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/ DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / fx / src / xsp / System / Web / Compilation / IImplicitResourceProvider.cs / 1 / IImplicitResourceProvider.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //----------------------------------------------------------------------------- namespace System.Web.Compilation { using System; using System.Collections; using System.Collections.Specialized; using System.Reflection; using System.IO; using System.CodeDom; using System.Globalization; using System.Resources; using System.Web.Compilation; using System.Web.Util; using System.Web.UI; using System.Security.Permissions; /* * Interface to access implicit (automatic) page resources */ [AspNetHostingPermission(SecurityAction.LinkDemand, Level=AspNetHostingPermissionLevel.Minimal)] [AspNetHostingPermission(SecurityAction.InheritanceDemand, Level=AspNetHostingPermissionLevel.Minimal)] public interface IImplicitResourceProvider { /* * Retrieve a resource object for the passed in key and culture */ object GetObject(ImplicitResourceKey key, CultureInfo culture); /* * Return a collection of ImplicitResourceKey's for the given prefix */ ICollection GetImplicitResourceKeys(string keyPrefix); } /* * Contains fields which identify a specific implicit resource key */ [AspNetHostingPermission(SecurityAction.LinkDemand, Level=AspNetHostingPermissionLevel.Minimal)] public sealed class ImplicitResourceKey { private string _filter; private string _keyPrefix; private string _property; public ImplicitResourceKey() { } public ImplicitResourceKey(string filter, string keyPrefix, string property) { _filter = filter; _keyPrefix = keyPrefix; _property = property; } /* * The filter, if any */ public string Filter { get { return _filter; } set { _filter = value; } } /* * The prefix, as appears on tag's meta:resourcekey attributes */ public string KeyPrefix { get { return _keyPrefix; } set { _keyPrefix = value; } } /* * The property, possibly including sub-properties (e.g. MyProp.MySubProp) */ public string Property { get { return _property; } set { _property = value; } } } /* * IImplicitResourceProvider implementation on top of an arbitrary IResourceProvider */ internal class DefaultImplicitResourceProvider: IImplicitResourceProvider { private IResourceProvider _resourceProvider; private IDictionary _implicitResources; private bool _attemptedGetPageResources; internal DefaultImplicitResourceProvider(IResourceProvider resourceProvider) { _resourceProvider = resourceProvider; } public virtual object GetObject(ImplicitResourceKey entry, CultureInfo culture) { // Put together the full resource key based on the ImplicitResourceKey string fullResourceKey = ConstructFullKey(entry); // Look it up in the resource provider return _resourceProvider.GetObject(fullResourceKey, culture); } public virtual ICollection GetImplicitResourceKeys(string keyPrefix) { // Try to get the page resources EnsureGetPageResources(); // If there aren't any, return null if (_implicitResources == null) return null; // Return the collection of resources for this key prefix return (ICollection) _implicitResources[keyPrefix]; } /* * Create a dictionary, in which the key is a resource key (as found on meta:resourcekey * attributes), and the value is an ArrayList containing all the resources for that * resource key. Each element of the ArrayList is an ImplicitResourceKey */ internal void EnsureGetPageResources() { // If we already attempted to get them, don't do it again if (_attemptedGetPageResources) return; _attemptedGetPageResources = true; IResourceReader resourceReader = _resourceProvider.ResourceReader; if (resourceReader == null) return; _implicitResources = new Hashtable(StringComparer.OrdinalIgnoreCase); // Enumerate through all the page resources foreach (DictionaryEntry entry in resourceReader) { // Attempt to parse the key into a ImplicitResourceKey ImplicitResourceKey implicitResKey = ParseFullKey((string) entry.Key); // If we couldn't parse it as such, skip it if (implicitResKey == null) continue; // Check if we already have an entry for this resource key prefix ArrayList controlResources = (ArrayList) _implicitResources[implicitResKey.KeyPrefix]; // If not, create one if (controlResources == null) { controlResources = new ArrayList(); _implicitResources[implicitResKey.KeyPrefix] = controlResources; } // Add an entry in the ArrayList for this property controlResources.Add(implicitResKey); } } /* * Parse a complete page resource key into a ImplicitResourceKey. * Return null if the key does not appear to be meant for implict resources. */ private static ImplicitResourceKey ParseFullKey(string key) { string filter = String.Empty; // A page resource key looks like [myfilter:]MyResKey.MyProp[.MySubProp] // Check if there is a filter if (key.IndexOf(':') > 0) { string[] parts = key.Split(':'); // Shouldn't be multiple ':'. If there is, ignore it if (parts.Length > 2) return null; filter = parts[0]; key = parts[1]; } int periodIndex = key.IndexOf('.'); // There should be at least one period, for the meta:resourcekey part. If not, ignore. if (periodIndex <= 0) return null; string keyPrefix = key.Substring(0, periodIndex); // The rest of the string is the property (e.g. MyProp.MySubProp) string property = key.Substring(periodIndex+1); // Create a ImplicitResourceKey with the parsed data ImplicitResourceKey implicitResKey = new ImplicitResourceKey(); implicitResKey.Filter = filter; implicitResKey.KeyPrefix = keyPrefix; implicitResKey.Property = property; return implicitResKey; } private static string ConstructFullKey(ImplicitResourceKey entry) { string key = entry.KeyPrefix + "." + entry.Property; if (entry.Filter.Length > 0) key = entry.Filter + ":" + key; return key; } } }
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