nunit24/NUnitCore/core/ExtensionPoint.cs

   1 using System;
   2 using System.Collections;
   3 using NUnit.Core.Extensibility;
   4
   5 namespace NUnit.Core
   6 {
   7         /// <summary>
   8         /// ExtensionPoint is used as a base class for all
   9         /// extension points.
  10         /// </summary>
  11         public abstract class ExtensionPoint : IExtensionPoint
  12         {
  13                 private string name;
  14                 private IExtensionHost host;
  15
  16                 protected ArrayList extensions = new ArrayList();
  17
  18                 #region Constructor
  19                 public ExtensionPoint(string name, IExtensionHost host)
  20                 {
  21                         this.name = name;
  22                         this.host = host;
  23                 }
  24                 #endregion
  25
  26                 #region IExtensionPoint Members
  27                 /// <summary>
  28                 /// Get the name of this extension point
  29                 /// </summary>
  30                 public string Name
  31                 {
  32                         get { return this.name; }
  33                 }
  34
  35                 /// <summary>
  36                 /// Get the host that provides this extension point
  37                 /// </summary>
  38                 public IExtensionHost Host
  39                 {
  40                         get { return this.host; }
  41                 }
  42
  43                 /// <summary>
  44                 /// Install an extension at this extension point. If the
  45                 /// extension object does not meet the requirements for
  46                 /// this extension point, an exception is thrown.
  47                 /// </summary>
  48                 /// <param name="extension">The extension to install</param>
  49                 public void Install(object extension)
  50                 {
  51                         if ( !ValidExtension( extension ) )
  52                                 throw new ArgumentException(
  53                                         extension.GetType().FullName + " is not {0} extension point", "extension" );
  54
  55                         extensions.Add( extension );
  56                 }
  57
  58                 /// <summary>
  59                 /// Removes an extension from this extension point. If the
  60                 /// extension object is not present, the method returns
  61                 /// without error.
  62                 /// </summary>
  63                 /// <param name="extension"></param>
  64                 public void Remove(object extension)
  65                 {
  66                         extensions.Remove( extension );
  67                 }
  68                 #endregion
  69
  70                 #region Abstract Methods
  71                 protected abstract bool ValidExtension(object extension);
  72                 #endregion
  73         }
  74 }