SyndicationElementExtension.cs :  » 2.6.4-mono-.net-core » System.ServiceModel » System » ServiceModel » Syndication » C# / CSharp Open Source

//
// SyndicationElementExtension.cs
//
// Author:
//  Atsushi Enomoto  <atsushi@ximian.com>
//
// Copyright (C) 2007 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.Generic;
using System.Collections.ObjectModel;
using System.IO;
using System.Runtime.Serialization;
using System.Text;
using System.Xml;
using System.Xml.Serialization;

namespace System.ServiceModel.Syndication{
  public class SyndicationElementExtension
  {
    ReadWriteHandler handler;

    public SyndicationElementExtension (object dataContractExtension)
      : this (dataContractExtension, (XmlObjectSerializer) null)
    {
    }

    public SyndicationElementExtension (object dataContractExtension, XmlObjectSerializer dataContractSerializer)
      : this (null, null, dataContractExtension, dataContractSerializer)
    {
    }

    public SyndicationElementExtension (string outerName, string outerNamespace, object dataContractExtension)
      : this (outerName, outerNamespace, dataContractExtension, null)
    {
    }

    public SyndicationElementExtension (string outerName, string outerNamespace, object dataContractExtension, XmlObjectSerializer dataContractSerializer)
    {
      if (dataContractExtension == null)
        throw new ArgumentNullException ("dataContractExtension");
      handler = new DataContractReadWriteHandler (outerName, outerNamespace, dataContractExtension, dataContractSerializer);
    }

    public SyndicationElementExtension (object xmlSerializerExtension, XmlSerializer serializer)
    {
      if (xmlSerializerExtension == null)
        throw new ArgumentNullException ("xmlSerializerExtension");
      handler = new XmlSerializationReadWriteHandler (xmlSerializerExtension, serializer);
    }

    public SyndicationElementExtension (XmlReader xmlReader)
    {
      if (xmlReader == null)
        throw new ArgumentNullException ("xmlReader");
      xmlReader.MoveToContent ();
      if (xmlReader.NodeType != XmlNodeType.Element)
        throw new XmlException ("Element node is expected on the argument xmlReader");

      handler = new XmlReaderReadWriteHandler (xmlReader);
    }

    public string OuterName {
      get { return handler != null ? handler.Name : null; }
    }

    public string OuterNamespace {
      get { return handler != null ? handler.Namespace : null; }
    }

    public TExtension GetObject<TExtension> ()
    {
      return GetObject<TExtension> (new DataContractSerializer (typeof (TExtension)));
    }

    public TExtension GetObject<TExtension> (XmlObjectSerializer serializer)
    {
      if (serializer == null)
        throw new ArgumentNullException ("serializer");
      return (TExtension) serializer.ReadObject (GetReader (), false);
    }

    public TExtension GetObject<TExtension> (XmlSerializer serializer)
    {
      if (serializer == null)
        throw new ArgumentNullException ("serializer");
      return (TExtension) serializer.Deserialize (GetReader ());
    }

    public XmlReader GetReader ()
    {
      return handler.GetReader ();
    }

    public void WriteTo (XmlWriter writer)
    {
      if (writer == null)
        throw new ArgumentNullException ("writer");

      handler.WriteTo (writer);
    }

    abstract class ReadWriteHandler
    {
      public string Name { get; protected set; }

      public string Namespace { get; protected set; }

      public virtual XmlReader GetReader ()
      {
        StringWriter sw = new StringWriter ();
        using (XmlWriter w = XmlWriter.Create (sw))
          WriteTo (w);
        return XmlReader.Create (new StringReader (sw.ToString ()));
      }

      public abstract void WriteTo (XmlWriter writer);
    }

    class DataContractReadWriteHandler : ReadWriteHandler
    {
      object extension;
      XmlObjectSerializer serializer;
      
      public DataContractReadWriteHandler (string name, string ns, object extension, XmlObjectSerializer serializer)
      {
        this.Name = name;
        this.Namespace = ns;
        this.extension = extension;
        this.serializer = serializer;

        if (this.serializer == null)
          this.serializer = new DataContractSerializer (extension.GetType ());
      }

      public override void WriteTo (XmlWriter writer)
      {
        if (Name != null) {
          writer.WriteStartElement (Name, Namespace);
          serializer.WriteObjectContent (writer, extension);
          writer.WriteFullEndElement ();
        }
        else
          serializer.WriteObject (writer, extension);
      }
    }

    class XmlSerializationReadWriteHandler : ReadWriteHandler
    {
      object extension;
      XmlSerializer serializer;

      public XmlSerializationReadWriteHandler (object extension, XmlSerializer serializer)
      {
        this.extension = extension;
        this.serializer = serializer;

        if (serializer == null)
          serializer = new XmlSerializer (extension.GetType ());
      }

      public override void WriteTo (XmlWriter writer)
      {
        serializer.Serialize (writer, extension);
      }
    }

    class XmlReaderReadWriteHandler : ReadWriteHandler
    {
      string xml;

      public XmlReaderReadWriteHandler (XmlReader reader)
      {
        reader.MoveToContent ();
        Name = reader.LocalName;
        Namespace = reader.NamespaceURI;
        xml = reader.ReadOuterXml ();
      }

      public override XmlReader GetReader ()
      {
        var r = XmlReader.Create (new StringReader (xml));
        r.MoveToContent ();
        return r;
      }

      public override void WriteTo (XmlWriter writer)
      {
        writer.WriteNode (GetReader (), false);
      }
    }
  }
}