RE: [Springframework-developer] How create Generic DAO pattern in tiger

[Bijl, S. v. d. <sil...@lo...>]

Hi,

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I currently don't have access to the code, but this is wat I recalled.
I'll take a look when I get back home.

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Silvester

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________________________________

From: spr...@li...
[mailto:spr...@li...] On Behalf
Of Achmad Arif Rachim
Sent: woensdag 12 oktober 2005 6:59
To: spr...@li...
Subject: Re: [Springframework-developer] How create Generic DAO pattern
in tiger

=20

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On 10/11/05, Achmad Arif Rachim <a.a...@gm...> wrote:

Hi silvester,

getActualTypeArguments are instance of TypeVariableImpl, and we cannot
cast it into Class. Am I missing something ?

thnx

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On 10/10/05, Bijl, Silvester van der <
sil...@lo...
<mailto:sil...@lo...> > wrote:=20

Hi,

I've been playing around with this. I came up with the following code:


public class AbstractBaseHibernateDao<ObjectType, IdType extends
Serializable> extends
  HibernateDaoSupport implements BaseDao<ObjectType, IdType> {

// JDK 5.0 trickery to retrieve the object class=20
private Class ourClass =3D
(Class)((ParameterizedType)getClass().getGenericSuperclass()).getActualT
ypeArguments()[0];

/*
  * Retrieve object from db.
  */
@SuppressWarnings("unchecked")
public ObjectType get(IdType id) throws DataAccessException {=20
  return (ObjectType) getHibernateTemplate().load(ourClass, id);
}

}

I declared the interface similiar to your code. Hope this helps.

Silvester

________________________________

Van: spr...@li... namens Achmad
Arif Rachim=20
Verzonden: di 11-10-2005 6:33
Aan: spr...@li...;
jug...@ya...
Onderwerp: [Springframework-developer] How create Generic DAO pattern in
tiger=20


How to read Inherit Generic Type class ?

Guys I've been googling all week but couldn't find solution.

Id like to create Generic DAO pattern. So here's what i do

public interface Dao<E extends Entity, I extends Serializable>{=20
    public I create(E entity);
    public E read(I id);
    public void update(E entity);
    public E delete(I id);
}

concrete class would be like this

public class DaoBean implements Dao{
    public Serializable create(Entity entity){
        getHibernateTemplate.save(entity);
        return entity.getId();
    }
    public void update(Entity entity){
        getHibernateTemplate.update(entity);=20
    }
    public Entity read(Serializable id){
        return (Entity)getHibernateTemplate.load(getClass(),id);
    }
    public Entity delete(Serializable id){
        Entity entity =3D read(id);
         getHibernateTemplate.delete(entity);
        return entity;
    }

    public Class getEntityClass(){
        // now ... how to get Dao E class ????
        return E.class;
    }
}

The millon dollar* question is how to get Dao Generic E type class ???=20
(* million asked question)

Thanx


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