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//
// ChainedExtension.cs
//
// Author:
// Lluis Sanchez Gual <lluis@xamarin.com>
//
// Copyright (c) 2014 Xamarin, Inc (http://www.xamarin.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.Reflection;
using System.Linq;
using System.Collections.Generic;
namespace MonoDevelop.Projects
{
public class ChainedExtension: IDisposable
{
ChainedExtension nextInChain;
internal protected static T FindNextImplementation<T> (ChainedExtension next) where T:class
{
if (next == null)
return null;
var nextT = next as T;
if (nextT == null)
return FindNextImplementation<T> (next.nextInChain);
foreach (var m in typeof(T).GetMembers (BindingFlags.DeclaredOnly | BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.Instance)) {
MethodInfo method = m as MethodInfo;
if (method == null) {
var prop = m as PropertyInfo;
if (prop != null) {
method = prop.GetGetMethod ();
if (method == null)
method = prop.GetSetMethod ();
}
}
if (method != null && method.IsVirtual && method.Name != "InitializeChain") {
var tm = next.GetType ().GetMethod (method.Name, BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.Instance, null, method.GetParameters ().Select (p=>p.ParameterType).ToArray (), null);
if (tm == null)
continue;
if (tm.DeclaringType != typeof(T))
return nextT;
}
}
return FindNextImplementation<T> (next.nextInChain);
}
internal void Init (ChainedExtension next)
{
nextInChain = next;
InitializeChain (next);
}
internal protected virtual void InitializeChain (ChainedExtension next)
{
}
internal ChainedExtension Next {
get { return nextInChain; }
}
internal void DisposeChain ()
{
Dispose ();
if (nextInChain != null)
nextInChain.DisposeChain ();
}
public virtual void Dispose ()
{
}
}
}
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