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// Protocol Buffers - Google's data interchange format
// Copyright 2008 Google Inc.
// http://code.google.com/p/protobuf/
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
using System;
using Google.ProtocolBuffers.Descriptors;
namespace Google.ProtocolBuffers.FieldAccess {
/// <summary>
/// Accessor for fields representing a non-repeated enum value.
/// </summary>
internal sealed class SingleEnumAccessor : SinglePrimitiveAccessor {
private readonly EnumDescriptor enumDescriptor;
internal SingleEnumAccessor(FieldDescriptor field, string name, Type messageType, Type builderType)
: base(name, messageType, builderType) {
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(IMessage 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(IBuilder builder, object value) {
EnumValueDescriptor valueDescriptor = (EnumValueDescriptor) value;
base.SetValue(builder, valueDescriptor.Number);
}
}
}
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