Using autoclassed concrete classes, and pyjnius is complaining that my interface?? objects have no attribute (which are methods on the concrete class)

[coderextreme]

Sample project is here https://github.com/coderextreme/pythonSAI. I think I may need to use more than autoclass

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[coderextreme]

Traceback (most recent call last): File "abox.py", line 60, in ProtoInstance29.setIS(IS30) AttributeError: 'org.web3d.x3d.sai.Core.ProtoInstance' object has no attribute 'setIS'

and similar

[JPDSousa]

Any update on this front? I'm having the same issue 😢

[coderextreme]

I’m guessing it’s related to the getSuperclass call in pyjnius (in the autoclass function I think).

Make sure you are enforcing your interface contracts. Do not return a concrete class, but rather return the interface (or make the types returned match).

John

Sent from Mail for Windows 10

From: João Sousa Sent: Tuesday, April 23, 2019 10:05 AM To: kivy/pyjnius Cc: John Carlson; Author Subject: Re: [kivy/pyjnius] Using autoclassed concrete classes, and pyjnius iscomplaining that my interface?? objects have no attribute (which are methodson the concrete class) (#270)

Any update on this front? I'm having the same issue 😢 — You are receiving this because you authored the thread. Reply to this email directly, view it on GitHub, or mute the thread.

[JPDSousa]

I caught this issue while doing a getClass over an interface object

[coderextreme]

I don’t think there’s such a thing as an interface object??? I know what you mean though.

On Wed, Apr 24, 2019 at 1:24 PM João Sousa [email protected] wrote:

I caught this issue while doing a getClass over an interface object

— You are receiving this because you authored the thread. Reply to this email directly, view it on GitHub https://github.com/kivy/pyjnius/issues/270#issuecomment-486370305, or mute the thread https://github.com/notifications/unsubscribe-auth/AAFMJ56DIQB3TVU552LDDBLPSCQWTANCNFSM4DKKXREQ .

[JPDSousa]

What I mean is that I have a given class that returns an interface type and for some reason I cannot do a getClass over that result object, as it throws a no attribute error. The strange thing is that find_javaclass.isInstance does not work as well, as it always returns false, even when I load the interface type.

[coderextreme]

Yeah, you’ll have to dig into pyjnius I guess, if you don’t want to change your code. You can call a similar method with a different signature in your implementing class, which returns an instance of a concrete class which inherits from the interface, but does not declare the similar method in the interface. GL What I am doing is implementing primitive type wrappers around my parameters, so that the concrete class method is selected instead of the interface method. It’s like you’re ignoring the interface though.

I do not like it. If your implementing class does return an interface type just like the interface does, I suggest that the super class is overriding the subclass and blocking the implementation, but I haven’t proved anything satisfactorily yet. I need to start up a debugger, but not sure which one to use with kivy.

Basically, my “boss” is overly optimistic, and I am pessimistic because I am just a newb at Python. We need help from the pyjnius experts!

Another solution is not to use return values. YMMV

John

Sent from Mail for Windows 10

From: João Sousa Sent: Wednesday, April 24, 2019 3:55 PM To: kivy/pyjnius Cc: John Carlson; Author Subject: Re: [kivy/pyjnius] Using autoclassed concrete classes, and pyjnius iscomplaining that my interface?? objects have no attribute (which are methodson the concrete class) (#270)

What I mean is that I have a given class that returns an interface type and for some reason I cannot do a getClass over that method, as it throws a no attribute error. The strange thing is that find_javaclass.isInstance does not work as well, as it always returns false, even when I load the interface type. — You are receiving this because you authored the thread. Reply to this email directly, view it on GitHub, or mute the thread.

[carlsonsolutiondesign]

Also complains on abstract classes in addition to interfaces

[github-actions[bot]]

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