javassist has low level apis that allow accessing
elements reflective data, and after that it's same old reflection code,
for example when I treid t make GenericComponents for tapestry
I wanted to make a worker and put generic information into ComponentResources
@Component private EntityEditComponent<Vessel, Long> _vesselEdit;
I found the way to get the declaration for the field from javassist:
I messed a bit with
//ClassTransformation is enhanced to return :
CtField.getFieldInfo2...
FieldInfo info = transformation.getFieldInfo2(fieldName);
SignatureAttribute.ClassType type = (ClassType)
SignatureAttribute.toFieldSignature(sig.getSignature());
System.out.println(fieldName+":TYPE:"+type);//QDEBUG remove
TypeArgument[] typeArguments = type.getTypeArguments();
for (int i = 0; i < typeArguments.length; i++) {
System.out.println("TYPE par:
"+typeArguments[i]);//QDEBUG remove
}
the output is :
_vesselEdit:TYPE:tapestryutil.base.EntityEditComponent<hr.crup.eri.web.entities.Vessel,
java.lang.Long>
TYPE par: hr.crup.eri.web.entities.Vessel
TYPE par: java.lang.Long
after that I just could not get the parameter into ComponentResources
this was all nice but after some digging I found this nice class on jboss
http://viewvc.jboss.org/cgi-bin/viewvc.cgi/jbossretro/trunk/src/main/java/org/jboss/lang/GenericsHelper.java/?revision=227&view=markup&pathrev=227
it has all you need for generics in javassist
Davor Hrg
On Fri, Mar 21, 2008 at 11:21 PM, Howard Lewis Ship <[EMAIL PROTECTED]> wrote:
> Yes ... but that information isn't always exposed properly via the
> Javassist APIs.
>
>
>
> On Fri, Mar 21, 2008 at 3:19 AM, Davor Hrg <[EMAIL PROTECTED]> wrote:
> > Method parameter types contain generic information just like
> > properties and method return types. It is quite similar to stuff
> > in property conduit source.
> >
> > Davor Hrg
> >
> >
> >
> >
> > On Fri, Mar 21, 2008 at 6:41 AM, Howard Lewis Ship <[EMAIL PROTECTED]>
> wrote:
> > > Yes, I think the generics logic isn't smart enough for this case, that
> > > is, to identify and convert the parameter of the event handler method.
> > > You can add this as a bug, but I'm not even sure how to start making
> > > this work correctly!
> > >
> > >
> > >
> > > On Thu, Mar 20, 2008 at 9:04 PM, Angelo Chen <[EMAIL PROTECTED]> wrote:
> > > >
> > > > Hi,
> > > >
> > > > I'm trying out generic in 5.0.11, I have a base class ObjectEdit,
> then
> > > >
> > > > public class ObjectEdit<T> {
> > > >
> > > > private T object;
> > > > public T getObject() { return object;}
> > > > public void setObject(T object) { this.object = object;}
> > > > public void onActivate(T obj) { object = obj;}
> > > > public T onPassivate() { return object; }
> > > > }
> > > >
> > > > I was hoping that I can just extend it like this:
> > > >
> > > > public class UserEdit extends ObjectEdit <Usr> {
> > > > }
> > > >
> > > > but it does not work, error:
> > > > org.apache.tapestry.ioc.internal.util.TapestryException
> > > > Failure reading parameter 'object' of component
> admin/UserEdit:object:
> > > > java.lang.String
> > > >
> > > > I have to do:
> > > >
> > > > public class UserEdit extends ObjectEdit <User> {
> > > > public void onActivate(User obj) {
> > > > this.setObject(obj);
> > > > }
> > > > }
> > > >
> > > > and remove the onActivate from ObjectEdit, why onActivate does not
> work in a
> > > > base class when onPassivate can? Thanks,
> > > >
> > > > A.C.
> > > >
> > > >
> > > > --
> > > > View this message in context:
> http://www.nabble.com/T5%3A-generic%2C-onActivate-and-onPassivate-tp16193600p16193600.html
> > > > Sent from the Tapestry - User mailing list archive at Nabble.com.
> > > >
> > > >
> > > >
> ---------------------------------------------------------------------
> > > > To unsubscribe, e-mail: [EMAIL PROTECTED]
> > > > For additional commands, e-mail: [EMAIL PROTECTED]
> > > >
> > > >
> > >
> > >
> > >
> > > --
> > > Howard M. Lewis Ship
> > >
> > > Creator Apache Tapestry and Apache HiveMind
> > >
> > >
> > >
> > > ---------------------------------------------------------------------
> > > To unsubscribe, e-mail: [EMAIL PROTECTED]
> > > For additional commands, e-mail: [EMAIL PROTECTED]
> > >
> > >
> >
> > ---------------------------------------------------------------------
> > To unsubscribe, e-mail: [EMAIL PROTECTED]
> > For additional commands, e-mail: [EMAIL PROTECTED]
> >
> >
>
>
>
> --
> Howard M. Lewis Ship
>
> Creator Apache Tapestry and Apache HiveMind
>
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