2 // System.Runtime.Serialization.SerializationObjectManager.cs
5 // Robert Jordan (robertj@gmx.net)
7 // Copyright (C) 2006 Novell, Inc (http://www.novell.com)
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:
17 // The above copyright notice and this permission notice shall be
18 // included in all copies or substantial portions of the Software.
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.
30 using System.Collections;
32 namespace System.Runtime.Serialization {
34 public sealed class SerializationObjectManager
36 readonly StreamingContext context;
37 readonly Hashtable seen = new Hashtable (HashHelper.Instance, HashHelper.Instance);
39 event SerializationCallbacks.CallbackHandler callbacks;
41 public SerializationObjectManager (StreamingContext context)
43 this.context = context;
46 public void RegisterObject (object obj)
48 if (seen.Contains (obj))
51 SerializationCallbacks sc = SerializationCallbacks
52 .GetSerializationCallbacks (obj.GetType ());
54 seen [obj] = HashHelper.NonNullObject;
55 sc.RaiseOnSerializing (obj, context);
57 if (sc.HasSerializedCallbacks) {
58 // record for later invocation
59 callbacks += delegate (StreamingContext ctx)
61 sc.RaiseOnSerialized (obj, ctx);
66 public void RaiseOnSerializedEvent ()
68 if (callbacks != null)
72 class HashHelper : IHashCodeProvider, IComparer {
73 public static object NonNullObject = new object ();
74 public static HashHelper Instance = new HashHelper ();
80 public int GetHashCode (object obj)
84 return Object.InternalGetHashCode (obj);
87 public int Compare (object x, object y)
89 return Object.ReferenceEquals (x, y) ? 0 : 1;