csharp-sdk-upm/Libs/Google.Protobuf/Extension.cs

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2021-03-29 14:54:12 +08:00
#region Copyright notice and license
// Protocol Buffers - Google's data interchange format
// Copyright 2008 Google Inc. All rights reserved.
// https://developers.google.com/protocol-buffers/
//
// 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;
namespace LC.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.DefaultValue;
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);
}
}
}