mcs/class/corlib/System.Runtime.Serialization/SerializationCallbacks.cs

   1 //
   2 // System.Runtime.Serialization.SerializationCallbacks.cs
   3 //
   4 // Author:
   5 //   Robert Jordan (robertj@gmx.net)
   6 //
   7 // Copyright (C) 2006 Novell, Inc (http://www.novell.com)
   8 //
   9 // Permission is hereby granted, free of charge, to any person obtaining
  10 // a copy of this software and associated documentation files (the
  11 // "Software"), to deal in the Software without restriction, including
  12 // without limitation the rights to use, copy, modify, merge, publish,
  13 // distribute, sublicense, and/or sell copies of the Software, and to
  14 // permit persons to whom the Software is furnished to do so, subject to
  15 // the following conditions:
  16 //
  17 // The above copyright notice and this permission notice shall be
  18 // included in all copies or substantial portions of the Software.
  19 //
  20 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  21 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  22 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  23 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  24 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  25 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  26 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  27 //
  28
  29 #if NET_2_0
  30
  31 using System;
  32 using System.Collections;
  33 using System.Reflection;
  34
  35 namespace System.Runtime.Serialization {
  36
  37         internal sealed class SerializationCallbacks
  38         {
  39                 public delegate void CallbackHandler (StreamingContext context);
  40
  41                 readonly ArrayList onSerializingList;
  42                 readonly ArrayList onSerializedList;
  43                 readonly ArrayList onDeserializingList;
  44                 readonly ArrayList onDeserializedList;
  45
  46                 public bool HasSerializingCallbacks {
  47                         get {return onSerializingList != null;}
  48                 }
  49
  50                 public bool HasSerializedCallbacks {
  51                         get {return onSerializedList != null;}
  52                 }
  53
  54                 public bool HasDeserializingCallbacks {
  55                         get {return onDeserializingList != null;}
  56                 }
  57
  58                 public bool HasDeserializedCallbacks {
  59                         get {return onDeserializedList != null;}
  60                 }
  61
  62                 public SerializationCallbacks (Type type)
  63                 {
  64                         onSerializingList   = GetMethodsByAttribute (type, typeof (OnSerializingAttribute));
  65                         onSerializedList    = GetMethodsByAttribute (type, typeof (OnSerializedAttribute));
  66                         onDeserializingList = GetMethodsByAttribute (type, typeof (OnDeserializingAttribute));
  67                         onDeserializedList  = GetMethodsByAttribute (type, typeof (OnDeserializedAttribute));
  68                 }
  69
  70                 const BindingFlags DefaultBindingFlags = BindingFlags.Public | BindingFlags.NonPublic |
  71                         BindingFlags.Instance | BindingFlags.DeclaredOnly;
  72
  73
  74                 static ArrayList GetMethodsByAttribute (Type type, Type attr)
  75                 {
  76                         ArrayList list = new ArrayList ();
  77
  78                         Type t = type;
  79                         while (t != typeof (object)) {
  80                                 int count = 0;
  81
  82                                 foreach (MethodInfo mi in t.GetMethods (DefaultBindingFlags)) {
  83                                         if (mi.IsDefined (attr, false)) {
  84                                                 list.Add (mi);
  85                                                 count++;
  86                                         }
  87                                 }
  88
  89                                 // FIXME: MS.NET is checking for this with the verifier at assembly load time.
  90                                 if (count > 1)
  91                                         throw new TypeLoadException (
  92                                                 String.Format ("Type '{0}' has more than one method with the following attribute: '{1}'.", type.AssemblyQualifiedName, attr.FullName));
  93
  94                                 t = t.BaseType;
  95                         }
  96
  97                         // optimize memory usage
  98                         return list.Count == 0 ? null : list;
  99                 }
 100
 101                 static void Invoke (ArrayList list, object target, StreamingContext context)
 102                 {
 103                         if (list == null)
 104                                 return;
 105
 106                         CallbackHandler handler = null;
 107
 108                         // construct a delegate from the specified list
 109                         foreach (MethodInfo mi in list) {
 110                                 handler = (CallbackHandler)
 111                                         Delegate.Combine (
 112                                                 Delegate.CreateDelegate (typeof (CallbackHandler), target, mi),
 113                                                 handler);
 114                         }
 115
 116                         handler (context);
 117                 }
 118
 119                 public void RaiseOnSerializing (object target, StreamingContext contex)
 120                 {
 121                         Invoke (onSerializingList, target, contex);
 122                 }
 123
 124                 public void RaiseOnSerialized (object target, StreamingContext contex)
 125                 {
 126                         Invoke (onSerializedList, target, contex);
 127                 }
 128
 129                 public void RaiseOnDeserializing (object target, StreamingContext contex)
 130                 {
 131                         Invoke (onDeserializingList, target, contex);
 132                 }
 133
 134                 public void RaiseOnDeserialized (object target, StreamingContext contex)
 135                 {
 136                         Invoke (onDeserializedList, target, contex);
 137                 }
 138
 139                 static Hashtable cache = new Hashtable ();
 140
 141                 public static SerializationCallbacks GetSerializationCallbacks (Type t)
 142                 {
 143                         lock (cache.SyncRoot) {
 144
 145                                 SerializationCallbacks sc = (SerializationCallbacks)  cache [t];
 146                                 if (sc == null) {
 147                                         sc = new SerializationCallbacks (t);
 148                                         cache [t] = sc;
 149                                 }
 150                                 return sc;
 151                         }
 152                 }
 153         }
 154 }
 155
 156 #endif