Imported Upstream version 4.6.0.125

Former-commit-id: a2155e9bd80020e49e72e86c44da02a8ac0e57a4

mcs/class/referencesource/System.Data.Entity/System/Data/Mapping/ViewGeneration/Validation/BasicCellRelation.cs

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+//---------------------------------------------------------------------
+// <copyright file="BasicCellRelation.cs" company="Microsoft">
+//      Copyright (c) Microsoft Corporation.  All rights reserved.Bharani1729
+// </copyright>
+//
+// @owner [....]
+// @backupOwner [....]
+//---------------------------------------------------------------------
+
+using System.Collections.Generic;
+using System.Data.Mapping.ViewGeneration.Structures;
+using System.Text;
+using System.Diagnostics;
+using System.Data.Common.Utils;
+using System.Data.Metadata.Edm;
+
+namespace System.Data.Mapping.ViewGeneration.Validation
+{
+
+    using BasicSchemaConstraints = SchemaConstraints<BasicKeyConstraint>;
+
+    // This class represents a relation signature that lists all scalar
+    // slots for the join tree in cell query (before projection)
+    internal class BasicCellRelation : CellRelation
+    {
+
+        #region Constructor
+        // effects: Creates a basic cell relation for query
+        internal BasicCellRelation(CellQuery cellQuery, ViewCellRelation viewCellRelation,
+                                   IEnumerable<MemberProjectedSlot> slots)
+            : base(viewCellRelation.CellNumber)
+        {
+            m_cellQuery = cellQuery;
+            m_slots = new List<MemberProjectedSlot>(slots);
+            Debug.Assert(m_slots.Count > 0, "Cell relation with not even an exent?");
+            m_viewCellRelation = viewCellRelation;
+        }
+        #endregion
+
+        #region Fields
+        private CellQuery m_cellQuery;
+        private List<MemberProjectedSlot> m_slots;
+        private ViewCellRelation m_viewCellRelation; // The viewcellrelation
+        // corresponding to this basiccellrelation
+        #endregion
+
+        #region Properties
+        internal ViewCellRelation ViewCellRelation
+        {
+            get { return m_viewCellRelation; }
+        }
+        #endregion
+
+        #region Key Constraints Methods
+        // effects: Modifies constraints to contain the key constraints that
+        // are present in this relation
+        internal void PopulateKeyConstraints(BasicSchemaConstraints constraints)
+        {
+            Debug.Assert(this == m_cellQuery.BasicCellRelation, "Cellquery does not point to the correct BasicCellRelation?");
+            Debug.Assert(m_cellQuery.Extent is EntitySet || m_cellQuery.Extent is AssociationSet,
+                         "Top level extents handled is currently entityset or association set");
+            if (m_cellQuery.Extent is EntitySet)
+            {
+                PopulateKeyConstraintsForEntitySet(constraints);
+            }
+            else
+            {
+                PopulateKeyConstraintsForRelationshipSet(constraints);
+            }
+        }
+
+        // requires: this to correspond to a cell relation for an entityset (m_cellQuery.Extent)
+        // effects: Adds any key constraints present in this to constraints
+        private void PopulateKeyConstraintsForEntitySet(BasicSchemaConstraints constraints)
+        {
+            MemberPath prefix = new MemberPath(m_cellQuery.Extent);
+            EntityType entityType = (EntityType)m_cellQuery.Extent.ElementType;
+
+            // Get all the keys for the entity type and create the key constraints
+            List<ExtentKey> keys = ExtentKey.GetKeysForEntityType(prefix, entityType);
+            AddKeyConstraints(keys, constraints);
+        }
+
+        // requires: this to correspond to a cell relation for an association set (m_cellQuery.Extent)
