class DatabaseCommunicator {
    DatabaseCommunicator(Database db) {
        this.db = db;
    }
    private Database db;
    Response sendQuery(Query q) {
        DatabaseQuery dbq = convertQuery(q);
        DatabaseResponse response = db.sendQuery(dbq);
        return convertResponse(response);
    }
    DatabaseQuery convertQuery(Query q){...}
    Response convertResponse(DatabaseResponse r){...}
}