org.basex.query.xpath.func
Class Not

java.lang.Object
  org.basex.query.xpath.expr.Expr
      org.basex.query.xpath.func.Func
          org.basex.query.xpath.func.Not

public final class Not
extends Func

Constructor for not() function.

Author:

Workgroup DBIS, University of Konstanz 2005-07, ISC License, Tim Petrowsky

Field Summary

Fields inherited from class org.basex.query.xpath.func.Func

desc

Constructor Summary

Not(Expr[] arg)
Function Constructor.

Method Summary

boolean	checkArguments() Checks validity/number of arguments.
Expr	compile(XPContext ctx) Tries to optimize the Expression.
Bool	eval(XPContext ctx) Evaluates the expression with the specified context set.

Methods inherited from class org.basex.query.xpath.func.Func

evalArgs, toString, 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

Constructor Detail

Not

public Not(Expr[] arg)

Function Constructor.

Parameters:

arg - expression array

Method Detail

checkArguments

public boolean checkArguments()

Description copied from class: Func

Checks validity/number of arguments.

Specified by:

checkArguments in class Func

Returns:

result of comparison

compile

public Expr compile(XPContext ctx)
             throws EvalException

Description copied from class: Expr

Tries to optimize the Expression.

Overrides:

compile in class Func

Parameters:

ctx - expression context

Returns:

optimized Expression

Throws:

EvalException - evaluation exception

eval

public Bool 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