303 lines
9.8 KiB
C#
303 lines
9.8 KiB
C#
//
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// System.Reflection/EventInfo.cs
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//
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// Author:
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// Paolo Molaro (lupus@ximian.com)
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//
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// (C) 2001 Ximian, Inc. http://www.ximian.com
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// Copyright (C) 2004-2005 Novell, Inc (http://www.novell.com)
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//
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// Permission is hereby granted, free of charge, to any person obtaining
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// a copy of this software and associated documentation files (the
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// "Software"), to deal in the Software without restriction, including
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// without limitation the rights to use, copy, modify, merge, publish,
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// distribute, sublicense, and/or sell copies of the Software, and to
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// permit persons to whom the Software is furnished to do so, subject to
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// the following conditions:
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//
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// The above copyright notice and this permission notice shall be
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// included in all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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//
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using System.Diagnostics;
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using System.Runtime.CompilerServices;
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using System.Runtime.InteropServices;
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namespace System.Reflection {
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[ComVisible (true)]
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[ComDefaultInterfaceAttribute (typeof (_EventInfo))]
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[Serializable]
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[ClassInterface(ClassInterfaceType.None)]
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[StructLayout (LayoutKind.Sequential)]
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#if MOBILE
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public abstract class EventInfo : MemberInfo {
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#else
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public abstract class EventInfo : MemberInfo, _EventInfo {
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#endif
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AddEventAdapter cached_add_event;
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public abstract EventAttributes Attributes {get;}
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public
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virtual
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Type EventHandlerType {
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get {
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ParameterInfo[] p;
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MethodInfo add = GetAddMethod (true);
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p = add.GetParametersInternal ();
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if (p.Length > 0) {
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Type t = p [0].ParameterType;
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/* is it alwasys the first arg?
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if (!t.IsSubclassOf (typeof (System.Delegate)))
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throw new Exception ("no delegate in event");*/
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return t;
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}
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return null;
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}
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}
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public
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virtual
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bool IsMulticast {get {return true;}}
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public bool IsSpecialName {get {return (Attributes & EventAttributes.SpecialName ) != 0;}}
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public override MemberTypes MemberType {
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get {return MemberTypes.Event;}
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}
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protected EventInfo() {
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}
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[DebuggerHidden]
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[DebuggerStepThrough]
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public
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virtual
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void AddEventHandler (object target, Delegate handler)
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{
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// this optimization cause problems with full AOT
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// see bug https://bugzilla.xamarin.com/show_bug.cgi?id=3682
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#if FULL_AOT_RUNTIME
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MethodInfo add = GetAddMethod ();
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if (add == null)
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throw new InvalidOperationException ("Cannot add a handler to an event that doesn't have a visible add method");
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if (target == null && !add.IsStatic)
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throw new TargetException ("Cannot add a handler to a non static event with a null target");
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add.Invoke (target, new object [] {handler});
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#else
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if (cached_add_event == null) {
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MethodInfo add = GetAddMethod ();
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if (add == null)
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throw new InvalidOperationException ("Cannot add a handler to an event that doesn't have a visible add method");
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if (add.DeclaringType.IsValueType) {
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if (target == null && !add.IsStatic)
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throw new TargetException ("Cannot add a handler to a non static event with a null target");
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add.Invoke (target, new object [] {handler});
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return;
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}
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cached_add_event = CreateAddEventDelegate (add);
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}
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//if (target == null && is_instance)
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// throw new TargetException ("Cannot add a handler to a non static event with a null target");
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cached_add_event (target, handler);
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#endif
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}
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public MethodInfo GetAddMethod() {
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return GetAddMethod (false);
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}
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public abstract MethodInfo GetAddMethod(bool nonPublic);
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public MethodInfo GetRaiseMethod() {
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return GetRaiseMethod (false);
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}
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public abstract MethodInfo GetRaiseMethod( bool nonPublic);
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public MethodInfo GetRemoveMethod() {
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return GetRemoveMethod (false);
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}
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public abstract MethodInfo GetRemoveMethod( bool nonPublic);
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public virtual MethodInfo[] GetOtherMethods (bool nonPublic) {
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// implemented by the derived class
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return EmptyArray<MethodInfo>.Value;
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}
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public MethodInfo[] GetOtherMethods () {
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return GetOtherMethods (false);
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}
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[DebuggerHidden]
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[DebuggerStepThrough]
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public
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virtual
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void RemoveEventHandler (object target, Delegate handler)
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{
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MethodInfo remove = GetRemoveMethod ();
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if (remove == null)
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throw new InvalidOperationException ("Cannot remove a handler to an event that doesn't have a visible remove method");
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remove.Invoke (target, new object [] {handler});
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}
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public override bool Equals (object obj)
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{
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return obj == (object) this;
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}
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public override int GetHashCode ()
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{
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return base.GetHashCode ();
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}
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public static bool operator == (EventInfo left, EventInfo right)
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{
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if ((object)left == (object)right)
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return true;
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if ((object)left == null ^ (object)right == null)
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return false;
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return left.Equals (right);
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}
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public static bool operator != (EventInfo left, EventInfo right)
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{
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if ((object)left == (object)right)
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return false;
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if ((object)left == null ^ (object)right == null)
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return true;
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return !left.Equals (right);
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}
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#if !MOBILE
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void _EventInfo.GetIDsOfNames ([In] ref Guid riid, IntPtr rgszNames, uint cNames, uint lcid, IntPtr rgDispId)
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{
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throw new NotImplementedException ();
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}
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Type _EventInfo.GetType ()
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{
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// Required or object::GetType becomes virtual final
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return base.GetType ();
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}
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void _EventInfo.GetTypeInfo (uint iTInfo, uint lcid, IntPtr ppTInfo)
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{
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throw new NotImplementedException ();
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}
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void _EventInfo.GetTypeInfoCount (out uint pcTInfo)
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{
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throw new NotImplementedException ();
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}
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void _EventInfo.Invoke (uint dispIdMember, [In] ref Guid riid, uint lcid, short wFlags, IntPtr pDispParams, IntPtr pVarResult, IntPtr pExcepInfo, IntPtr puArgErr)
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{
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throw new NotImplementedException ();
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}
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#endif
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delegate void AddEventAdapter (object _this, Delegate dele);
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// this optimization cause problems with full AOT
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// see bug https://bugzilla.xamarin.com/show_bug.cgi?id=3682
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// do not revove the above delegate or it's field since it's required by the runtime!
