Question

Let’s say I have Person EMF Model. I create 2 instances of this model bob.person and mike.person. Is there way to create a collection of all models in my workspace that are Person and query them using OCL or EMF Query?

Answer 1

Yes, definitely.

First, to create a collection of all models of some type in workspace use Eclipse Resources API.

IResourceVisitor 

will come handy, searching for files with specific extensions, and putting them into collection. They can be loaded into a resource set with:

ResourceSet personSet = new ResourceSetImpl();
for (IResource res : foundIResources) {
  personSet.getResource(URI.createFileUTI(res.getFullPath(), true);
} 

Next, you should execute a Query against a result set. You can either collect all the root elements of a resource set with:

Set<EObject> roots = new HashSet<EObject>;
for (Resource res : personSet.getResources()) {
  roots.addAll(res.getContent());
}

or create a

IEObjectSource

with similar functionality, to use with FROM EMF Model Query statement.