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[EMF Compare] Comparing models without resources [message #136716]

Sun, 24 May 2009 03:27

Patrick Konemann

Messages: 116
Registered: July 2009

Senior Member

Cheers,

I wonder if it is at all possible to compare just two in-memory models with EMF Compare?
Regarding the API, it should be, since MatchService.doMatch takes EObjects and not Resources.
However, the match engine uses the resources (which are not set in the example below) to perform the comparison.

My use case is a comparison of partial models, i.e. the compared EObjects are contained in another, larger model.
For example, two sub-packages in a UML model.

Any suggestions and comments are appreciated.
Patrick

// this creates two simple EObjects for comparison, but a NullPointer is raised because the resources are not set
MatchService.doMatch(createDynamicObject("a"), createDynamicObject("b"), Collections.<String, Object> emptyMap());

/** Just to create a simple EObject just having a name. */
private EObject createDynamicObject(String name) {
// create the wrapper containment reference
final EAttribute attr = EcoreFactory.eINSTANCE.createEAttribute();
attr.setName("name");
attr.setEType(EcorePackage.Literals.ESTRING);

// create the wrapper class
final EClass namedClass = EcoreFactory.eINSTANCE.createEClass();
namedClass.setName("DynamicNamedElement");
namedClass.getEStructuralFeatures().add(attr);

// create a package for our wrapper class
final EPackage simplePackage = EcoreFactory.eINSTANCE.createEPackage();
simplePackage.setName("dynamic");
simplePackage.setNsPrefix("dynamic");
simplePackage.setNsURI("http://www.example.org/dynamic");
simplePackage.getEClassifiers().add(namedClass);

// validate what we just created
if (Diagnostician.INSTANCE.validate(simplePackage).getCode() == Diagnostic.OK) {

// instantiate our class, fill the children and return it
final EObject namedClassInstance = simplePackage.getEFactoryInstance().create(namedClass);
namedClassInstance.eSet(attr, name);
return namedClassInstance;
} else {
return null; // TODO: better error handling required here
}
}

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Re: [EMF Compare] Comparing models without resources [message #136955 is a reply to message #136716]

Thu, 04 June 2009 15:10

Laurent Goubet

Messages: 1902
Registered: July 2009

Senior Member

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Hi Patrick,

I'll simply quote the javadoc :

MatchService.doMatch : "Matches two models and returns the corresponding
matching model."

=> what is meant here is : regardless of the EObjects passed as
arguments, we'll compare their containing resources.

MatchService.doContentMatch : "Matches two objects along with their
content, then return the corresponding match model."

=> this is what you seek to do.

Laurent Goubet
Obeo

Patrick K

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Re: [EMF Compare] Comparing models without resources [message #136991 is a reply to message #136955]

Tue, 09 June 2009 08:20

Patrick Konemann

Messages: 116
Registered: July 2009

Senior Member

Thanks Laurent and forgive my blindness ;-)

On 04-06-2009 17:10, laurent Goubet wrote:
> Hi Patrick,
>
> I'll simply quote the javadoc :
>
> MatchService.doMatch : "Matches two models and returns the corresponding
> matching model."
>
> => what is meant here is : regardless of the EObjects passed as
> arguments, we'll compare their containing resources.
>
> MatchService.doContentMatch : "Matches two objects along with their
> content, then return the corresponding match model."
>
> => this is what you seek to do.
>
> Laurent Goubet
> Obeo
>
> Patrick Könemann a écrit :
>> Cheers,
>>
>> I wonder if it is at all possible to compare just two in-memory models
>> with EMF Compare?
>> Regarding the API, it should be, since MatchService.doMatch takes
>> EObjects and not Resources.
>> However, the match engine uses the resources (which are not set in the
>> example below) to perform the comparison.
>>
>> My use case is a comparison of partial models, i.e. the compared
>> EObjects are contained in another, larger model.
>> For example, two sub-packages in a UML model.
>>
>> Any suggestions and comments are appreciated.
>> Patrick
>>
>>
>>
>> // this creates two simple EObjects for comparison, but a NullPointer
>> is raised because the resources are not set
>> MatchService.doMatch(createDynamicObject("a"),
>> createDynamicObject("b"), Collections.<String, Object> emptyMap());
>>
>> /** Just to create a simple EObject just having a name. */
>> private EObject createDynamicObject(String name) {
>> // create the wrapper containment reference
>> final EAttribute attr = EcoreFactory.eINSTANCE.createEAttribute();
>> attr.setName("name");
>> attr.setEType(EcorePackage.Literals.ESTRING);
>>
>> // create the wrapper class
>> final EClass namedClass = EcoreFactory.eINSTANCE.createEClass();
>> namedClass.setName("DynamicNamedElement");
>> namedClass.getEStructuralFeatures().add(attr);
>>
>> // create a package for our wrapper class
>> final EPackage simplePackage = EcoreFactory.eINSTANCE.createEPackage();
>> simplePackage.setName("dynamic");
>> simplePackage.setNsPrefix("dynamic");
>> simplePackage.setNsURI("http://www.example.org/dynamic");
>> simplePackage.getEClassifiers().add(namedClass);
>>
>> // validate what we just created
>> if (Diagnostician.INSTANCE.validate(simplePackage).getCode() ==
>> Diagnostic.OK) {
>> // instantiate our class, fill the children and return it
>> final EObject namedClassInstance =
>> simplePackage.getEFactoryInstance().create(namedClass);
>> namedClassInstance.eSet(attr, name);
>> return namedClassInstance;
>> } else {
>> return null; // TODO: better error handling required here
>> }
>> }
>

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Re: [EMF Compare] Comparing models without resources [message #137052 is a reply to message #136991]

Tue, 09 June 2009 16:17

Laurent Goubet

Messages: 1902
Registered: July 2009

Senior Member

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Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Content-Transfer-Encoding: 8bit

Patrick,

Or the javadoc needs to be rewrote with a little less copy/pasting so
that people know it does contain interesting things to read :D.

Laurent Goubet
Obeo

Patrick K

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