Accessing interfaces in JPA

Question

Hi!
I have some JPA Entities that are part of various separate persisted class hierarchies. I want to be able to have just some of them be referenced from another entity, namely those that implement a specific interface. It's not hard to see how it could be done at the database level, where I can have the referencing entity hold an id column and a discriminator column. However, I see no way to annotate which object should be created from which discriminator value when the class hierarchies are separate and persisted with joined inheritance.
Here is a simplified example:
@Entity
@Table(name="ValueSeriesConfig")
@Inheritance(strategy = InheritanceType.JOINED)
public class ValueSeriesConfig {
  @Id
  protected long id;
@Entity
@Table(name="CalculationConfig")
public class CalculationConfig extends ValueSeriesConfig implements EventGenerator {
@Entity
@Table(name="ReadingSeriesConfig")
public class ReadingSeriesConfig extends ValueSeriesConfig {
@Entity
@Table(name = "Schedule")
public class Schedule implements EventGenerator {
@Entity
@Table(name = "AlarmConfig")
public class AlarmConfig {
  @Id
  long id;
  @ManyToOne
  @JoinColumn(name="TriggerId") /** This is not enough... */
  EventGenerator triggeredBy;
}In this code, the AlarmConfig.triggeredBy field can reference some of the classes in the ValueSeriesConfig hierarchy and the Schedule class, since they implement EventGenerator. Is it possible to use JPA annotations to link this up correctly? Is there something akin to Tuplizers I can insert to decode it?
Thanks in advance,
-Lars Clausen

Answer 1

any idea how to do this in AIR 2?  Looking at the documentation, I see that you can run executable files using the NativeProcess class, so I guess could execute something like "cscript filename.js" and then "filename.js" could contain WScript methods.  But does anyone know of a way I can take advantage of COM interfaces more directly using AIR 2?