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RDF Turtle code generation template [message #1783257]

Fri, 09 March 2018 17:51

Dennis Melzer

Messages: 48
Registered: December 2014

Member

Hello community,

I usually use fully integrated modeling solutions like EMF or xtext to generate code.

In a project, the meta-model and the model instance is declared in RDF (https://www.w3.org/TR/turtle/) turtle).

Example
Meta-Model

@prefix foo:<http://a#> .
@prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> .

foo:Bar a rdfs:Class .

The model instance looks like:

@prefix foo:<http://a#> .

foo:MyBar a foo:Bar .

I would generate the following code. The meta-model classes (rdfs:Class) can be written manually.

I would generate java code like:

public class MyBar extends Bar

Is it possible to combine the turtle meta-models with a template language (xpand, xtend, JET etc.) together with mwe2 to generate java code? Unfortunately, I'm missing a starting point, how to implement something like this.

Cheers

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Re: RDF Turtle code generation template [message #1783268 is a reply to message #1783257]

Sat, 10 March 2018 06:57

Ed Merks

Messages: 33137
Registered: July 2009

Senior Member

Of course you'd need some technology/library to read RDF into a Java representation, but yes, from there you could use a template language such as Xtend to generate something textual from it. Alternatively you might map/transform the RDF representation to Ecore and reuse what Ecore generates; that's how XSD is supported, for example.

Ed Merks
Professional Support: https://www.macromodeling.com/

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Re: RDF Turtle code generation template [message #1783363 is a reply to message #1783268]

Mon, 12 March 2018 12:11

Dennis Melzer

Messages: 48
Registered: December 2014

Member

Thanks for the answer.

Alternatively, I considered using xcore. But I'm not sure if xcore is the right technology to define my own meta-model.
So you can build on this metamodel instances with another xcore model

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Re: RDF Turtle code generation template [message #1783370 is a reply to message #1783363]

Mon, 12 March 2018 12:48

Ed Willink

Messages: 7655
Registered: July 2009

Senior Member

Hi

Xcore is probably right for you, but the Eclipse Modeling tools offer many compatible options:

If you prefer a tree editor, traditional Ecore using the Sample Ecore Editor will do.

If you prefer a diagram editor, the Ecore Diagram Editor is what you want

If you want to define behaviour using OCL, then use OCLinEcore

If you want UML diagrams then use Papyrus

Regards

Ed Willink

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Re: RDF Turtle code generation template [message #1783400 is a reply to message #1783370]

Mon, 12 March 2018 15:32

Dennis Melzer

Messages: 48
Registered: December 2014

Member

I'm currently evaluating xcore with eson. Looks very good. Unfortunately, I can not find a example for constraints and own types.

On the subject of EMF:

The model should be understandable even if no Eclipse Tooling is available, so EMF with XMI is rather unsuitable.
I am not sure if a tree structure is sufficient for the meta-model

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Re: RDF Turtle code generation template [message #1783405 is a reply to message #1783400]

Mon, 12 March 2018 16:37

Ed Willink

Messages: 7655
Registered: July 2009

Senior Member

Hi

No model tooling is a mad constraint. You might as well insist that your Word documents are readable as hex dumps or that your Java programs can be executed without a Java compiler.

Regards

Ed Willink

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Re: RDF Turtle code generation template [message #1783591 is a reply to message #1783268]

Wed, 14 March 2018 12:49

Dennis Melzer

Messages: 48
Registered: December 2014

Member

Ed Merks wrote on Sat, 10 March 2018 06:57

Of course you'd need some technology/library to read RDF into a Java representation, but yes, from there you could use a template language such as Xtend to generate something textual from it.

Do you already know existing templates in Xtend to generate Pojos? Or helper classes for upper case the first letter for getter/setter etc.

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Re: RDF Turtle code generation template [message #1783595 is a reply to message #1783591]

Wed, 14 March 2018 13:23

Ed Willink

Messages: 7655
Registered: July 2009

Senior Member

Hi

I suspect that the Java you want is very similar to that produced by EMF's genmodel, so I would strongly recommend that you try to exploit it. If you need to abandon it then the many utils may still be helpful for cap-name etc.

If you really want trivial Java then generating it is so trivial that you should just do it. Anyone else's templates are liable to have the wrong emphasis.

If you want non-trivial Java, I recommend that you find a good Java model and code a to-Java-model M2M so that you can re-use the Java-model to Java-text that accompanies the good Java model. If you find this please let me know so that I can use it in my next rewrite of the OCL-to-intermediate-to-Java code generator. My best guess is that Modisco might provide something good.

Regards

Ed Willink

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Re: RDF Turtle code generation template [message #1783600 is a reply to message #1783595]

Wed, 14 March 2018 13:56

Dennis Melzer

Messages: 48
Registered: December 2014

Member

Ed Willink wrote on Wed, 14 March 2018 13:23

Hi

I suspect that the Java you want is very similar to that produced by EMF's genmodel, so I would strongly recommend that you try to exploit it. If you need to abandon it then the many utils may still be helpful for cap-name etc.

Yes correct, just something in the way of the EMF models, where can I find the JET templates?

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Re: RDF Turtle code generation template [message #1783607 is a reply to message #1783600]

Wed, 14 March 2018 14:52

Ed Willink

Messages: 7655
Registered: July 2009

Senior Member

Hi

The JET templates are in the codegen plugin, but I would very strongly recommend that you do not edit them. Investigate the many configuration options that EMF already provides.

Regards

Ed Willink

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