2 // System.Text.SurrogateEncoder.cs
5 // Kornél Pál <http://www.kornelpal.hu/>
7 // Copyright (C) 2006 Kornél Pál
11 // Permission is hereby granted, free of charge, to any person obtaining
12 // a copy of this software and associated documentation files (the
13 // "Software"), to deal in the Software without restriction, including
14 // without limitation the rights to use, copy, modify, merge, publish,
15 // distribute, sublicense, and/or sell copies of the Software, and to
16 // permit persons to whom the Software is furnished to do so, subject to
17 // the following conditions:
19 // The above copyright notice and this permission notice shall be
20 // included in all copies or substantial portions of the Software.
22 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
23 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
24 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
25 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
26 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
27 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
28 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
32 // These proxy classes implement IObjectReference.GetRealObject() that returns
33 // an instance of the appropriate Encoding, Encoder or Decoder class.
34 // As a result serialized objects of these types will transparently be
35 // deserialized to instances of the above described classes.
37 // Use SerializationInfo.SetType() in ISerializable.GetObjectData() method of
38 // serializable classes to serialize their instances using a proxy class.
40 // All of these proxy classes are non-public thus they only have to be
41 // serialization compatible with .NET Framework.
45 // .NET Framework 1.x uses this class for GB18030 encoder and
46 // .NET Framework 2.0 can deserialize it using a proxy.
47 // This class supports serialization compatibility.
51 using System.Runtime.Serialization;
56 internal sealed class SurrogateEncoder : ISerializable, IObjectReference
58 private Encoding encoding;
59 private Encoder realObject;
61 private SurrogateEncoder (SerializationInfo info, StreamingContext context)
64 throw new ArgumentNullException ("info");
66 this.encoding = (Encoding) info.GetValue ("m_encoding", typeof (Encoding));
69 public void GetObjectData (SerializationInfo info, StreamingContext context)
71 throw new ArgumentException ("This class cannot be serialized.");
74 public object GetRealObject (StreamingContext context)
76 if (this.realObject == null)
77 this.realObject = this.encoding.GetEncoder ();
79 return this.realObject;