org.basex.query.xpath.func
Class Random

java.lang.Object
  extended by org.basex.query.ExprInfo
      extended by org.basex.query.xpath.expr.Expr
          extended by org.basex.query.xpath.func.Func
              extended by org.basex.query.xpath.func.Random

public final class Random
extends Func

Constructor for the implementation specific random() function.

Author:
Workgroup DBIS, University of Konstanz 2005-08, ISC License, Christian Gruen

Field Summary
static java.lang.String NAME
          Name of function.
 
Fields inherited from class org.basex.query.xpath.func.Func
desc
 
Constructor Summary
Random(Expr[] arg)
          Function Constructor.
 
Method Summary
 boolean checkArguments()
          Checks validity/number of arguments.
 Item eval(XPContext ctx)
          Evaluates the expression with the specified context set.
 
Methods inherited from class org.basex.query.xpath.func.Func
comp, evalArgs, plan, toString, usesPos, usesSize
 
Methods inherited from class org.basex.query.xpath.expr.Expr
indexEquivalent, indexSizes, returnedValue, sameAs
 
Methods inherited from class org.basex.query.ExprInfo
color, info, name
 
Methods inherited from class java.lang.Object
equals, getClass, hashCode, notify, notifyAll, wait, wait, wait
 

Field Detail

NAME

public static final java.lang.String NAME
Name of function.

Constructor Detail

Random

public Random(Expr[] arg)
Function Constructor.

Parameters:
arg - expression array
Method Detail

eval

public Item eval(XPContext ctx)
          throws QueryException
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:
QueryException - evaluation exception

checkArguments

public boolean checkArguments()
Description copied from class: Func
Checks validity/number of arguments.

Specified by:
checkArguments in class Func
Returns:
result of comparison