org.axiondb.functions
Class AverageFunction

java.lang.Object
  extended byorg.axiondb.BaseSelectable
      extended byorg.axiondb.functions.BaseFunction
          extended byorg.axiondb.functions.AverageFunction
All Implemented Interfaces:
AggregateFunction, ConcreteFunction, Function, FunctionFactory, Selectable, Serializable

public class AverageFunction
extends BaseFunction
implements AggregateFunction, FunctionFactory

Version:
$Revision: 1.3 $ $Date: 2004/09/09 23:47:44 $
See Also:
Serialized Form

Constructor Summary
AverageFunction()
           
 
Method Summary
 Object evaluate(RowDecorator row)
           
 Object evaluate(RowDecoratorIterator rows)
           
 DataType getDataType()
           
 boolean isValid()
           
 ConcreteFunction makeNewInstance()
           
 
Methods inherited from class org.axiondb.functions.BaseFunction
addArgument, getAlias, getArgument, getArgumentCount, getLabel, getName, setAlias, setArgument, setName, setVariableContext, toString
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait
 
Methods inherited from interface org.axiondb.Function
addArgument, getAlias, getArgument, getArgumentCount, getName, setAlias, setArgument
 
Methods inherited from interface org.axiondb.Selectable
getLabel, setVariableContext
 

Constructor Detail

AverageFunction

public AverageFunction()
Method Detail

makeNewInstance

public ConcreteFunction makeNewInstance()
Specified by:
makeNewInstance in interface FunctionFactory

getDataType

public final DataType getDataType()
Specified by:
getDataType in interface Selectable
Specified by:
getDataType in class BaseFunction

evaluate

public final Object evaluate(RowDecorator row)
                      throws AxionException
Specified by:
evaluate in interface Selectable
Throws:
AxionException

evaluate

public final Object evaluate(RowDecoratorIterator rows)
                      throws AxionException
Specified by:
evaluate in interface AggregateFunction
Throws:
AxionException

isValid

public final boolean isValid()
Specified by:
isValid in interface ConcreteFunction
Specified by:
isValid in class BaseFunction