private static void ParseSubHierarchy(INode parent, ClassHierarchyProto.Node n)
        {
            INode parsed;

            if (n.package_node != null)
            {
                parsed = new PackageNodeImpl(parent, n.name, n.full_name);
            }
            else if (n.named_parameter_node != null)
            {
                ClassHierarchyProto.NamedParameterNode np = n.named_parameter_node;
                parsed = new NamedParameterNodeImpl(parent, n.name,
                                                    n.full_name, np.full_arg_class_name, np.simple_arg_class_name,
                                                    np.is_set, np.documentation, np.short_name,
                                                    np.instance_default.ToArray());
            }
            else if (n.class_node != null)
            {
                ClassHierarchyProto.ClassNode cn = n.class_node;
                IList <IConstructorDef>       injectableConstructors = new List <IConstructorDef>();
                IList <IConstructorDef>       allConstructors        = new List <IConstructorDef>();

                foreach (ClassHierarchyProto.ConstructorDef injectable in cn.InjectableConstructors)
                {
                    IConstructorDef def = ParseConstructorDef(injectable, true);
                    injectableConstructors.Add(def);
                    allConstructors.Add(def);
                }
                foreach (ClassHierarchyProto.ConstructorDef other in cn.OtherConstructors)
                {
                    IConstructorDef def = ParseConstructorDef(other, false);
                    allConstructors.Add(def);
                }

                IConstructorDef[] dummy = new ConstructorDefImpl[0];
                parsed = new ClassNodeImpl(parent, n.name, n.full_name,
                                           cn.is_unit, cn.is_injection_candidate,
                                           cn.is_external_constructor, injectableConstructors,
                                           allConstructors, cn.default_implementation);
            }

            else
            {
                throw new IllegalStateException("Bad protocol buffer: got abstract node" + n);
            }

            foreach (ClassHierarchyProto.Node child in n.children)
            {
                ParseSubHierarchy(parsed, child);
            }
        }
        private static void ParseSubHierarchy(INode parent, Org.Apache.REEF.Tang.Protobuf.Node n)
        {
            INode parsed = null;

            if (n.package_node != null)
            {
                parsed = new PackageNodeImpl(parent, n.name, n.full_name);
            }
            else if (n.named_parameter_node != null)
            {
                Org.Apache.REEF.Tang.Protobuf.NamedParameterNode np = n.named_parameter_node;

                if (!string.IsNullOrWhiteSpace(np.alias_name) && !string.IsNullOrWhiteSpace(np.alias_language))
                {
                    Language language;
                    try
                    {
                        Enum.TryParse(np.alias_language, true, out language);
                    }
                    catch (Exception)
                    {
                        string msg = string.Format(CultureInfo.CurrentCulture, "Language {0} passed in is not supported", np.alias_language);
                        throw new ArgumentException(msg);
                    }

                    parsed = new NamedParameterNodeImpl(parent, n.name,
                                                        n.full_name, np.full_arg_class_name, np.simple_arg_class_name,
                                                        np.is_set, np.is_list, np.documentation, np.short_name,
                                                        np.instance_default.ToArray(), np.alias_name, language);
                }
                else
                {
                    parsed = new NamedParameterNodeImpl(parent, n.name,
                                                        n.full_name, np.full_arg_class_name, np.simple_arg_class_name,
                                                        np.is_set, np.is_list, np.documentation, np.short_name,
                                                        np.instance_default.ToArray());
                }
            }
            else if (n.class_node != null)
            {
                Org.Apache.REEF.Tang.Protobuf.ClassNode cn     = n.class_node;
                IList <IConstructorDef> injectableConstructors = new List <IConstructorDef>();
                IList <IConstructorDef> allConstructors        = new List <IConstructorDef>();

                foreach (Org.Apache.REEF.Tang.Protobuf.ConstructorDef injectable in cn.InjectableConstructors)
                {
                    IConstructorDef def = ParseConstructorDef(injectable, true);
                    injectableConstructors.Add(def);
                    allConstructors.Add(def);
                }
                foreach (Org.Apache.REEF.Tang.Protobuf.ConstructorDef other in cn.OtherConstructors)
                {
                    IConstructorDef def = ParseConstructorDef(other, false);
                    allConstructors.Add(def);
                }

                IConstructorDef[] dummy = new ConstructorDefImpl[0];
                parsed = new ClassNodeImpl(parent, n.name, n.full_name,
                                           cn.is_unit, cn.is_injection_candidate,
                                           cn.is_external_constructor, injectableConstructors,
                                           allConstructors, cn.default_implementation);
            }
            else
            {
                Org.Apache.REEF.Utilities.Diagnostics.Exceptions.Throw(new IllegalStateException("Bad protocol buffer: got abstract node" + n), LOGGER);
            }

            foreach (Org.Apache.REEF.Tang.Protobuf.Node child in n.children)
            {
                ParseSubHierarchy(parsed, child);
            }
        }