org.axiondb.functions
Class ConcatFunction

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

All Implemented Interfaces:

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

public class ConcatFunction
extends BaseFunction
implements ScalarFunction, FunctionFactory

CONCAT(string [, string]*): concatenates one or more strings.

Evaluates to NULL if any of the arguments are null.

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

ConcatFunction()

Method Summary

java.lang.Object	evaluate(RowDecorator row)
DataType	getDataType() StringType
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

ConcatFunction

public ConcatFunction()

Method Detail

makeNewInstance

public ConcreteFunction makeNewInstance()

Specified by:

makeNewInstance in interface FunctionFactory

getDataType

public DataType getDataType()

StringType

Specified by:

getDataType in interface Selectable

Specified by:

getDataType in class BaseFunction

evaluate

public java.lang.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