irc/TechBot/TechBot.Library/HresultCommand.cs

   1 using System;
   2 using System.Xml;
   3
   4 namespace TechBot.Library
   5 {
   6         public class HresultCommand : BaseCommand, ICommand
   7         {
   8                 private IServiceOutput serviceOutput;
   9                 private string hresultXml;
  10                 private XmlDocument hresultXmlDocument;
  11
  12                 public HresultCommand(IServiceOutput serviceOutput,
  13                                       string hresultXml)
  14                 {
  15                         this.serviceOutput = serviceOutput;
  16                         this.hresultXml = hresultXml;
  17                         hresultXmlDocument = new XmlDocument();
  18                         hresultXmlDocument.Load(hresultXml);
  19                 }
  20
  21                 public bool CanHandle(string commandName)
  22                 {
  23                         return CanHandle(commandName,
  24                                          new string[] { "hresult" });
  25                 }
  26
  27                 public void Handle(MessageContext context,
  28                                    string commandName,
  29                                    string parameters)
  30                 {
  31                         string hresultText = parameters;
  32                         if (hresultText.Equals(String.Empty))
  33                         {
  34                                 serviceOutput.WriteLine(context,
  35                                                         "Please provide a valid HRESULT value.");
  36                                 return;
  37                         }
  38
  39                         NumberParser np = new NumberParser();
  40                         long hresult = np.Parse(hresultText);
  41                         if (np.Error)
  42                         {
  43                                 serviceOutput.WriteLine(context,
  44                                                         String.Format("{0} is not a valid HRESULT value.",
  45                                                                       hresultText));
  46                                 return;
  47                         }
  48
  49                         string description = GetHresultDescription(hresult);
  50                         if (description != null)
  51                         {
  52                                 serviceOutput.WriteLine(context,
  53                                                         String.Format("{0} is {1}.",
  54                                                                       hresultText,
  55                                                                       description));
  56                         }
  57                         else
  58                         {
  59                                 serviceOutput.WriteLine(context,
  60                                                         String.Format("I don't know about HRESULT {0}.",
  61                                                                       hresultText));
  62                         }
  63                 }
  64
  65                 public string Help()
  66                 {
  67                         return "!hresult <value>";
  68                 }
  69
  70                 private string GetHresultDescription(long hresult)
  71                 {
  72                         XmlElement root = hresultXmlDocument.DocumentElement;
  73                         XmlNode node = root.SelectSingleNode(String.Format("Hresult[@value='{0}']",
  74                                                                            hresult.ToString("X8")));
  75                         if (node != null)
  76                         {
  77                                 XmlAttribute text = node.Attributes["text"];
  78                                 if (text == null)
  79                                         throw new Exception("Node has no text attribute.");
  80                                 return text.Value;
  81                         }
  82                         else
  83                                 return null;
  84                 }
  85         }
  86 }