Package net.ontopia.persistence.query.jdo

Class JDONull

java.lang.Object

net.ontopia.persistence.query.jdo.JDONull

All Implemented Interfaces:

JDOValueIF

public class JDONull
extends Object
implements JDOValueIF

INTERNAL: JDOQL value: null. Class used to represent null. Syntax: 'null'.

Field Summary

Fields inherited from interface net.ontopia.persistence.query.jdo.JDOValueIF

COLLECTION, FIELD, FUNCTION, NATIVE_VALUE, NULL, OBJECT, PARAMETER, PRIMITIVE, STRING, VARIABLE

Constructor Summary

Constructors

Constructor	Description
JDONull()

Method Summary

Modifier and Type	Method	Description
boolean	equals(Object obj)
int	getType()	INTERNAL: Returns the type of JDO value indicated by one of the constants in the JDOValueIF interface.
int	hashCode()
String	toString()
void	visit(JDOVisitorIF visitor)	INTERNAL: Allows the value to be visited.

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Constructor Details

JDONull

public JDONull()

Method Details

getType

public int getType()

Description copied from interface: JDOValueIF

INTERNAL: Returns the type of JDO value indicated by one of the constants in the JDOValueIF interface.

Specified by:

getType in interface JDOValueIF

hashCode

public int hashCode()

Overrides:

hashCode in class Object

equals

public boolean equals(Object obj)

Overrides:

equals in class Object

toString

public String toString()

Overrides:

toString in class Object

visit

public void visit(JDOVisitorIF visitor)

Description copied from interface: JDOValueIF

INTERNAL: Allows the value to be visited. This method is used for retrieval of nested data in expressions.

Specified by:

visit in interface JDOValueIF