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 := name + '_' + digit; } else { name := name + digit; } endif; pos := pos + 1; }; return nametoUpperCase(); }
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switch
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The switch imperative expression evaluates condition-based alternatives It is popular when dealing with enumeration types, as shown in the following example Note that the more familiar case syntax is also available, in addition to what s shown here
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query mindmap::Topic::getPriority() : String { var pri : String := null; switch { (selfpriority = Priority::HIGH) pri := 'High'; (selfpriority = Priority::MEDIUM) pri := 'Medium'; (selfpriority = Priority::LOW) pri := 'Low'; else assert fatal (false) with log('Priority unsupported', self); }; return pri; }
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In the example, the priority is evaluated against the enumeration literal, with a String returned for each match If no matches are found, the else statement invokes a fatal assertion to terminate execution and log the appropriate message
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1353 Imperative Iterate Expressions
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A set of six imperative iterate expressions are available: xcollect, collect One, collectselect, collectselectOne, xselect, and selectOne Each of these iterates over the source collection to populate the target using iterator variables, a body, and a condition expression These are similar to their OCL counterparts but can be interrupted using break, continue, raise, and return expressions Perhaps the most important difference is that null values are not included in the result set The xcollect imperative iterate expression is similar to its collect counterpart, but with the important distinction that it does not flatten the result This makes it more comparable to the OCL collectNested() operation This
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135 Implementing Operations
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means that xcollect can return nested collections such as {1, {2, 3}}, which collect would otherwise return as {1, 2, 3} As for the collection types xcollect operates on and returns, Sets and Bags result in a Bag, while OrderedSets and Sequences result in a Sequence In both cases, duplicates are possible You can think of the collectselect imperative iterate expression as a single loop combination of collect and select, where null values are removed from the result The remaining iterators are self-explanatory The type of objects contained within the results of these iterators depends on the use of its conditional, if specified When a Type is specified as the conditional, it is evaluated using the Boolean oclIsKind(Type) and returns a sequence casted to the specified Type Shorthand notation is available for these imperative expressions, as described in the following examples Notice that the shorthand is also available to operations, as shown in the last two examples
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-- An example of collectselect selfelements->collectselect(i; a=iname | astartsWith('A')); -- An equivalent collectselect using shorthand notation selfelements->name[a | astartsWith('A')]; -- An equivalent collectselect shorthand without a target variable selfelements->name[startsWith('A')]; -- An example of xcollect selfelements->xcollect(a | aname); -- An equivalent xcollect using shorthand notation selfelements->name; -- An example of xselect selfelements->xselect(Topic); -- An equivalent xselect using shorthand notation selfelements[Topic]; -- An example of collectselect shorthand with an operation main() { inModelrootObjects()[Map]map toRequirementsModel(); } -- An example of collectselectOne shorthand using '!' main() { inModelrootObjects()![Map]map toRequirementsModel(); }
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CHAPTER 13 Query/View/Transformation Operational Mapping Language
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1354 Object Creation and Population
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As mentioned earlier, a mapping invocation implicitly creates an instance of the declared return type or types The features of instantiated elements are set using the assignment operator (:=), as shown earlier with the name := selfname statement Although this works for mappings of simple attributes of the same type, more complex mappings necessarily require more complex expressions Note that a second assignment operator (+=) is available for adding to collections To create an object within the context of an operation, use the object keyword Following is a basic object expression that creates an instance of PrimitiveDataType and assigns it to the type reference in the TableColumn object created by the mapping:
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type := object RDB::datatypes::PrimitiveDataType { name := 'int'; };
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In fact, the entire body of a mapping can be contained within an object block, as shown in the complete mapping definition This is not necessary, however, because the return type of the mapping is enough to determine what the body is instantiating
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mapping UML::Property::primitiveAttribute2column(in targetType: UML::DataType) : RDB::TableColumn when { selfisPrimitive() } { object RDB::TableColumn { isPrimaryKey := selfisPrimaryKey(); name := selfname; type := object RDB::datatypes::PrimitiveDataType { name := umlPrimitive2rdbPrimitive(selftypename); }; } }
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A common use of object is to initialize variables in the init section For example, the following snippet has a variable primitiveType assigned to an object that was created and initialized using the umlPrimitive2rdbPrimitive() query, which is later used to set the TableColumn s type reference
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