Implementing Operations in Java

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135 Implementing Operations
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mapping UML::Property::primitiveAttribute2column(in targetType: UML::DataType) : RDB::TableColumn when { selfisPrimitive() } { init { var primitiveType : RDB::datatypes::PrimitiveDataType := object RDB::datatypes::PrimitiveDataType { name := umlPrimitive2rdbPrimitive(selftypename); }; } isPrimaryKey := selfisPrimaryKey(); name := selfname; type := primitiveType; }
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As stated earlier, objects that are created are first checked for existence If they are null, a new object of the stated type is instantiated and initialized in the order of the statements in the body If the object already exists, its contents are updated according to the statements in the body This implies that update semantics are used in object statements where an object has already been instantiated Consider this example:
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mapping UML::Property::primitiveAttribute2column(in targetType: UML::DataType) : RDB::TableColumn when { selfisPrimitive() } { init { result := object RDB::TableColumn { isPrimaryKey := selfisPrimaryKey(); type := object RDB::datatypes::PrimitiveDataType { name := umlPrimitive2rdbPrimitive(selftypename); }; }; } name := selfname; }
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This example shows the use of the result keyword, in addition to the inlining of mapping operations By default, the returned model instance of a mapping is assigned to the result, which we re explicitly setting here in the init section We re then updating the result in the mapping body to set the name property Technically, the implicit instantiation section that exists between the init section and the population section (or the mapping body, in this case) recognizes the existence of the instantiated result and incorporates update semantics
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CHAPTER 13 Query/View/Transformation Operational Mapping Language
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If you examine the output of this mapping, you ll find that isPrimaryKey and type are both set correctly during the init, while the name of the returned instance is simply updated in the mapping body without instantiating a new TableColumn Similarly, access to the result is available in the end{} block, as shown next Here again, update semantics are in effect in both the body and end blocks because there is an implicit instantiation of the return object
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mapping UML::Property::primitiveAttribute2column(in targetType: UML::DataType) : RDB::TableColumn when { selfisPrimitive() } { name := selfname; end { resultisPrimaryKey := selfisPrimaryKey(); resulttype := object RDB::datatypes::PrimitiveDataType { name := umlPrimitive2rdbPrimitive(selftypename); }; } }
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Another reason to explicitly create an object is for assignment to return parameters where more than one is defined for a mapping Consider this example:
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mapping X::toYZ() : y:Y, z:Z { object y:Y { }; object z:Z { }; }
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1355 Mapping Invocation
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When invoking a mapping, use either the map or xmap keyword, where xmap represents invocation with strict semantics The map keyword is used after a dot () or alternatively after an arrow (->) when using the collect shorthand When invocated, as long as the mapping can be resolved using the actual context and the guard conditions are satisfied (if present), the trace is consulted to look for target instances produced from the given source object If present, the relation holds and the previous result is returned Otherwise, the mapping body is executed In this first example, the input is being mapped using nonstrict semantics to a requirements Model using the more popular form of invocation
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135 Implementing Operations
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main(in mmap : mindmap::Map@inModel, out req : requirements::Model@outModel) { req := mmapmap toRequirementsModel(); } mapping mindmap::Map::toRequirementsModel() : requirements::Model { }
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If we simply change map to xmap, we change the invocation semantics to strict In this case, if the called mapping has a when clause that is not satisfied, an exception is thrown Using map, the mapping simply returns null
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main(in mmap : mindmap::Map@inModel, out req : requirements::Model@outModel) { req := mmapxmap toRequirementsModel(); }
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Both map and xmap can be called using an arrow instead of the dot notation This implies that the mapping operation is the body of an xcollect imperative collect construct
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