org.axiondb.functions

Class ArithmeticFunction

java.lang.Object

org.axiondb.BaseSelectable

org.axiondb.functions.BaseFunction

org.axiondb.functions.ArithmeticFunction

All Implemented Interfaces:

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

Direct Known Subclasses:

AddFunction, DivideFunction, MultiplyFunction, SubtractFunction

public abstract class ArithmeticFunction
extends BaseFunction
implements ScalarFunction

Version:

$Revision: 1.9 $ $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
ArithmeticFunction(java.lang.String name)

Method Summary

Modifier and Type	Method and Description
java.lang.Object	evaluate(RowDecorator row)
DataType	getDataType()
boolean	isValid()
protected abstract java.math.BigDecimal	operate(java.math.BigDecimal left, java.math.BigDecimal right)
protected void	setDataType(DataType newType)

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.Function

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

Methods inherited from interface org.axiondb.Selectable

getLabel, setVariableContext

Constructor Detail

ArithmeticFunction

public ArithmeticFunction(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(RowDecorator row)
                                throws AxionException

Specified by:

evaluate in interface ScalarFunction

Specified by:

evaluate in interface Selectable

Throws:

AxionException

isValid

public final boolean isValid()

Specified by:

isValid in interface ConcreteFunction

Specified by:

isValid in class BaseFunction

operate

protected abstract java.math.BigDecimal operate(java.math.BigDecimal left,
                                                java.math.BigDecimal right)
                                         throws AxionException

Throws:

AxionException

setDataType

protected void setDataType(DataType newType)