Imported Upstream version 4.6.0.125

Former-commit-id: a2155e9bd80020e49e72e86c44da02a8ac0e57a4

mcs/class/referencesource/System.Data.Entity/System/Data/Objects/DataClasses/RelationshipFixer.cs

@@ -0,0 +1,44 @@
+//---------------------------------------------------------------------
+// <copyright file="RelationshipFixer.cs" company="Microsoft">
+//      Copyright (c) Microsoft Corporation.  All rights reserved.
+// </copyright>
+//
+// @owner       [....]
+// @backupOwner [....]
+//---------------------------------------------------------------------
+using System.Data.Metadata.Edm;
+
+namespace System.Data.Objects.DataClasses
+{
+    [Serializable]
+    internal class RelationshipFixer<TSourceEntity, TTargetEntity> : IRelationshipFixer
+        where TSourceEntity : class
+        where TTargetEntity : class
+    {
+        // The following fields are serialized.  Adding or removing a serialized field is considered
+        // a breaking change.  This includes changing the field type or field name of existing
+        // serialized fields. If you need to make this kind of change, it may be possible, but it
+        // will require some custom serialization/deserialization code.
+        RelationshipMultiplicity _sourceRoleMultiplicity;
+        RelationshipMultiplicity _targetRoleMultiplicity;
+
+        internal RelationshipFixer(RelationshipMultiplicity sourceRoleMultiplicity, RelationshipMultiplicity targetRoleMultiplicity)
+        {
+            _sourceRoleMultiplicity = sourceRoleMultiplicity;
+            _targetRoleMultiplicity = targetRoleMultiplicity;
+        }
+
+        /// <summary>
+        /// Used during relationship fixup when the source end of the relationship is not
+        /// yet in the relationships list, and needs to be created
+        /// </summary>
+        /// <param name="navigation">RelationshipNavigation to be set on new RelatedEnd</param>
+        /// <param name="relationshipManager">RelationshipManager to use for creating the new end</param>
+        /// <returns>Reference to the new collection or reference on the other end of the relationship</returns>
+        RelatedEnd IRelationshipFixer.CreateSourceEnd(RelationshipNavigation navigation, RelationshipManager relationshipManager)
+        {            
+            return relationshipManager.CreateRelatedEnd<TTargetEntity, TSourceEntity>(navigation, _targetRoleMultiplicity, _sourceRoleMultiplicity, /*existingRelatedEnd*/ null);
+        }        
+    }
+
+}