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ModTransf A Simple Model to Model Transformation Engine

ModTransf A Simple Model to Model Transformation Engine. Cédric Dumoulin. Requirements. Model input: XMI files, ruled by a MOF metamodel XML files, ruled by an XML schema Easy maintenance of transformation rules To follow metamodel changes Code generation from model Simple to use

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ModTransf A Simple Model to Model Transformation Engine

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  1. ModTransfA Simple Model to Model Transformation Engine Cédric Dumoulin

  2. Requirements • Model input: • XMI files, ruled by a MOF metamodel • XML files, ruled by an XML schema • Easy maintenance of transformation rules • To follow metamodel changes • Code generation from model • Simple to use • Yet available

  3. Proposed Solution

  4. MM MM rules rules based on based on instance of instance of transformationengine model model model model Proposed Solution • A transformation engine • takes model(s) and set of rules as input, • and produce model(s)

  5. Vocabulary • Model: • Graph of related Concepts • Concepts defined in metamodel • Metamodel (MM): • Graph of classes defining concepts • Transformation • Specify how concepts from input MM are mapped to concepts of output MM

  6. Basic Principle • “Divide and Conquer” • Express transformation rule by rule • Rule • Specify how one or few input concepts are transformed to one or few output concepts. r1 r2 r3 r4 r5 T input MM output MM

  7. Rule • A rule is made of: • domains • describe input and output concepts • can contain complex conditions • implicitly define enterGuard, exitGuard, concept creations • implicitly define rule parameters • enterGuard • to guard the rule execution • actions • to populate concept, perform code generation, do additional computation, … • exitGuard • to check the result • bind variables • to bind concept and properties to guards and actions

  8. Rule Example 1 (UML)

  9. Rule Example 1(XML)

  10. Rule Example 2 (UML)Nested Concept

  11. Rule Example 2 (XML)

  12. Transformation • A transformation is made of: • involved models declaration • rules • topRule • called by the engine • execute all possible solutions on input domains • rule • called by other rules • selectRule • set of rules called by other rules • the first matching rule is executed

  13. Transformation (UML and XML)

  14. How Transformation is Processed • Called with input and output models • Specify which models are used as target • target models are usually empty • models are bind to transformation model names • TopRules are executed • input domains are those referring to input models • output domains are those referring to output models

  15. How Rules are Processed • Input bind variables are set • Input enter guards are checked • stop if not verified • Output actions are executed • Output objects are created and populated • starting from the more nested one (leafs) • For a concept, property values are computed first, then the object is created and populated. • Output post actions are executed • Output exit guards are checked

  16. Multiple Call of a Rule • Call of a rule with the same set of parameters • Return the same result • Only the first call is executed • Subsequent calls return the first result •  multiple properties referencing the same concept are transformed to references to the same transformed concept

  17. Advanced Features

  18. Extra Properties Definition(ex: stereotypes) • Extra Properties can be defined on model concepts • Usage like regular properties • Only visible in the transformation • Example • definition of the property “stereotypes” • used to check stereotype • defined by the model helper

  19. Extra Properties Usage

  20. Associate code templates to rules Templates contain Replacement places for attributes Nested rule calls Use Velocity templates Code Generation $c1.packageName #foreach( $import in $c1.import ) import $import; #end public class ${c1.name} { // attributes $engine.callRule("attribute“, “src.feature“) // methods $engine. callRule( “method”, “src.method”) }

  21. Code Generation: Example

  22. Documentations

  23. Ongoing effort • Schema • modtransf-v3 • XML syntax

  24. XML Rule Syntax:Schema (transformation)

  25. XML Rule Syntax:Schema (domains)

  26. Access To Models • Throw a common API • Should be implemented for each Technology: • JMI, XML, EMF, Database, …

  27. MOFmetamodel schema JMI JAXB generate generate XMImodel XMLmodel import/export import/export JMI classes Java classes Models Kind • Engine takes graphs of objects as models • Model loading is not part of the engine • Can use JMI, JAXB, Castor, DOM, … • From MOF metamodel: • Use JMI • From XML schema • Use JAXB, Castor

  28. Future features • Aspect like property declaration • enable declaration of extra properties and methods on model concepts • Structure and classes declaration • To create data needed during transformation • dependsOn • Allows specification of rule dependencies • Inheritance • Key declarations • To lookup created concepts by specified properties • …

  29. Questions and Discussion

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