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// Protocol Buffers - Google's data interchange format
// Copyright 2008 Google Inc. All rights reserved.
// http://github.com/jskeet/dotnet-protobufs/
// Original C++/Java/Python code:
// http://code.google.com/p/protobuf/
//
// 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.
using Google.ProtocolBuffers.Descriptors;
namespace Google.ProtocolBuffers.FieldAccess
{
/// <summary>
/// Accessor for fields representing a non-repeated enum value.
/// </summary>
internal sealed class SingleEnumAccessor<TMessage, TBuilder> : SinglePrimitiveAccessor<TMessage, TBuilder>
where TMessage : IMessage<TMessage, TBuilder>
where TBuilder : IBuilder<TMessage, TBuilder>
{
private readonly EnumDescriptor enumDescriptor;
internal SingleEnumAccessor(FieldDescriptor field, string name) : base(name)
{
enumDescriptor = field.EnumType;
}
/// <summary>
/// Returns an EnumValueDescriptor representing the value in the builder.
/// Note that if an enum has multiple values for the same number, the descriptor
/// for the first value with that number will be returned.
/// </summary>
public override object GetValue(TMessage message)
{
// Note: This relies on the fact that the CLR allows unboxing from an enum to
// its underlying value
int rawValue = (int) base.GetValue(message);
return enumDescriptor.FindValueByNumber(rawValue);
}
/// <summary>
/// Sets the value as an enum (via an int) in the builder,
/// from an EnumValueDescriptor parameter.
/// </summary>
public override void SetValue(TBuilder builder, object value)
{
ThrowHelper.ThrowIfNull(value, "value");
EnumValueDescriptor valueDescriptor = (EnumValueDescriptor) value;
base.SetValue(builder, valueDescriptor.Number);
}
}
}
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