JDONull (Ontopia)

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

All Methods Instance Methods Concrete Methods
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 Detail
  - JDONull
```
public JDONull()
```
- Method Detail
  - 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