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Diffstat (limited to 'src/mscorlib/src/System/Runtime/InteropServices/WindowsRuntime/DictionaryToMapAdapter.cs')
-rw-r--r-- | src/mscorlib/src/System/Runtime/InteropServices/WindowsRuntime/DictionaryToMapAdapter.cs | 117 |
1 files changed, 117 insertions, 0 deletions
diff --git a/src/mscorlib/src/System/Runtime/InteropServices/WindowsRuntime/DictionaryToMapAdapter.cs b/src/mscorlib/src/System/Runtime/InteropServices/WindowsRuntime/DictionaryToMapAdapter.cs new file mode 100644 index 0000000000..1dcdeadcc3 --- /dev/null +++ b/src/mscorlib/src/System/Runtime/InteropServices/WindowsRuntime/DictionaryToMapAdapter.cs @@ -0,0 +1,117 @@ +// Copyright (c) Microsoft. All rights reserved. +// Licensed under the MIT license. See LICENSE file in the project root for full license 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 +{ + // This is a set of stub methods implementing the support for the IMap`2 interface on managed + // objects that implement IDictionary`2. 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 DictionaryToMapAdapter objects. Rather, they are of type + // IDictionary<K, V>. No actual DictionaryToMapAdapter object is ever instantiated. Thus, you will + // see a lot of expressions that cast "this" to "IDictionary<K, V>". + internal sealed class DictionaryToMapAdapter + { + private DictionaryToMapAdapter() + { + Contract.Assert(false, "This class is never instantiated"); + } + + // V Lookup(K key) + [SecurityCritical] + internal V Lookup<K, V>(K key) + { + IDictionary<K, V> _this = JitHelpers.UnsafeCast<IDictionary<K, V>>(this); + V value; + bool keyFound = _this.TryGetValue(key, out value); + + if (!keyFound) + { + Exception e = new KeyNotFoundException(Environment.GetResourceString("Arg_KeyNotFound")); + e.SetErrorCode(__HResults.E_BOUNDS); + throw e; + } + + return value; + } + + // uint Size { get } + [SecurityCritical] + internal uint Size<K, V>() + { + IDictionary<K, V> _this = JitHelpers.UnsafeCast<IDictionary<K, V>>(this); + return (uint)_this.Count; + } + + // bool HasKey(K key) + [SecurityCritical] + internal bool HasKey<K, V>(K key) + { + IDictionary<K, V> _this = JitHelpers.UnsafeCast<IDictionary<K, V>>(this); + return _this.ContainsKey(key); + } + + // IMapView<K, V> GetView() + [SecurityCritical] + internal IReadOnlyDictionary<K, V> GetView<K, V>() + { + IDictionary<K, V> _this = JitHelpers.UnsafeCast<IDictionary<K, V>>(this); + Contract.Assert(_this != null); + + // Note: This dictionary is not really read-only - you could QI for a modifiable + // dictionary. We gain some perf by doing this. We believe this is acceptable. + IReadOnlyDictionary<K, V> roDictionary = _this as IReadOnlyDictionary<K, V>; + if (roDictionary == null) + { + roDictionary = new ReadOnlyDictionary<K, V>(_this); + } + return roDictionary; + } + + // bool Insert(K key, V value) + [SecurityCritical] + internal bool Insert<K, V>(K key, V value) + { + IDictionary<K, V> _this = JitHelpers.UnsafeCast<IDictionary<K, V>>(this); + bool replacing = _this.ContainsKey(key); + _this[key] = value; + return replacing; + } + + // void Remove(K key) + [SecurityCritical] + internal void Remove<K, V>(K key) + { + IDictionary<K, V> _this = JitHelpers.UnsafeCast<IDictionary<K, V>>(this); + bool removed = _this.Remove(key); + + if (!removed) + { + Exception e = new KeyNotFoundException(Environment.GetResourceString("Arg_KeyNotFound")); + e.SetErrorCode(__HResults.E_BOUNDS); + throw e; + } + } + + // void Clear() + [SecurityCritical] + internal void Clear<K, V>() + { + IDictionary<K, V> _this = JitHelpers.UnsafeCast<IDictionary<K, V>>(this); + _this.Clear(); + } + } +} |