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Model without a root object [message #951004]

Sat, 20 October 2012 10:00

Lester William Polsfuss

Messages: 3
Registered: October 2012

Junior Member

Hi,

I'm working on a M2T project that generates code from a java model. This model defines a number of class objects that have instance variables, methods etc.
When the workflow is executed, it will only generate the code for the first class defined in the model and not for all classes.

I suspect that this is caused by the fact that my java model has no 'root' object. Most tutorials on the matter assume a root object like 'Model'.

Is it possible to make a 'main' definition such that all instances of that type are considered without having a root object in the model?

This is how the current main definition looks like:

«DEFINE main FOR Class»
«FILE name.toString() + ".java"»
public class «name» {

	«EXPAND field FOREACH field»
        ...
}
«ENDFILE»
«ENDDEFINE»

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Re: Model without a root object [message #951391 is a reply to message #951004]

Sat, 20 October 2012 17:52

Christian Dietrich

Messages: 14665
Registered: July 2009

Senior Member

Hi,

it always depends on how you call the template. so can you give us a bit more context.

~Christian

Twitter : @chrdietrich
Blog : https://www.dietrich-it.de

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Re: Model without a root object [message #951400 is a reply to message #951391]

Sat, 20 October 2012 18:03

Lester William Polsfuss

Messages: 3
Registered: October 2012

Junior Member

Hi Christian,

The template is called from a workflow files which was generated by eclipse / XPand new project wizard.

This are the content of generator.mwe

<?xml version="1.0"?>
<workflow>
	<property name="model" value="javaprogram.project/src/JavaProgram.xmi" />
	<property name="src-gen" value="src-gen" />
	
	<!-- set up EMF for standalone execution -->
	<bean class="org.eclipse.emf.mwe.utils.StandaloneSetup" >
		<platformUri value=".."/>
	</bean>
	
	<!-- instantiate metamodel -->
	<bean id="mm_emf" class="org.eclipse.xtend.typesystem.emf.EmfRegistryMetaModel"/>

	<!-- load model and store it in slot 'model' -->
	<component class="org.eclipse.emf.mwe.utils.Reader">
		<uri value="platform:/resource/${model}" />
		<modelSlot value="model" />
	</component>

	<!-- check model -->
	<component class="org.eclipse.xtend.check.CheckComponent">
		<metaModel idRef="mm_emf"/>
		<checkFile value="metamodel::Checks" />
		<emfAllChildrenSlot value="model" />
	</component>

	<!--  generate code -->
	<component class="org.eclipse.xpand2.Generator">
		<metaModel idRef="mm_emf"/>
		<expand
			value="template::javaprogram::main FOR model" />
		<outlet path="${src-gen}" >
			<postprocessor class="org.eclipse.xpand2.output.JavaBeautifier" />
		</outlet>
	</component>
</workflow>

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Re: Model without a root object [message #951418 is a reply to message #951400]

Sat, 20 October 2012 18:21

Christian Dietrich

Messages: 14665
Registered: July 2009

Senior Member

Hi,

you may try

<expand
			value="template::javaprogram::main FOREACH model" />

instead

Twitter : @chrdietrich
Blog : https://www.dietrich-it.de

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Re: Model without a root object [message #952183 is a reply to message #951418]

Sun, 21 October 2012 08:17

Lester William Polsfuss

Messages: 3
Registered: October 2012

Junior Member

Unfortunately, this doesn't work. I get the following error when running the code generation:

Quote:

[ERROR]: Collection expected!(Element: EXPAND template::javaprogram::main FOREACH model; Reported by: Generator: generating 'template::javaprogram::main FOREACH model' => src-ge

I think FOREACH can only be used on a collection. Is there a way to obtain all child nodes from the model?

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Re: Model without a root object [message #952241 is a reply to message #952183]

Sun, 21 October 2012 09:26

Christian Dietrich

Messages: 14665
Registered: July 2009

Senior Member

This error message makes finally clear: you HAVE a root object.
you still can use EMF means to get children e.g. eContents/eAllContents.
it would help if you could share some information on your metamodel
to give you some better advice on what to do.

~Christian

Twitter : @chrdietrich
Blog : https://www.dietrich-it.de

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