1 files changed, 66 insertions, 0 deletions
diff --git a/csharp/src/Google.Protobuf/Reflection/GeneratedCodeInfo.cs b/csharp/src/Google.Protobuf/Reflection/GeneratedCodeInfo.cs
new file mode 100644
index 00000000..8c52cd12
--- /dev/null
+++ b/csharp/src/Google.Protobuf/Reflection/GeneratedCodeInfo.cs
@@ -0,0 +1,66 @@
+using System;
+
+namespace Google.Protobuf.Reflection
+{
+    /// <summary>
+    /// Extra information provided by generated code when initializing a message or file descriptor.
+    /// These are constructed as required, and are not long-lived. Hand-written code should
+    /// never need to use this type.
+    /// </summary>
+    public sealed class GeneratedCodeInfo
+    {
+        private static readonly string[] EmptyNames = new string[0];
+        private static readonly GeneratedCodeInfo[] EmptyCodeInfo = new GeneratedCodeInfo[0];
+
+        /// <summary>
+        /// Irrelevant for file descriptors; the CLR type for the message for message descriptors.
+        /// </summary>
+        public Type ClrType { get; private set; }
+
+        /// <summary>
+        /// Irrelevant for file descriptors; the CLR property names (in message descriptor field order)
+        /// for fields in the message for message descriptors.
+        /// </summary>
+        public string[] PropertyNames { get; private set; }
+
+        /// <summary>
+        /// Irrelevant for file descriptors; the CLR property "base" names (in message descriptor oneof order)
+        /// for oneofs in the message for message descriptors. It is expected that for a oneof name of "Foo",
+        /// there will be a "FooCase" property and a "ClearFoo" method.
+        /// </summary>
+        public string[] OneofNames { get; private set; }
+
+        /// <summary>
+        /// The reflection information for types within this file/message descriptor. Elements may be null
+        /// if there is no corresponding generated type, e.g. for map entry types.
+        /// </summary>
+        public GeneratedCodeInfo[] NestedTypes { get; private set; }
+
+        /// <summary>
+        /// The CLR types for enums within this file/message descriptor.
+        /// </summary>
+        public Type[] NestedEnums { get; private set; }
+
+        /// <summary>
+        /// Creates a GeneratedCodeInfo for a message descriptor, with nested types, nested enums, the CLR type, property names and oneof names.
+        /// Each array parameter may be null, to indicate a lack of values.
+        /// The parameter order is designed to make it feasible to format the generated code readably.
+        /// </summary>
+        public GeneratedCodeInfo(Type clrType, string[] propertyNames, string[] oneofNames, Type[] nestedEnums, GeneratedCodeInfo[] nestedTypes)
+        {
+            NestedTypes = nestedTypes ?? EmptyCodeInfo;
+            NestedEnums = nestedEnums ?? ReflectionUtil.EmptyTypes;
+            ClrType = clrType;
+            PropertyNames = propertyNames ?? EmptyNames;
+            OneofNames = oneofNames ?? EmptyNames;
+        }
+
+        /// <summary>
+        /// Creates a GeneratedCodeInfo for a file descriptor, with only types and enums.
+        /// </summary>
+        public GeneratedCodeInfo(Type[] nestedEnums, GeneratedCodeInfo[] nestedTypes)
+            : this(null, null, null, nestedEnums, nestedTypes)
+        {
+        }
+    }
+}
+\ No newline at end of file