class/System.Xaml/System.Windows.Markup/ArrayExtension.cs

   1 //
   2 // Copyright (C) 2010 Novell Inc. http://novell.com
   3 //
   4 // Permission is hereby granted, free of charge, to any person obtaining
   5 // a copy of this software and associated documentation files (the
   6 // "Software"), to deal in the Software without restriction, including
   7 // without limitation the rights to use, copy, modify, merge, publish,
   8 // distribute, sublicense, and/or sell copies of the Software, and to
   9 // permit persons to whom the Software is furnished to do so, subject to
  10 // the following conditions:
  11 //
  12 // The above copyright notice and this permission notice shall be
  13 // included in all copies or substantial portions of the Software.
  14 //
  15 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  16 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  17 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  18 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  19 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  20 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  21 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  22 //
  23 using System;
  24 using System.Collections;
  25 using System.Collections.Generic;
  26 using System.ComponentModel;
  27 using System.Reflection;
  28 using System.Windows.Markup;
  29 using System.Xaml.Schema;
  30
  31 namespace System.Windows.Markup
  32 {
  33         [MarkupExtensionReturnType (typeof (Array))]
  34         [ContentProperty ("Items")]
  35         [System.Runtime.CompilerServices.TypeForwardedFrom (Consts.AssemblyPresentationFramework_3_5)]
  36         public class ArrayExtension : MarkupExtension
  37         {
  38                 public ArrayExtension ()
  39                 {
  40                         Items = new List<object> ();
  41                 }
  42
  43                 public ArrayExtension (Array elements)
  44                 {
  45                         if (elements == null)
  46                                 throw new ArgumentNullException ("elements");
  47                         Type = elements.GetType ().GetElementType ();
  48                         Items = new List<object> (elements.Length);
  49                         foreach (var o in elements)
  50                                 Items.Add (o);
  51                 }
  52
  53                 public ArrayExtension (Type arrayType)
  54                 {
  55                         if (arrayType == null)
  56                                 throw new ArgumentNullException ("arrayType");
  57                         Type = arrayType;
  58                         Items = new List<object> ();
  59                 }
  60
  61                 public IList Items { get; private set; }
  62
  63                 [ConstructorArgument ("arrayType")]
  64                 public Type Type { get; set; }
  65
  66                 public void AddChild (Object value)
  67                 {
  68                         // null is allowed.
  69                         Items.Add (value);
  70                 }
  71
  72                 public void AddText (string text)
  73                 {
  74                         // null is allowed.
  75                         Items.Add (text);
  76                 }
  77
  78                 public override object ProvideValue (IServiceProvider serviceProvider)
  79                 {
  80                         if (Type == null)
  81                                 throw new InvalidOperationException ("Type property must be set before calling ProvideValue method");
  82
  83                         bool invalid = false;
  84                         foreach (var item in Items) {
  85                                 if (item == null) {
  86                                         if (Type.IsValueType)
  87                                                 invalid = true;
  88                                 }
  89                                 else if (!Type.IsAssignableFrom (item.GetType ()))
  90                                         invalid = true;
  91                                 if (invalid)
  92                                         throw new InvalidOperationException (String.Format ("Item in the array must be an instance of '{0}'", Type));
  93                         }
  94                         Array a = Array.CreateInstance (Type, Items.Count);
  95                         Items.CopyTo (a, 0);
  96                         return a;
  97                 }
  98         }
  99 }