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Use .jar as Xtext resource [message #1838777]

Thu, 04 March 2021 20:44

Jeremy Davies

Messages: 4
Registered: March 2021

Junior Member

Hi all,

Previously I was adding to a resource set (running as standalone) using:

String file = "file:///c:/foo.dp";
(LazyLinkingResource) resourceSet.getResource(URI.createURI(file),true);

Now, imagine that same foo.dp model is contained in a .jar file named foo.jar. Am I able to use this as a resource in a similar fashion as I don't really want to unpack the archive locally and then use a file URI .

String file = "file:///c:/foo.jar";
(LazyLinkingResource) resourceSet.getResource(URI.createURI(file),true);

When I try this I get the following

Exception in thread "main" java.lang.RuntimeException: Cannot create a resource for 'file:///c:/foo.jar'; a registered resource factory is needed
	at org.eclipse.xtext.resource.XtextResourceSet.getResource(XtextResourceSet.java:262)
	at org.eclipse.xtext.resource.SynchronizedXtextResourceSet.getResource(SynchronizedXtextResourceSet.java:25)

Thanks in advance,

Jez

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Re: Use .jar as Xtext resource [message #1838791 is a reply to message #1838777]

Fri, 05 March 2021 06:33

Ed Merks

Messages: 33142
Registered: July 2009

Senior Member

Use a scheme like archive, zip, or jar to access it. That works with any underlying URI scheme, not just file:, i.e., archive:<URI-of-jar/zip>!/<path-in-jar-zip-to-file-resource>, e.g., like this:

archive:http://www.eclipse.org/setups/setups.zip!/http/git.eclipse.org/c/oomph/org.eclipse.oomph.git/plain/setups/org.eclipse.setup

Ed Merks
Professional Support: https://www.macromodeling.com/

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Re: Use .jar as Xtext resource [message #1838819 is a reply to message #1838791]

Fri, 05 March 2021 16:52

Jeremy Davies

Messages: 4
Registered: March 2021

Junior Member

Hi - I can't open the link

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Re: Use .jar as Xtext resource [message #1838828 is a reply to message #1838819]

Fri, 05 March 2021 20:01

Ed Merks

Messages: 33142
Registered: July 2009

Senior Member

It's an example. A browser can't open such a link. A browser can't even open a link that uses jar: scheme, but a Java application can do that.; that's how Java works with jars on a classpath....

Ed Merks
Professional Support: https://www.macromodeling.com/

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Re: Use .jar as Xtext resource [message #1839034 is a reply to message #1838828]

Thu, 11 March 2021 15:55

Jeremy Davies

Messages: 4
Registered: March 2021

Junior Member

Got it.

Ok that works and I can load each resource into the resourceSet.

Now when I call the EcoreUtil.resolveAll() method I am still left with eProxyURL refs instead of concrete classes, not all the time, but sometimes.

I read on another forum post that I had to use platform:/resource or similar but I don't know how to do that.

Let's imagine my model is this:

- root/A.gen
- root/component/B.gen

And A has an array of class Bs
A.component = [B1, B2, B3]

resourceSet.getResource(URI.createURI("archive:file:///c:/mydir/myjar.jar!/root/A.gen"), true);
resourceSet.getResource(URI.createURI("archive:file:///c:/mydir/myjar.jar!/root/components/B1.gen"), true);
resourceSet.getResource(URI.createURI("archive:file:///c:/mydir/myjar.jar!/root/components/B2.gen"), true);
resourceSet.getResource(URI.createURI("archive:file:///c:/mydir/myjar.jar!/root/components/B3.gen"), true);

I then call:

EcoreUtil.resolveAll(resourceSet);

The resources are LazyLinkedResources - when I inspect the model and look at the proxyInformation variable I see an array of triples, the first of which points at a reference, as shown below:

If I'm looking at the in-memory model for A.gen I then see something similar to:

com.blah.A@250268ef (eProxyURI: archive:file:///c:/mydir/myjar.jar!/root/components/B1.gen#|1)

I just want to be able to resolve that reference and bring the contents of B into that location.

[Updated on: Thu, 11 March 2021 15:59]

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Re: Use .jar as Xtext resource [message #1839035 is a reply to message #1839034]

Thu, 11 March 2021 16:07

Ed Merks

Messages: 33142
Registered: July 2009

Senior Member

I don't know if anything special about Xtext is involved when resolving the fragment '#|1' . I can't comment on that in general. But if the resource itself loads with URI 'archive:file:///c:/mydir/myjar.jar!/root/components/B1.gen' then the problem has to be resolving the fragment within that resource which is specialized by the LazyLinkedResource implementation.

Ed Merks
Professional Support: https://www.macromodeling.com/

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Re: Use .jar as Xtext resource [message #1839039 is a reply to message #1839035]

Thu, 11 March 2021 16:25

Jeremy Davies

Messages: 4
Registered: March 2021

Junior Member

Do you know how I can get get the .jar file described above to be made available via:

"platform:/resource/blah/A.get"

[Updated on: Thu, 11 March 2021 16:28]

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Re: Use .jar as Xtext resource [message #1839047 is a reply to message #1839039]

Thu, 11 March 2021 18:43

Ed Merks

Messages: 33142
Registered: July 2009

Senior Member

If your files are physcally in a jar and you want to access them in that jar directly, I don't see that platform:/resource will help. This is scheme typically used to reference things in an Eclipe workspace....

Ed Merks
Professional Support: https://www.macromodeling.com/

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Re: Use .jar as Xtext resource [message #1839094 is a reply to message #1839047]

Sat, 13 March 2021 14:40

Ed Willink

Messages: 7655
Registered: July 2009

Senior Member

Hi

Quote:

I don't know if anything special about Xtext is involved when resolving the fragment '#|1' .

~|nnn is very special in Xtext. I think nnn is the nnn'th unresolved reference in the concrete syntax text. It is passed as a triple to the LinkingService when standard EMF activities resolve the proxy.

Regards

Ed

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