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

   1 //
   2 // System.Web.UI.CollectionBuilder.cs
   3 //
   4 // Authors:
   5 //      Gonzalo Paniagua Javier (gonzalo@ximian.com)
   6 //
   7 // (c) 2003 Ximian, Inc. (http://www.ximian.com)
   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;
  32 using System.Collections;
  33 using System.Reflection;
  34 using System.Text;
  35
  36 namespace System.Web.UI
  37 {
  38         sealed class CollectionBuilder : ControlBuilder
  39         {
  40                 Type[] possibleElementTypes;
  41
  42                 internal CollectionBuilder ()
  43                 {
  44                 }
  45
  46                 public override void AppendLiteralString (string s)
  47                 {
  48                         if (s != null && s.Trim ().Length > 0)
  49                                 throw new HttpException ("Literal content not allowed for " + ControlType);
  50                 }
  51
  52                 public override Type GetChildControlType (string tagName, IDictionary attribs)
  53                 {
  54                         Type t = Root.GetChildControlType (tagName, attribs);
  55                         if (possibleElementTypes != null) {
  56                                bool foundMatchingType = false;
  57                                for (int i = 0; i < possibleElementTypes.Length && !foundMatchingType; ++i)
  58                                        foundMatchingType = possibleElementTypes[i].IsAssignableFrom (t);
  59
  60                                if (!foundMatchingType) {
  61                                        StringBuilder possibleTypesString = new StringBuilder ();
  62                                        for (int i = 0; i < possibleElementTypes.Length; i++) {
  63                                                if (i != 0)
  64                                                        possibleTypesString.Append (", ");
  65                                                possibleTypesString.Append (possibleElementTypes[i]);
  66                                        }
  67                                        throw new HttpException ("Cannot add a " + t + " to " + possibleTypesString);
  68                                }
  69                         }
  70
  71                         return t;
  72                 }
  73
  74                 public override void Init (TemplateParser parser,
  75                                            ControlBuilder parentBuilder,
  76                                            Type type,
  77                                            string tagName,
  78                                            string id,
  79                                            IDictionary attribs)
  80                 {
  81                         base.Init (parser, parentBuilder, type, tagName, id, attribs);
  82
  83                         PropertyInfo prop = parentBuilder.ControlType.GetProperty (tagName, FlagsNoCase);
  84                         SetControlType (prop.PropertyType);
  85
  86                         MemberInfo[] mems = ControlType.GetMember ("Item", MemberTypes.Property, FlagsNoCase & ~BindingFlags.IgnoreCase);
  87                         if (mems.Length > 0) {
  88                                possibleElementTypes = new Type [mems.Length];
  89                                for (int i = 0; i < mems.Length; ++i)
  90                                        possibleElementTypes [i] = ((PropertyInfo)mems [i]).PropertyType;
  91                         } else
  92                                 throw new HttpException ("Collection of type '" + ControlType + "' does not have an indexer.");
  93                 }
  94         }
  95 }
  96