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//
// ExtensionChain.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.Collections.Generic;
using System.Linq;
namespace MonoDevelop.Projects
{
public class ExtensionChain
{
Dictionary<Type,ChainedExtension> chains = new Dictionary<Type, ChainedExtension> ();
ChainedExtension[] extensions;
public static ExtensionChain Create<T> (T[] extensions) where T:ChainedExtension
{
var c = new ExtensionChain ();
for (int n = extensions.Length - 2; n >= 0; n--)
extensions [n].InitChain (c, extensions [n + 1]);
c.extensions = extensions;
return c;
}
public T GetExtension<T> () where T:ChainedExtension, new()
{
ChainedExtension e;
if (!chains.TryGetValue (typeof(T), out e)) {
e = new T ();
e.InitChain (this, ChainedExtension.FindNextImplementation<T> (extensions[0]));
chains [typeof(T)] = e;
}
return (T)e;
}
public IEnumerable<ChainedExtension> GetAllExtensions ()
{
return extensions;
}
internal void AddExtension (ChainedExtension ext)
{
Array.Resize (ref extensions, extensions.Length + 1);
extensions [extensions.Length - 1] = ext;
Rechain ();
}
internal void RemoveExtension (ChainedExtension ext)
{
extensions = extensions.Where (e => e != ext).ToArray ();
Rechain ();
}
void Rechain ()
{
// Re-chain every extension
for (int n = extensions.Length - 2; n >= 0; n--)
extensions [n].InitChain (this, extensions [n + 1]);
// The first extension object in type-specific chains is a placeholder extension used only to hold
// a reference to the real first extension.
foreach (var fex in chains)
fex.Value.InitChain (this, ChainedExtension.FindNextImplementation (fex.Key, extensions[0]));
}
public void Dispose ()
{
extensions[0].DisposeChain ();
}
}
}
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