mcs/class/corlib/System/MulticastDelegate.cs

   1 //
   2 // System.MultiCastDelegate.cs
   3 //
   4 // Author:
   5 //   Miguel de Icaza (miguel@ximian.com)
   6 //   Daniel Stodden (stodden@in.tum.de)
   7 //
   8 // (C) Ximian, Inc.  http://www.ximian.com
   9 //
  10 // TODO: Remove Missing
  11 //
  12
  13 using System.Globalization;
  14
  15 namespace System {
  16
  17         public abstract class MulticastDelegate : Delegate
  18         {
  19                 private MulticastDelegate prev;
  20
  21                 protected MulticastDelegate (object target, string method)
  22                         : base (target, method)
  23                 {
  24                         prev = null;
  25                 }
  26
  27                 protected MulticastDelegate (Type target_type, string method)
  28                         : base (target_type, method)
  29                 {
  30                         prev = null;
  31                 }
  32
  33 #if NOTYET
  34                 private MulticastDelegate (Type target_type, string method, Delegate [] list)
  35                         : base (target_type, method)
  36                 {
  37                         invocation_list = (Delegate[])list.Clone ();
  38                 }
  39 #endif
  40
  41 #if NOTYET
  42                 public MethodInfo Method {
  43                         get {
  44                                 return null;
  45                         }
  46                 }
  47 #endif
  48
  49                 public override object DynamicInvokeImpl( object[] args )
  50                 {
  51                         if ( prev != null )
  52                                 prev.DynamicInvokeImpl( args );
  53
  54                         return base.DynamicInvokeImpl( args );
  55                 }
  56
  57                 // <remarks>
  58                 //   Equals: two multicast delegates are equal if their base is equal
  59                 //   and their invocations list is equal.
  60                 // </remarks>
  61                 public override bool Equals (object o)
  62                 {
  63                         if ( ! base.Equals( o ) )
  64                                 return false;
  65
  66                         MulticastDelegate d = this;
  67                         MulticastDelegate c = (MulticastDelegate) o;
  68                         do {
  69                                 if ( d != c )
  70                                         return false;
  71
  72                                 c = c.prev;
  73                                 d = d.prev;
  74                         } while ( (object)d != null );
  75
  76                         if ( (object)c == null )
  77                                 return true;
  78
  79                         return false;
  80                 }
  81
  82                 //
  83                 // FIXME: This could use some improvements.
  84                 //
  85                 public override int GetHashCode ()
  86                 {
  87                         return base.GetHashCode ();
  88                 }
  89
  90                 // <summary>
  91                 //   Return, in order of invocation, the invocation list
  92                 //   of a MulticastDelegate
  93                 // </summary>
  94                 public override Delegate[] GetInvocationList()
  95                 {
  96                         throw new NotImplementedException();
  97                 }
  98
  99                 // <summary>
 100                 //   Combines this MulticastDelegate with the (Multicast)Delegate `follow'.
 101                 //   This does _not_ combine with Delegates. ECMA states the whole delegate
 102                 //   thing should have better been a simple System.Delegate class.
 103                 //   Compiler generated delegates are always MulticastDelegates.
 104                 // </summary>
 105                 protected override Delegate CombineImpl( Delegate follow )
 106                 {
 107                         MulticastDelegate combined, orig, clone;
 108
 109                         if ( this.GetType() != follow.GetType() )
 110                                 throw new ArgumentException( Locale.GetText("Incompatible Delegate Types") );
 111
 112                         combined = (MulticastDelegate)follow.Clone();
 113
 114                         for ( clone = combined, orig = ((MulticastDelegate)follow).prev;
 115                               (object)orig != null; orig = orig.prev ) {
 116
 117                                 clone.prev = (MulticastDelegate)orig.Clone();
 118                                 clone = clone.prev;
 119                         }
 120
 121                         clone.prev = (MulticastDelegate)this.Clone();
 122
 123                         for ( clone = clone.prev, orig = this.prev;
 124                               (object)orig != null; orig = orig.prev ) {
 125
 126                                 clone.prev = (MulticastDelegate)orig.Clone();
 127                                 clone = clone.prev;
 128                         }
 129
 130                         return combined;
 131                 }
 132
 133                 protected override Delegate RemoveImpl( Delegate value )
 134                 {
 135                         throw new NotImplementedException();
 136                 }
 137         }
 138 }