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EMF Compare/User Guide


EMF Compare
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Getting Started

Installing EMF Compare

Marketplace Client

Using the bundled Eclipse marketplace client you can install EMF Compare in one click. Just type "emf compare", click on search, and then on install.


Marketplace.png

Update Site

EMF has been part of the Eclipse release train since Galileo, you can install it using the following update sites, depending on your platform. Note that the following are not meant to be visited in your internet browser; they must be pasted in the Help > Install New Software dialog of your Eclipse, as p2 repositories.

 http://download.eclipse.org/releases/galileo
 http://download.eclipse.org/releases/helios
 http://download.eclipse.org/releases/indigo
 http://download.eclipse.org/releases/juno

Please note that the EMF Compare development team does its best to maintain downward compatibility towards Galileo (Eclipse 3.5). Following is the compatibility chart :

EMF Compare Eclipse 3.2 - EMF 2.2 Eclipse 3.3 - EMF 2.3 Eclipse 3.4 - EMF 2.4 Eclipse 3.5 - EMF 2.5 Eclipse 3.6 - EMF 2.6 Eclipse 3.7 - EMF 2.7 Eclipse 3.8 - EMF 2.8
0.7 OK
0.8 KO OK OK
1.0 KO OK OK OK OK
1.1 KO KO OK OK OK OK OK
1.2 KO KO OK OK OK OK OK
1.3 KO KO KO OK OK OK OK
2.0 KO KO KO OK OK OK OK

An empty cell indicates that the compatibility hasn't been tested for a particular combination.

Usage

Once installed, you can compare your files (locally or from any Version Control System) as usual using the compare with menu.

EMFC Compare With.png

Sample Use Case

For this test, we'll suppose that you are trying to use EMF Compare on UML models shared under git. This will not go in details about UML and Git. We'll assume that you know how to manipulate an UML model, create or clone a git repository, share a project under it and use standard Git operations.

The name of our sample project will be "library". It contains a single folder "model" containing two models :

  • library_Types.uml will contain our primitive types,
  • library.uml will contain our actual model.

The two models will be commited to our git clone. The whole thing looks like this :

EMF Compare Use Setup.png

The model itself is a very simple library. Graphically speaking :

EMF Compare Use Model.png

Now that this initial model file has been committed, we'd like to improve it a little. For example :

  • Add an alias property to the Writer class,
  • Add a new History Category,
  • Rename the pages property of Book into length.

Our model now looks like this :

EMF Compare Use Model Changed.png

User Interface

The main points of interest are highlighted in the following picture :

EMF Compare's basic user interface
  1. Overview of the differences detected between the given two (or three) models.
  2. First version of the compared models.
  3. Second version of the compared models.
  4. This button will only be visible in the case of three-way comparisons (for example, comparing with a remote repository). It will make a third version of the compared model (the common ancestor of the two others) visible in the interface.
  5. This button will allow you to group differences together in the structural view. For example, grouping all "Additions" or "Deletions" together.
  6. This button will allow you to filter some differences out of the view according to a set predicate. For example, filtering out all "Additions" or "Moves".
  7. Allows you to merge all non conflicting differences (left to right, or right to left) at once.
  8. Allows you to merge the single, currently selected difference in a given direction (left to right, or right to left).
  9. Allows you to navigate through the detected differences.

Features

Handling Conflicts

PENDING

Grouping Differences

This feature allows you to group differences together in the structural view according to a set predicate. By default, EMF Compare provides three distinct grouping strategies : EMF Compare Groups Choice.png

Default 
Do not try and group differences together, display them as they were detected.

EMF Compare Groups Default.png

By Kind 
Group differences by their kind (additions, deletions, moves, changes).

EMF Compare Groups Kind.png

By Metaclass 
Group difference according to the metaclass of the object on which they were detected.

EMF Compare Groups Metaclass.png

PENDING UPDATE, this is a demo displaying EMF Compare 1.3 Demo

PENDING : New grouping strategies can be provided to EMF Compare through extension points.

Filtering Differences

This features allows you to filter differences out of the structural view according to a set predicate. By default, EMF Compare provides five distinct filters : EMF Compare Filters Choice.png

Changed Elements 
Filter out all differences of type CHANGE. Disabled by default.
Added Elements 
Filter out all differences of type ADD. Disabled by default.
Removed Elements 
Filter out all differences of type DELETE. Disabled by default.
Moved Elements 
Filter out all differences of type CHANGE. Disabled by default.
Resource Mappings 
Filter out all resource mappings from the view. Enabled by default.

PENDING UPDATE, this is a demo displaying EMF Compare 1.3 Demo

PENDING : New filters can be provided to EMF Compare through extension points.

Text Attribute Comparison

Differences made into String-typed attributes can be compared and merged directly as text from the compare interface through a simple right-click on the difference.

EMF Compare Text Compare.png

PENDING UPDATE, this demo displays EMF Compare 1.3 Demo

Graphical Comparison

PENDING UPDATE

Since the 1.2 release EMF compare provides the ability to compare models with graphical modelers.

Have a look on the following demos :

[Demo : Comparing Ecore files with diagrams]

[Demo : Comparing UML files with diagrams]

Diag comp diff.png

Logical Model

EMF Compare does not act simply on the selected files, but on their whole logical model (a given model can be split through multiple files through EMF control action). Thanks to that, if you try and compare a model file that reference other model files, the comparison will still be able to take these "other" files into account. For example, if you try and compare a genmodel file (that depends on its underlying ecore file) :

EMF Compare Logical Compare Action.png

EMF Compare will actually consider both files when comparing :

EMF Compare Logical Compare Result.png

PENDING UPDATE Demo

UML Specialization

PENDING

[Demo : Specific support to encapsulate profiles and stereotypes diffs]

Other Materials