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slot defining feature [message #539362]

Thu, 10 June 2010 14:34

wafaa

Messages: 163
Registered: January 2010
Location: Egypt

Senior Member

hi all

I want to know how to use the function called
setDefiningFeature (StructuralFeature value);

I mean what are the known information about the value if I want to create it my hand.

it should reference some thing existing but I know its info like
name, owner of it, type and so

how to use them to create new defining feature and set it in the owning slot.

My question might be not logical if it is using editor but through transformation which is my case might be logical

thanks alot
wafaa

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Re: slot defining feature [message #539506 is a reply to message #539362]

Fri, 11 June 2010 06:15

Rafael Chaves

Messages: 161
Registered: July 2009

Senior Member

From the Slot interface:

"StructuralFeature org.eclipse.uml2.uml.Slot.getDefiningFeature()

Returns the value of the 'Defining Feature' reference. The structural feature that specifies the values that may be held by the slot."

Instances can have one or more classifiers. Instances contain slots. Classifiers have structural features. An instance can have one slot for each structural feature (i.e. property) in its classifier(s).

HTH,

Rafael
http://abstratt.com/blog

[Updated on: Fri, 11 June 2010 06:16]

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Re: slot defining feature [message #539736 is a reply to message #539506]

Sat, 12 June 2010 11:53

wafaa

Messages: 163
Registered: January 2010
Location: Egypt

Senior Member

thanks Rafeal for your reply,
I understand your view but I mean, can I create it rather than referencing it or getting it.
I mean can I point to the classifier property (the defining feature of the slot) if I know its information.

as the same way we create property of association when we know for example the ends type.

thanks alot again

Rafael Chaves wrote on Fri, 11 June 2010 09:15

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Re: slot defining feature [message #539765 is a reply to message #539736]

Sat, 12 June 2010 18:25

Rafael Chaves

Messages: 161
Registered: July 2009

Senior Member

I am not sure I understand what you want to do.

You should not create a new structural feature to link from the slot defining feature. What you want to do is to set the defining feature of a slot by retrieving the corresponding *existing* property from one of the classifiers your instance has. For example:

Class myClass = ...;
InstanceSpecification myInstance = ...;
myInstance.getClassifiers().add(myClass);

Slot fooSlot = myInstance.createSlot();
Property fooProperty = myClass.getOwnedAttribute("foo", null);
fooSlot.setDefiningFeature(fooProperty);

To be fair, the fact that UML talks about attributes, properties and structural features when referring to the same thing is not really helpful.

HTH,

Rafael
http://abstratt.com/blog/

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