Query/View/Transformation Operational Mapping Language in Java

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CHAPTER 13 Query/View/Transformation Operational Mapping Language
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name Also, the sample uses the URI declared by the models in their EMF registration, which align better with the EMF convention It would be possible to import each model into the project and add Metamodel Mappings in the project properties and assign the original URI, as shown next The only other difference is the model names, which, in this case, reflect the names assigned in the Ecore models
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modeltype UML uses simpleuml("omgqvt-samplesSimpleUML"); modeltype RDBMS uses rdb("omgqvt-samplesSimpleRDBMS"); transformation Uml2Rdb(in srcModel:UML,out RDBMS);
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Looking at the transformation declaration, because only one transformation is defined in the file, no braces are required to surround its contents Note also that a name is assigned to the input UML model but not to the RDBMS output model The entry point of a QVTO transformation is its main mapping As you can see here, the UML::Model class is passed in as the root object, and the out parameter instantiates and returns an RDB::Model object Both the input and output parameters are given a name to be accessed by within the body of the mapping
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main(in model: UML::Model, out rdbModel: RDB::Model) { rdbModel:= modelmap model2RDBModel(); }
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In the body, the rdbModel output is assigned the results of the model2RDBModel() mapping, which is invoked by appending map to the model element, indicating that it will be passed as the input to the mapping The model2RDBModel() mapping is straightforward and could have been folded into the main mapping The name of the UML model is mapped to the name of the RDB model, and the UML::Model element is passed to the package2schemas query
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mapping UML::Model::model2RDBModel() : RDB::Model { name := selfname; schemas := selfpackage2schemas(); }
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The package2schemas() query returns an OrderedSet of Schema objects, which are created from the package and its subpackages In the body of the query, the UML::Package is mapped to an RDB::Schema object by the package2schema() mapping The result is unioned with a mapping of
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138 Simple UML to RDBMS Example
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subpackages, recursively obtained with calls to package2schemas() for each subpackage
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query UML::Package::package2schemas() : OrderedSet(RDB::Schema) { selfmap package2schema()->asSequence()-> union(selfgetSubpackages()->collect(package2schemas())) ->asOrderedSet() }
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Looking at the package2schema() mapping, you can see our first when clause in the script We want to map UML Package elements to RDB Schema elements only if they contain persistent classes The hasPersistentClasses() query can determine this; you can see it here along with the isPersistent() query it uses As you can see, a class is persistent if it contains a stereotype equal to the String 'persistent'
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query UML::Package::hasPersistentClasses() : Boolean { ownedElements->exists( let c : UML::Class = oclAsType(UML::Class) in coclIsUndefined() implies cisPersistent()) } query UML::ModelElement::isPersistent() : Boolean { stereotype->includes('persistent') }
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The mapping from package to schema involves selecting and collecting all the UML::Class instances from the package and invoking the persistentClass2table() mapping
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mapping UML::Package::package2schema() : RDB::Schema when { selfhasPersistentClasses() } { name := selfname; elements := selfownedElements->select(oclIsKindOf(UML::Class))-> collect(oclAsType(UML::Class)map persistentClass2table()) ->asOrderedSet() }
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The persistentClass2table() mapping appears next A when clause eliminates classes that are not persistent using the same query that was used earlier to determine whether a package contained at least one persistent class The name of the table is mapped from the name of the class The columns of the table are created by the class2columns() query and sorted by name Primary keys are created using the class2primaryKey() mapping, while foreign keys are created using the class2foreignKeys() query
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CHAPTER 13 Query/View/Transformation Operational Mapping Language
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mapping UML::Class::persistentClass2table() : RDB::Table when { selfisPersistent() } { name := selfname; columns := selfclass2columns(self)->sortedBy(name); primaryKey := selfmap class2primaryKey(); foreignKeys := selfclass2foreignKeys(); }
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The class2columns() query combines the results of the dataType2columns() and generalizations2columns() for the class passed as a parameter, returning the union as an ordered set
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query UML::Class::class2columns(targetClass: UML::Class) : OrderedSet(RDB::TableColumn) { selfdataType2columns(targetClass)-> union(selfgeneralizations2columns(targetClass)) ->asOrderedSet() }
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The dataType2columns() query combines the results of queries that create columns from primitive, enumeration, relationship, and association attributes, rejecting those that are undefined
query UML::DataType::dataType2columns(in targetType : UML::DataType) : OrderedSet(RDB::TableColumn) { selfprimitiveAttributes2columns(targetType)-> union(selfenumerationAttributes2columns(targetType))-> union(selfrelationshipAttributes2columns(targetType))-> union(selfassosiationAttributes2columns(targetType)) ->reject(c|coclIsUndefined())->asOrderedSet() }
The generalizations2columns() query uses the class2columns() query on the general class, rejects those undefined, and returns an ordered set
query UML::Class::generalizations2columns(targetClass : UML::Class) : OrderedSet(RDB::TableColumn) { selfgeneralizations->collect(g | ggeneralclass2columns(targetClass)) ->reject(c|coclIsUndefined())->asOrderedSet() }