org.apache.openjpa.kernel.exps

Class Null

java.lang.Object

org.apache.openjpa.kernel.exps.Val

org.apache.openjpa.kernel.exps.Null

All Implemented Interfaces:

java.io.Serializable, Value

 class Null
extends Val

Represents the null constant.

Author:

Abe White

Constructor Summary

Constructors

Constructor and Description
Null()

Method Summary

Methods

Modifier and Type	Method and Description
protected java.lang.Object	eval(java.lang.Object candidate, java.lang.Object orig, StoreContext ctx, java.lang.Object[] params) Return this value for the given candidate.
java.lang.Class	getType() Return the expected type for this value, or Object if the type is unknown.
void	setImplicitType(java.lang.Class type) Set the implicit type of the value, based on how it is used in the filter.

Methods inherited from class org.apache.openjpa.kernel.exps.Val

acceptVisit, eval, evaluate, evaluate, getAlias, getMetaData, getName, getPath, getSelectAs, isAggregate, isVariable, isXPath, setAlias, setMetaData

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

Null

Null()

Method Detail

getType

public java.lang.Class getType()

Description copied from interface: Value

Return the expected type for this value, or Object if the type is unknown.

setImplicitType

public void setImplicitType(java.lang.Class type)

Description copied from interface: Value

Set the implicit type of the value, based on how it is used in the filter. This method is only called on values who return Object from Value.getType().

eval

protected java.lang.Object eval(java.lang.Object candidate,
                    java.lang.Object orig,
                    StoreContext ctx,
                    java.lang.Object[] params)

Description copied from class: Val

Return this value for the given candidate.

Specified by:

eval in class Val