Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / xsp / System / Extensions / UI / WebResourceUtil.cs / 1305376 / WebResourceUtil.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //----------------------------------------------------------------------------- namespace System.Web.UI { using System; using System.Collections; using System.Collections.Generic; using System.Diagnostics; using System.Linq; using System.Globalization; using System.Reflection; using System.Web.UI; using System.Web.Resources; using System.Web.Util; internal static class WebResourceUtil { // Maps Pair(resourceName, assembly) to bool private static readonly Hashtable _assemblyContainsWebResourceCache = Hashtable.Synchronized(new Hashtable()); private static readonly FastStringLookupTable _systemWebExtensionsCache = CreateSystemWebExtensionsCache(); // Returns true if the assembly contains a Web resource and an embedded resource with // the sepecified name. Throws exception if assembly contains Web resource but no // embedded resource, since this is always an error. public static bool AssemblyContainsWebResource(Assembly assembly, string resourceName) { // PERF: Special-case known resources in our own assembly if (assembly == AssemblyCache.SystemWebExtensions) { return _systemWebExtensionsCache.Contains(resourceName); } // Getting and checking the custom attributes is expensive, so we cache the result // of the lookup. Pair key = new Pair (resourceName, assembly); object assemblyContainsWebResource = _assemblyContainsWebResourceCache[key]; if (assemblyContainsWebResource == null) { assemblyContainsWebResource = false; object[] attrs = assembly.GetCustomAttributes(typeof(WebResourceAttribute), false); foreach (WebResourceAttribute attr in attrs) { // Resource names are always case-sensitive if (String.Equals(attr.WebResource, resourceName, StringComparison.Ordinal)) { if (assembly.GetManifestResourceStream(resourceName) != null) { assemblyContainsWebResource = true; break; } else { // Always an error to contain Web resource but not embedded resource. throw new InvalidOperationException(String.Format( CultureInfo.CurrentUICulture, AtlasWeb.WebResourceUtil_AssemblyDoesNotContainEmbeddedResource, assembly, resourceName)); } } } _assemblyContainsWebResourceCache[key] = assemblyContainsWebResource; } return (bool)assemblyContainsWebResource; } private static FastStringLookupTable CreateSystemWebExtensionsCache() { Assembly assembly = AssemblyCache.SystemWebExtensions; object[] attrs = assembly.GetCustomAttributes(typeof(WebResourceAttribute), false); var resourceNames = from WebResourceAttribute attr in attrs select attr.WebResource; return new FastStringLookupTable(resourceNames); } // Throws exception if the assembly does not contain a Web resource and an embedded resource // with the specified name. public static void VerifyAssemblyContainsReleaseWebResource(Assembly assembly, string releaseResourceName, Assembly currentAjaxAssembly) { if (!AssemblyContainsWebResource(assembly, releaseResourceName)) { string errorMessage; if (assembly == AssemblyCache.SystemWebExtensions) { errorMessage = String.Format( CultureInfo.CurrentUICulture, AtlasWeb.WebResourceUtil_SystemWebExtensionsDoesNotContainReleaseWebResource, currentAjaxAssembly ?? assembly, releaseResourceName); } else { errorMessage = String.Format( CultureInfo.CurrentUICulture, AtlasWeb.WebResourceUtil_AssemblyDoesNotContainReleaseWebResource, assembly, releaseResourceName); } throw new InvalidOperationException(errorMessage); } } // Throws exception if the assembly does not contain a Web resource and an embedded resource // with the specified name. public static void VerifyAssemblyContainsDebugWebResource(Assembly assembly, string debugResourceName) { if (!AssemblyContainsWebResource(assembly, debugResourceName)) { throw new InvalidOperationException(String.Format( CultureInfo.CurrentUICulture, AtlasWeb.WebResourceUtil_AssemblyDoesNotContainDebugWebResource, assembly, debugResourceName)); } } private class FastStringLookupTable { // PERF: Switching over the length is more performant than switching over the string itself // or checking equality against each string. When switching over the string itself, the switch // is compiled to a lookup in a static Dictionary , which is 5-10 times slower than // switching over the length. Checking equality against each string ranges from equal performance // to 10 times slower, depending on how early a match is found. private readonly string[][] _table; public FastStringLookupTable(IEnumerable strings) { int longest = (from s in strings orderby s.Length descending select s.Length).First(); _table = new string[longest + 1][]; var groups = from s in strings group s by s.Length into g select g; foreach (var g in groups) { _table[g.Key] = g.ToArray(); } } public bool Contains(string s) { if (String.IsNullOrEmpty(s)) { return false; } if (s.Length >= _table.Length) { return false; } string[] strings = _table[s.Length]; if (strings == null) { return false; } for (int i = 0; i < strings.Length; i++) { if (s == strings[i]) { return true; } } return false; } } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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