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Model serialization problem [message #1776416]

Thu, 16 November 2017 10:02

mind calm

Messages: 35
Registered: July 2017

Member

Hi,

I use xtext + sirius to edit my model.
part of Xtext defined in meta-model as flow:

Requirement returns Requirement:
	'Requirement'
	identifier=EString
	'{'
		('count' count=EInt)?
		('mandatory' mandatory=EBoolean)?
		'type' type=[ApplicationType|EString]
		('applications' '(' applications+=[ApplicationInstance|EString] ( "," applications+=[ApplicationInstance|EString])* ')' )?
	'}';

If i didn't set 'type' of a 'Requirement' in sirius diagram editor, then i can't save the model.

Values: identifier(1), count(0-1), mandatory(0-1)
Semantic Object: CyberPhysicalSystem.requests[0]->Request.requirements[0]->Requirement
URI: platform:/resource/cpsTest/f1.cyberphysicalsystem
Context: Requirement returns Requirement
	at org.eclipse.xtext.serializer.diagnostic.ISerializationDiagnostic$ExceptionThrowingAcceptor.accept(ISerializationDiagnostic.java:131)
	at org.eclipse.xtext.serializer.sequencer.BacktrackingSemanticSequencer.createSequence(BacktrackingSemanticSequencer.java:480)
	at org.eclipse.viatra.examples.cps.model.dsl.serializer.CPSSemanticSequencer.sequence_Requirement(CPSSemanticSequencer.java:200)
	at org.eclipse.viatra.examples.cps.model.dsl.serializer.CPSSemanticSequencer.sequence(CPSSemanticSequencer.java:62)

I think in some scenarios, we should serialize the model successfully, even if there is some unset properties.
Is there any options or switch to ignore the null property in model?

Best regards!

by Keep Mind Calm

[Updated on: Thu, 16 November 2017 10:03]

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Re: Model serialization problem [message #1776418 is a reply to message #1776416]

Thu, 16 November 2017 10:17

Christian Dietrich

Messages: 11907
Registered: July 2009

Senior Member

But the type is required in the grammar ?!?

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Re: Model serialization problem [message #1776648 is a reply to message #1776418]

Mon, 20 November 2017 01:33

mind calm

Messages: 35
Registered: July 2017

Member

Yes, the 'type' is required in the grammar.

Whether we can serialize the model without 'type' or with the 'type' empty?

Best regards!

by Keep Mind Calm

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Re: Model serialization problem [message #1776655 is a reply to message #1776648]

Mon, 20 November 2017 04:41

Christian Dietrich

Messages: 11907
Registered: July 2009

Senior Member

But that model would be broken?

Need professional support for Xtext, Xpand, EMF?
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Re: Model serialization problem [message #1776656 is a reply to message #1776655]

Mon, 20 November 2017 05:38

mind calm

Messages: 35
Registered: July 2017

Member

I don't think model would be broken.
Such as the Requirement grammar mentioned above,

Requirement returns Requirement:
	'Requirement'
	identifier=EString
	'{'
		('count' count=EInt)?
		('mandatory' mandatory=EBoolean)?
		'type' type=[ApplicationType|EString]
		('applications' '(' applications+=[ApplicationInstance|EString] ( "," applications+=[ApplicationInstance|EString])* ')' )?
	'}';

in Sirius editor, if user did not set value of 'type' for a 'Requirement' instance, we can serialize it as blow:

    Requirement "requirement1" {
        count 0
        applications ("***", "***")
    }

there is no 'type' and 'mandatory' information.

Of course, if some property use as identifier, it must have a value.

Best regards!

by Keep Mind Calm

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Re: Model serialization problem [message #1776660 is a reply to message #1776656]

Mon, 20 November 2017 06:14

Christian Dietrich

Messages: 11907
Registered: July 2009

Senior Member

no this model would be invalid.
the grammar says ther has to be a type?

so why dont you simply make it optional in the grammar?

Need professional support for Xtext, Xpand, EMF?
Go to: http://xtext.itemis.com
Twitter : @chrdietrich
Blog : christiandietrich.wordpress.com

[Updated on: Mon, 20 November 2017 06:15]

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Re: Model serialization problem [message #1776666 is a reply to message #1776660]

Mon, 20 November 2017 07:35

mind calm

Messages: 35
Registered: July 2017

Member

Ok, got it, now the only way is to change the grammar. thanks for your reply.

Best regards!

by Keep Mind Calm

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