+        // effects: Adds any key constraints present in this relation in
+        // constraints
+        private void PopulateKeyConstraintsForRelationshipSet(BasicSchemaConstraints constraints)
+        {
+            AssociationSet relationshipSet = m_cellQuery.Extent as AssociationSet;
+            // Gather all members of all keys
+            // CHANGE_[....]_FEATURE_KEYS: assume that an Entity has exactly one key. Otherwise we
+            // have to take a cross-product of all keys
+
+            // Keep track of all the key members for the association in a set
+            // so that if no end corresponds to a key, we use all the members
+            // to form the key
+            Set<MemberPath> associationKeyMembers = new Set<MemberPath>(MemberPath.EqualityComparer);
+            bool hasAnEndThatFormsKey = false;
+
+            // Determine the keys of each end. If the end forms a key, add it
+            // as a key to the set
+
+            foreach (AssociationSetEnd end in relationshipSet.AssociationSetEnds)
+            {
+                AssociationEndMember endMember = end.CorrespondingAssociationEndMember;
+
+                MemberPath prefix = new MemberPath(relationshipSet, endMember);
+                List<ExtentKey> keys = ExtentKey.GetKeysForEntityType(prefix, end.EntitySet.ElementType);
+                Debug.Assert(keys.Count > 0, "No keys for entity?");
+                Debug.Assert(keys.Count == 1, "Currently, we only support primary keys");
+
+                if (MetadataHelper.DoesEndFormKey(relationshipSet, endMember))
+                {
+                    // This end has is a key end
+                    AddKeyConstraints(keys, constraints);
+                    hasAnEndThatFormsKey = true;
+                }
+                // Add the members of the (only) key to associationKey
+                associationKeyMembers.AddRange(keys[0].KeyFields);
+            }
+            // If an end forms a key then that key implies the full key
+            if (false == hasAnEndThatFormsKey)
+            {
+                // No end is a key -- take all the end members and make a key
+                // based on that
+                ExtentKey key = new ExtentKey(associationKeyMembers);
+                ExtentKey[] keys = new ExtentKey[] { key };
+                AddKeyConstraints(keys, constraints);
+            }
+        }
+
+        // effects: Given keys for this relation, adds one key constraint for
+        // each key present in keys
+        private void AddKeyConstraints(IEnumerable<ExtentKey> keys, BasicSchemaConstraints constraints)
+        {
+            foreach (ExtentKey key in keys)
+            {
+                // If the key is being projected, only then do we add the key constraint
+
+                List<MemberProjectedSlot> keySlots = MemberProjectedSlot.GetSlots(m_slots, key.KeyFields);
+                if (keySlots != null)
+                {
+                    BasicKeyConstraint keyConstraint = new BasicKeyConstraint(this, keySlots);
+                    constraints.Add(keyConstraint);
+                }
+            }
+        }
+        #endregion
+
+        #region Comparer/String Methods
+        protected override int GetHash()
+        {
+            // Note: Using CLR-Hashcode
+            return m_cellQuery.GetHashCode();
+            // We need not hash the slots, etc - cellQuery should give us enough
+            // differentiation and land the relation into the same bucket
+        }
+
+        internal override void ToCompactString(StringBuilder builder)
+        {
+            builder.Append("BasicRel: ");
+            // Just print the extent name from slot 0
+            StringUtil.FormatStringBuilder(builder, "{0}", m_slots[0]);
+        }
+        #endregion
+    }
+}

