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Diffstat (limited to 'csharp/src/ProtocolBuffers/EnumLite.cs')
| -rw-r--r-- | csharp/src/ProtocolBuffers/EnumLite.cs | 234 |
1 files changed, 234 insertions, 0 deletions
diff --git a/csharp/src/ProtocolBuffers/EnumLite.cs b/csharp/src/ProtocolBuffers/EnumLite.cs new file mode 100644 index 00000000..1301ec2a --- /dev/null +++ b/csharp/src/ProtocolBuffers/EnumLite.cs @@ -0,0 +1,234 @@ +#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;
+ }
+ }
+}
\ No newline at end of file |