IImplicitResourceProvider.cs source code in C# .NET

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Code:

                         / 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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