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Load an ecore file programmatically [message #1754121]

Tue, 14 February 2017 10:54

Eclipse User

I try to load an ecore file which already exists in the plugins folder (I see it in the "registered epackages view, yet)
I find this code in the forum

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		// Create a resource set.
		ResourceSet resourceSet = new ResourceSetImpl();

		// Register the default resource factory -- only needed for stand-alone!
		resourceSet.getResourceFactoryRegistry().getExtensionToFactoryMap().put(
		"ecore", new EcoreResourceFactoryImpl());

		// Register the package -- only needed for stand-alone!
		EcorePackage ecorePackage = EcorePackage.eINSTANCE;

		// Get the URI of the model file.
		URI fileURI = URI.createPlatformPluginURI("platform:/plugin/org.eclipse.mymetamodel/model/MyMetaModel.ecore",false);

		// Demand load the resource for this file.
		Resource resource = resourceSet.getResource(fileURI, true);

		// Print the contents of the resource to System.out.
		try
		{
		resource.save(System.out, Collections.EMPTY_MAP);
		}
		catch (IOException e) {}
	}

but I have this error

Exception in thread "main" org.eclipse.emf.ecore.resource.impl.ResourceSetImpl$1DiagnosticWrappedException: java.net.MalformedURLException: unknown protocol: platform
	at org.eclipse.emf.ecore.resource.impl.ResourceSetImpl.handleDemandLoadException(ResourceSetImpl.java:319)
	at org.eclipse.emf.ecore.resource.impl.ResourceSetImpl.demandLoadHelper(ResourceSetImpl.java:278)
	at org.eclipse.emf.ecore.resource.impl.ResourceSetImpl.getResource(ResourceSetImpl.java:406)
	at faiez.test.odesign.LoadEmf.main(LoadEmf.java:32)
Caused by: java.net.MalformedURLException: unknown protocol: platform
	at java.net.URL.<init>(URL.java:600)
	at java.net.URL.<init>(URL.java:490)
	at java.net.URL.<init>(URL.java:439)
	at org.eclipse.emf.ecore.resource.impl.URIHandlerImpl.createInputStream(URIHandlerImpl.java:199)
	at org.eclipse.emf.ecore.resource.impl.ExtensibleURIConverterImpl.createInputStream(ExtensibleURIConverterImpl.java:360)
	at org.eclipse.emf.ecore.resource.impl.ResourceImpl.load(ResourceImpl.java:1269)
	at org.eclipse.emf.ecore.resource.impl.ResourceSetImpl.demandLoad(ResourceSetImpl.java:259)
	at org.eclipse.emf.ecore.resource.impl.ResourceSetImpl.demandLoadHelper(ResourceSetImpl.java:274)
	... 2 more

Any suggestions?

best regards

Re: Load an ecore file programmatically [message #1754141 is a reply to message #1754121]

Tue, 14 February 2017 12:19

Eclipse User

The platform protocol is registered by the Eclipse runtime so it doesn't work standalone. Why don't you just use the generated MyMetaModelPackage.eINSTANCE instead of trying to load it? If you must load it stand alone, using something like archive:file:/<file-system-location-of-jar>!/model/MyMetaModel.ecore. Or get a URL to it from the classpath.

Re: Load an ecore file programmatically [message #1754311 is a reply to message #1754141]

Thu, 16 February 2017 05:11

Eclipse User

Thanks Ed!
I want to load the metamodel because I would like use it as a model (instance of Ecore.ecore) to do a model transformation.
Indeed, I want to search the efeatures, classifiers, etc. in the metamodel

Re: Load an ecore file programmatically [message #1754312 is a reply to message #1754311]

Thu, 16 February 2017 05:13

Eclipse User

I want to transform the metamodel something.ecore to another format

Re: Load an ecore file programmatically [message #1754315 is a reply to message #1754312]

Thu, 16 February 2017 05:52

Eclipse User

I see. If the generated model is present, perhaps you can use MyMetaModelPackage.eNS_URI as the URI so that the transformation technology loads (fetches from the package registry), the MyMetaModelPackage.eINSTANCE...

Re: Load an ecore file programmatically [message #1831701 is a reply to message #1754121]

Wed, 26 August 2020 22:04

Eclipse User

Hi, I am able to get your code to work if I change:

// Get the URI of the model file.
URI fileURI = URI.createPlatformPluginURI("platform:/plugin/org.eclipse.mymetamodel/model/MyMetaModel.ecore",false);

to:

// Get the URI of the model file.
URI fileURI = URI.createFileURI("/path/to/saved/file.ecore");

I hope that helps!

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