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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 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);
}
}