// Protocol Buffers - Google's data interchange format
// Copyright 2008 Google Inc.
// http://code.google.com/p/protobuf/
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//      http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
using System;
using Google.ProtocolBuffers.Descriptors;

namespace Google.ProtocolBuffers {

  /// <summary>
  /// Generated extension for a singular field.
  /// </remarks>
  public sealed class GeneratedSingleExtension<TExtension> : GeneratedExtensionBase<TExtension>  {
    internal GeneratedSingleExtension(FieldDescriptor descriptor) : base(descriptor, typeof(TExtension)) {
    }

    public static GeneratedSingleExtension<TExtension> CreateInstance(FieldDescriptor descriptor) {
      if (descriptor.IsRepeated) {
        throw new ArgumentException("Must call GeneratedRepeateExtension.CreateInstance() for repeated types.");
      }
      return new GeneratedSingleExtension<TExtension>(descriptor);
    }

    public override object FromReflectionType(object value) {
      return base.SingularFromReflectionType(value);
    }
  }
}