctx)
             throws EvalException

Description copied from class: Expr

Tries to optimize the Expression.

Specified by:

compile in class Expr

Parameters:

ctx - expression context

Returns:

optimized Expression

Throws:

EvalException - evaluation exception

eval

public Num eval(XPContext ctx)
         throws EvalException

Description copied from class: Expr

Evaluates the expression with the specified context set. Additionally provides a context

Specified by:

eval in class Expr

Parameters:

ctx - query context

Returns:

resulting XPathValue

Throws:

EvalException - evaluation exception

toString

public java.lang.String toString()

Specified by:

toString in class Expr