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#region Copyright notice and license
// Protocol Buffers - Google's data interchange format
// Copyright 2008 Google Inc. All rights reserved.
//
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file or at
// https://developers.google.com/open-source/licenses/bsd
#endregion
using System;
namespace Google.Protobuf
{
/// <summary>
/// Represents a non-generic extension definition. This API is experimental and subject to change.
/// </summary>
public abstract class Extension
{
internal abstract Type TargetType { get; }
/// <summary>
/// Internal use. Creates a new extension with the specified field number.
/// </summary>
protected Extension(int fieldNumber)
{
FieldNumber = fieldNumber;
}
internal abstract IExtensionValue CreateValue();
/// <summary>
/// Gets the field number of this extension
/// </summary>
public int FieldNumber { get; }
internal abstract bool IsRepeated { get; }
}
/// <summary>
/// Represents a type-safe extension identifier used for getting and setting single extension values in <see cref="IExtendableMessage{T}"/> instances.
/// This API is experimental and subject to change.
/// </summary>
/// <typeparam name="TTarget">The message type this field applies to</typeparam>
/// <typeparam name="TValue">The field value type of this extension</typeparam>
public sealed class Extension<TTarget, TValue> : Extension where TTarget : IExtendableMessage<TTarget>
{
private readonly FieldCodec<TValue> codec;
/// <summary>
/// Creates a new extension identifier with the specified field number and codec
/// </summary>
public Extension(int fieldNumber, FieldCodec<TValue> codec) : base(fieldNumber)
{
this.codec = codec;
}
internal TValue DefaultValue => codec != null ? codec.DefaultValue : default;
internal override Type TargetType => typeof(TTarget);
internal override bool IsRepeated => false;
internal override IExtensionValue CreateValue()
{
return new ExtensionValue<TValue>(codec);
}
}
/// <summary>
/// Represents a type-safe extension identifier used for getting repeated extension values in <see cref="IExtendableMessage{T}"/> instances.
/// This API is experimental and subject to change.
/// </summary>
/// <typeparam name="TTarget">The message type this field applies to</typeparam>
/// <typeparam name="TValue">The repeated field value type of this extension</typeparam>
public sealed class RepeatedExtension<TTarget, TValue> : Extension where TTarget : IExtendableMessage<TTarget>
{
private readonly FieldCodec<TValue> codec;
/// <summary>
/// Creates a new repeated extension identifier with the specified field number and codec
/// </summary>
public RepeatedExtension(int fieldNumber, FieldCodec<TValue> codec) : base(fieldNumber)
{
this.codec = codec;
}
internal override Type TargetType => typeof(TTarget);
internal override bool IsRepeated => true;
internal override IExtensionValue CreateValue()
{
return new RepeatedExtensionValue<TValue>(codec);
}
}
}