org.axiondb.functions
Class ComparisonFunction

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

All Implemented Interfaces:

ConcreteFunction, Function, ScalarFunction, Selectable, Serializable

Direct Known Subclasses:

EqualFunction, GreaterThanFunction, GreaterThanOrEqualFunction, LessThanFunction, LessThanOrEqualFunction, NotEqualFunction

public abstract class ComparisonFunction

extends BaseFunction

implements ScalarFunction

Version:

$Revision: 1.5 $ $Date: 2003/08/25 23:41:10 $

See Also:

Serialized Form

Constructor Summary

ComparisonFunction(String name)

Method Summary

protected abstract boolean	compare(int value)
Object	evaluate(RowDecorator row)
ComparisonFunction	flip()
DataType	getDataType()
boolean	isColumnColumn()
boolean	isColumnLiteral()
boolean	isValid()

Methods inherited from class org.axiondb.functions.BaseFunction

addArgument, getAlias, getArgument, getArgumentCount, getLabel, getName, setAlias, setArgument, setName, setVariableContext, toString

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

ComparisonFunction

public ComparisonFunction(String name)

Method Detail

getDataType

public final DataType getDataType()

Specified by:

getDataType in interface Selectable

Specified by:

getDataType in class BaseFunction

isValid

public final boolean isValid()

Specified by:

isValid in interface ConcreteFunction

Specified by:

isValid in class BaseFunction

evaluate

public final Object evaluate(RowDecorator row)
                      throws AxionException

Specified by:

evaluate in interface ScalarFunction

Throws:

AxionException

compare

protected abstract boolean compare(int value)

flip

public ComparisonFunction flip()

isColumnColumn

public boolean isColumnColumn()

isColumnLiteral

public boolean isColumnLiteral()