org.axiondb.functions
Class SignFunction

java.lang.Object
  extended by org.axiondb.BaseSelectable
      extended by org.axiondb.functions.BaseFunction
          extended by org.axiondb.functions.SignFunction
All Implemented Interfaces:
Serializable, Function, FunctionFactory, ConcreteFunction, ScalarFunction, Selectable

public class SignFunction
extends BaseFunction
implements ScalarFunction, FunctionFactory

Returns an indicator of the sign of the given double value. If the value is less than zero, -1 is returned. If the value equals zero, 0 is returned. If the value is greater than zero, 1 is returned.

Version:
$Revision: 1.7 $ $Date: 2005/12/20 18:32:28 $
See Also:
Serialized Form

Field Summary
 
Fields inherited from class org.axiondb.BaseSelectable
_hash
 
Constructor Summary
SignFunction()
          Creates a new instance of Class
 
Method Summary
 Object evaluate(RowDecorator row)
           
 DataType getDataType()
          IntegerType
 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

SignFunction

public SignFunction()
Creates a new instance of Class

Method Detail

makeNewInstance

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

getDataType

public DataType getDataType()
IntegerType

Specified by:
getDataType in interface Selectable
Specified by:
getDataType in class BaseFunction

evaluate

public Object evaluate(RowDecorator row)
                throws AxionException
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