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AW: [jwt-dev] How to add some code that is run when a property is changed?

Hi Mickael,

 

the ItemProviders are generated from the EMF metamodel. However, it is possible to modify these classes but you need to remove the “@generated” tag from the method or to change it to something like “@generated NOT”  or your changes will be overwritten the next time the model edit code is automatically generated. The problem with this solution is, that changes in the automatically managed code can affect future alterations in the metamodel as possibly more handwritten code has to be manually adapted to the new situation. Another possibility would be to intercept the property change in the editpart of this model element (notifiychanged method), however this only works if the model element is currently displayed in the graphical editor.

 

Regards,

Christian

 

 

Von: jwt-dev-bounces@xxxxxxxxxxx [mailto:jwt-dev-bounces@xxxxxxxxxxx] Im Auftrag von Mickael Istria
Gesendet: Freitag, 20. Juni 2008 14:35
An: Java Workflow Toolbox
Betreff: Re: [jwt-dev] How to add some code that is run when a property is changed?

 

Hello,

After some investigation, I succeded to do what I want.
However, I an not sure whether this change affects EMF metamodel logic (bad) or of the application logic (good)

Instead of a long explication, I'll show you what I changed.
The modified class is org.eclipse.jwt.model.application.provider.WebServiceApplicationItemProvider (part of the model, or part of the application?)
@Override
    public void notifyChanged(Notification notification)
    {
        updateChildren(notification);

        switch (notification.getFeatureID(WebServiceApplication.class))
        {
            case ApplicationPackage.WEB_SERVICE_APPLICATION__INTERFACE:
            case ApplicationPackage.WEB_SERVICE_APPLICATION__OPERATION:
                fireNotifyChanged(new ViewerNotification(notification, notification
                        .getNotifier(), false, true));
                return;
        }
        super.notifyChanged(notification);
    }


was replaced by

@Override
    public void notifyChanged(Notification notification)
    {
        updateChildren(notification);

        switch (notification.getFeatureID(WebServiceApplication.class))
        {
            case ApplicationPackage.WEB_SERVICE_APPLICATION__INTERFACE:
                fireNotifyChanged(new ViewerNotification(notification, notification
                        .getNotifier(), false, true));
                // Should generate a notification instead of hardcode value change
                try {
                    this.setPropertyValue(
                        notification.getNotifier(),
                        PluginProperties.model_feature_name(ApplicationPackage.Literals.APPLICATION__JAVA_CLASS),
                        WSDL2JavaName.getClassName(((WebServiceApplication)notification.getNotifier()).getInterface()));
                } catch (Exception ex) {
                    System.err.println("Could not find class name from WSDL File");
                    ex.printStackTrace();
                }
                return;
            case ApplicationPackage.WEB_SERVICE_APPLICATION__OPERATION:
                fireNotifyChanged(new ViewerNotification(notification, notification
                        .getNotifier(), false, true));
                return;
        }
        super.notifyChanged(notification);
    }

Thanks in advance for your answers!

Mickael

Mickael Istria a √©crit :

Hello,

The title of the mail is maybe clear enough, but I will give you a concrete example of what I wish to do:

I want that when someone set the property "Interface" of the WebServiceApplication (I assumed that this interface is the location of wsdl file, this is just a "proof of concept"), JWT tries to get the Java interface that matches this WSDL, and then set the value of JavaClass property to this result.

However, I did not find how to to this, except by changing the implementation of WebServiceApplication in the metamodel (but this is - in my opinion - a very bad solution to get what I want). I saw a system of notifications, but I did not understood it enough to know if it is the good way.

Do you have any clue about how to implement this (kind of) feature?

Thanks in advance
Mickael
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