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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
//
using System;
using System.Security;
using System.Reflection;
using System.Collections;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Diagnostics.Contracts;
using System.Runtime.InteropServices;
using System.Runtime.CompilerServices;
namespace System.Runtime.InteropServices.WindowsRuntime
{
/// A Windows Runtime IBindableVectorView implementation that wraps around a managed IList exposing
/// it to Windows runtime interop.
internal sealed class ListToBindableVectorViewAdapter : IBindableVectorView
{
private readonly IList list;
internal ListToBindableVectorViewAdapter(IList list)
{
if (list == null)
throw new ArgumentNullException(nameof(list));
Contract.EndContractBlock();
this.list = list;
}
private static void EnsureIndexInt32(uint index, int listCapacity)
{
// We use '<=' and not '<' becasue Int32.MaxValue == index would imply
// that Size > Int32.MaxValue:
if (((uint)Int32.MaxValue) <= index || index >= (uint)listCapacity)
{
Exception e = new ArgumentOutOfRangeException(nameof(index), SR.ArgumentOutOfRange_IndexLargerThanMaxValue);
e.SetErrorCode(__HResults.E_BOUNDS);
throw e;
}
}
// IBindableIterable implementation:
public IBindableIterator First()
{
IEnumerator enumerator = list.GetEnumerator();
return new EnumeratorToIteratorAdapter<object>(new EnumerableToBindableIterableAdapter.NonGenericToGenericEnumerator(enumerator));
}
// IBindableVectorView implementation:
public object GetAt(uint index)
{
EnsureIndexInt32(index, list.Count);
try
{
return list[(int)index];
}
catch (ArgumentOutOfRangeException ex)
{
throw WindowsRuntimeMarshal.GetExceptionForHR(__HResults.E_BOUNDS, ex, "ArgumentOutOfRange_IndexOutOfRange");
}
}
public uint Size
{
get
{
return (uint)list.Count;
}
}
public bool IndexOf(object value, out uint index)
{
int ind = list.IndexOf(value);
if (-1 == ind)
{
index = 0;
return false;
}
index = (uint)ind;
return true;
}
}
}
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