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TypeExtensionNode.cs

//
// TypeExtensionNode.cs
//
// Author:
//   Lluis Sanchez Gual
//
// 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.Xml;

namespace Mono.Addins
{
      [ExtensionNode ("Type", Description="Specifies a class that will be used to create an extension object.")]
      [NodeAttribute ("class", typeof(Type), false, Description="Name of the class. If a value is not provided, the class name will be taken from the 'id' attribute")]
      public class TypeExtensionNode: InstanceExtensionNode
      {
            string typeName;
            
            internal protected override void Read (NodeElement elem)
            {
                  base.Read (elem);
                  typeName = elem.GetAttribute ("type");
                  if (typeName.Length == 0)
                        typeName = elem.GetAttribute ("class");
                  if (typeName.Length == 0)
                        typeName = elem.GetAttribute ("id");
            }
            
            public override object CreateInstance ()
            {
                  if (typeName.Length == 0)
                        throw new InvalidOperationException ("Type name not specified.");

                  Type t = Addin.GetType (typeName, true);
                  return Activator.CreateInstance (t);
            }
      }
}

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