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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;
using System.Collections;
namespace Google.Protobuf.Reflection
{
/// <summary>
/// Allows fields to be reflectively accessed.
/// </summary>
public interface IFieldAccessor
{
/// <summary>
/// Returns the descriptor associated with this field.
/// </summary>
FieldDescriptor Descriptor { get; }
/// <summary>
/// Clears the field in the specified message. (For repeated fields,
/// this clears the list.)
/// </summary>
void Clear(IMessage message);
/// <summary>
/// Fetches the field value. For repeated values, this will be an
/// <see cref="IList"/> implementation. For map values, this will be an
/// <see cref="IDictionary"/> implementation.
/// </summary>
object GetValue(IMessage message);
/// <summary>
/// Indicates whether the field in the specified message is set.
/// For proto3 fields that aren't explicitly optional, this throws an <see cref="InvalidOperationException"/>
/// </summary>
bool HasValue(IMessage message);
/// <summary>
/// Mutator for single "simple" fields only.
/// </summary>
/// <remarks>
/// Repeated fields are mutated by fetching the value and manipulating it as a list.
/// Map fields are mutated by fetching the value and manipulating it as a dictionary.
/// </remarks>
/// <exception cref="InvalidOperationException">The field is not a "simple" field.</exception>
void SetValue(IMessage message, object value);
}
}