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Use External Java Action in Create Instance [message #1775788]

Mon, 06 November 2017 12:29

Bo Liu

Messages: 32
Registered: July 2016

Member

Hello Community,

Is it possible to call an external Java Action unter Create Instance.
I want to set some value to the newly created Instance programmatically using an external java action.

How can I access the created instance in the java action?

Thanks in advance.

[Updated on: Mon, 06 November 2017 12:30]

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Re: Use External Java Action in Create Instance [message #1775858 is a reply to message #1775788]

Tue, 07 November 2017 10:34

Pierre-Charles David

Messages: 522
Registered: July 2009

Senior Member

Hi,

If you mean External Java Actions as described in https://www.eclipse.org/sirius/doc/specifier/general/Model_Operations.html#external_java_action, the current element ("self") on which the action is invoked is available in the first argument of your Java class's execute() method. If you defined your action as a child of the "Create Instance" operation, the current element for the operation will be the newly created instance.

Note that External Java Actions are an older mechanism which should probably be deprecated at some point. Plain Java services are much more flexible. In your case, you could simply use a "Set" operation, with the "Value Expression" returning the value you want for the element's feature. The value expression can be as simple as a plain AQL expression, and can also invoke Java code if needed (see https://www.eclipse.org/sirius/doc/specifier/general/Writing_Queries.html#service_methods).

Regards,

Pierre-Charles David - Obeo

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