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// Copyright (c) .NET Foundation and contributors. All rights reserved. Licensed under the Microsoft Reciprocal License. See LICENSE.TXT file in the project root for full license information.
namespace WixToolset.Core.ExtensibilityServices
{
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Reflection;
using WixToolset.Data;
using WixToolset.Extensibility;
using WixToolset.Extensibility.Services;
internal class ExtensionManager : IExtensionManager
{
private List<IExtensionFactory> extensionFactories = new List<IExtensionFactory>();
private Dictionary<Type, List<object>> loadedExtensionsByType = new Dictionary<Type, List<object>>();
public void Add(Assembly extensionAssembly)
{
var types = extensionAssembly.GetTypes().Where(t => !t.IsAbstract && !t.IsInterface && typeof(IExtensionFactory).IsAssignableFrom(t));
var factories = types.Select(t => (IExtensionFactory)Activator.CreateInstance(t)).ToList();
this.extensionFactories.AddRange(factories);
}
public void Load(string extensionPath)
{
Assembly assembly;
// Absolute path to an assembly which means only "load from" will work even though we'd prefer to
// use Assembly.Load (see the documentation for Assembly.LoadFrom why).
if (Path.IsPathRooted(extensionPath))
{
assembly = ExtensionManager.ExtensionLoadFrom(extensionPath);
}
else if (ExtensionManager.TryExtensionLoad(extensionPath, out assembly))
{
// Loaded the assembly by name from the probing path.
}
else if (ExtensionManager.TryExtensionLoad(Path.GetFileNameWithoutExtension(extensionPath), out assembly))
{
// Loaded the assembly by filename alone along the probing path.
}
else // relative path to an assembly
{
// We want to use Assembly.Load when we can because it has some benefits over Assembly.LoadFrom
// (see the documentation for Assembly.LoadFrom). However, it may fail when the path is a relative
// path, so we should try Assembly.LoadFrom one last time. We could have detected a directory
// separator character and used Assembly.LoadFrom directly, but dealing with path canonicalization
// issues is something we don't want to deal with if we don't have to.
assembly = ExtensionManager.ExtensionLoadFrom(extensionPath);
}
this.Add(assembly);
}
public IEnumerable<T> Create<T>() where T : class
{
if (!this.loadedExtensionsByType.TryGetValue(typeof(T), out var extensions))
{
extensions = new List<object>();
foreach (var factory in this.extensionFactories)
{
if (factory.TryCreateExtension(typeof(T), out var obj) && obj is T extension)
{
extensions.Add(extension);
}
}
this.loadedExtensionsByType.Add(typeof(T), extensions);
}
return extensions.Cast<T>().ToList();
}
private static Assembly ExtensionLoadFrom(string assemblyName)
{
try
{
return Assembly.LoadFrom(assemblyName);
}
catch (Exception e)
{
throw new WixException(ErrorMessages.InvalidExtension(assemblyName, e.Message), e);
}
}
private static bool TryExtensionLoad(string assemblyName, out Assembly assembly)
{
try
{
assembly = Assembly.Load(assemblyName);
return true;
}
catch (IOException innerE)
{
if (innerE is FileLoadException || innerE is FileNotFoundException)
{
assembly = null;
return false;
}
throw new WixException(ErrorMessages.InvalidExtension(assemblyName, innerE.Message), innerE);
}
catch (Exception e)
{
throw new WixException(ErrorMessages.InvalidExtension(assemblyName, e.Message), e);
}
}
}
}
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