how to persistent mixin-ed object

wym · **Joined:** Sun Apr 18, 2004 11:20 am **Posts:** 3

hi all,

I use apectwerkz as aop framework to build pure mixin implementation for domain objects.
so that, We have Person.class mixin with Identifiable and HasName Interface/Implement:

Code:

Public class Person {
}

Code:

public interface Identifiable {
   public void setId(Serializable id);
   public Serializable getId();
}

Code:

public class IdentifiableImpl implements Identifiable {

   Serializable _id;
   public void setId(Serializable id) {
      _id = id;
   }
   public Serializable getId() {
      return _id;
   }
}

Code:

public interface HasName {
   public void setName(String name);
   public String getName();
}

Code:

public class HasNameImpl implements HasName {
   String _name;
   public void setName(String name) {
      _name = name;
   }
   public String getName() {
      return _name;
   }
}

Code:

Table Person:
column id String
column name String

when we build the person object use following:

Code:

Person p = new Person();
((Identifiable)p).setId("abc");
((HasName)p).setName("xyz");
....

The question is how to persistent the person object to database via Hibernate?
If it's possible, please give me a hint

Thanks for help!

yiming wang

Code:

max · **Posted:** Sun Apr 18, 2004 2:58 pm

yes - as long as you can somehow provide a name for your mixed-in class.

I don't know much about aspectworkz but I would expect for any decent class-generating framework, to be able to control/assure a consistent naming of the class.

max · **Posted:** Sun Apr 18, 2004 3:03 pm

....and that name you simply put in as the class you want mapped...

wym · **Joined:** Sun Apr 18, 2004 11:20 am **Posts:** 3

max wrote:

....and that name you simply put in as the class you want mapped...

your meaning that i may only create the mapping xml file for that class (person.class), what about the properties mapping to the table's column?
More detail explains are appreciated
thanks!

max · **Posted:** Mon Apr 19, 2004 3:45 pm

As I understand it you are generating a class that are BOTH a Person and Identifiable - something like a IdentifiablePerson ...then you should name your class "IdentifiablePerson" and refer to that in the hbm.xml file..

Code:

<class name="IdentifiablePerson">
...
</class>

wym · **Joined:** Sun Apr 18, 2004 11:20 am **Posts:** 3

I tried it out, but the question from "how to" become "Why can"?
I wrote it down in my weblog, here is the link:

http://www.jroller.com/page/ymwang/20040420#persistent_mixin_object_via_hibernate

and thanks again!

yiming wang