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How to convert GraphNodeWrapper to EObject [message #1840908]

Wed, 28 April 2021 15:49

jo ber

Messages: 94
Registered: August 2018

Member

Hi

Given the following eol query:

Object res = queryEngine.query(indexer, "return Company.all;", null);

How can I convert the GraphNodeWrapper object into EObject. An example would be welcome.

Kind regards,

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Re: How to convert GraphNodeWrapper to EObject [message #1840915 is a reply to message #1840908]

Wed, 28 April 2021 17:26

Antonio Garcia-Dominguez

Messages: 594
Registered: January 2010
Location: Birmingham, UK

Senior Member

Hi Jo,

The EOLQueryEngine class is EMF-agnostic, as well as GraphNodeWrapper: you cannot directly turn GNWs into EObjects. Instead, you should use .localhawkmodel files to expose a Hawk graph as an EMF resource, if you are using a local Hawk running in the same JVM. If you are accessing a remote model through the Thrift API, you will need to use a .hawkmodel file instead. For details on how to create .localhawkmodel files, check this page:

https://www.eclipse.org/hawk/advanced-use/graph-as-emf/

I can set up an example if you provide more details of your use case. Are you using Hawk from a pure Java program, or from an Eclipse plugin?

Best,
Antonio

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Re: How to convert GraphNodeWrapper to EObject [message #1840917 is a reply to message #1840915]

Wed, 28 April 2021 19:01

jo ber

Messages: 94
Registered: August 2018

Member

thank you very much!
Your answer put me on track. Looking at the documentation and at the generated '.localhawmodel' helped to figure out how to setup the resource:

		LocalHawkResourceImpl resource = new LocalHawkResourceImpl(URI.createURI("models"), indexer, false, patterns, patterns);
		resource.basicSetResourceSet(rs, null);
		resource.load(Collections.EMPTY_MAP);

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