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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. The name of the class can be provided in the 'class' attribute. If 'class' is not provided, the name will be taken from the 'id' attribute")]
      [NodeAttribute ("class", typeof(Type), false, Description="Name of the class")]
      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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