/src/ProtoGen/ExtensionGenerator.cs

#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 Google.ProtocolBuffers.Descriptors;



namespace Google.ProtocolBuffers.ProtoGen

{

    internal class ExtensionGenerator : FieldGeneratorBase, ISourceGenerator

    {

        private readonly string extends;

        private readonly string scope;

        private readonly string type;

        private readonly string name;



        internal ExtensionGenerator(FieldDescriptor descriptor)

            : base(descriptor, 0)

        {

            if (Descriptor.ExtensionScope != null)

            {

                scope = GetClassName(Descriptor.ExtensionScope);

            }

            else

            {

                scope = DescriptorUtil.GetFullUmbrellaClassName(Descriptor.File);

            }

            switch (Descriptor.MappedType)

            {

                case MappedType.Message:

                    type = GetClassName(Descriptor.MessageType);

                    break;

                case MappedType.Enum:

                    type = GetClassName(Descriptor.EnumType);

                    break;

                default:

                    type = DescriptorUtil.GetMappedTypeName(Descriptor.MappedType);

                    break;

            }

            extends = GetClassName(Descriptor.ContainingType);

            name = Descriptor.CSharpOptions.PropertyName;

        }



        public void Generate(TextGenerator writer)

        {

            if (Descriptor.File.CSharpOptions.ClsCompliance && GetFieldConstantName(Descriptor).StartsWith("_"))

            {

                writer.WriteLine("[global::System.CLSCompliant(false)]");

            }



            writer.WriteLine("public const int {0} = {1};", GetFieldConstantName(Descriptor), Descriptor.FieldNumber);



            if (UseLiteRuntime)

            {

                if (Descriptor.MappedType == MappedType.Message && Descriptor.MessageType.Options.MessageSetWireFormat)

                {

                    throw new ArgumentException(

                        "option message_set_wire_format = true; is not supported in Lite runtime extensions.");

                }

                if (!Descriptor.IsCLSCompliant && Descriptor.File.CSharpOptions.ClsCompliance)

                {

                    writer.WriteLine("[global::System.CLSCompliant(false)]");

                }

                writer.WriteLine("{0} static pb::{4}<{1}, {2}> {3};", ClassAccessLevel, extends, type, name,

                                 Descriptor.IsRepeated ? "GeneratedRepeatExtensionLite" : "GeneratedExtensionLite");

            }

            else if (Descriptor.IsRepeated)

            {

                if (!Descriptor.IsCLSCompliant && Descriptor.File.CSharpOptions.ClsCompliance)

                {

                    writer.WriteLine("[global::System.CLSCompliant(false)]");

                }

                writer.WriteLine("{0} static pb::GeneratedExtensionBase<scg::IList<{1}>> {2};", ClassAccessLevel, type,

                                 name);

            }

            else

            {

                if (!Descriptor.IsCLSCompliant && Descriptor.File.CSharpOptions.ClsCompliance)

                {

                    writer.WriteLine("[global::System.CLSCompliant(false)]");

                }

                writer.WriteLine("{0} static pb::GeneratedExtensionBase<{1}> {2};", ClassAccessLevel, type, name);

            }

        }



        internal void GenerateStaticVariableInitializers(TextGenerator writer)

        {

            if (UseLiteRuntime)

            {

                writer.WriteLine("{0}.{1} = ", scope, name);

                writer.Indent();

                writer.WriteLine("new pb::{0}<{1}, {2}>(",

                                 Descriptor.IsRepeated ? "GeneratedRepeatExtensionLite" : "GeneratedExtensionLite",

                                 extends, type);

                writer.Indent();

                writer.WriteLine("\"{0}\",", Descriptor.FullName);

                writer.WriteLine("{0}.DefaultInstance,", extends);

                if (!Descriptor.IsRepeated)

                {

                    writer.WriteLine("{0},",

                                     Descriptor.HasDefaultValue

                                         ? DefaultValue

                                         : IsNullableType ? "null" : "default(" + type + ")");

                }

                writer.WriteLine("{0},",

                                 (Descriptor.MappedType == MappedType.Message) ? type + ".DefaultInstance" : "null");

                writer.WriteLine("{0},",

                                 (Descriptor.MappedType == MappedType.Enum) ? "new EnumLiteMap<" + type + ">()" : "null");

                writer.WriteLine("{0}.{1}FieldNumber,", scope, name);

                writer.Write("pbd::FieldType.{0}", Descriptor.FieldType);

                if (Descriptor.IsRepeated)

                {

                    writer.WriteLine(",");

                    writer.Write(Descriptor.IsPacked ? "true" : "false");

                }

                writer.Outdent();

                writer.WriteLine(");");

                writer.Outdent();

            }

            else if (Descriptor.IsRepeated)

            {

                writer.WriteLine(

                    "{0}.{1} = pb::GeneratedRepeatExtension<{2}>.CreateInstance({0}.Descriptor.Extensions[{3}]);", scope,

                    name, type, Descriptor.Index);

            }

            else

            {

                writer.WriteLine(

                    "{0}.{1} = pb::GeneratedSingleExtension<{2}>.CreateInstance({0}.Descriptor.Extensions[{3}]);", scope,

                    name, type, Descriptor.Index);

            }

        }



        internal void GenerateExtensionRegistrationCode(TextGenerator writer)

        {

            writer.WriteLine("registry.Add({0}.{1});", scope, name);

        }



        public override void WriteHash(TextGenerator writer)

        {

        }



        public override void WriteEquals(TextGenerator writer)

        {

        }



        public override void WriteToString(TextGenerator writer)

        {

        }

    }

}