org.axiondb.functions
Interface AggregateFunction

All Superinterfaces:

ConcreteFunction, Function, Selectable, java.io.Serializable

All Known Implementing Classes:

AverageFunction, BaseAggregateFunction, ComparableAggregateFunction, CountFunction, MaxFunction, MinFunction, SumFunction

public interface AggregateFunction
extends ConcreteFunction

An aggregate function, which evalutes a collection of Rows.

Version:

$Revision: 1.2 $ $Date: 2002/12/16 23:34:54 $

Method Summary

java.lang.Object

evaluate(RowDecoratorIterator rows)

Methods inherited from interface org.axiondb.functions.ConcreteFunction

isValid

Methods inherited from interface org.axiondb.Function

addArgument, getAlias, getArgument, getArgumentCount, getName, setAlias, setArgument

Methods inherited from interface org.axiondb.Selectable

evaluate, getDataType, getLabel, setVariableContext

Method Detail

evaluate

java.lang.Object evaluate(RowDecoratorIterator rows)
                          throws AxionException

Throws:

AxionException