62 lines
2.3 KiB
C#
62 lines
2.3 KiB
C#
// Copyright (c) Microsoft Corporation. All rights reserved. See License.txt in the project root for license information.
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using System.Collections.Generic;
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using System.Linq;
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namespace System.Web.WebPages
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{
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// This class encapsulates the creation of objects from virtual paths. The creation is either performed via BuildBanager API's, or
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// by using explicitly registered factories (which happens through ApplicationPart.Register).
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public class VirtualPathFactoryManager : IVirtualPathFactory
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{
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private static readonly Lazy<VirtualPathFactoryManager> _instance = new Lazy<VirtualPathFactoryManager>(() => new VirtualPathFactoryManager(new BuildManagerWrapper()));
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private readonly LinkedList<IVirtualPathFactory> _virtualPathFactories = new LinkedList<IVirtualPathFactory>();
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internal VirtualPathFactoryManager(IVirtualPathFactory defaultFactory)
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{
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_virtualPathFactories.AddFirst(defaultFactory);
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}
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// Get the VirtualPathFactoryManager singleton instance
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internal static VirtualPathFactoryManager Instance
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{
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get { return _instance.Value; }
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}
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internal IEnumerable<IVirtualPathFactory> RegisteredFactories
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{
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get { return _virtualPathFactories; }
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}
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public static void RegisterVirtualPathFactory(IVirtualPathFactory virtualPathFactory)
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{
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Instance.RegisterVirtualPathFactoryInternal(virtualPathFactory);
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}
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internal void RegisterVirtualPathFactoryInternal(IVirtualPathFactory virtualPathFactory)
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{
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_virtualPathFactories.AddBefore(_virtualPathFactories.Last, virtualPathFactory);
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}
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public bool Exists(string virtualPath)
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{
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return _virtualPathFactories.Any(factory => factory.Exists(virtualPath));
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}
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public object CreateInstance(string virtualPath)
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{
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return CreateInstanceOfType<object>(virtualPath);
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}
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internal T CreateInstanceOfType<T>(string virtualPath) where T : class
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{
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var virtualPathFactory = _virtualPathFactories.FirstOrDefault(f => f.Exists(virtualPath));
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if (virtualPathFactory != null)
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{
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return virtualPathFactory.CreateInstance<T>(virtualPath);
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}
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return null;
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}
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}
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}
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