mcs/class/System.Web/System.Web.UI.WebControls/AdRotator.cs

   1 /**\r
   2  * Namespace: System.Web.UI.WebControls\r
   3  * Class:     AdRotator\r
   4  * \r
   5  * Author:  Gaurav Vaish\r
   6  * Contact: <gvaish@iitk.ac.in>\r
   7  * Status:  10??%\r
   8  * \r
   9  * (C) Gaurav Vaish (2001)\r
  10  */\r
  11 \r
  12 using System;\r
  13 using System.IO;\r
  14 using System.Collections;\r
  15 using System.Collections.Specialized;\r
  16 using System.Web;\r
  17 using System.Web.UI;\r
  18 using System.Xml;\r
  19 \r
  20 namespace System.Web.UI.WebControls\r
  21 {\r
  22         public class AdRotator: WebControl\r
  23         {\r
  24 \r
  25                 private string advertisementFile;\r
  26                 private string keywordFilter;\r
  27                 private string target;\r
  28                 private static readonly object AdCreatedEvent = new object();\r
  29 \r
  30                 // Will be set values during (On)PreRender-ing\r
  31                 private string alternateText;\r
  32                 private string imageUrl;\r
  33                 private string navigateUrl;\r
  34 \r
  35                 private string fileDirctory;\r
  36 \r
  37                 private static class AdRecord\r
  38                 {\r
  39                         public IDictionary adProps;\r
  40                         public int         hits; // or impressions or clicks\r
  41                         public string      keyword;\r
  42 \r
  43                         public AdRecord()\r
  44                         {\r
  45                         }\r
  46                         \r
  47                         public void Initialize(IDictionary adProps)\r
  48                         {\r
  49                                 this.adProps = adProps;\r
  50                         }\r
  51                 }\r
  52 \r
  53 /*\r
  54  * Loading / Saving data from/to ad file and all the manipulations wrt to the URL...\r
  55  * are incorporated by the following functions.\r
  56  * GetData(string)\r
  57  * LoadAdFile(string)\r
  58  * IsAdMatching(AdRecord)\r
  59  * ResolveAdUrl(string)\r
  60  * SelectAd()\r
  61  * The exact control flow will be detailed. Let me first write the functions\r
  62  */\r
  63 \r
  64                 private AdRecord[] LoadAdFile(string file)\r
  65                 {\r
  66                         //TODO: Implement me\r
  67                         Stream      fSream;\r
  68                         ArrayList   list;\r
  69                         XmlReader   reader;\r
  70                         XmlDocument document;\r
  71                         XmlNode     topNode, innerNode;\r
  72                         IDictionary hybridDict;\r
  73                         AdRecord[]  adsArray = null;\r
  74                         try\r
  75                         {\r
  76                                 fStream = new FileStream(file, FileMode.Open, FileAccess.Read, FileShare.Read);\r
  77                         } catch(Exception e)\r
  78                         {\r
  79                                 throw new HttpException("AdRotator: Unable to open file");\r
  80                         }\r
  81                         try\r
  82                         {\r
  83                                 list = new ArrayList();\r
  84                                 reader = new XmlTextReader(fStream);\r
  85                                 document = new XmlDocument();\r
  86                                 document.Load(reader);\r
  87                                 if(document.DocumentElement!=null)\r
  88                                 {\r
  89                                         if(docuent.DocumentElement.LocalName=="Advertisements")\r
  90                                         {\r
  91                                                 topNode = documentElement.FirstChild;\r
  92                                                 while(topNode!=null)\r
  93                                                 {\r
  94                                                         if(topNode.LocalName=="Ad")\r
  95                                                         {\r
  96                                                                 innerNode = topNode.FirstChild;\r
  97                                                                 while(innerNode!=null)\r
  98                                                                 {\r
  99                                                                         if(innerNode.NodeType==NodeType.Element)\r
 100                                                                         {\r
 101                                                                                 if(hybridDic==null)\r
 102                                                                                 {\r
 103                                                                                         hybirdDict = new HybridDictionary();\r
 104                                                                                 }\r
 105                                                                                 hybridDic.Add(innerNode.LocalName, innerNode.InnerText);\r
 106                                                                         }\r
 107                                                                         innerNode = innerNode.NextSibling;\r
 108                                                                 }\r
 109                                                                 if(hybridDict!=null)\r
 110                                                                         list.Add(hybridDict);\r
 111                                                         }\r
 112                                                         topNode = topNode.NextSibling;\r
 113                                                 }\r
 114                                         }\r
 115                                 }\r
 116                                 if(list.Count>0)\r
 117                                 {\r
