org.axiondb.functions

Class BaseAggregateFunction

java.lang.Object

org.axiondb.BaseSelectable

org.axiondb.functions.BaseFunction

org.axiondb.functions.BaseAggregateFunction

All Implemented Interfaces:

java.io.Serializable, Function, AggregateFunction, ConcreteFunction, Selectable

Direct Known Subclasses:

AverageFunction, ComparableAggregateFunction, CountFunction, SumFunction

public abstract class BaseAggregateFunction
extends BaseFunction
implements AggregateFunction

Version:

$Revision: 1.4 $ $Date: 2005/12/20 18:32:28 $

See Also:

Serialized Form

Field Summary

Fields inherited from class org.axiondb.BaseSelectable

_hash

Constructor Summary

Constructors

Constructor and Description
BaseAggregateFunction(java.lang.String name)

Method Summary

Modifier and Type	Method and Description
protected boolean	acceptable(java.lang.Object val)
java.lang.Object	evaluate(RowDecorator row)
protected boolean	isDistinct()
boolean	isValid()
protected void	setDistinct()
protected void	setDistinct(boolean distinct)

Methods inherited from class org.axiondb.functions.BaseFunction

addArgument, getArgument, getArgumentCount, getDataType, setArgument, setVariableContext, toString

Methods inherited from class org.axiondb.BaseSelectable

getAlias, getLabel, getName, setAlias, setName

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Methods inherited from interface org.axiondb.functions.AggregateFunction

evaluate

Methods inherited from interface org.axiondb.Function

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

Methods inherited from interface org.axiondb.Selectable

getDataType, getLabel, setVariableContext

Constructor Detail

BaseAggregateFunction

public BaseAggregateFunction(java.lang.String name)

Method Detail

evaluate

public final java.lang.Object evaluate(RowDecorator row)
                                throws AxionException

Specified by:

evaluate in interface Selectable

Throws:

AxionException

acceptable

protected boolean acceptable(java.lang.Object val)
                      throws AxionException

Throws:

AxionException

setDistinct

protected void setDistinct()
                    throws AxionException

Throws:

AxionException

setDistinct

protected void setDistinct(boolean distinct)
                    throws AxionException

Throws:

AxionException

isDistinct

protected boolean isDistinct()

isValid

public final boolean isValid()

Specified by:

isValid in interface ConcreteFunction

Specified by:

isValid in class BaseFunction