Generating CSV Files in Java

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72 Generating CSV Files
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To begin with the simplest example imaginable, we use Xpand here to output a simple comma-separated values (CSV) file from our mindmap model The first step is to create a template in a /templates/deploy source folder of our orgeclipsedslmindmap project named mindmap2csvxpt and complete it with the following text:
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IMPORT mindmap DEFINE Main FOR Map FILE (title == null "map" : title) + "csv"- FOREACH elementstypeSelect(mindmap::Topic) AS topic- topicname , topicpriority , topicstart , topicend ENDFOREACH ENDFILE ENDDEFINE
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The template begins with a simple import of our mindmap model and the definition of a template named Main that operates on a passed-in Map instance,
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CHAPTER 7 Developing Model-to-Text Transformations
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located using the source path project settings The FILE directive creates a new CSV file with the name equal to the title of our map Note that the end <<guillemet>> has a hyphen before it This indicates that white space should be stripped from the contents of this element We need this to ensure that our CSV file has no leading spaces or empty lines The FOREACH directive iterates over our Topic elements, which are distinguished from our Relationship elements using the typeSelect(mindmap:: Topic) operation We refer to each Topic instance during iteration as topic and access its attributes for output, inserting commas in between To invoke this template on our Mindmapxmi dynamic instance, we need to configure our project and add the following mindmap2csvmwe file
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< xml version="10" > <workflow> <property name="model" value="platform:/resource/orgeclipsedslmindmap/model/Mindmapxmi"/> <property name="out" value="out" /> <! set up EMF for standalone execution > <bean class="orgeclipseemfmweutilsStandaloneSetup"> <platformUri value="/" /> </bean> <component class="orgeclipseemfmweutilsReader"> <uri value="${model}" /> <modelSlot value="model" /> </component> <! generate code > <component class="orgeclipsexpand2Generator"> <metaModel id="mm" class="orgeclipsextendtypesystememfEmfRegistryMetaModel"/> <expand value="mindmap2csv::Main FOR model" /> <outlet path="${out}"/> </component> </workflow>
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The workflow contains two component elements, one for the EMF reader that knows about our Ecore model and the other for the generator itself The StandaloneSetup bean is initialized to the root of the workspace You can find information on the workflow engine in Section 14116, Workflow Engine
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73 Generating Java
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As we ve mentioned previously, you must consider at least two possibilities when generating Java, or any programming language, from models The first is to use
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M2M from a source model into a Java model, followed by Java generation using dedicated templates The alternative is to pass the source model to a set of templates designed to output Java code In the former, the logical mapping from one model to the other takes place in the mappings of QVT; in the latter, the logic resides in Xpand and Xtend code throughout the templates and extension files Sometimes one approach is superior to the other; as with the two following examples, both are feasible when transforming our Domain-Neutral Component (DNC) models to Java Persistence API (JPA) code
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BEST PRACTICE
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This might seen obvious, but it s typically easier to first write code that works and templify it than to try to work in a template environment from the beginningThis applies to all text output formats, not just Java
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731 Using Java Model and Dedicated Template
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In this section, we develop the template used to generate Java code from our Java EMF Model (JEM) instance We use a single template, which you can see in its entirety next, followed by the Xtend utilities used by the template The Main definition takes a collection of JavaPackage elements As you can see in the corresponding workflow file used to invoke the template, the source model can contain multiple root elements, which explains the use of Collection The package definition is invoked for each JavaPackage, which expands each JavaClass that is not marked with a library annotation Subpackages are then processed recursively The jemUtilext file contains the functions used throughout to construct fully qualified class, package, and path strings
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IMPORT java EXTENSION templates::java::jemUtil DEFINE Main FOR Collection[java::JavaPackage] EXPAND package FOREACH thistypeSelect(JavaPackage) ENDDEFINE DEFINE package FOR java::JavaPackage- EXPAND class FOREACH javaClassesselect(c | ceAnnotationsfirst()source != library') EXPAND package FOREACH eSubpackagestypeSelect(JavaPackage) ENDDEFINE
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