 118                                         adsArray = new AdRecord[list.Count];\r
 119                                         for(int i=0; i < list.Count; i++)\r
 120                                         {\r
 121                                                 adsArray[i] = new AdRecord((IDictionary)list.Item[i]);\r
 122                                         }\r
 123                                 }\r
 124                         } catch(Excetion e)\r
 125                         {\r
 126                                 //TODO: Write error. Parsing error has occured\r
 127                                 throw new HttpException("AdRotator: Unable to parse file" + file);\r
 128                         } finally\r
 129                         {\r
 130                                 fStream.close();\r
 131                         }\r
 132                         if(adsArray == null)\r
 133                         {\r
 134                                 throw new HttpException("AdRotator: No Advertisements Fount");\r
 135                         }\r
 136                         return adsArray;\r
 137                 }\r
 138                 \r
 139                 private AdRecord[] GetData(string file)\r
 140                 {\r
 141                         //TODO: Implement me\r
 142                         fileDirectory = TemplateSourceDirectory + MapPathSecure(file);\r
 143                         //TODO: Do I need to check caching?\r
 144                 }\r
 145                 \r
 146                 private IDictionary SelectAd()\r
 147                 {\r
 148                         //TODO: Implement Me\r
 149                 }\r
 150                 \r
 151                 private bool IsAdMatching(AdRecord currAd)\r
 152                 {\r
 153                         //TODO: Implement me\r
 154                 }\r
 155                 \r
 156                 private string ResolveAdUrl(string)\r
 157                 {\r
 158                         //TODO: Implement me\r
 159                 }\r
 160                 \r
 161                 public event AdCreatedEventHandler AdCreated\r
 162                 {\r
 163                         add\r
 164                         {\r
 165                                 Events.AddHandler(AdCreatedEvent, value);\r
 166                         }\r
 167                         remove\r
 168                         {\r
 169                                 Events.RemoveHandler(AdCreatedEvent, value);\r
 170                         }\r
 171                 }\r
 172                 \r
 173                 public AdRotator()\r
 174                 {\r
 175                         base();\r
 176                         advertisementFile = string.Empty;\r
 177                         keywordFilter     = string.Empty;\r
 178                         target            = string.Empty;\r
 179                 }\r
 180                 \r
 181                 public string AdvertisementFile\r
 182                 {\r
 183                         get\r
 184                         {\r
 185                                 return advertisementFile;\r
 186                         }\r
 187                         set\r
 188                         {\r
 189                                 advertisementFile = value;\r
 190                         }\r
 191                 }\r
 192                 \r
 193                 public string KeywordFilter\r
 194                 {\r
 195                         get\r
 196                         {\r
 197                                 return keywordFilter;\r
 198                         }\r
 199                         set\r
 200                         {\r
 201                                 keywordFilter = value;\r
 202                         }\r
 203                 }\r
 204                 \r
 205                 public string Target\r
 206                 {\r
 207                         get\r
 208                         {\r
 209                                 return target;\r
 210                         }\r
 211                         set\r
 212                         {\r
 213                                 target = value;\r
 214                         }\r
 215                 }\r
 216                 \r
 217                 protected override ControlCollection CreateControlCollection()\r
 218                 {\r
 219                         return new EmptyControlCollection(this);\r
 220                 }\r
 221                 \r
 222                 protected virtual void OnAdCreated(AdCreatedEventArgs e)\r
 223                 {\r
 224                         if(Events!=null)\r
 225                         {\r
 226                                 AdCreatedEventHandler aceh = (AdCreatedEventHandler)(Events[AdCreatedEvent]);\r
 227                                 if(aceh!=null)\r
 228                                         aceh(this, e);\r
 229                         }\r
 230                 }\r
 231 \r
 232                 protected override void OnPreRender(EventArgs e)\r
 233                 {\r
 234                         if(AdvertisementFile!=String.Empty)\r
 235                         {\r
 236                                 AdCreatedEventArgs acea = new AdCreatedEventArgs(SelectAd());\r
 237                                 imageUrl      = acea.ImageUrl;\r
 238                                 navigateUrl   = acea.NavigateUrl;\r
 239                                 alternateText = acea.AlternateText;\r
 240                         }\r
 241                 }\r
 242                 \r
 243                 protected override void Render(HtmlTextWriter writer)\r
 244                 {\r
 245                         HyperLink hLink = new HyperLink();\r
 246                         Image     image;\r
 247 \r
 248                         AttributeCollection attributeColl = base.Attributes;\r
 249                         ICollection keys = attributeColl.Keys;\r
 250                         IEnumerator iterator = keys.GetEnumerator();\r
 251                         \r
 252                         \r
 253                 }\r
 254         }\r
 255 }\r