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Session session = new EObjectQuery(object).getSession();

Session session = ...
if (!session.isOpen()) {
  session.open(new NullProgressMonitor());
}
Collection<DRepresentation> allRepresentations = DialectManager.INSTANCE.getAllRepresentations(session);

IFile airdFile = ...
Session session = SessionManager.INSTANCE.getSession(EcoreUtil2.getURI(airdFile), new NullProgressMonitor());