mcs/class/referencesource/mscorlib/system/runtime/interopservices/windowsruntime/listtobindablevectorviewadapter.cs

   1 // ==++==
   2 //
   3 //   Copyright (c) Microsoft Corporation.  All rights reserved.
   4 //
   5 // ==--==
   6 //
   7 // <OWNER>GPaperin</OWNER>
   8 // <OWNER>[....]</OWNER>
   9
  10 using System;
  11 using System.Security;
  12 using System.Reflection;
  13 using System.Collections;
  14 using System.Collections.Generic;
  15 using System.Collections.ObjectModel;
  16 using System.Diagnostics.Contracts;
  17 using System.Runtime.InteropServices;
  18 using System.Runtime.CompilerServices;
  19
  20 namespace System.Runtime.InteropServices.WindowsRuntime
  21 {
  22     /// A Windows Runtime IBindableVectorView implementation that wraps around a managed IList exposing
  23     /// it to Windows runtime interop.
  24     internal sealed class ListToBindableVectorViewAdapter : IBindableVectorView
  25     {
  26         private readonly IList list;
  27
  28         internal ListToBindableVectorViewAdapter(IList list)
  29         {
  30             if (list == null)
  31                 throw new ArgumentNullException("list");
  32
  33             Contract.EndContractBlock();
  34
  35             this.list = list;
  36         }
  37
  38         private static void EnsureIndexInt32(uint index, int listCapacity)
  39         {
  40             // We use '<=' and not '<' becasue Int32.MaxValue == index would imply
  41             // that Size > Int32.MaxValue:
  42             if (((uint)Int32.MaxValue) <= index || index >= (uint)listCapacity)
  43             {
  44                 Exception e = new ArgumentOutOfRangeException("index", Environment.GetResourceString("ArgumentOutOfRange_IndexLargerThanMaxValue"));
  45                 e.SetErrorCode(__HResults.E_BOUNDS);
  46                 throw e;
  47             }
  48         }
  49
  50         // IBindableIterable implementation:
  51
  52         public IBindableIterator First()
  53         {
  54             IEnumerator enumerator = list.GetEnumerator();
  55             return new EnumeratorToIteratorAdapter<object>(new EnumerableToBindableIterableAdapter.NonGenericToGenericEnumerator(enumerator));
  56         }
  57
  58         // IBindableVectorView implementation:
  59
  60         public object GetAt(uint index)
  61         {
  62             EnsureIndexInt32(index, list.Count);
  63
  64             try
  65             {
  66                 return list[(int)index];
  67
  68             }
  69             catch (ArgumentOutOfRangeException ex)
  70             {
  71                 throw WindowsRuntimeMarshal.GetExceptionForHR(__HResults.E_BOUNDS, ex, "ArgumentOutOfRange_IndexOutOfRange");
  72             }
  73         }
  74
  75         public uint Size
  76         {
  77             get
  78             {
  79                 return (uint)list.Count;
  80             }
  81         }
  82
  83         public bool IndexOf(object value, out uint index)
  84         {
  85             int ind = list.IndexOf(value);
  86
  87             if (-1 == ind)
  88             {
  89                 index = 0;
  90                 return false;
  91             }
  92
  93             index = (uint)ind;
  94             return true;
  95         }
  96     }
  97 }