Query/View/Transformation Operational Mapping Language in Java

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Query/View/Transformation Operational Mapping Language
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The Meta-Object Facility (MOF) Query/View/Transformation (QVT) specification includes three languages: the Relations language, the Core language, and the Operational Mapping Language (OML) The first two are related, in that the Relations language is transformed into the Core language for execution The Relations language is a highlevel, declarative language that is intended to be more user-friendly than low-level, imperative languages It can support complex pattern matching between objects, creating a trace file implicitly that allows for bidirectional transformation
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The Core language is semantically equivalent to the Relations language but is defined at a lower level of abstraction Therefore, transformations written in Core are more verbose than those written in Relations Trace models must be defined explicitly, unlike in Relations, where they are derived from the transformation definition Both the Relations language and OML are currently under development within the Model-to-Model Transformation (M2M) project At the time of this writing, only the OML is available, so it is the focus of this book Note also that this book focuses on aspects of OML that have an implementation available, but it also discusses some aspects of the language that are planned to be supported in the future The OML is intended to provide an imperative alternative, which can be invoked from the Relations and Core languages in a black-box manner OML makes extensive use of Object Constraint Language (OCL), which this book does not cover in detail As with Eclipse Modeling Framework (EMF), OCL is covered by a book of its own, which is recommended reading before, or in parallel
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CHAPTER 13 Query/View/Transformation Operational Mapping Language
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with, this book This chapter covers the extensions to OCL added in the QVT spec OML is an imperative language that most programmers will find familiar The language is used to define unidirectional transformations, although a second transformation can always be written to provide bidirectionality It can provide implementations of mappings for the Core or Relations languages when declarative approaches prove difficult, which is known as a hybrid approach Transformations defined exclusively using OML are known as operational mappings As you will see in the language description that follows and throughout the examples in this book, you can write equivalent QVT scripts in many ways The decisions made by the transformation author to use particular techniques and constructs will be determined by experience, style preference, reusability, and maintainability factors As the language and tooling support matures, features for navigation, refactoring, and optimization of QVT scripts are expected to improve the experience of working with QVT from its current state
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131 Transformation Declaration
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A QVT transformation is defined in a file that includes a transformation signature and main mapping to serve as an entry point One or more modeltype declarations can also be included to explicitly define the metamodels used in the transformation Following is a transformation declaration with modeltype and main mapping elements:
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modeltype UML uses simpleuml('http://wwweclipseorg/examples/100/simpleuml'); modeltype RDB uses rdb('http://wwweclipseorg/examples/100/rdb'); transformation uml2rdb(in uml:UML, out rdb:RDB) { -- The main entry point of the transformation main() { -- Standard model element access and mapping invocation umlobjects()[Class]->map class2table(); } }
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As you can see, a transformation definition is much like a class declaration, with import statements, a signature, and a main() mapping entry point The analogy between operational QVT and object-oriented languages is accurate: Transformations are instantiated and have properties and (mapping) operations Note that the mappings of the transformation are enclosed within curly braces following the transformation signature This is not required if the file has only
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131 Transformation Declaration
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one transformation, in which case the transformation declaration is terminated by a semicolon At the time of this writing, QVT Operational (QVTO) currently supports only one transformation per file, so the previous syntax would result in a compiler error Instead, declare transformations as follows:
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transformation uml2rdb(in uml:UML, out rdb:RDB);
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Each model parameter is associated with an MOF extent The transformation itself can be considered a class that is instantiated, causing the initialization of the parameter extents Output parameters are initialized to empty model extents All are accessible using the this variable, which refers to the transformation instance itself When instantiating objects, the model extent can be declared to remove ambiguity when multiple models of the same type are in use This is done using the @ sign followed by the name, as shown here:
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transformation mindmap2requirements(in inModel : mindmap, out oneModel : requirements, out outModel2 : requirements); main() { object Model@oneModel { } }
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The modeltype declaration assigns an alias to a metamodel used in the context of the transformation The uses part of the declaration specifies the model name and registered URI that the environment uses to resolve the MOF metamodel definition In the case of Eclipse QVT OML, MOF is equivalent to EMF s Ecore metamodel Therefore, URIs used here are those found in the NS URI field of packages registered in EMF To see a list of the models registered in the environment, use the Metamodel Explorer view provided by the M2M OML component It s also possible to specify modeltypes using Eclipse platform:/ plugin and platform:/resource Uniform Resource Identifiers (URIs) Note that it s not necessary to place the URI within parentheses following the model name The following is equivalent to our Unified Modeling Language (UML) modeltype declaration earlier:
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modeltype UML uses 'http://wwweclipseorg/examples/100/simpleuml';
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You also can simply state the model name, which, in the case of M2M OML, corresponds to the EMF registered package This allows some flexibility because several versions of a model could be registered in the environment, but it also can
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