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//
// System.Runtime.Serialization.SurrogateSelector.cs
//
// Author: Duncan Mak (duncan@ximian.com)
// Lluis Sanchez (lsg@ctv.es)
//
// (C) Ximian, Inc.
//
//
// 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;
using System.Collections;
namespace System.Runtime.Serialization
{
#if NET_2_0
[System.Runtime.InteropServices.ComVisibleAttribute (true)]
#endif
public class SurrogateSelector : ISurrogateSelector
{
// Fields
Hashtable Surrogates = new Hashtable ();
ISurrogateSelector nextSelector = null;
// Constructor
public SurrogateSelector()
: base ()
{
}
// Methods
public virtual void AddSurrogate (Type type,
StreamingContext context, ISerializationSurrogate surrogate)
{
if (type == null || surrogate == null)
throw new ArgumentNullException ("Null reference.");
string currentKey = type.FullName + "#" + context.ToString ();
if (Surrogates.ContainsKey (currentKey))
throw new ArgumentException ("A surrogate for " + type.FullName + " already exists.");
Surrogates.Add (currentKey, surrogate);
}
public virtual void ChainSelector (ISurrogateSelector selector)
{
if (selector == null)
throw new ArgumentNullException ("Selector is null.");
// Chain the selector at the beggining of the chain
// since "The last selector added to the list will be the first one checked"
// (from MS docs)
if (nextSelector != null)
selector.ChainSelector (nextSelector);
nextSelector = selector;
}
public virtual ISurrogateSelector GetNextSelector ()
{
return nextSelector;
}
public virtual ISerializationSurrogate GetSurrogate (Type type,
StreamingContext context, out ISurrogateSelector selector)
{
if (type == null)
throw new ArgumentNullException ("type is null.");
// Check this selector, and if the surrogate is not found,
// check the chained selectors
string key = type.FullName + "#" + context.ToString ();
ISerializationSurrogate surrogate = (ISerializationSurrogate) Surrogates [key];
if (surrogate != null) {
selector = this;
return surrogate;
}
if (nextSelector != null)
return nextSelector.GetSurrogate (type, context, out selector);
else {
selector = null;
return null;
}
}
public virtual void RemoveSurrogate (Type type, StreamingContext context)
{
if (type == null)
throw new ArgumentNullException ("type is null.");
string key = type.FullName + "#" + context.ToString ();
Surrogates.Remove (key);
}
}
}
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