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// Copyright (c) Microsoft Open Technologies, Inc. All rights reserved. See License.txt in the project root for license information.
using System;
using System.Collections.Generic;
using System.Globalization;
using System.Reflection;
#if HAS_WINRT
using System.Runtime.InteropServices.WindowsRuntime;
#endif
namespace System.Reactive
{
static class ReflectionUtils
{
public static TDelegate CreateDelegate<TDelegate>(object o, MethodInfo method)
{
#if CRIPPLED_REFLECTION
return (TDelegate)(object)method.CreateDelegate(typeof(TDelegate), o);
#else
return (TDelegate)(object)Delegate.CreateDelegate(typeof(TDelegate), o, method);
#endif
}
public static Delegate CreateDelegate(Type delegateType, object o, MethodInfo method)
{
#if CRIPPLED_REFLECTION
return method.CreateDelegate(delegateType, o);
#else
return Delegate.CreateDelegate(delegateType, o, method);
#endif
}
public static void GetEventMethods<TSender, TEventArgs>(Type targetType, object target, string eventName, out MethodInfo addMethod, out MethodInfo removeMethod, out Type delegateType, out bool isWinRT)
#if !NO_EVENTARGS_CONSTRAINT
where TEventArgs : EventArgs
#endif
{
var e = default(EventInfo);
if (target == null)
{
e = targetType.GetEventEx(eventName, true);
if (e == null)
throw new InvalidOperationException(string.Format(CultureInfo.CurrentCulture, Strings_Linq.COULD_NOT_FIND_STATIC_EVENT, eventName, targetType.FullName));
}
else
{
e = targetType.GetEventEx(eventName, false);
if (e == null)
throw new InvalidOperationException(string.Format(CultureInfo.CurrentCulture, Strings_Linq.COULD_NOT_FIND_INSTANCE_EVENT, eventName, targetType.FullName));
}
addMethod = e.GetAddMethod();
removeMethod = e.GetRemoveMethod();
if (addMethod == null)
throw new InvalidOperationException(Strings_Linq.EVENT_MISSING_ADD_METHOD);
if (removeMethod == null)
throw new InvalidOperationException(Strings_Linq.EVENT_MISSING_REMOVE_METHOD);
var psa = addMethod.GetParameters();
if (psa.Length != 1)
throw new InvalidOperationException(Strings_Linq.EVENT_ADD_METHOD_SHOULD_TAKE_ONE_PARAMETER);
var psr = removeMethod.GetParameters();
if (psr.Length != 1)
throw new InvalidOperationException(Strings_Linq.EVENT_REMOVE_METHOD_SHOULD_TAKE_ONE_PARAMETER);
isWinRT = false;
#if HAS_WINRT
if (addMethod.ReturnType == typeof(EventRegistrationToken))
{
isWinRT = true;
var pet = psr[0];
if (pet.ParameterType != typeof(EventRegistrationToken))
throw new InvalidOperationException(Strings_Linq.EVENT_WINRT_REMOVE_METHOD_SHOULD_TAKE_ERT);
}
#endif
delegateType = psa[0].ParameterType;
var invokeMethod = delegateType.GetMethod("Invoke");
var parameters = invokeMethod.GetParameters();
if (parameters.Length != 2)
throw new InvalidOperationException(Strings_Linq.EVENT_PATTERN_REQUIRES_TWO_PARAMETERS);
if (!typeof(TSender).IsAssignableFrom(parameters[0].ParameterType))
throw new InvalidOperationException(string.Format(CultureInfo.CurrentCulture, Strings_Linq.EVENT_SENDER_NOT_ASSIGNABLE, typeof(TSender).FullName));
if (!typeof(TEventArgs).IsAssignableFrom(parameters[1].ParameterType))
throw new InvalidOperationException(string.Format(CultureInfo.CurrentCulture, Strings_Linq.EVENT_ARGS_NOT_ASSIGNABLE, typeof(TEventArgs).FullName));
if (invokeMethod.ReturnType != typeof(void))
throw new InvalidOperationException(Strings_Linq.EVENT_MUST_RETURN_VOID);
}
public static EventInfo GetEventEx(this Type type, string name, bool isStatic)
{
#if CRIPPLED_REFLECTION
// TODO: replace in the future by System.Reflection.RuntimeExtensions extension methods
var q = new Queue<TypeInfo>();
q.Enqueue(type.GetTypeInfo());
while (q.Count > 0)
{
var t = q.Dequeue();
var e = t.GetDeclaredEvent(name);
if (e != null)
return e;
foreach (var i in t.ImplementedInterfaces)
q.Enqueue(i.GetTypeInfo());
if (t.BaseType != null)
q.Enqueue(t.BaseType.GetTypeInfo());
}
return null;
#else
return type.GetEvent(name, isStatic ? BindingFlags.Public | BindingFlags.Static : BindingFlags.Public | BindingFlags.Instance);
#endif
}
#if CRIPPLED_REFLECTION
public static MethodInfo GetMethod(this Type type, string name)
{
return type.GetTypeInfo().GetDeclaredMethod(name);
}
public static MethodInfo GetAddMethod(this EventInfo eventInfo)
{
return eventInfo.AddMethod;
}
public static MethodInfo GetRemoveMethod(this EventInfo eventInfo)
{
return eventInfo.RemoveMethod;
}
public static bool IsAssignableFrom(this Type type1, Type type2)
{
return type1.GetTypeInfo().IsAssignableFrom(type2.GetTypeInfo());
}
#endif
}
}
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