mcs/class/System.Web/System.Web.Caching/CachedVaryBy.cs

   1 //
   2 // System.Web.Caching.CachedVaryBy
   3 //
   4 // Author(s):
   5 //  Jackson Harper (jackson@ximian.com)
   6 //
   7 // (C) 2003 Novell, Inc (http://www.novell.com)
   8 //
   9
  10
  11 using System;
  12 using System.Text;
  13
  14 namespace System.Web.Caching {
  15
  16         internal class CachedVaryBy {
  17
  18                 private string[] prms;
  19                 private string[] headers;
  20                 private string custom;
  21
  22                 internal CachedVaryBy (HttpCachePolicy policy)
  23                 {
  24                         prms = policy.VaryByParams.GetParamNames ();
  25                         headers = policy.VaryByHeaders.GetHeaderNames ();
  26                         custom = policy.GetVaryByCustom ();
  27                 }
  28
  29                 internal string CreateKey (string file_path, HttpContext context)
  30                 {
  31                         StringBuilder builder = new StringBuilder ();
  32                         HttpApplication app = context.ApplicationInstance;
  33                         HttpRequest request = context.Request;
  34
  35                         builder.Append ("CachedRawResponse\n");
  36                         builder.Append (file_path);
  37                         builder.Append ('\n');
  38                         builder.Append ("METHOD:" + request.HttpMethod);
  39                         builder.Append ('\n');
  40
  41                         if (prms != null) {
  42                                 for (int i=0; i<prms.Length; i++) {
  43                                         if (request.Params [prms [i]] == null)
  44                                                 continue;
  45                                         builder.Append ("VP:");
  46                                         builder.Append (prms [i]);
  47                                         builder.Append ('=');
  48                                         builder.Append (request.Params [prms [i]]);
  49                                         builder.Append ('\n');
  50                                 }
  51                         }
  52
  53                         if (headers != null) {
  54                                 for (int i=0; i<headers.Length; i++) {
  55                                         builder.Append ("VH:");
  56                                         builder.Append (headers [i]);
  57                                         builder.Append ('=');
  58                                         builder.Append (request.Headers [headers [i]]);
  59                                         builder.Append ('\n');
  60                                 }
  61                         }
  62
  63                         if (custom != null) {
  64                                 string s = app.GetVaryByCustomString (context, custom);
  65                                 builder.Append ("VC:");
  66                                 builder.Append (custom);
  67                                 builder.Append ('=');
  68                                 builder.Append (s != null ? s : "__null__");
  69                                 builder.Append ('\n');
  70                         }
  71
  72                         return builder.ToString ();
  73                 }
  74         }
  75 }
  76