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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.Collections;
using System.Collections.Generic;
using System.Diagnostics.Contracts;
using System.Runtime.InteropServices;
using System.Runtime.CompilerServices;
namespace System.Runtime.InteropServices.WindowsRuntime
{
// These stubs will be used when a call via IReadOnlyCollection<KeyValuePair<K, V>> is made in managed code.
// This can mean two things - either the underlying unmanaged object implements IMapView<K, V> or it
// implements IVectorView<IKeyValuePair<K, V>> and we cannot determine this statically in the general
// case so we have to cast at run-time. Used by the interop mashaling infrastructure.
//
// The methods on this class must be written VERY carefully to avoid introducing security holes.
// That's because they are invoked with special "this"! The "this" object
// for all of these methods are not MapViewToReadOnlyCollectionAdapter objects. Rather, they are of type
// IVectorView<KeyValuePair<K, V>> or IMapView<K, V>. No actual MapViewToReadOnlyCollectionAdapter object is ever
// instantiated. Thus, you will see a lot of expressions that cast "this" to "IVectorView<KeyValuePair<K, V>>"
// or "IMapView<K, V>".
internal sealed class MapViewToReadOnlyCollectionAdapter
{
private MapViewToReadOnlyCollectionAdapter()
{
Contract.Assert(false, "This class is never instantiated");
}
// int Count { get }
[Pure]
[SecurityCritical]
internal int Count<K, V>()
{
object _this = JitHelpers.UnsafeCast<object>(this);
IMapView<K, V> _this_map = _this as IMapView<K, V>;
if (_this_map != null)
{
uint size = _this_map.Size;
if (((uint)Int32.MaxValue) < size)
{
throw new InvalidOperationException(Environment.GetResourceString("InvalidOperation_CollectionBackingDictionaryTooLarge"));
}
return (int)size;
}
else
{
IVectorView<KeyValuePair<K, V>> _this_vector = JitHelpers.UnsafeCast<IVectorView<KeyValuePair<K, V>>>(this);
uint size = _this_vector.Size;
if (((uint)Int32.MaxValue) < size)
{
throw new InvalidOperationException(Environment.GetResourceString("InvalidOperation_CollectionBackingListTooLarge"));
}
return (int)size;
}
}
}
}
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