121 lines
3.5 KiB
C#
121 lines
3.5 KiB
C#
//
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// System.Runtime.Serialization.SurrogateSelector.cs
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//
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// Author: Duncan Mak (duncan@ximian.com)
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// Lluis Sanchez (lsg@ctv.es)
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//
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// (C) Ximian, Inc.
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//
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//
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// Copyright (C) 2004 Novell, Inc (http://www.novell.com)
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//
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// Permission is hereby granted, free of charge, to any person obtaining
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// a copy of this software and associated documentation files (the
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// "Software"), to deal in the Software without restriction, including
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// without limitation the rights to use, copy, modify, merge, publish,
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// distribute, sublicense, and/or sell copies of the Software, and to
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// permit persons to whom the Software is furnished to do so, subject to
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// the following conditions:
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//
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// The above copyright notice and this permission notice shall be
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// included in all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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//
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using System;
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using System.Collections;
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namespace System.Runtime.Serialization
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{
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[System.Runtime.InteropServices.ComVisibleAttribute (true)]
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public class SurrogateSelector : ISurrogateSelector
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{
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// Fields
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Hashtable Surrogates = new Hashtable ();
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ISurrogateSelector nextSelector = null;
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// Constructor
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public SurrogateSelector()
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: base ()
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{
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}
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// Methods
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public virtual void AddSurrogate (Type type,
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StreamingContext context, ISerializationSurrogate surrogate)
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{
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if (type == null || surrogate == null)
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throw new ArgumentNullException ("Null reference.");
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string currentKey = type.FullName + "#" + context.ToString ();
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if (Surrogates.ContainsKey (currentKey))
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throw new ArgumentException ("A surrogate for " + type.FullName + " already exists.");
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Surrogates.Add (currentKey, surrogate);
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}
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public virtual void ChainSelector (ISurrogateSelector selector)
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{
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if (selector == null)
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throw new ArgumentNullException ("Selector is null.");
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// Chain the selector at the beggining of the chain
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// since "The last selector added to the list will be the first one checked"
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// (from MS docs)
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if (nextSelector != null)
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selector.ChainSelector (nextSelector);
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nextSelector = selector;
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}
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public virtual ISurrogateSelector GetNextSelector ()
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{
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return nextSelector;
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}
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public virtual ISerializationSurrogate GetSurrogate (Type type,
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StreamingContext context, out ISurrogateSelector selector)
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{
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if (type == null)
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throw new ArgumentNullException ("type is null.");
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// Check this selector, and if the surrogate is not found,
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// check the chained selectors
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string key = type.FullName + "#" + context.ToString ();
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ISerializationSurrogate surrogate = (ISerializationSurrogate) Surrogates [key];
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if (surrogate != null) {
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selector = this;
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return surrogate;
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}
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if (nextSelector != null)
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return nextSelector.GetSurrogate (type, context, out selector);
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else {
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selector = null;
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return null;
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}
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}
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public virtual void RemoveSurrogate (Type type, StreamingContext context)
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{
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if (type == null)
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throw new ArgumentNullException ("type is null.");
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string key = type.FullName + "#" + context.ToString ();
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Surrogates.Remove (key);
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}
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}
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}
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