mcs/class/referencesource/System.Data.Entity/System/Data/Mapping/ViewGeneration/Validation/BasicKeyConstraint.cs

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+//---------------------------------------------------------------------
+// <copyright file="BasicKeyConstraint.cs" company="Microsoft">
+//      Copyright (c) Microsoft Corporation.  All rights reserved.
+// </copyright>
+//
+// @owner [....]
+// @backupOwner [....]
+//---------------------------------------------------------------------
+
+
+using System.Data.Mapping.ViewGeneration.Structures;
+using System.Collections.Generic;
+
+namespace System.Data.Mapping.ViewGeneration.Validation
+{
+
+    using BasicSchemaConstraints = SchemaConstraints<BasicKeyConstraint>;
+
+    // Class representing a key constraint on the basic cell relations
+    internal class BasicKeyConstraint : KeyConstraint<BasicCellRelation, MemberProjectedSlot>
+    {
+
+        #region Constructor
+        //  Constructs a key constraint for the given relation and keyslots
+        internal BasicKeyConstraint(BasicCellRelation relation, IEnumerable<MemberProjectedSlot> keySlots)
+            : base(relation, keySlots, ProjectedSlot.EqualityComparer)
+        { }
+        #endregion
+
+        #region Methods
+        // effects: Propagates this constraint from the basic cell relation
+        // to the corresponding view cell relation and returns the new constraint
+        // If all the key slots are not being projected, returns null
+        internal ViewKeyConstraint Propagate()
+        {
+            ViewCellRelation viewCellRelation = CellRelation.ViewCellRelation;
+            // If all slots appear in the projection, propagate key constraint
+            List<ViewCellSlot> viewSlots = new List<ViewCellSlot>();
+            foreach (MemberProjectedSlot keySlot in KeySlots)
+            {
+                ViewCellSlot viewCellSlot = viewCellRelation.LookupViewSlot(keySlot);
+                if (viewCellSlot == null)
+                {
+                    // Slot is missing -- no key constraint on the view relation
+                    return null;
+                }
+                viewSlots.Add(viewCellSlot);
+            }
+
+            // Create a key on view relation
+            ViewKeyConstraint viewKeyConstraint = new ViewKeyConstraint(viewCellRelation, viewSlots);
+            return viewKeyConstraint;
+        }
+        #endregion
+    }
+}

mcs/class/referencesource/System.Data.Entity/System/Data/Mapping/ViewGeneration/Validation/CellRelation.cs

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+//---------------------------------------------------------------------
+// <copyright file="CellRelation.cs" company="Microsoft">
+//      Copyright (c) Microsoft Corporation.  All rights reserved.
+// </copyright>
+//
+// @owner [....]
+// @backupOwner [....]
+//---------------------------------------------------------------------
+
+
+using System.Data.Common.Utils;
+using System.Collections.Generic;
+
+namespace System.Data.Mapping.ViewGeneration.Validation
+{
+    // Abstract class representing a relation signature for a cell query
+    internal abstract class CellRelation : InternalBase
+    {
+
+        #region Constructor
+        // effects: Given a cell number (for debugging purposes), creates a
+        // cell relation 
+        protected CellRelation(int cellNumber)
+        {
+            m_cellNumber = cellNumber;
+        }
+        #endregion
+
+        #region Fields
+        internal int m_cellNumber; // The number of the cell for which this
+        // relation was made (for debugging) 
+        #endregion
+
+        #region Properties
+        internal int CellNumber
+        {
+            get { return m_cellNumber; }
+        }
+        #endregion
+
+        #region Methods
+
+        protected abstract int GetHash();
+
+        #endregion
+    }
+}

mcs/class/referencesource/System.Data.Entity/System/Data/Mapping/ViewGeneration/Validation/ConstraintBase.cs

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+//---------------------------------------------------------------------
+// <copyright file="ConstraintBase.cs" company="Microsoft">
+//      Copyright (c) Microsoft Corporation.  All rights reserved.
+// </copyright>
+//
+// @owner srimand
+// @backupOwner cmeek
+//---------------------------------------------------------------------
+
+using System.Data.Common.Utils;
+using System.Data.Common.Utils.Boolean;
+using System.Data.Mapping.ViewGeneration.Structures;
+using System.Text;
+using System.Collections.Generic;
+using System.Diagnostics;
+
+namespace System.Data.Mapping.ViewGeneration.Validation
+{
+
+    using WrapperBoolExpr = BoolExpr<LeftCellWrapper>;
+    using WrapperTreeExpr = TreeExpr<LeftCellWrapper>;
+    using WrapperAndExpr = AndExpr<LeftCellWrapper>;
+    using WrapperOrExpr = OrExpr<LeftCellWrapper>;
+    using WrapperNotExpr = NotExpr<LeftCellWrapper>;
+    using WrapperTermExpr = TermExpr<LeftCellWrapper>;
+    using WrapperTrueExpr = TrueExpr<LeftCellWrapper>;
+    using WrapperFalseExpr = FalseExpr<LeftCellWrapper>;
+
+    // A superclass for constraint errors. It also contains useful constraint
+    // checking methods
+    internal abstract class ConstraintBase : InternalBase
+    {
+
+        #region Methods
+        // effects: Returns an error log record with this constraint's information
+        internal abstract ErrorLog.Record GetErrorRecord();
+        #endregion
+    }
+}

