#region Copyright notice and license | |
// 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. | |
#endregion | |
using System; | |
using System.Collections.Generic; | |
namespace Google.ProtocolBuffers | |
{ | |
///<summary> | |
///Interface for an enum value or value descriptor, to be used in FieldSet. | |
///The lite library stores enum values directly in FieldSets but the full | |
///library stores EnumValueDescriptors in order to better support reflection. | |
///</summary> | |
public interface IEnumLite | |
{ | |
int Number { get; } | |
string Name { get; } | |
} | |
///<summary> | |
///Interface for an object which maps integers to {@link EnumLite}s. | |
///{@link Descriptors.EnumDescriptor} implements this interface by mapping | |
///numbers to {@link Descriptors.EnumValueDescriptor}s. Additionally, | |
///every generated enum type has a static method internalGetValueMap() which | |
///returns an implementation of this type that maps numbers to enum values. | |
///</summary> | |
public interface IEnumLiteMap<T> : IEnumLiteMap | |
where T : IEnumLite | |
{ | |
new T FindValueByNumber(int number); | |
} | |
public interface IEnumLiteMap | |
{ | |
bool IsValidValue(IEnumLite value); | |
IEnumLite FindValueByNumber(int number); | |
IEnumLite FindValueByName(string name); | |
} | |
public class EnumLiteMap<TEnum> : IEnumLiteMap<IEnumLite> | |
where TEnum : struct, IComparable, IFormattable | |
{ | |
private struct EnumValue : IEnumLite | |
{ | |
private readonly TEnum value; | |
public EnumValue(TEnum value) | |
{ | |
this.value = value; | |
} | |
int IEnumLite.Number | |
{ | |
get { return Convert.ToInt32(value); } | |
} | |
string IEnumLite.Name | |
{ | |
get { return value.ToString(); } | |
} | |
} | |
public IEnumLite FindValueByNumber(int number) | |
{ | |
TEnum val = default(TEnum); | |
if (EnumParser<TEnum>.TryConvert(number, ref val)) | |
{ | |
return new EnumValue(val); | |
} | |
return null; | |
} | |
public IEnumLite FindValueByName(string name) | |
{ | |
TEnum val = default(TEnum); | |
if (EnumParser<TEnum>.TryConvert(name, ref val)) | |
{ | |
return new EnumValue(val); | |
} | |
return null; | |
} | |
public bool IsValidValue(IEnumLite value) | |
{ | |
TEnum val = default(TEnum); | |
return EnumParser<TEnum>.TryConvert(value.Number, ref val); | |
} | |
} | |
public static class EnumParser<T> where T : struct, IComparable, IFormattable | |
{ | |
private static readonly Dictionary<int, T> _byNumber; | |
private static Dictionary<string, T> _byName; | |
static EnumParser() | |
{ | |
int[] array; | |
try | |
{ | |
#if CLIENTPROFILE | |
// It will actually be a T[], but the CLR will let us convert. | |
array = (int[])Enum.GetValues(typeof(T)); | |
#else | |
var temp = new List<T>(); | |
foreach (var fld in typeof (T).GetFields(System.Reflection.BindingFlags.Public | System.Reflection.BindingFlags.Static)) | |
{ | |
if (fld.IsLiteral && fld.FieldType == typeof(T)) | |
{ | |
temp.Add((T)fld.GetValue(null)); | |
} | |
} | |
array = (int[])(object)temp.ToArray(); | |
#endif | |
} | |
catch | |
{ | |
_byNumber = null; | |
return; | |
} | |
_byNumber = new Dictionary<int, T>(array.Length); | |
foreach (int i in array) | |
{ | |
_byNumber[i] = (T)(object)i; | |
} | |
} | |
public static bool TryConvert(object input, ref T value) | |
{ | |
if (input is int || input is T) | |
{ | |
return TryConvert((int)input, ref value); | |
} | |
if (input is string) | |
{ | |
return TryConvert((string)input, ref value); | |
} | |
return false; | |
} | |
/// <summary> | |
/// Tries to convert an integer to its enum representation. This would take an out parameter, | |
/// but the caller uses ref, so this approach is simpler. | |
/// </summary> | |
public static bool TryConvert(int number, ref T value) | |
{ | |
// null indicates an exception at construction, use native IsDefined. | |
if (_byNumber == null) | |
{ | |
return Enum.IsDefined(typeof(T), number); | |
} | |
T converted; | |
if (_byNumber != null && _byNumber.TryGetValue(number, out converted)) | |
{ | |
value = converted; | |
return true; | |
} | |
return false; | |
} | |
/// <summary> | |
/// Tries to convert a string to its enum representation. This would take an out parameter, | |
/// but the caller uses ref, so this approach is simpler. | |
/// </summary> | |
public static bool TryConvert(string name, ref T value) | |
{ | |
// null indicates an exception at construction, use native IsDefined/Parse. | |
if (_byNumber == null) | |
{ | |
if (Enum.IsDefined(typeof(T), name)) | |
{ | |
value = (T)Enum.Parse(typeof(T), name, false); | |
return true; | |
} | |
return false; | |
} | |
// known race, possible multiple threads each build their own copy; however, last writer will win | |
var map = _byName; | |
if (map == null) | |
{ | |
map = new Dictionary<string, T>(StringComparer.Ordinal); | |
foreach (var possible in _byNumber.Values) | |
{ | |
map[possible.ToString()] = possible; | |
} | |
_byName = map; | |
} | |
T converted; | |
if (map.TryGetValue(name, out converted)) | |
{ | |
value = converted; | |
return true; | |
} | |
return false; | |
} | |
} | |
} |