Transforming a Business Model to Java in Java

Painting QR Code 2d barcode in Java Transforming a Business Model to Java
69 Transforming a Business Model to Java
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value := value; } } } /** * Maps visibility to Java types */ query oocore::Visibility::toVisibility() : java::JavaVisibilityKind { if self = oocore::Visibility::PRIVATE then { return java::JavaVisibilityKind::PRIVATE} else if self = oocore::Visibility::PUBLIC then { return java::JavaVisibilityKind::PUBLIC} else if self = oocore::Visibility::PROTECTED then { return java::JavaVisibilityKind::PROTECTED} endif endif endif; return java::JavaVisibilityKind::PACKAGE } /** * Replaces camel case with underscore, eg firstName -> FIRST_NAME */ query String::toColumnName() : String { var name : String := ''; var digit : String := ''; var pos : Integer := 1; while (pos <= selfsize()) { digit := selfsubstring(pos, pos); if digittoLowerCase() <> digit then { name := name + '_' + digit; } else { name := name + digit; } endif; pos := pos + 1; }; return nametoUpperCase(); } query oocore::Class::isEntity() : Boolean { return selfoclIsTypeOf(dnc::MomentInterval) or selfoclIsTypeOf(dnc::MIDetail) or selfoclIsTypeOf(dnc::Party) or selfoclIsTypeOf(dnc::Place) or selfoclIsTypeOf(dnc::Thing) or selfoclIsTypeOf(dnc::Description); } /** * Returns dot '' delimited packageClass string */ query oocore::Class::fullyQualifiedName() : String { var fqn : String := selfname; var pkg : oocore::Package := self_package; while (not pkgoclIsUndefined()) {
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CHAPTER 6 Developing Model-to-Model Transformations
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fqn := pkgname + '' + fqn; pkg := pkg_package; }; return fqn; }
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Figure 6-21 is a sample output model for our test input model What s striking is the size of the model, which seems quite disproportionate, compared to the concrete syntax of what we ll produce using our Xpand templates Nevertheless, it took little time to produce from our business model and will provide straightforward transformation to Java compilation units, as shown in Section 731, Using Java Model and Dedicated Template
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Figure 6-21
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Transformation JEM output model
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610 Summary
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In this chapter, we took a look at the functionality provided by the QVT OML implementation provided by the Eclipse M2M project We saw some of the more popular use cases for M2M, leaving M2Ts using the Xpand component of the Eclipse M2T project for the next chapter
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Developing Model-to-Text Transformations
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Working with domain-specific languages (DSLs) in the form of their abstract syntax, concrete syntax, and Model-to-Model Transformations (M2M) is great, but what we typically want to derive is a working software application, a database schema, or even some documentation from our models This is where Model-to-Text Transformations (M2T) come into play We typically generate code in the form of some general-purpose programming language such as Java, or even output HTML from our model instances As touched upon in 6, Developing Model-to-Model Transformations, considerations must be made when selecting a transformation technology, both M2M and M2T Either or both can fulfill your needs, with some form of workflow required in the case of the latter Numerous code-generation technologies are available, both within and outside Eclipse Within the Modeling project are several facilities for code generation from models The home for most of these components is the M2T project
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71 M2T Project
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Two main components within the M2T project exist for code generation from models: Java Emitter Templates (JET) and Xpand JET is the traditional template engine that was used with Eclipse Modeling Framework (EMF) and is closely aligned with Java Server Pages (JSP) It was extracted from EMF and improved into what s now referred to as JET2 We don t cover JET in this book because of space considerations Instead, we focus on the capabilities of Xpand as a template engine to complement our DSL Toolkit
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CHAPTER 7 Developing Model-to-Text Transformations
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It s worth pointing out that a third option will soon be available from M2T The Model to Text Language (MTL) component will provide an implementation of the OMG s MOF Model to Text Language standard Furthermore, Core and Shared components are planned for M2T, with the goal of providing shared components and a framework for the invocation of M2T transformations, regardless of the language None of these components were available at the time of this writing, but future editions of this book might cover them
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