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Loading resource interception... [message #528547]

Tue, 20 April 2010 22:08

Babloo

Messages: 12
Registered: September 2009

Junior Member

Hello there,

I am trying to load a xml file into XMLResource using a resourceset.
The following code snippet works fine...

//code fragment in init a resourceSet.
ResourceSet resourceSet;
resourceSet.getResourceFactoryRegistry().getExtensionToFactoryMap().put("*", new ModelXMLResourceFactory());
        resourceSet.getPackageRegistry().put(CommonPackage.eNS_URI, CommonPackage.eINSTANCE);
                resourceSet.setURIConverter(new ModelURNConverter());

 public EObject loadEObject(URI uri) {
        Resource resource = resourceSet.createResource(uri);
        try {
            resource.load(null);
        } catch (IOException e) {
            throw new RuntimeException("Error occured while reading EObject to file", e);
        }
        return resource.getContents().get(0);
    }

I have some persisted XML in filesystem that can load fine.
Now, I have some changes made to the ECore file where I have moved some attributes around. Is there a way I could transform this persisted XML file, while the resource is being loaded?
Also wondering, if I could do the reverse, where I might be able to transform the newly generated XML back to another file.
I could write some XSLs to do load & save. But, I would need some advice on the hooks where I could do the load resource / save resource transformation.

Thanks,
Babloo

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Re: Loading resource interception... [message #528683 is a reply to message #528547]

Wed, 21 April 2010 13:04

Ed Merks

Messages: 33140
Registered: July 2009

Senior Member

This is a multi-part message in MIME format.
--------------090708030807020401010308
Content-Type: text/plain; charset=UTF-8; format=flowed
Content-Transfer-Encoding: 7bit

Babloo,

This is likely useful:

5.1 Recipe: Data Migration
<http://wiki.eclipse.org/EMF/Recipes#Recipe:_Data_Migration>

Babloo wrote:
> Hello there,
>
> I am trying to load a xml file into XMLResource using a resourceset.
> The following code snippet works fine...
>
>
> //code fragment in init a resourceSet.
> ResourceSet resourceSet;
> resourceSet.getResourceFactoryRegistry().getExtensionToFacto ryMap().put( "*",
> new ModelXMLResourceFactory());
> resourceSet.getPackageRegistry().put(CommonPackage.eNS_URI,
> CommonPackage.eINSTANCE);
> resourceSet.setURIConverter(new ModelURNConverter());
>
> public EObject loadEObject(URI uri) {
> Resource resource = resourceSet.createResource(uri);
> try {
> resource.load(null);
> } catch (IOException e) {
> throw new RuntimeException("Error occured while reading
> EObject to file", e);
> }
> return resource.getContents().get(0);
> }
>
>
> I have some persisted XML in filesystem that can load fine.
> Now, I have some changes made to the ECore file where I have moved
> some attributes around. Is there a way I could transform this
> persisted XML file, while the resource is being loaded?
> Also wondering, if I could do the reverse, where I might be able to
> transform the newly generated XML back to another file.
> I could write some XSLs to do load & save. But, I would need some
> advice on the hooks where I could do the load resource / save resource
> transformation.
>
> Thanks,
> Babloo
>

--------------090708030807020401010308
Content-Type: text/html; charset=UTF-8
Content-Transfer-Encoding: 8bit

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<meta content="text/html;charset=UTF-8" http-equiv="Content-Type">
</head>
<body bgcolor="#ffffff" text="#000000">
Babloo, 
 
This is likely useful: 
<blockquote><a
href="http://wiki.eclipse.org/EMF/Recipes#Recipe:_Data_Migration">5.1 Recipe: Data
Migration</a> 
</blockquote>
 
Babloo wrote:
<blockquote cite="mid:hql8kt$ofe$1@build.eclipse.org" type="cite">Hello
there,
 
 
I am trying to load a xml file into XMLResource using a resourceset.
The following code snippet works fine...
 
 
 
//code fragment in init a resourceSet.
 
ResourceSet resourceSet;
 
resourceSet.getResourceFactoryRegistry().getExtensionToFacto ryMap().put( "*",
new ModelXMLResourceFactory());
 
 resourceSet.getPackageRegistry().put(CommonPackage.eNS_URI,
CommonPackage.eINSTANCE);
 
 resourceSet.setURIConverter(new ModelURNConverter());
 
 
public EObject loadEObject(URI uri) {
 
 Resource resource = resourceSet.createResource(uri);
 
 try {
 
 resource.load(null);
 
 } catch (IOException e) {
 
 throw new RuntimeException("Error occured while reading
EObject to file", e);
 
 }
 
 return resource.getContents().get(0);
 
 }
 
 
 
I have some persisted XML in filesystem that can load fine.
 
Now, I have some changes made to the ECore file where I have moved some
attributes around. Is there a way I could transform this persisted XML
file, while the resource is being loaded?
 
Also wondering, if I could do the reverse, where I might be able to
transform the newly generated XML back to another file.
 
I could write some XSLs to do load & save. But, I would need some
advice on the hooks where I could do the load resource / save resource
transformation.
 
 
Thanks,
 
Babloo
 
 
</blockquote>
</body>
</html>

--------------090708030807020401010308--

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

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Re: Loading resource interception... [message #528753 is a reply to message #528683]

Wed, 21 April 2010 16:23

Babloo

Messages: 12
Registered: September 2009

Junior Member

Thanks for the response Ed.
In my case I have the same namespace URN for the old and new ecore model. In general, I may not be having the old ecore model around.
Do you think, I could override...
public void doLoad(InputStream inputStream, Map<?, ?> map) throws IOException

to get do some kind of XSLT?

Thanks,
Babloo

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Re: Loading resource interception... [message #528761 is a reply to message #528753]

Wed, 21 April 2010 16:39

Ed Merks

Messages: 33140
Registered: July 2009

Senior Member

Babloo,

Likely you'd have to specialize XMLHandler and XMLSaveImpl.
OPTION_RECORD_UNKNOWN_FEATURES might allow you to post process/ pre
process what you load/save.

Babloo wrote:
> Thanks for the response Ed. In my case I have the same namespace URN
> for the old and new ecore model. In general, I may not be having the
> old ecore model around.
> Do you think, I could override...
> public void doLoad(InputStream inputStream, Map<?, ?> map) throws
> IOException
>
> to get do some kind of XSLT?
>
> Thanks,
> Babloo
>
>

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

Report message to a moderator

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