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(string commandName,
  28                                    string parameters)
  29                 {
  30                         string hresultText = parameters;
  31                         if (hresultText.Equals(String.Empty))
  32                         {
  33                                 serviceOutput.WriteLine("Please provide a valid HRESULT value.");
  34                                 return;
  35                         }
  36
  37                         NumberParser np = new NumberParser();
  38                         long hresult = np.Parse(hresultText);
  39                         if (np.Error)
  40                         {
  41                                 serviceOutput.WriteLine(String.Format("{0} is not a valid HRESULT value.",
  42                                                                       hresultText));
  43                                 return;
  44                         }
  45
  46                         string description = GetHresultDescription(hresult);
  47                         if (description != null)
  48                         {
  49                                 serviceOutput.WriteLine(String.Format("{0} is {1}.",
  50                                                                       hresultText,
  51                                                                       description));
  52                         }
  53                         else
  54                         {
  55                                 serviceOutput.WriteLine(String.Format("I don't know about HRESULT {0}.",
  56                                                                       hresultText));
  57                         }
  58                 }
  59
  60                 public string Help()
  61                 {
  62                         return "!hresult <value>";
  63                 }
  64
  65                 private string GetHresultDescription(long hresult)
  66                 {
  67                         XmlElement root = hresultXmlDocument.DocumentElement;
  68                         XmlNode node = root.SelectSingleNode(String.Format("Hresult[@value='{0}']",
  69                                                                            hresult.ToString("X8")));
  70                         if (node != null)
  71                         {
  72                                 XmlAttribute text = node.Attributes["text"];
  73                                 if (text == null)
  74                                         throw new Exception("Node has no text attribute.");
  75                                 return text.Value;
  76                         }
  77                         else
  78                                 return null;
  79                 }
  80         }
  81 }