Famix-Simple-Diff

Simple implementation to compare two models and return whether they are identical or not. The tool also provides a list of differences that you can find between models.

Baseline

Metacello new
  baseline: 'FamixSimpleDiff';
  repository: 'github://moosetechnology/Famix-Simple-Diff:main/src';
  load

How to use Famix-Simple-Diff

model1 := '/path/to/my/original_model.json' asFileReference readStreamDo: [ :st | FamixJavaModel new importFromJSONStream: st ].
model2 := '/path/to/my/modified_model.json' asFileReference readStreamDo: [ :st | FamixJavaModel new importFromJSONStream: st ].

diff := FamixSimpleDiff new.

"Run the comparison"
diff compareModel: model1 to: model2.

" Gives the differences between models"
diff differences.

How does it work

The tool will traverse all the entities of the model and use the Moose meta-description and a worklist algorithm to compare their types, properties, and relations. All comparisons are made from the perspective of the second model, which is the target of the changes.

You have 5 possible differences:

• FSDEntityAddition: An entity has been added to the target model.
• FSDEntityDeletion: An entity has been removed from the target model.
• FSDEntityChanged: An entity changed between the models.
• FSDPropertyChanged: A property of an entity has been modified.
• FSDRelationChanged: A relation to another entity has been modified.

For all these types of changes, the difference object contains the value that was expected and the value that we got.