Imported Upstream version 4.6.0.125

Former-commit-id: a2155e9bd80020e49e72e86c44da02a8ac0e57a4

mcs/class/referencesource/System.Data.Entity/System/Data/Metadata/ObjectLayer/KnownAssemblyEntry.cs

@@ -0,0 +1,56 @@
+//---------------------------------------------------------------------
+// <copyright file="KnownAssemblyEntry.cs" company="Microsoft">
+//      Copyright (c) Microsoft Corporation.  All rights reserved.
+// </copyright>
+//
+// @owner       [....]
+// @backupOwner [....]
+//---------------------------------------------------------------------
+
+using System.Collections.Generic;
+using System.Reflection;
+using System.Diagnostics;
+
+namespace System.Data.Metadata.Edm
+{
+    internal sealed class KnownAssemblyEntry
+    {
+        private readonly AssemblyCacheEntry _cacheEntry;
+        private bool _referencedAssembliesAreLoaded;
+        private bool _seenWithEdmItemCollection;
+
+        internal KnownAssemblyEntry(AssemblyCacheEntry cacheEntry, bool seenWithEdmItemCollection)
+        {
+            Debug.Assert(cacheEntry != null, "Found a null cacheEntry");
+            _cacheEntry = cacheEntry;
+            _referencedAssembliesAreLoaded = false;
+            _seenWithEdmItemCollection = seenWithEdmItemCollection;
+        }
+
+        internal AssemblyCacheEntry CacheEntry
+        {
+            get { return _cacheEntry; }
+        }
+
+        public bool ReferencedAssembliesAreLoaded
+        {
+            get { return _referencedAssembliesAreLoaded; }
+            set { _referencedAssembliesAreLoaded = value; }
+        }
+
+        public bool SeenWithEdmItemCollection
+        {
+            get { return _seenWithEdmItemCollection; }
+            set { _seenWithEdmItemCollection = value; }
+        }
+
+        public bool HaveSeenInCompatibleContext(object loaderCookie, EdmItemCollection itemCollection)
+        {
+            // a new "context" is only when we have not seen this assembly with an itemCollection that is non-null
+            // and we now have a non-null itemCollection, and we are not already in AttributeLoader mode.
+            return SeenWithEdmItemCollection ||
+                   itemCollection == null ||
+                   ObjectItemAssemblyLoader.IsAttributeLoader(loaderCookie);
+        }
+    }
+}