mcs/class/Managed.Windows.Forms/System.Windows.Forms/FeatureSupport.cs

   1 // Permission is hereby granted, free of charge, to any person obtaining
   2 // a copy of this software and associated documentation files (the
   3 // "Software"), to deal in the Software without restriction, including
   4 // without limitation the rights to use, copy, modify, merge, publish,
   5 // distribute, sublicense, and/or sell copies of the Software, and to
   6 // permit persons to whom the Software is furnished to do so, subject to
   7 // the following conditions:
   8 //
   9 // The above copyright notice and this permission notice shall be
  10 // included in all copies or substantial portions of the Software.
  11 //
  12 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  13 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  14 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  15 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  16 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  17 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  18 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  19 //
  20 // Copyright (c) 2005 Novell, Inc. (http://www.novell.com)
  21 //
  22 // Authors:
  23 //      Peter Bartok    (pbartok@novell.com)
  24 //
  25 //
  26
  27 // COMPLETE
  28
  29 using System.Reflection;
  30
  31 namespace System.Windows.Forms {
  32         public abstract class FeatureSupport : IFeatureSupport {
  33                 #region Public Constructors
  34                 protected FeatureSupport() {
  35                 }
  36                 #endregion      // Public Constructors
  37
  38                 #region Private and Internal Methods
  39                 private static IFeatureSupport FeatureObject(string class_name) {
  40                         Type    class_type;
  41
  42                         class_type = Type.GetType(class_name);
  43                         if ((class_type != null) && (typeof(IFeatureSupport).IsAssignableFrom(class_type))) {
  44                                 ConstructorInfo ctor;
  45
  46                                 ctor = class_type.GetConstructor(Type.EmptyTypes);
  47                                 if (ctor != null) {
  48                                         return ((IFeatureSupport)ctor.Invoke(new Object[0]));
  49                                 }
  50                         }
  51
  52                         return null;
  53                 }
  54                 #endregion      // Private and Internal Methods
  55
  56                 #region Public Static Methods
  57                 public static Version GetVersionPresent(string featureClassName, string featureConstName) {
  58                         IFeatureSupport obj;
  59
  60                         obj = FeatureObject(featureClassName);
  61                         if (obj != null) {
  62                                 return obj.GetVersionPresent(featureConstName);
  63                         }
  64                         return null;
  65                 }
  66
  67                 public static bool IsPresent(string featureClassName, string featureConstName) {
  68                         IFeatureSupport obj;
  69
  70                         obj = FeatureObject(featureClassName);
  71                         if (obj != null) {
  72                                 return obj.IsPresent(featureConstName);
  73                         }
  74
  75                         return false;
  76                 }
  77
  78                 public static bool IsPresent(string featureClassName, string featureConstName, Version minimumVersion) {
  79                         IFeatureSupport obj;
  80
  81                         obj = FeatureObject(featureClassName);
  82                         if (obj != null) {
  83                                 return obj.IsPresent(featureConstName, minimumVersion);
  84                         }
  85
  86                         return false;
  87                 }
  88                 #endregion      // Public Static Methods
  89
  90                 #region Public Instance Methods
  91                 public abstract Version GetVersionPresent(object feature);
  92
  93                 public virtual bool IsPresent(object feature) {
  94                         if (GetVersionPresent(feature) != null) {
  95                                 return true;
  96                         }
  97
  98                         return false;
  99                 }
 100
 101                 public virtual bool IsPresent(object feature, Version minimumVersion) {
 102                         Version version;
 103                         bool    retval;
 104
 105                         retval = false;
 106                         version = GetVersionPresent(feature);
 107
 108                         if ((version != null) && (version >= minimumVersion)) {
 109                                 retval = true;
 110                         }
 111
 112                         return retval;
 113                 }
 114                 #endregion      // Public Instance Methods
 115         }
 116 }