Code:
/ DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / fx / src / xsp / System / Web / Compilation / ResourceExpressionBuilder.cs / 1 / ResourceExpressionBuilder.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //----------------------------------------------------------------------------- namespace System.Web.Compilation { using System; using System.Security.Permissions; using System.Collections; using System.Collections.Specialized; using System.CodeDom; using System.ComponentModel; using System.Globalization; using System.IO; using System.Reflection; using System.Resources; using System.Web.Caching; using System.Web.Compilation; using System.Web.Configuration; using System.Web.Hosting; using System.Web.Util; using System.Web.UI; [ExpressionPrefix("Resources")] [ExpressionEditor("System.Web.UI.Design.ResourceExpressionEditor, " + AssemblyRef.SystemDesign)] [AspNetHostingPermission(SecurityAction.LinkDemand, Level = AspNetHostingPermissionLevel.Minimal)] [AspNetHostingPermission(SecurityAction.InheritanceDemand, Level = AspNetHostingPermissionLevel.Minimal)] public class ResourceExpressionBuilder : ExpressionBuilder { private static ResourceProviderFactory s_resourceProviderFactory; public override bool SupportsEvaluate { get { return true; } } public static ResourceExpressionFields ParseExpression(string expression) { return ParseExpressionInternal(expression); } public override object ParseExpression(string expression, Type propertyType, ExpressionBuilderContext context) { ResourceExpressionFields fields = null; try { fields = ParseExpressionInternal(expression); } catch { } // If the parsing failed for any reason throw an error if (fields == null) { throw new HttpException( SR.GetString(SR.Invalid_res_expr, expression)); } // The resource expression was successfully parsed. We now need to check whether // the resource object actually exists in the neutral culture // If we don't have a virtual path, we can't check that the resource exists. // This happens in the designer. if (context.VirtualPathObject != null) { IResourceProvider resourceProvider = GetResourceProvider(fields, VirtualPath.Create(context.VirtualPath)); object o = null; if (resourceProvider != null) { try { o = resourceProvider.GetObject(fields.ResourceKey, CultureInfo.InvariantCulture); } catch {} } // If it doesn't throw an exception if (o == null) { throw new HttpException( SR.GetString(SR.Res_not_found, fields.ResourceKey)); } } return fields; } public override CodeExpression GetCodeExpression(BoundPropertyEntry entry, object parsedData, ExpressionBuilderContext context) { // Retrieve our parsed data ResourceExpressionFields fields = (ResourceExpressionFields) parsedData; // If there is no classKey, it's a page-level resource if (fields.ClassKey.Length == 0) { return GetPageResCodeExpression(fields.ResourceKey, entry); } // Otherwise, it's a global resource return GetAppResCodeExpression(fields.ClassKey, fields.ResourceKey, entry); } public override object EvaluateExpression(object target, BoundPropertyEntry entry, object parsedData, ExpressionBuilderContext context) { // Retrieve our parsed data ResourceExpressionFields fields = (ResourceExpressionFields) parsedData; IResourceProvider resourceProvider = GetResourceProvider(fields, context.VirtualPathObject); if (entry.Type == typeof(string)) return GetResourceObject(resourceProvider, fields.ResourceKey, null /*culture*/); // If the property is not of type string, pass in extra information // so that the resource value will be converted to the right type return GetResourceObject(resourceProvider, fields.ResourceKey, null /*culture*/, entry.DeclaringType, entry.PropertyInfo.Name); } private CodeExpression GetAppResCodeExpression(string classKey, string resourceKey, BoundPropertyEntry entry) { // We generate the following // this.GetGlobalResourceObject(classKey) CodeMethodInvokeExpression expr = new CodeMethodInvokeExpression(); expr.Method.TargetObject = new CodeThisReferenceExpression(); expr.Method.MethodName = "GetGlobalResourceObject"; expr.Parameters.Add(new CodePrimitiveExpression(classKey)); expr.Parameters.Add(new CodePrimitiveExpression(resourceKey)); // If the property is not of type string, it will need to be converted if (entry.Type != typeof(string) && entry.Type != null) { expr.Parameters.Add(new CodeTypeOfExpression(entry.DeclaringType)); expr.Parameters.Add(new CodePrimitiveExpression(entry.PropertyInfo.Name)); } return expr; } private CodeExpression GetPageResCodeExpression(string resourceKey, BoundPropertyEntry entry) { // We generate of the following // this.GetLocalResourceObject(resourceKey) CodeMethodInvokeExpression expr = new CodeMethodInvokeExpression(); expr.Method.TargetObject = new CodeThisReferenceExpression(); expr.Method.MethodName = "GetLocalResourceObject"; expr.Parameters.Add(new CodePrimitiveExpression(resourceKey)); // If the property is not of type string, it will need to be converted if (entry.Type != typeof(string) && entry.Type != null) { expr.Parameters.Add(new CodeTypeOfExpression(entry.DeclaringType)); expr.Parameters.Add(new CodePrimitiveExpression(entry.PropertyInfo.Name)); } return expr; } internal static object GetGlobalResourceObject(string classKey, string resourceKey) { return GetGlobalResourceObject(classKey, resourceKey, null /*objType*/, null /*propName*/, null /*culture*/); } internal static object GetGlobalResourceObject(string classKey, string resourceKey, Type objType, string propName, CultureInfo culture) { IResourceProvider resourceProvider = GetGlobalResourceProvider(classKey); return GetResourceObject(resourceProvider, resourceKey, culture, objType, propName); } internal static object GetResourceObject(IResourceProvider resourceProvider, string resourceKey, CultureInfo culture) { return GetResourceObject(resourceProvider, resourceKey, culture, null /*objType*/, null /*propName*/); } internal static object GetResourceObject(IResourceProvider resourceProvider, string resourceKey, CultureInfo culture, Type objType, string propName) { if (resourceProvider == null) return null; object o = resourceProvider.GetObject(resourceKey, culture); // If no objType/propName was provided, return the object as is if (objType == null) return o; // Also, if the object from the resource is not a string, return it as is string s = o as String; if (s == null) return o; // If they were provided, perform the appropriate conversion return ObjectFromString(s, objType, propName); } private static object ObjectFromString(string value, Type objType, string propName) { // Get the PropertyDescriptor for the property PropertyDescriptor pd = TypeDescriptor.GetProperties(objType)[propName]; Debug.Assert(pd != null); if (pd == null) return null; // Get its type descriptor TypeConverter converter = pd.Converter; Debug.Assert(converter != null); if (converter == null) return null; // Perform the conversion return converter.ConvertFromInvariantString(value); } // The following syntaxes are accepted for the expression // resourceKey // classKey, resourceKey // private static ResourceExpressionFields ParseExpressionInternal(string expression) { string classKey = null; string resourceKey = null; int len = expression.Length; if (len == 0) { return new ResourceExpressionFields(classKey, resourceKey); } // Split the comma separated string string[] parts = expression.Split(','); int numOfParts = parts.Length; if (numOfParts > 2) return null; if (numOfParts == 1) { resourceKey = parts[0].Trim(); } else { classKey = parts[0].Trim(); resourceKey = parts[1].Trim(); } return new ResourceExpressionFields(classKey, resourceKey); } private static IResourceProvider GetResourceProvider(ResourceExpressionFields fields, VirtualPath virtualPath) { // If there is no classKey, it's a page-level resource if (fields.ClassKey.Length == 0) { return GetLocalResourceProvider(virtualPath); } // Otherwise, it's a global resource return GetGlobalResourceProvider(fields.ClassKey); } private static void EnsureResourceProviderFactory() { if (s_resourceProviderFactory != null) return; Type t = null; GlobalizationSection globConfig = RuntimeConfig.GetAppConfig().Globalization; t = globConfig.ResourceProviderFactoryTypeInternal; // If we got a type from config, use it. Otherwise, use default factory if (t == null) { s_resourceProviderFactory = new ResXResourceProviderFactory(); } else { s_resourceProviderFactory = (ResourceProviderFactory) HttpRuntime.CreatePublicInstance(t); } } private static IResourceProvider GetGlobalResourceProvider(string classKey) { string fullClassName = BaseResourcesBuildProvider.DefaultResourcesNamespace + "." + classKey; // If we have it cached, return it CacheInternal cacheInternal = System.Web.HttpRuntime.CacheInternal; string cacheKey = CacheInternal.PrefixResourceProvider + fullClassName; IResourceProvider resourceProvider = cacheInternal[cacheKey] as IResourceProvider; if (resourceProvider != null) { return resourceProvider; } EnsureResourceProviderFactory(); resourceProvider = s_resourceProviderFactory.CreateGlobalResourceProvider(classKey); // Cache it cacheInternal.UtcInsert(cacheKey, resourceProvider); return resourceProvider; } // Get the page-level IResourceProvider internal static IResourceProvider GetLocalResourceProvider(TemplateControl templateControl) { return GetLocalResourceProvider(templateControl.VirtualPath); } // Get the page-level IResourceProvider internal static IResourceProvider GetLocalResourceProvider(VirtualPath virtualPath) { // If we have it cached, return it (it may be null if there are no local resources) CacheInternal cacheInternal = System.Web.HttpRuntime.CacheInternal; string cacheKey = CacheInternal.PrefixResourceProvider + virtualPath.VirtualPathString; IResourceProvider resourceProvider = cacheInternal[cacheKey] as IResourceProvider; if (resourceProvider != null) { return resourceProvider; } EnsureResourceProviderFactory(); resourceProvider = s_resourceProviderFactory.CreateLocalResourceProvider(virtualPath.VirtualPathString); // Cache it cacheInternal.UtcInsert(cacheKey, resourceProvider); return resourceProvider; } // Create a ResourceExpressionFields without actually parsing any string. This // is used for 'automatic' resources, where we already have the pieces of // relevant data. internal static object GetParsedData(string resourceKey) { return new ResourceExpressionFields(String.Empty, resourceKey); } } // Holds the fields parsed from a resource expression (e.g. classKey, resourceKey) [AspNetHostingPermission(SecurityAction.LinkDemand, Level=AspNetHostingPermissionLevel.Minimal)] public sealed class ResourceExpressionFields { private string _classKey; private string _resourceKey; internal ResourceExpressionFields(string classKey, string resourceKey) { _classKey = classKey; _resourceKey = resourceKey; } public string ClassKey { get { if (_classKey == null) { return String.Empty; } return _classKey; } } public string ResourceKey { get { if (_resourceKey == null) { return String.Empty; } return _resourceKey; } } } }
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