Adjust wrapper type generated mappers

plugins/commands/serve/mappers/wrappers.rb

@@ -6,30 +6,44 @@ module VagrantPlugins
       Google::Protobuf.constants.grep(/.Value$/).each do |name|
         value = Google::Protobuf.const_get(name)
         next if !value.is_a?(Class)
+        if value.instance_methods.include?(:value)
+          type = value.new.value.class
+        elsif value.instance_methods.include?(:values)
+          type = Array
+        elsif value.instance_methods.include?(:fields)
+          type = Hash
+        end
         type = value.new.respond_to?(:value) ?
           value.new.value.class :
           value.new.values.class
-        klass = Class.new(Mapper).class_eval "
+        n = type.name.to_s.split("::").last
+        Class.new(Mapper).class_eval "
           def initialize
             super(
-              inputs: [Input.new(type:#{value.name})],
+              inputs: [Input.new(type: #{value.name})],
               output: #{type.name},
               func: method(:converter)
             )
           end
 
           def self.name
-            \"#{name}\"
+            '#{name}To#{n}'
+          end
+
+          def to_s
+            '<#{name}To#{n}:' + object_id.to_s + '>'
           end
 
           def converter(proto)
-            proto.value
+            if proto.respond_to?(:value)
+              proto.value
+            elsif proto.respond_to?(:values)
+              proto.values.to_a
+            else
+              proto.fields.to_h
+            end
           end
         "
-        self.const_set(
-          name,
-          klass
-        )
       end
     end
   end