org.axiondb.functions
Class ComparableAggregateFunction

java.lang.Object
  org.axiondb.BaseSelectable
      org.axiondb.functions.BaseFunction
          org.axiondb.functions.BaseAggregateFunction
              org.axiondb.functions.ComparableAggregateFunction

All Implemented Interfaces:

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

Direct Known Subclasses:

MaxFunction, MinFunction

public abstract class ComparableAggregateFunction
extends BaseAggregateFunction
implements AggregateFunction

Version:

$Revision: 1.1 $ $Date: 2005/08/24 00:41:52 $

See Also:

Serialized Form

Field Summary

Fields inherited from class org.axiondb.BaseSelectable

_hash

Constructor Summary

ComparableAggregateFunction(java.lang.String name)

Method Summary

protected abstract java.lang.Comparable	evaluate(java.lang.Comparable src, java.lang.Comparable val)
java.lang.Object	evaluate(RowDecoratorIterator rows)
DataType	getDataType()

Methods inherited from class org.axiondb.functions.BaseAggregateFunction

acceptable, evaluate, isDistinct, isValid, setDistinct, setDistinct

Methods inherited from class org.axiondb.functions.BaseFunction

addArgument, getArgument, getArgumentCount, 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.ConcreteFunction

isValid

Methods inherited from interface org.axiondb.Function

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

Methods inherited from interface org.axiondb.Selectable

evaluate, getLabel, setVariableContext

Constructor Detail

ComparableAggregateFunction

public ComparableAggregateFunction(java.lang.String name)

Method Detail

getDataType

public final DataType getDataType()

Specified by:

getDataType in interface Selectable

Specified by:

getDataType in class BaseFunction

evaluate

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

Specified by:

evaluate in interface AggregateFunction

Throws:

AxionException

evaluate

protected abstract java.lang.Comparable evaluate(java.lang.Comparable src,
                                                 java.lang.Comparable val)