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The ID of a UML element [message #657583]

Thu, 03 March 2011 11:13

Haffi

Messages: 39
Registered: November 2010

Member

Hi,

Does the UML metamodel provide any way to access the ID of an element? They often look like this in the XML:

<element xmi:type="uml:OpaqueAction" href="SomeModel.uml#_dmKHMDjwEeCH9LLYtylVBA"/>

The ID being the part after the '#'.

I'm trying to access the ID in a QVTo transformation, isn't it the metamodel that provides the methods for accessing data like this, rather than the transformation language itself?

[Updated on: Thu, 03 March 2011 11:16]

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Re: The ID of a UML element [message #657706 is a reply to message #657583]

Thu, 03 March 2011 16:47

Ed Merks

Messages: 26327
Registered: July 2009

Senior Member

Haffi,

eObject.eResource().getURIFragment(eObject) should return the ID.

Haffi wrote:
> Hi,
>
> Does the UML metamodel provide any way to access the ID of an element?
> They often look like this in the XML: <element
> xmi:type="uml:OpaqueAction"
> href="SomeModel.uml#_dmKHMDjwEeCH9LLYtylVBA"/>
>
> I'm trying to access the ID in a QVTo transformation, isn't it the
> metamodel that provides the methods for accessing data like this,
> rather than the transformation language itself?

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Re: The ID of a UML element [message #657817 is a reply to message #657706]

Fri, 04 March 2011 08:44

Rafael Chaves

Messages: 161
Registered: July 2009

Senior Member

I think that may be true for cross resource references only, right?

Doesn't this work for all cases?

((XMIResource) resource).getID(eObject)

Rafael
http://abstratt.com/blog

[Updated on: Fri, 04 March 2011 08:45]

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Re: The ID of a UML element [message #657907 is a reply to message #657817]

Fri, 04 March 2011 14:45

Ed Merks

Messages: 26327
Registered: July 2009

Senior Member

Rafael,

Comments below.

Rafael Chaves wrote:
> I think that may be true for cross resource references only, right?
The code eObject.eResource().getURIFragment(eObject) doesn't even care
whether anything references that object... Note however, that it will
return the ID if there's an ID but will always return a non-null result
such that
eObject.eResource().getEObject(eObject.eResource().getURIFra gment(eObject))
== eObject.
>
> Doesn't this work for all cases?
>
> ((XMIResource) resource).getID(eObject)
This only works in cases where you're contained in an XMIResource. It
will return null if the eObject doesn't have an ID.

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