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//
// System.DelegateSerializationHolder.cs
//
// Author:
// Lluis Sanchez Gual (lsg@ctv.es)
//
// (C) 2003 Lluis Sanchez Gual
//
//
// Copyright (C) 2004 Novell, Inc (http://www.novell.com)
//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//
using System.Reflection;
using System.Runtime.Serialization;
using System.Runtime.Remoting;
namespace System
{
[Serializable]
internal class DelegateSerializationHolder: ISerializable, IObjectReference
{
Delegate _delegate; // The deserialized delegate
[Serializable]
class DelegateEntry
{
string type;
string assembly;
public object target;
string targetTypeAssembly;
string targetTypeName;
string methodName;
public DelegateEntry delegateEntry; // next delegate in the invocation list
// A DelegateEntry holds information about a delegate that is part
// of an invocation list of a multicast delegate.
public DelegateEntry (Delegate del, string targetLabel)
{
type = del.GetType().FullName;
assembly = del.GetType().Assembly.FullName;
target = targetLabel;
targetTypeAssembly = del.Method.DeclaringType.Assembly.FullName;
targetTypeName = del.Method.DeclaringType.FullName;
methodName = del.Method.Name;
}
public Delegate DeserializeDelegate (SerializationInfo info)
{
object realTarget = null;
if (target != null)
realTarget = info.GetValue (target.ToString(), typeof(object));
Assembly dasm = Assembly.Load (assembly);
Type dt = dasm.GetType (type);
Delegate del;
if (realTarget != null) {
if (RemotingServices.IsTransparentProxy (realTarget)) {
// The call to IsInstanceOfType will force the proxy
// to load the real type of the remote object. This is
// needed to make sure that subsequent calls to
// GetType() return the expected type.
Assembly tasm = Assembly.Load (targetTypeAssembly);
Type tt = tasm.GetType (targetTypeName);
if (!tt.IsInstanceOfType (realTarget))
throw new RemotingException ("Unexpected proxy type.");
}
del = Delegate.CreateDelegate (dt, realTarget, methodName);
}
else {
Assembly tasm = Assembly.Load (targetTypeAssembly);
Type tt = tasm.GetType (targetTypeName);
del = Delegate.CreateDelegate (dt, tt, methodName);
}
if (!del.Method.IsPublic)
throw new SerializationException (Locale.GetText (
"Serialization will not deserialize delegates to non-public methods."));
return del;
}
}
DelegateSerializationHolder(SerializationInfo info, StreamingContext ctx)
{
DelegateEntry entryChain = (DelegateEntry)info.GetValue ("Delegate", typeof(DelegateEntry));
// Count the number of delegates to combine
int count = 0;
DelegateEntry entry = entryChain;
while (entry != null) {
entry = entry.delegateEntry;
count++;
}
// Deserializes and combines the delegates
if (count == 1)
_delegate = entryChain.DeserializeDelegate (info);
else
{
Delegate[] delegates = new Delegate[count];
entry = entryChain;
for (int n=0; n<count; n++)
{
delegates[n] = entry.DeserializeDelegate (info);
entry = entry.delegateEntry;
}
_delegate = Delegate.Combine (delegates);
}
}
public static void GetDelegateData (Delegate instance, SerializationInfo info, StreamingContext ctx)
{
// Fills a SerializationInfo object with the information of the delegate.
Delegate[] delegates = instance.GetInvocationList ();
DelegateEntry lastEntry = null;
for (int n=0; n<delegates.Length; n++) {
Delegate del = delegates[n];
string targetLabel = (del.Target != null) ? ("target" + n) : null;
DelegateEntry entry = new DelegateEntry (del, targetLabel);
if (lastEntry == null)
info.AddValue ("Delegate", entry);
else
lastEntry.delegateEntry = entry;
lastEntry = entry;
if (del.Target != null)
info.AddValue (targetLabel, del.Target);
}
info.SetType (typeof (DelegateSerializationHolder));
}
public void GetObjectData (SerializationInfo info, StreamingContext context)
{
// Not needed.
throw new NotSupportedException ();
}
public object GetRealObject (StreamingContext context)
{
return _delegate;
}
}
}
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