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Change behavior without modifying generated code [message #1803311]

Tue, 26 February 2019 16:02

Wilbert Alberts

Messages: 186
Registered: June 2010

Senior Member

Hi,

I would like to modify the behavior of the label provider without changing the generated code.

(The general idea is deescribed here: https://nirmalsasidharan.wordpress.com/2011/05/18/extending-emf-itemproviders-using-google-guice-i/ but then without the guice.)

I thought I could do that by extending the corresponding generated ItemProviders. For my ItemProviders to be used, I also had to extend the generated ItemProviderAdapterFactory. In order for that one to be used I had to modify the plugin.xml of the edit plugin. It registers the generated AdapterFactory and I changed that into MyAdapterFactory.

However, the emf generator generates a new extension each time I changed it into my AdapterFactory.

Is there a way to suppress generation of the extension in the plugin.xml by the emf generator? Or is there a better way to modify the behavior of the label providers without changing any generated code?

Greetings,
Wilbert.

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Re: Change behavior without modifying generated code [message #1803330 is a reply to message #1803311]

Wed, 27 February 2019 01:17

Ed Merks

Messages: 30366
Registered: July 2009

Senior Member

Have you tried changing the marker in the plugin.xml? Also, if you disable Update Classpath in the GenModel, you can maintain the file manually.

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Re: Change behavior without modifying generated code [message #1803342 is a reply to message #1803330]

Wed, 27 February 2019 07:42

Wilbert Alberts

Messages: 186
Registered: June 2010

Senior Member

Hi Ed,

Plugin.xml indeed contains a line like:

      <!-- @generated Ddf -->

Changing that into  results in adding an additional extension. (So then I have two itemProviderAdapterFactories extensions.) As far as I could tell, I could not force the generated editor to prefer mine over the default generated one.

Assuming that the 'update classpath' option is found below 'Templates & Merge' I could not determine any change in behavior. In other words, the plugin .xml gets overwritten regardless whether it is true or false.

Did I trigger some bugs here for which I should file a bug report? FYI, I have been using the windows version of eclipse:

Eclipse Modeling Tools
Version: Photon Release (4.8.0)
Build id: 20180619-1200

with:

EMF Code Generation
Version: 2.13.0.v20180319-0813
Build: 201805310718

Greetings,
Wilbert

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Re: Change behavior without modifying generated code [message #1803365 is a reply to message #1803342]

Wed, 27 February 2019 12:16

Ed Merks

Messages: 30366
Registered: July 2009

Senior Member

I haven't tried it (I'm on vacation) but I believe if you comment out the default generated registration in the plugin.xml (deleting the @generated marker because  can't nest), it will not generate an additional one and you can then register a different one.

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