protobuf/csharp/src/Google.Protobuf/Reflection/EnumValueDescriptor.cs

#region Copyright notice and license
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#endregion

using Google.Protobuf.Collections;
using System;

namespace Google.Protobuf.Reflection
{
    /// <summary>
    /// Descriptor for a single enum value within an enum in a .proto file.
    /// </summary>
    public sealed class EnumValueDescriptor : DescriptorBase
    {
        private readonly EnumDescriptor enumDescriptor;
        private readonly EnumValueDescriptorProto proto;

        internal EnumValueDescriptor(EnumValueDescriptorProto proto, FileDescriptor file,
                                     EnumDescriptor parent, int index)
            : base(file, parent.FullName + "." + proto.Name, index)
        {
            this.proto = proto;
            enumDescriptor = parent;
            file.DescriptorPool.AddSymbol(this);
            file.DescriptorPool.AddEnumValueByNumber(this);
        }

        internal EnumValueDescriptorProto Proto { get { return proto; } }

        /// <summary>
        /// Returns the name of the enum value described by this object.
        /// </summary>
        public override string Name { get { return proto.Name; } }

        /// <summary>
        /// Returns the number associated with this enum value.
        /// </summary>
        public int Number { get { return Proto.Number; } }

        /// <summary>
        /// Returns the enum descriptor that this value is part of.
        /// </summary>
        public EnumDescriptor EnumDescriptor { get { return enumDescriptor; } }

        /// <summary>
        /// The (possibly empty) set of custom options for this enum value.
        /// </summary>
        [Obsolete("CustomOptions are obsolete. Use the Options property")]
        public CustomOptions CustomOptions => new CustomOptions(Proto.Options?._extensions?.ValuesByNumber);

        /// <summary>
        /// The <c>EnumValueOptions</c>, defined in <c>descriptor.proto</c>.
        /// Custom options can be retrieved as extensions of the returned message.
        /// NOTE: A defensive copy is created each time this property is retrieved.
        /// </summary>
        public EnumValueOptions Options => (Proto.Options as IDeepCloneable<EnumValueOptions>)?.Clone();
    }
}