newObjectIdInstance(pcClass, obj) - JDO JDOImplHelper's method
Method javax.jdo.spi.JDOImplHelper
Object newObjectIdInstance(
Class pcClass,
Object obj
)
Create a new instance of the class used by the parameter Class for JDO identity, using the key constructor of the object id class. It is intended for single field identity. The identity instance returned has no relationship with the values of the primary key fields of the persistence-capable instance on which the method is called. If the key is the wrong class for the object id class, null is returned.
For classes that use single field identity, if the parameter is of one of the following types, the behavior must be as specified:
NumberorCharacter: the parameter must be the single field type or the wrapper class of the primitive field type; the parameter is passed to the single field identity constructorObjectIdFieldSupplier: the field value is fetched from theObjectIdFieldSupplierand passed to the single field identity constructorString: the String is passed to the single field identity constructor
- Parameters:
-
pcClass- thePersistenceCapableclass. -
obj- theObjectform of the object id
- Returns:
- the new ObjectId instance, or
nullif the class is not registered.
- Since:
- JDO 2.0
