org.axiondb.functions
Class DatePartFunction

java.lang.Object
  org.axiondb.BaseSelectable
      org.axiondb.functions.BaseFunction
          org.axiondb.functions.DatePartFunction

All Implemented Interfaces:

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

public class DatePartFunction
extends BaseFunction
implements ScalarFunction, FunctionFactory

Syntax: DatePart(date-part, date-src) or EXTRACT(date-part FROM date-src)

Version:

$Revision: 1.7 $ $Date: 2005/05/02 22:28:41 $

See Also:

Serialized Form

Field Summary

Fields inherited from class org.axiondb.BaseSelectable

_hash

Constructor Summary

DatePartFunction()
Creates a new instance of Class

Method Summary

java.lang.Object	evaluate(RowDecorator row) Returns String representation of requested portion of given timestamp.
DataType	getDataType() DataType
boolean	isValid()
ConcreteFunction	makeNewInstance()

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

DatePartFunction

public DatePartFunction()

Creates a new instance of Class

Method Detail

makeNewInstance

public ConcreteFunction makeNewInstance()

Specified by:

makeNewInstance in interface FunctionFactory

getDataType

public DataType getDataType()

DataType

Specified by:

getDataType in interface Selectable

Specified by:

getDataType in class BaseFunction

evaluate

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

Returns String representation of requested portion of given timestamp.
Valid parts are {'day', 'month', 'year', 'second', 'millisecond', 'minute', 'hour', 'week', 'quarter'}

Specified by:

evaluate in interface ScalarFunction

Specified by:

evaluate in interface Selectable

Throws:

AxionException

isValid

public boolean isValid()

Specified by:

isValid in interface ConcreteFunction

Specified by:

isValid in class BaseFunction