I am creating an Eclipse plugin for a custom task extension, as is done here:
Everything works fine, but I cannot figure out how to set input / output parameters by default.
E.g. to set the name of the task I simply do:
serviceTask.setName("Do Something");
I would like to provide default input / output parameters too. I can see that there is a method
serviceTask.setIoSpecification(arg0);
But I cannot figure out how to use it.
Thankful for any pointers in the right direction.
Hi @VictorEkdahl,
What do you mean with “input / output parameters”? Do you mean the camunda:inputOutput element (see 1)? Or do you mean the bpmn InputOutputSpecification element?
Cheers,
Roman
Hello @roman.smirnov
I mean the camunda:inputOutput element in the service task Input/Output tab. That is, the input and output parameters of the task.
If InputOutputSpecification is something else entirely, perhaps the Input/Output can be set similarly to the class value? I.e.
EStructuralFeature InputOutput = ModelPackage.eINSTANCE.getDocumentRoot_InputOutput()
I did make an attempt along those lines without success. Because what would the X in
serviceTask.eSet(InputOutput, X)
be?
Perhaps, this isn’t the right approach either?
Hi @VictorEkdahl,
The camunda:InputOutput element is a custom camunda extension elements. That’s why you can’t use serviceTask.eSet(InputOutput, X) to set it. The camunda:InputOutput element must be added as an extension element of the service task.
In order to add a custom element to the extension elements of a service task you can use the ExtensionUtil#addExtension() (see 1).
Does it help you?
Cheers,
Roman
It’s all new to me, so no, not yet, but I’ll keep looking at it. I think I got the general idea.
addExtension(EObject object, EStructuralFeature feature, EObject value)
Speculations:
What is the “value” though?
Thanks,
Victor
The value would be an instance of the camunda extension element InputOutput, so it would the X in your example above.
Cheers,
Roman
Yes, but X is unknown to me.
How do I create an extension element InputOutput object that I can pass to the above, is what the question now boils down to.
Anyway, I’ve seen your name in the source code and I appreciate the help so far. I understand that it’s trivial to you.
Hi @VictorEkdahl,
An instance of InputOutput can be created by using the ModelFactory:
ModelFactory.eINSTANCE.createInputOutputType()
Cheers,
Roman
Hm, ok.
So to summarize so far, I do:
final InputOutputType InputOutput = ModelFactory.eINSTANCE.createInputOutputType();
ExtensionUtil.addExtension(serviceTask, PluginConstants.INPUT_OUTPUT_FEATURE, InputOutput);
Where
EStructuralFeature INPUT_OUTPUT_FEATURE = ModelPackage.eINSTANCE.getDocumentRoot_InputOutput();
and the rest is as in the custom task tutorial.
This compiles and does not give an error, but the input-output table is empty. So I create a parameter:
final ParameterType parameter = ModelFactory.eINSTANCE.createParameterType();
field.setName("input name");
field.setText("input value");
And here I get stuck again - what do I do next to associate this parameter with the input or output list of the InputOutput object?
Again, it’s a custom extension element i.e. “camunda:inputParameter”. So I attempt to use the ExtensionUtil again, but this time I don’t know on what object to put it.
Any hints appreciated.
To add an input/output parameter you have to do the following:
EStructuralFeature inputFeature = ModelPackage.eINSTANCE.getInputOutputType_InputParameters();
EList<ParameterType> inputs = (EList<ParameterType>) inputOutput.eGet(inputFeature);
ParameterType inputParameter = ModelFactory.eINSTANCE.createParameterType();
inputs.add(inputParameter);
The same for output paremters
EStructuralFeature outputFeature = ModelPackage.eINSTANCE.getInputOutputType_OutputParameters();
EList<ParameterType> outputs = (EList<ParameterType>) inputOutput.eGet(inputFeature);
ParameterType outputParameter = ModelFactory.eINSTANCE.createParameterType();
outputs.add(outputParameter);
Does it help you?
Cheers,
Roman
Yes, it does!
It’s working now. Thank you.