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What is the language used for the field "Expression" in Edit Image dialog for a stereotype [message #1849348]

Thu, 13 January 2022 12:25

Yoann Farré

Messages: 235
Registered: November 2017

Senior Member

Hello,

I would customize the icon of some elements according to their stereotype. For some of them, I use the Icon field to add some images. It works well when I want to use the same image for every element having the stereotype.

But in some cases, I have a stereotype that can be applied to several kinds of elements (operation, property, etc...). In this case, I would distinguish the elements according to their metatype too. For that, I suppose the field Expression in the Edit Image dialog of a stereotype would be a good location but the only example I found uses a test on an enumeration variable owned by the stereotype ("importance=High"). I would know what is the language to edit the expression. In particular, I would test the metatype of the element with something like : "base_Element.type = Property". Any help to understand how it works is welcome.

Thanks for reading.
Regards.
Yoann.

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Re: What is the language used for the field "Expression" in Edit Image dialog for a stereo [message #1849349 is a reply to message #1849348]

Thu, 13 January 2022 12:46

Yoann Farré

Messages: 235
Registered: November 2017

Senior Member

From what I read in ImageUtil class (used to retrieve this image), this field is only valuable to test an enumeration value. It can not be used to elaborate a more complex boolean expression.

I suppose a workaround would be to store the metatype as an enumeration attribute in the stereotype properties even if it is redundant.

Yoann.

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Re: What is the language used for the field "Expression" in Edit Image dialog for a stereo [message #1849360 is a reply to message #1849349]

Thu, 13 January 2022 16:39

Ansgar Radermacher

Messages: 461
Registered: March 2011
Location: Paris Saclay, France

Senior Member

Hi Yoann,

I've never used the expression attribute. In case of a static profile, there is a pragmatical way I've used a long time ago. Add multiple icons to a stereotype and select one in an added getIcon (to the Impl class of this stereotype), as shown below.

Another way is to use a CSS selecting different shapes depending on a calculated attribute. This has been used for instance in the UCM plugin, see plugin org.eclipse.papyrus.designer.ucm.css

public Image getIcon()
{
	// retieve stereotype ...
	EList<Image> icons = stereotype.getIcons();
	if (...) {
		return icons.get(1);
	}
 	else {
		return icons.get(0);
	}
}

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Re: What is the language used for the field "Expression" in Edit Image dialog for a stereo [message #1849371 is a reply to message #1849360]

Fri, 14 January 2022 12:47

Yoann Farré

Messages: 235
Registered: November 2017

Senior Member

Hi Ansgar,

Thanks for the tip. I use the getIcon way now. I first believed that I had to override a getIcon method but it doesn't exist in the generated class of the stereotype. Then I observe that the code which uses this way looks for a such method in the class and use if it exists. It was not obvious but it works well.
Thank you.
Yoann.

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