1 files changed, 87 insertions, 0 deletions
diff --git a/csharp/src/ProtoGen/SourceGenerators.cs b/csharp/src/ProtoGen/SourceGenerators.cs
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+++ b/csharp/src/ProtoGen/SourceGenerators.cs
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+#region Copyright notice and license
+
+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// http://github.com/jskeet/dotnet-protobufs/
+// Original C++/Java/Python code:
+// http://code.google.com/p/protobuf/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+#endregion
+
+using System;
+using System.Collections.Generic;
+using Google.ProtocolBuffers.Descriptors;
+
+namespace Google.ProtocolBuffers.ProtoGen
+{
+    public delegate TResult Func<T, TResult>(T arg);
+
+    internal static class SourceGenerators
+    {
+        private static readonly Dictionary<Type, Func<IDescriptor, ISourceGenerator>> GeneratorFactories =
+            new Dictionary<Type, Func<IDescriptor, ISourceGenerator>>
+                {
+                    {typeof(FileDescriptor), descriptor => new UmbrellaClassGenerator((FileDescriptor) descriptor)},
+                    {typeof(EnumDescriptor), descriptor => new EnumGenerator((EnumDescriptor) descriptor)},
+                    {typeof(ServiceDescriptor), descriptor => new ServiceGenerator((ServiceDescriptor) descriptor)},
+                    {typeof(MessageDescriptor), descriptor => new MessageGenerator((MessageDescriptor) descriptor)},
+                    // For other fields, we have IFieldSourceGenerators.
+                    {typeof(FieldDescriptor), descriptor => new ExtensionGenerator((FieldDescriptor) descriptor)}
+                };
+
+        public static IFieldSourceGenerator CreateFieldGenerator(FieldDescriptor field, int fieldOrdinal)
+        {
+            switch (field.MappedType)
+            {
+                case MappedType.Message:
+                    return field.IsRepeated
+                               ? (IFieldSourceGenerator) new RepeatedMessageFieldGenerator(field, fieldOrdinal)
+                               : new MessageFieldGenerator(field, fieldOrdinal);
+                case MappedType.Enum:
+                    return field.IsRepeated
+                               ? (IFieldSourceGenerator) new RepeatedEnumFieldGenerator(field, fieldOrdinal)
+                               : new EnumFieldGenerator(field, fieldOrdinal);
+                default:
+                    return field.IsRepeated
+                               ? (IFieldSourceGenerator) new RepeatedPrimitiveFieldGenerator(field, fieldOrdinal)
+                               : new PrimitiveFieldGenerator(field, fieldOrdinal);
+            }
+        }
+
+        public static ISourceGenerator CreateGenerator<T>(T descriptor) where T : IDescriptor
+        {
+            Func<IDescriptor, ISourceGenerator> factory;
+            if (!GeneratorFactories.TryGetValue(typeof(T), out factory))
+            {
+                throw new ArgumentException("No generator registered for " + typeof(T).Name);
+            }
+            return factory(descriptor);
+        }
+    }
+}
+\ No newline at end of file