1 files changed, 92 insertions, 0 deletions
diff --git a/csharp/ProtoGen/MessageFieldGenerator.cs b/csharp/ProtoGen/MessageFieldGenerator.cs
new file mode 100644
index 00000000..c73edfc0
--- /dev/null
+++ b/csharp/ProtoGen/MessageFieldGenerator.cs
@@ -0,0 +1,92 @@
+using Google.ProtocolBuffers.Descriptors;
+
+namespace Google.ProtocolBuffers.ProtoGen {
+  internal class MessageFieldGenerator : FieldGeneratorBase, IFieldSourceGenerator {
+
+    internal MessageFieldGenerator(FieldDescriptor descriptor)
+      : base(descriptor) {
+    }
+
+    public void GenerateMembers(TextGenerator writer) {
+      writer.WriteLine("private bool has{0};", CapitalizedName);
+      writer.WriteLine("private {0} {1}_ = {2};", TypeName, Name, DefaultValue);
+      writer.WriteLine("public bool Has{0} {{", CapitalizedName);
+      writer.WriteLine("  get {{ return has{0}; }}", CapitalizedName);
+      writer.WriteLine("}");
+      writer.WriteLine("public {0} {1} {{", TypeName, CapitalizedName);
+      writer.WriteLine("  get {{ return {0}_; }}", Name);
+      writer.WriteLine("}");
+    }
+    
+    public void GenerateBuilderMembers(TextGenerator writer) {
+      writer.WriteLine("public bool Has{0} {{", CapitalizedName);
+      writer.WriteLine(" get {{ return result.Has{0}; }}", CapitalizedName);
+      writer.WriteLine("}");
+      writer.WriteLine("public {0} {1} {{", TypeName, CapitalizedName);
+      writer.WriteLine("  get {{ return result.{0}; }}", CapitalizedName);
+      writer.WriteLine("  set {{ Set{0}(value); }}", CapitalizedName);
+      writer.WriteLine("}");
+      writer.WriteLine("public Builder Set{0}({1} value) {{", CapitalizedName, TypeName);
+      writer.WriteLine("  result.has{0} = true;", CapitalizedName);
+      writer.WriteLine("  result.{0}_ = value;", Name);
+      writer.WriteLine("  return this;");
+      writer.WriteLine("}");
+      writer.WriteLine("public Builder Set{0}({1}.Builder builderForValue) {{", CapitalizedName, TypeName);
+      writer.WriteLine("  result.has{0} = true;", CapitalizedName);
+      writer.WriteLine("  result.{0}_ = builderForValue.Build();", Name);
+      writer.WriteLine("  return this;");
+      writer.WriteLine("}");
+      writer.WriteLine("public Builder Merge{0}({1} value) {{", CapitalizedName, TypeName);
+      writer.WriteLine("  if (result.Has{0} &&", CapitalizedName);
+      writer.WriteLine("      result.{0}_ != {1}) {{", Name, DefaultValue);
+      writer.WriteLine("      result.{0}_ = {1}.CreateBuilder(result.{0}_).MergeFrom(value).BuildPartial();", Name, TypeName);
+      writer.WriteLine("  } else {");
+      writer.WriteLine("    result.{0}_ = value;", Name);
+      writer.WriteLine("  }");
+      writer.WriteLine("  result.has{0} = true;", CapitalizedName);
+      writer.WriteLine("  return this;");
+      writer.WriteLine("}");
+      writer.WriteLine("public Builder Clear{0}() {{", CapitalizedName);
+      writer.WriteLine("  result.has{0} = false;", CapitalizedName);
+      writer.WriteLine("  result.{0}_ = {1};", Name, DefaultValue);
+      writer.WriteLine("  return this;");
+      writer.WriteLine("}");
+    }
+
+    public void GenerateMergingCode(TextGenerator writer) {
+      writer.WriteLine("if (other.Has{0}) {{", CapitalizedName);
+      writer.WriteLine("  Merge{0}(other.{0});", CapitalizedName);
+      writer.WriteLine("}");
+    }
+
+    public void GenerateBuildingCode(TextGenerator writer) {
+      // Nothing to do for singular fields
+    }
+
+    public void GenerateParsingCode(TextGenerator writer) {
+      writer.WriteLine("{0}.Builder subBuilder = {0}.CreateBuilder();", TypeName);
+      writer.WriteLine("if (Has{0}) {{", CapitalizedName);
+      writer.WriteLine("  subBuilder.MergeFrom({0});", CapitalizedName);
+      writer.WriteLine("}");
+      if (Descriptor.FieldType == FieldType.Group) {
+        writer.WriteLine("input.ReadGroup({0}, subBuilder, extensionRegistry);", Number);
+      } else {
+        writer.WriteLine("input.ReadMessage(subBuilder, extensionRegistry);");
+      }
+      writer.WriteLine("{0} = subBuilder.BuildPartial();", CapitalizedName);
+    }
+
+    public void GenerateSerializationCode(TextGenerator writer) {
+      writer.WriteLine("if (Has{0}) {{", CapitalizedName);
+      writer.WriteLine("  output.Write{0}({1}, {2});", MessageOrGroup, Number, CapitalizedName);
+      writer.WriteLine("}");
+    }
+
+    public void GenerateSerializedSizeCode(TextGenerator writer) {
+      writer.WriteLine("if (Has{0}) {{", CapitalizedName);
+      writer.WriteLine("  size += pb::CodedOutputStream.Compute{0}Size({1}, {2});",
+          MessageOrGroup, Number, CapitalizedName);
+      writer.WriteLine("}");
+    }
+  }
+}