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#if !FULL_AOT_RUNTIME
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delegate void AddEvent<T, D> (T _this, D dele);
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delegate void StaticAddEvent<D> (D dele);
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#pragma warning disable 169
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// Used via reflection
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static void AddEventFrame<T,D> (AddEvent<T,D> addEvent, object obj, object dele)
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{
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if (obj == null)
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throw new TargetException ("Cannot add a handler to a non static event with a null target");
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if (!(obj is T))
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throw new TargetException ("Object doesn't match target");
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addEvent ((T)obj, (D)dele);
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}
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static void StaticAddEventAdapterFrame<D> (StaticAddEvent<D> addEvent, object obj, object dele)
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{
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addEvent ((D)dele);
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}
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#pragma warning restore 169
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/*
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* The idea behing this optimization is to use a pair of delegates to simulate the same effect of doing a reflection call.
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* The first delegate performs casting and boxing, the second dispatch to the add_... method.
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*/
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static AddEventAdapter CreateAddEventDelegate (MethodInfo method)
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{
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Type[] typeVector;
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Type addHandlerType;
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object addHandlerDelegate;
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MethodInfo adapterFrame;
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Type addHandlerDelegateType;
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string frameName;
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if (method.IsStatic) {
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typeVector = new Type[] { method.GetParametersInternal () [0].ParameterType };
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addHandlerDelegateType = typeof (StaticAddEvent<>);
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frameName = "StaticAddEventAdapterFrame";
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} else {
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typeVector = new Type[] { method.DeclaringType, method.GetParametersInternal () [0].ParameterType };
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addHandlerDelegateType = typeof (AddEvent<,>);
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frameName = "AddEventFrame";
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}
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addHandlerType = addHandlerDelegateType.MakeGenericType (typeVector);
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#if MOBILE
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// with Silverlight a coreclr failure (e.g. Transparent caller creating a delegate on a Critical method)
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// would normally throw an ArgumentException, so we set throwOnBindFailure to false and check for a null
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// delegate that we can transform into a MethodAccessException
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addHandlerDelegate = Delegate.CreateDelegate (addHandlerType, method, false);
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if (addHandlerDelegate == null)
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throw new MethodAccessException ();
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#else
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addHandlerDelegate = Delegate.CreateDelegate (addHandlerType, method);
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#endif
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adapterFrame = typeof (EventInfo).GetMethod (frameName, BindingFlags.Static | BindingFlags.NonPublic);
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adapterFrame = adapterFrame.MakeGenericMethod (typeVector);
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return (AddEventAdapter)Delegate.CreateDelegate (typeof (AddEventAdapter), addHandlerDelegate, adapterFrame, true);
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}
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#endif
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public virtual MethodInfo AddMethod {
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get { return GetAddMethod (true); }
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}
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public virtual MethodInfo RaiseMethod {
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get { return GetRaiseMethod (true); }
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}
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public virtual MethodInfo RemoveMethod {
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get { return GetRemoveMethod (true); }
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}
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[MethodImplAttribute(MethodImplOptions.InternalCall)]
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private static extern EventInfo internal_from_handle_type (IntPtr event_handle, IntPtr type_handle);
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internal static EventInfo GetEventFromHandle (Mono.RuntimeEventHandle handle)
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{
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if (handle.Value == IntPtr.Zero)
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throw new ArgumentException ("The handle is invalid.");
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return internal_from_handle_type (handle.Value, IntPtr.Zero);
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}
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internal static EventInfo GetEventFromHandle (Mono.RuntimeEventHandle handle, RuntimeTypeHandle reflectedType)
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{
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if (handle.Value == IntPtr.Zero)
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throw new ArgumentException ("The handle is invalid.");
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EventInfo ei = internal_from_handle_type (handle.Value, reflectedType.Value);
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if (ei == null)
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throw new ArgumentException ("The event handle and the type handle are incompatible.");
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return ei;
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}
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}
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}
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