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Arrows should mean dependency and not navigation association Papyrus [message #1806170]

Sat, 04 May 2019 13:17

Eclipse User

When you want to represent an association in papyrus you must include the arrow to indicate navigation. If not by default is considered as no navigation between classes, and the code is generated according to this.

Id like that papyrus could change this behaviour: when you write the association between two classes, you should write a line without arrows to indicate association. When you want to mean dependency, you can add an arrow in one direction ( dependency is uni-directional) association.

Sorry for my bad english, but here you can take a look about my opinion:
https://en.wikipedia.org/wiki/Class_diagram
the asssociation is normally represented as a line

Also the arrow should mean dependency ( uni-directional association)

For example in this relation :
index.php/fa/35467/0/

You have to enable the navigation direction both sides from bed to floor and floor to bed.... by default other software and uml that arrows should not appear...

For example in visual paradigm:

index.php/fa/35468/0/

So i vote to use the visual paradigm way, and if not at least set it as an option...

Thanks in advance

Attachment: Anotación 2019-05-04 191121.jpg
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Attachment: Anotación 2019-05-04 191318.jpg
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[Updated on: Sat, 04 May 2019 13:21] by Moderator

Re: Arrows should mean dependency and not navigation association Papyrus [message #1806184 is a reply to message #1806170]

Sun, 05 May 2019 08:08

Eclipse User

Hi,

I'm fairly certain that this association presentation conforms to the notation options prescribed by the UML specification. But in any case, you may be able to customize it using the diagram's CSS styling capability:

https://help.eclipse.org/2019-03/topic/org.eclipse.papyrus.infra.gmfdiag.css.doc/target/generated-eclipse-help/css.html?cp=75_1_2_5_1#Style_properties

Look for the 'targetDecoration' and 'sourceDecoration' properties. All of the supported values for these properties don't seem to be enumerated here; you may have to look in the source code to find the rest.

HTH,

Christian

Re: Arrows should mean dependency and not navigation association Papyrus [message #1806191 is a reply to message #1806184]

Sun, 05 May 2019 14:29

Eclipse User

Hi,

as the figure 11.29 and 11.30 of the UML 2.5.1 specification (https://www.omg.org/spec/UML/2.5.1/PDF) shows, the arrows might be omitted if the association is navigable in both directions.

As a result both notations are allowed by the UML specification.

By the way, Visual Paradigm can also show the arrows as shown in the diagram attached.

One more detail:
The bullets in front of the arrows of the association shown as the Papyrus example by Eduardo denotes both ends of the association are owned by the classes associated.
In the Visual Paradigm example given the association ends are owned by the association itself.

Best regards,
Carsten

Attachment: Class Diagram1.svg
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[Updated on: Sun, 05 May 2019 14:35] by Moderator

Re: Arrows should mean dependency and not navigation association Papyrus [message #1806210 is a reply to message #1806170]

Mon, 06 May 2019 05:06

Eclipse User

But could be confusing the use of arrows showing both navigation and dependency.... Most of the tutorials and the wiki post above shows that arrows are omitted in bi-directional associations.

Thanks

Re: Arrows should mean dependency and not navigation association Papyrus [message #1806218 is a reply to message #1806210]

Mon, 06 May 2019 05:56

Eclipse User

The graphical notation of a dependency as specified by the UML 2.5.1 specification (chapter 7.7) is a dashed line. Associations as mentioned before are represented by solid lines. Consequently associations and dependencies could be distinguished by their respective line style.

Carsten

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