org.basex.query.func
Class FNAggr

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

public final class FNAggr
extends Fun

Aggregating functions.

Author:

Workgroup DBIS, University of Konstanz 2005-09, 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, 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

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