mcs/class/System.Web/System.Web.UI/ListSourceHelper.cs

   1 //
   2 // System.Web.UI.ListSourceHelper
   3 //
   4 // Authors:
   5 //      Ben Maurer (bmaurer@users.sourceforge.net)
   6 //
   7 // (C) 2003 Ben Maurer
   8 //
   9
  10 //
  11 // Permission is hereby granted, free of charge, to any person obtaining
  12 // a copy of this software and associated documentation files (the
  13 // "Software"), to deal in the Software without restriction, including
  14 // without limitation the rights to use, copy, modify, merge, publish,
  15 // distribute, sublicense, and/or sell copies of the Software, and to
  16 // permit persons to whom the Software is furnished to do so, subject to
  17 // the following conditions:
  18 //
  19 // The above copyright notice and this permission notice shall be
  20 // included in all copies or substantial portions of the Software.
  21 //
  22 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  23 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  24 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  25 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  26 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  27 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  28 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  29 //
  30
  31 using System.Collections;
  32 using System.Collections.Specialized;
  33 using System.Text;
  34 using System.ComponentModel;
  35 using System.Collections.Generic;
  36
  37 namespace System.Web.UI {
  38         public static class ListSourceHelper {
  39
  40                 public static bool ContainsListCollection (IDataSource dataSource)
  41                 {
  42                         return dataSource.GetViewNames ().Count > 0;
  43                 }
  44
  45                 public static IList GetList (IDataSource dataSource)
  46                 {
  47                         if (dataSource.GetViewNames ().Count == 0)
  48                                 return null;
  49
  50                         ListSourceList list = new ListSourceList ();
  51                         list.Add (dataSource);
  52                         return list;
  53                 }
  54
  55                 sealed class ListSourceList : List<IDataSource>, ITypedList
  56                 {
  57                         #region ITypedList Members
  58
  59                         PropertyDescriptorCollection ITypedList.GetItemProperties (PropertyDescriptor [] listAccessors) {
  60                                 ICollection viewNames = this [0].GetViewNames ();
  61                                 PropertyDescriptor [] a = new PropertyDescriptor [viewNames.Count];
  62                                 int i = 0;
  63                                 foreach (string viewName in viewNames) {
  64                                         a[i++] = new ListSourcePropertyDescriptor (viewName, null);
  65                                 }
  66                                 return new PropertyDescriptorCollection (a);
  67                         }
  68
  69                         string ITypedList.GetListName (PropertyDescriptor [] listAccessors) {
  70                                 return String.Empty;
  71                         }
  72
  73                         #endregion
  74                 }
  75
  76                 sealed class ListSourcePropertyDescriptor : PropertyDescriptor
  77                 {
  78                         public ListSourcePropertyDescriptor (MemberDescriptor descr)
  79                                 : base (descr) {
  80                         }
  81
  82                         public ListSourcePropertyDescriptor (string name, Attribute [] attrs)
  83                                 : base (name, attrs) {
  84                         }
  85
  86                         public ListSourcePropertyDescriptor (MemberDescriptor descr, Attribute [] attrs)
  87                                 : base (descr, attrs) {
  88                         }
  89
  90                         public override bool CanResetValue (object component) {
  91                                 throw new NotImplementedException ();
  92                         }
  93
  94                         public override Type ComponentType {
  95                                 get { throw new NotImplementedException (); }
  96                         }
  97
  98                         public override object GetValue (object component) {
  99                                 IDataSource dataSource = component as IDataSource;
 100                                 if (dataSource == null)
 101                                         return null;
 102
 103                                 DataSourceView view = dataSource.GetView (Name);
 104                                 return view.ExecuteSelect (DataSourceSelectArguments.Empty);
 105                         }
 106
 107                         public override bool IsReadOnly {
 108                                 get { return true; }
 109                         }
 110
 111                         public override Type PropertyType {
 112                                 get { return typeof(IEnumerable); }
 113                         }
 114
 115                         public override void ResetValue (object component) {
 116                                 throw new NotImplementedException ();
 117                         }
 118
 119                         public override void SetValue (object component, object value) {
 120                                 throw new NotImplementedException ();
 121                         }
 122
 123                         public override bool ShouldSerializeValue (object component) {
 124                                 throw new NotImplementedException ();
 125                         }
 126                 }
 127         }
 128
 129
 130 }