diff options
author | Jon Skeet <skeet@pobox.com> | 2008-10-22 13:18:49 +0100 |
---|---|---|
committer | Jon Skeet <skeet@pobox.com> | 2008-10-22 13:18:49 +0100 |
commit | f0589506c96600dcd01319b9d1929d87505f3daa (patch) | |
tree | 945bc56e2e2da748271acc8e80deb7ca22aaaf54 /csharp/ProtocolBuffers/FieldAccess/ReflectionUtil.cs | |
parent | e60ce8bfafca616ed4fd430ae4f82360de165e80 (diff) | |
download | protobuf-f0589506c96600dcd01319b9d1929d87505f3daa.tar.gz protobuf-f0589506c96600dcd01319b9d1929d87505f3daa.tar.bz2 protobuf-f0589506c96600dcd01319b9d1929d87505f3daa.zip |
Wiping slate clean to start again with new layout.
Diffstat (limited to 'csharp/ProtocolBuffers/FieldAccess/ReflectionUtil.cs')
-rw-r--r-- | csharp/ProtocolBuffers/FieldAccess/ReflectionUtil.cs | 109 |
1 files changed, 0 insertions, 109 deletions
diff --git a/csharp/ProtocolBuffers/FieldAccess/ReflectionUtil.cs b/csharp/ProtocolBuffers/FieldAccess/ReflectionUtil.cs deleted file mode 100644 index ddec2229..00000000 --- a/csharp/ProtocolBuffers/FieldAccess/ReflectionUtil.cs +++ /dev/null @@ -1,109 +0,0 @@ -// 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 System.Reflection; - -namespace Google.ProtocolBuffers.FieldAccess { - - /// <summary> - /// The methods in this class are somewhat evil, and should not be tampered with lightly. - /// Basically they allow the creation of relatively weakly typed delegates from MethodInfos - /// which are more strongly typed. They do this by creating an appropriate strongly typed - /// delegate from the MethodInfo, and then calling that within an anonymous method. - /// Mind-bending stuff (at least to your humble narrator) but the resulting delegates are - /// very fast compared with calling Invoke later on. - /// </summary> - internal static class ReflectionUtil { - - /// <summary> - /// Creates a delegate which will execute the given method and then return - /// the result as an object. - /// </summary> - public static Func<T, object> CreateUpcastDelegate<T>(MethodInfo method) { - - // The tricky bit is invoking CreateCreateUpcastDelegateImpl with the right type parameters - MethodInfo openImpl = typeof(ReflectionUtil).GetMethod("CreateUpcastDelegateImpl"); - MethodInfo closedImpl = openImpl.MakeGenericMethod(typeof(T), method.ReturnType); - return (Func<T, object>) closedImpl.Invoke(null, new object[] { method }); - } - - /// <summary> - /// Method used solely for implementing CreateUpcastDelegate. Public to avoid trust issues - /// in low-trust scenarios, e.g. Silverlight. - /// TODO(jonskeet): Check any of this actually works in Silverlight... - /// </summary> - public static Func<TSource, object> CreateUpcastDelegateImpl<TSource, TResult>(MethodInfo method) { - // Convert the reflection call into an open delegate, i.e. instead of calling x.Method() - // we'll call getter(x). - Func<TSource, TResult> getter = (Func<TSource, TResult>)Delegate.CreateDelegate(typeof(Func<TSource, TResult>), method); - - // Implicit upcast to object (within the delegate) - return delegate(TSource source) { return getter(source); }; - } - - - /// <summary> - /// Creates a delegate which will execute the given method after casting the parameter - /// down from object to the required parameter type. - /// </summary> - public static Action<T, object> CreateDowncastDelegate<T>(MethodInfo method) { - MethodInfo openImpl = typeof(ReflectionUtil).GetMethod("CreateDowncastDelegateImpl"); - MethodInfo closedImpl = openImpl.MakeGenericMethod(typeof(T), method.GetParameters()[0].ParameterType); - return (Action<T, object>) closedImpl.Invoke(null, new object[] { method }); - } - - public static Action<TSource, object> CreateDowncastDelegateImpl<TSource, TParam>(MethodInfo method) { - // Convert the reflection call into an open delegate, i.e. instead of calling x.Method(y) we'll - // call Method(x, y) - Action<TSource, TParam> call = (Action<TSource, TParam>) Delegate.CreateDelegate(typeof(Action<TSource, TParam>), method); - - return delegate(TSource source, object parameter) { call(source, (TParam)parameter); }; - } - - /// <summary> - /// Creates a delegate which will execute the given method after casting the parameter - /// down from object to the required parameter type. - /// </summary> - public static Action<T, object> CreateDowncastDelegateIgnoringReturn<T>(MethodInfo method) { - MethodInfo openImpl = typeof(ReflectionUtil).GetMethod("CreateDowncastDelegateIgnoringReturnImpl"); - MethodInfo closedImpl = openImpl.MakeGenericMethod(typeof(T), method.GetParameters()[0].ParameterType, method.ReturnType); - return (Action<T, object>)closedImpl.Invoke(null, new object[] { method }); - } - - public static Action<TSource, object> CreateDowncastDelegateIgnoringReturnImpl<TSource, TParam, TReturn>(MethodInfo method) { - // Convert the reflection call into an open delegate, i.e. instead of calling x.Method(y) we'll - // call Method(x, y) - Func<TSource, TParam, TReturn> call = (Func<TSource, TParam, TReturn>) - Delegate.CreateDelegate(typeof(Func<TSource, TParam, TReturn>), method); - - return delegate(TSource source, object parameter) { call(source, (TParam)parameter); }; - } - - /// <summary> - /// Creates a delegate which will execute the given static method and cast the result up to IBuilder. - /// </summary> - public static Func<IBuilder> CreateStaticUpcastDelegate(MethodInfo method) { - MethodInfo openImpl = typeof(ReflectionUtil).GetMethod("CreateStaticUpcastDelegateImpl"); - MethodInfo closedImpl = openImpl.MakeGenericMethod(method.ReturnType); - return (Func<IBuilder>)closedImpl.Invoke(null, new object[] { method }); - } - - public static Func<IBuilder> CreateStaticUpcastDelegateImpl<T>(MethodInfo method) { - Func<T> call = (Func<T>)Delegate.CreateDelegate(typeof(Func<T>), method); - return delegate { return (IBuilder)call(); }; - } - } -} |