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//
// System.Runtime.Serialization.SurrogateSelector.cs
//
// Author: Duncan Mak (duncan@ximian.com)
//
// (C) Ximian, Inc.
//
using System;
using System.Collections;
namespace System.Runtime.Serialization
{
public class SurrogateSelector : ISurrogateSelector
{
// Fields
Hashtable Surrogates = new Hashtable ();
string currentKey = null; // current key of Surrogates
internal struct Bundle
{
public ISerializationSurrogate surrogate;
public ArrayList selectors;
public Bundle (ISerializationSurrogate surrogate)
{
this.surrogate = surrogate;
selectors = new ArrayList ();
}
}
// 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.");
currentKey = type.FullName + "#" + context.ToString ();
if (Surrogates.ContainsKey (currentKey))
throw new ArgumentException ("A surrogate for " + type.FullName + " already exists.");
Bundle values = new Bundle (surrogate);
Surrogates.Add (currentKey, values);
}
public virtual void ChainSelector (ISurrogateSelector selector)
{
if (selector == null)
throw new ArgumentNullException ("Selector is null.");
Bundle current = (Bundle) Surrogates [currentKey];
current.selectors.Add (selector);
}
public virtual ISurrogateSelector GetNextSelector ()
{
Bundle current = (Bundle) Surrogates [currentKey];
return (ISurrogateSelector) current.selectors [current.selectors.Count];
}
public virtual ISerializationSurrogate GetSurrogate (Type type,
StreamingContext context, out ISurrogateSelector selector)
{
if (type == null)
throw new ArgumentNullException ("type is null.");
string key = type.FullName + "#" + context.ToString ();
Bundle current = (Bundle) Surrogates [key];
selector = (ISurrogateSelector) current.selectors [current.selectors.Count - 1];
return (ISerializationSurrogate) current.surrogate;
}
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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