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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.Generic;
namespace Google.Protobuf.Reflection
{
/// <summary>
/// Descriptor for an enum type in a .proto file.
/// </summary>
public sealed class EnumDescriptor : DescriptorBase
{
private readonly EnumDescriptorProto proto;
private readonly MessageDescriptor containingType;
private readonly IList<EnumValueDescriptor> values;
private readonly Type clrType;
internal EnumDescriptor(EnumDescriptorProto proto, FileDescriptor file, MessageDescriptor parent, int index, Type clrType)
: base(file, file.ComputeFullName(parent, proto.Name), index)
{
this.proto = proto;
this.clrType = clrType;
containingType = parent;
if (proto.Value.Count == 0)
{
// We cannot allow enums with no values because this would mean there
// would be no valid default value for fields of this type.
throw new DescriptorValidationException(this, "Enums must contain at least one value.");
}
values = DescriptorUtil.ConvertAndMakeReadOnly(proto.Value,
(value, i) => new EnumValueDescriptor(value, file, this, i));
File.DescriptorPool.AddSymbol(this);
}
internal EnumDescriptorProto Proto { get { return proto; } }
/// <summary>
/// The brief name of the descriptor's target.
/// </summary>
public override string Name { get { return proto.Name; } }
internal override IReadOnlyList<DescriptorBase> GetNestedDescriptorListForField(int fieldNumber)
{
switch (fieldNumber)
{
case EnumDescriptorProto.ValueFieldNumber:
return (IReadOnlyList<DescriptorBase>) Values;
default:
return null;
}
}
/// <summary>
/// The CLR type for this enum. For generated code, this will be a CLR enum type.
/// </summary>
public Type ClrType { get { return clrType; } }
/// <value>
/// If this is a nested type, get the outer descriptor, otherwise null.
/// </value>
public MessageDescriptor ContainingType
{
get { return containingType; }
}
/// <value>
/// An unmodifiable list of defined value descriptors for this enum.
/// </value>
public IList<EnumValueDescriptor> Values
{
get { return values; }
}
/// <summary>
/// Finds an enum value by number. If multiple enum values have the
/// same number, this returns the first defined value with that number.
/// If there is no value for the given number, this returns <c>null</c>.
/// </summary>
public EnumValueDescriptor FindValueByNumber(int number)
{
return File.DescriptorPool.FindEnumValueByNumber(this, number);
}
/// <summary>
/// Finds an enum value by name.
/// </summary>
/// <param name="name">The unqualified name of the value (e.g. "FOO").</param>
/// <returns>The value's descriptor, or null if not found.</returns>
public EnumValueDescriptor FindValueByName(string name)
{
return File.DescriptorPool.FindSymbol<EnumValueDescriptor>(FullName + "." + name);
}
/// <summary>
/// The (possibly empty) set of custom options for this enum.
/// </summary>
public CustomOptions CustomOptions => Proto.Options?.CustomOptions ?? CustomOptions.Empty;
}
}
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