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how load xml emf resource using api [message #1422119]

Fri, 12 September 2014 10:57

Tom Hassan

Messages: 3
Registered: September 2014

Junior Member

Hi ! How can I load the xml emf resource in order to call the queries using EMF IncQuery API ? I do not find anywhere . Thank you !

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Re: how load xml emf resource using api [message #1422207 is a reply to message #1422119]

Fri, 12 September 2014 13:45

Gabor Bergmann

Messages: 36
Registered: July 2009

Member

Hi,

Which "xml emf resource" do you mean? The one that contains the EMF instance model, the contents of which you wish to query?

If so, you can use the standard EMF API to instantiate a ResourceSet and use it to load the Resource. This is a general mechanism of EMF, not specific to EMF-IncQuery.

Hope that helps,
Gábor

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Re: how load xml emf resource using api [message #1422213 is a reply to message #1422207]

Fri, 12 September 2014 13:54

Made Leine

Messages: 11
Registered: September 2014

Junior Member

Yes . So , I loaded the instance model , but how can I query on this model ? I managed through API to load the model , the .eiq file , to get its content , but I am stuck here . I am sorry , I really can't understand . I used IncQueryHeadlessAdvanced for headless example.

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Re: how load xml emf resource using api [message #1422227 is a reply to message #1422213]

Fri, 12 September 2014 14:19

Gabor Bergmann

Messages: 36
Registered: July 2009

Member

Made Leine wrote on Fri, 12 September 2014 15:54

Yes . So , I loaded the instance model , but how can I query on this model ? I managed through API to load the model

I recommend reading the Javadoc of IncQueryEngine.
You should use e.g. IncQueryEngine.on(myResourceSet) to obtain an IncQuery instance that can evaluate queries against the model in the given resource set. You can then obtain Matcher objects associated with individual query specifications.

Made Leine wrote on Fri, 12 September 2014 15:54

I used IncQueryHeadlessAdvanced for headless example.

Well, this example method takes a parameter fileURI, which should be the URI of the instance model. However, you should not call this method, but rather read its code Smile

The headless example code, as well as its advanced version, is meant as a code example for you to read, in order to demonstrate the usage of the EMF-IncQuery API. It is not the API itself, it merely uses the API in one specific way. If you read the code, I believe it will be easy to follow.

I hope this clears it up for you,
Gábor

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Re: how load xml emf resource using api [message #1422230 is a reply to message #1422227]

Fri, 12 September 2014 14:23

Zoltan Ujhelyi

Messages: 392
Registered: July 2015

Senior Member

Hi,

I would add that it is better to look at the Usage examples part of the documentation: https://wiki.eclipse.org/EMFIncQuery/UserDocumentation/API#Typical_programming_patterns

It contains several different examples about using the IncQuery runtime API.

Cheers,
Zoltán

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