configurationrewrite.cs

ajax patterns 这是关于ajax设计模式方面的原代码

/*
    Copyright 2006 Christian Gross http://www.devspace.com
    From the book Ajax Patterns and Best Practices

   Licensed under the Apache License, Version 2.0 (the "License");
   you may not use this file except in compliance with the License.
   You may obtain a copy of the License at

       http://www.apache.org/licenses/LICENSE-2.0

   Unless required by applicable law or agreed to in writing, software
   distributed under the License is distributed on an "AS IS" BASIS,
   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   See the License for the specific language governing permissions and
   limitations under the License.
*/
using System;
using System.Reflection;
using System.Web;
using System.Collections;
using System.Collections.Generic;
using Devspace.Commons.Tracer;

namespace Devspace.Ajax.Permutations {
    public class AssemblyLoader {
        Assembly _assembly;
        
        public AssemblyLoader(string path) {
            _assembly = Assembly.Load(AssemblyName.GetAssemblyName(path));
        }
        public type Instantiate< type>(string typeidentifier) where type: class {
            return _assembly.CreateInstance(typeidentifier) as type;
        }
    }
    
    // This class is the start of a dynamic configuration base URL rewriter
    public class ConfigurationRewrite : IURLRewriter {
        HttpApplication _app;
        HttpContext _context;
        private const string constAssemblyPath = @"/home/cgross/ajax/patterns/website/ROOT/assemblies/devspace.ajax.dll";
        private SortedList< string, string> _handlerIdentifiers = new SortedList< string, string>();
        
        public ConfigurationRewrite( HttpApplication app) {
            _app = app;
            _context = app.Context;
            _handlerIdentifiers.Add( "/cachecontroller/etagexample1", "Devspace.Ajax.CacheController.ETagExample1");
            _handlerIdentifiers.Add( "/cachecontroller/etagexample2", "Devspace.Ajax.CacheController.ETagExample2");
            _handlerIdentifiers.Add( "/persistentcommunications/globalstatus", "Devspace.Ajax.PersistentCommunications.GlobalStatus");
            _handlerIdentifiers.Add( "/persistentcommunications/globalpresence", "Devspace.Ajax.PersistentCommunications.GlobalPresence");
            _handlerIdentifiers.Add( "/persistentcommunications/globalserverpush", "Devspace.Ajax.PersistentCommunications.GlobalServerPush");
            _handlerIdentifiers.Add( "/decouplednavigation/convertcase", "Devspace.Ajax.DecoupledNavigation.ConvertCase");
            _handlerIdentifiers.Add( "/infinitedata/primenumbercalculator", "Devspace.Ajax.InfiniteData.PrimeNumberHandler");
            _handlerIdentifiers.Add( "/restmvc/dotranslation", "Devspace.Ajax.RestMVC.Translation.TranslationHandler");
            _handlerIdentifiers.Add( "/logging/message", "Devspace.Ajax.Logging.LogBuffer");
        }
        public bool IsResource(HttpRequest request) {
            string type;
            GenerateOutput.Write( "ConfigurationRewrite.IsResource", "Path (" + request.Path + ")");
            if( _handlerIdentifiers.TryGetValue( request.Path, out type)) {
                GenerateOutput.Write( "ConfigurationRewrite.IsResource", "Found a handler");
                return true;
            }
            else {
                GenerateOutput.Write( "ConfigurationRewrite.IsResource", "Checking if the URL (" + request.Path + ") is embedded");
                foreach( KeyValuePair< string, string> value in _handlerIdentifiers) {
                    GenerateOutput.Write( "ConfigurationRewrite.IsResource",
                                         "Key (" + value.Key + ") Value (" + value.Value + ")");
                    if( request.Path.Contains( value.Key)) {
                        GenerateOutput.Write( "ConfigurationRewrite.IsResource", "Found a handler that contains the URL");
                        return true;
                    }
                }
                GenerateOutput.Write( "ConfigurationRewrite.IsResource", "Handler could not be found");
                return false;
            }
        }
        
        public void WriteRepresentation(HttpRequest request) {
            string type;
            GenerateOutput.Write( "ConfigurationRewrite.WriteRepresentation", "Path (" + request.Path + ")");
            if( !_handlerIdentifiers.TryGetValue( request.Path, out type)) {
                foreach( KeyValuePair< string, string> value in _handlerIdentifiers) {
                    if( request.Path.Contains( value.Key)) {
                        type = value.Value;
                        break;
                    }
                }
            }
            IHttpHandler handler = new AssemblyLoader( constAssemblyPath)
                .Instantiate< IHttpHandler>( type);
            if( handler != null) {
                GenerateOutput.Write( "ConfigurationRewrite.WriteRepresentation", "Executing handler");
                handler.ProcessRequest( _context);
                _app.CompleteRequest();
            }
            else {
                GenerateOutput.Write( "ConfigurationRewrite.WriteRepresentation", "Handler could not be executed");
            }
        }
        
    }
}


/*IHttpHandler IsMagicFile( string mimeType, string filename) {
if( filename == ".aspx") {
string type = "";
bool retval = false;
if( _context.Request.Path == "/cachecontroller/etagexample1") {
type = "Devspace.Ajax.CacheController.ETagExample1";
retval = true;
}
else if( _context.Request.Path == "/cachecontroller/etagexample2") {
type = "Devspace.Ajax.CacheController.ETagExample2";
retval = true;
}
if( retval) {
GenerateOutput.Write("SlashPeriodRewriter.IsMagicFile",
"Ooowee magic file (" + _context.Request.Path + ") mime (" + mimeType +
") filename (" + filename + ")");
return new AssemblyLoader(constAssemblyPath).Instantiate<IHttpHandler>(type);
}
}
return null;
}*/