org.basex.query.func
Class FNAggr

java.lang.Object
  extended by org.basex.query.ExprInfo
      extended by org.basex.query.expr.Expr
          extended by org.basex.query.expr.Arr
              extended by org.basex.query.func.Fun
                  extended by org.basex.query.func.FNAggr

public final class FNAggr
extends Fun

Aggregating functions.

Author:
Workgroup DBIS, University of Konstanz 2005-10, ISC License, Christian Gruen

Nested Class Summary
 
Nested classes/interfaces inherited from class org.basex.query.expr.Expr
Expr.Use
 
Field Summary
 
Fields inherited from class org.basex.query.func.Fun
func
 
Fields inherited from class org.basex.query.expr.Arr
expr
 
Constructor Summary
FNAggr()
           
 
Method Summary
 Item atomic(QueryContext ctx)
          Evaluates the expression and returns the resulting item or a null reference.
 Expr c(QueryContext ctx)
          Compiles the function.
 
Methods inherited from class org.basex.query.func.Fun
comp, info, init, plan, returned, toString
 
Methods inherited from class org.basex.query.expr.Arr
duplicates, indexEquivalent, removable, remove, uses
 
Methods inherited from class org.basex.query.expr.Expr
addText, checkCtx, checkDbl, checkItr, e, ebv, i, indexAccessible, iter, sameAs, size, test, v
 
Methods inherited from class org.basex.query.ExprInfo
color, name
 
Methods inherited from class java.lang.Object
equals, getClass, hashCode, notify, notifyAll, wait, wait, wait
 

Constructor Detail

FNAggr

public FNAggr()
Method Detail

atomic

public Item atomic(QueryContext ctx)
            throws QueryException
Description copied from class: Expr
Evaluates the expression and returns the resulting item or a null reference. If this method is not overwritten, Expr.iter(org.basex.query.QueryContext) must be implemented.

Overrides:
atomic in class Expr
Parameters:
ctx - query context
Returns:
iterator
Throws:
QueryException - query exception

c

public Expr c(QueryContext ctx)
       throws QueryException
Description copied from class: Fun
Compiles the function.

Overrides:
c in class Fun
Parameters:
ctx - query context
Returns:
evaluated item
Throws:
QueryException - query exception