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#region Copyright notice and license
// Protocol Buffers - Google's data interchange format
// Copyright 2015 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 Google.Protobuf.Collections;
namespace Google.Protobuf
{
/// <summary>
/// Generic interface for a Protocol Buffers message containing one or more extensions, where the type parameter is expected to be the same type as the implementation class.
/// This interface is experiemental and is subject to change.
/// </summary>
public interface IExtendableMessage<T> : IMessage<T> where T : IExtendableMessage<T>
{
/// <summary>
/// Gets the value of the specified extension
/// </summary>
TValue GetExtension<TValue>(Extension<T, TValue> extension);
/// <summary>
/// Gets the value of the specified repeated extension or null if the extension isn't registered in this set.
/// For a version of this method that never returns null, use <see cref="IExtendableMessage{T}.GetOrInitializeExtension{TValue}(RepeatedExtension{T, TValue})"/>
/// </summary>
RepeatedField<TValue> GetExtension<TValue>(RepeatedExtension<T, TValue> extension);
/// <summary>
/// Gets the value of the specified repeated extension, registering it if it hasn't already been registered.
/// </summary>
RepeatedField<TValue> GetOrInitializeExtension<TValue>(RepeatedExtension<T, TValue> extension);
/// <summary>
/// Sets the value of the specified extension
/// </summary>
void SetExtension<TValue>(Extension<T, TValue> extension, TValue value);
/// <summary>
/// Gets whether the value of the specified extension is set
/// </summary>
bool HasExtension<TValue>(Extension<T, TValue> extension);
/// <summary>
/// Clears the value of the specified extension
/// </summary>
void ClearExtension<TValue>(Extension<T, TValue> extension);
/// <summary>
/// Clears the value of the specified repeated extension
/// </summary>
void ClearExtension<TValue>(RepeatedExtension<T, TValue> extension);
}
}