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#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;
using Google.Protobuf.Reflection;
namespace Google.Protobuf
{
// TODO(jonskeet): Do we want a "weak" (non-generic) version of IReflectedMessage?
// TODO(jonskeet): Split these interfaces into separate files when we're happy with them.
/// <summary>
/// Reflection support for accessing field values.
/// </summary>
public interface IReflectedMessage : IMessage
{
FieldAccessorTable Fields { get; }
// TODO(jonskeet): Descriptor? Or a single property which has "all you need for reflection"?
}
/// <summary>
/// Interface for a Protocol Buffers message, supporting
/// basic operations required for serialization.
/// </summary>
public interface IMessage
{
/// <summary>
/// Merges the data from the specified coded input stream with the current message.
/// </summary>
/// <remarks>See the user guide for precise merge semantics.</remarks>
/// <param name="input"></param>
void MergeFrom(CodedInputStream input);
/// <summary>
/// Writes the data to the given coded output stream.
/// </summary>
/// <param name="output">Coded output stream to write the data to. Must not be null.</param>
void WriteTo(CodedOutputStream output);
/// <summary>
/// Calculates the size of this message in Protocol Buffer wire format, in bytes.
/// </summary>
/// <returns>The number of bytes required to write this message
/// to a coded output stream.</returns>
int CalculateSize();
}
/// <summary>
/// Generic interface for a Protocol Buffers message,
/// where the type parameter is expected to be the same type as
/// the implementation class.
/// </summary>
/// <typeparam name="T">The message type.</typeparam>
public interface IMessage<T> : IReflectedMessage, IEquatable<T>, IDeepCloneable<T>, IFreezable where T : IMessage<T>
{
/// <summary>
/// Merges the given message into this one.
/// </summary>
/// <remarks>See the user guide for precise merge semantics.</remarks>
/// <param name="message">The message to merge with this one. Must not be null.</param>
void MergeFrom(T message);
}
/// <summary>
/// Generic interface for a deeply cloneable type.
/// <summary>
/// <remarks>
/// All generated messages implement this interface, but so do some non-message types.
/// Additionally, due to the type constraint on <c>T</c> in <see cref="IMessage{T}"/>,
/// it is simpler to keep this as a separate interface.
/// </para>
/// <para>
/// Freezable types which implement this interface should always return a mutable clone,
/// even if the original object is frozen.
/// </para>
/// </remarks>
/// <typeparam name="T">The type itself, returned by the <see cref="Clone"/> method.</typeparam>
public interface IDeepCloneable<T>
{
/// <summary>
/// Creates a deep clone of this object.
/// </summary>
/// <returns>A deep clone of this object.</returns>
T Clone();
}
/// <summary>
/// Provides a mechanism for freezing a message (or repeated field collection)
/// to make it immutable.
/// </summary>
/// <remarks>
/// Implementations are under no obligation to make this thread-safe: if a freezable
/// type instance is shared between threads before being frozen, and one thread then
/// freezes it, it is possible for other threads to make changes during the freezing
/// operation and also to observe stale values for mutated fields. Objects should be
/// frozen before being made available to other threads.
/// </remarks>
public interface IFreezable
{
/// <summary>
/// Freezes this object.
/// </summary>
/// <remarks>
/// If the object is already frozen, this method has no effect.
/// </remarks>
void Freeze();
/// <summary>
/// Returns whether or not this object is frozen (and therefore immutable).
/// </summary>
/// <value><c>true</c> if this object is frozen; <c>false</c> otherwise.</value>
bool IsFrozen { get; }
}
}
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