Developing a DSL Graphical Notation - Eclipse Modeling Project: A Domain-Specific Language Toolkit - page 118

After we add the Custom Behaviour element to the generation model, the
generated code references the ToolTip class. The GMF generator knows noth-
ing of our custom template, and there's no way currently to add new template
definitions to the execution environment. We need to create our own workflow
and run a second-generation step to produce the referenced ToolTip
EditPolicy class. Section 14.1.16, “Workflow Engine,” covers workflows, but
for now, just use File Workflow

Definition to create a tooltip.mwe file in the /workflows folder. Next you can
see the workflow used to invoke our template following the normal GMF dia-
gram generation; it includes a number of model references. As such, it's necessary
to add the following plug-ins as dependencies of our project in the MANIFEST.MF
file: org.eclipse.gmf.codegen , org.eclipse.gmf.runtime.notation ,
and org.eclipse.gmf.validate . Curiously, you also need to add org.
eclipse.core.runtime , org.eclipse.jdt.core , and

→ New → Other → Model Transformation →

org.eclipse.

jface.text .

<?xml version="1.0"?>
< workflow >
< property
name="model"
value="platform:/resource/org.eclipse.dsl.requirements/
diagrams/Tooltip.xmi" />
< property name="out"
value="../org.eclipse.requirements.diagram/src" />

<!-- set up EMF for standalone execution -->
< bean class="org.eclipse.emf.mwe.utils.StandaloneSetup">
< platformUri value="../" />
< RegisterGeneratedEPackage
value="org.eclipse.gmf.codegen.gmfgen.GMFGenPackage"/>
< RegisterGeneratedEPackage
value="org.eclipse.gmf.runtime.notation.NotationPackage"/>
</ bean >

< component class="org.eclipse.emf.mwe.utils.Reader">
< uri value="${model}" />
< modelSlot value="model" />
</ component >

<!-- generate code -->
< component class="org.eclipse.xpand2.Generator">
< metaModel id="mm"
class="org.eclipse.xtend.typesystem.emf.EmfRegistryMetaModel"/>
< expand value="TooltipEditPolicy::Main FOR model" />
< outlet path="${out}">
< postprocessor
class="org.eclipse.xpand2.output.JavaBeautifier" />