mcs/class/referencesource/System.Data.Entity/System/Data/Mapping/ViewGeneration/Validation/ExtentKey.cs

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+//---------------------------------------------------------------------
+// <copyright file="ExtentKey.cs" company="Microsoft">
+//      Copyright (c) Microsoft Corporation.  All rights reserved.
+// </copyright>
+//
+// @owner [....]
+// @backupOwner [....]
+//---------------------------------------------------------------------
+
+
+using System.Data.Common.Utils;
+using System.Collections.Generic;
+using System.Text;
+using System.Diagnostics;
+using System.Data.Metadata.Edm;
+
+namespace System.Data.Mapping.ViewGeneration.Structures
+{
+
+    // This class represents the key of  constraint on values that a relation slot may have
+    internal class ExtentKey : InternalBase
+    {
+
+        #region Constructors
+        // effects: Creates a key object for an extent (present in each MemberPath)
+        // with the fields corresponding to keyFields
+        internal ExtentKey(IEnumerable<MemberPath> keyFields)
+        {
+            m_keyFields = new List<MemberPath>(keyFields);
+        }
+        #endregion
+
+        #region Fields
+        // All the key fields in an entity set
+        private List<MemberPath> m_keyFields;
+        #endregion
+
+        #region Properties
+        internal IEnumerable<MemberPath> KeyFields
+        {
+            get { return m_keyFields; }
+        }
+        #endregion
+
+        #region Methods
+        // effects: Determines all the keys (unique and primary for
+        // entityType) for entityType and returns a key. "prefix" gives the
+        // path of the extent or end of a relationship in a relationship set
+        // -- prefix is prepended to the entity's key fields to get the full memberpath
+        internal static List<ExtentKey> GetKeysForEntityType(MemberPath prefix, EntityType entityType)
+        {
+            // CHANGE_[....]_MULTIPLE_KEYS: currently there is a single key only. Need to support
+            // keys inside complex types + unique keys
+            ExtentKey key = GetPrimaryKeyForEntityType(prefix, entityType);
+
+            List<ExtentKey> keys = new List<ExtentKey>();
+            keys.Add(key);
+            return keys;
+        }
+
+        // effects: Returns the key for entityType prefixed with prefix (for
+        // its memberPath)
+        internal static ExtentKey GetPrimaryKeyForEntityType(MemberPath prefix, EntityType entityType)
+        {
+            List<MemberPath> keyFields = new List<MemberPath>();
+            foreach (EdmMember keyMember in entityType.KeyMembers)
+            {
+                Debug.Assert(keyMember != null, "Bogus key member in metadata");
+                keyFields.Add(new MemberPath(prefix, keyMember));
+            }
+
+            // Just have one key for now
+            ExtentKey key = new ExtentKey(keyFields);
+            return key;
+        }
+
+        // effects: Returns a key correspnding to all the fields in different
+        // ends of relationtype prefixed with "prefix"
+        internal static ExtentKey GetKeyForRelationType(MemberPath prefix, AssociationType relationType)
+        {
+            List<MemberPath> keyFields = new List<MemberPath>();
+
+            foreach (AssociationEndMember endMember in relationType.AssociationEndMembers)
+            {
+                MemberPath endPrefix = new MemberPath(prefix, endMember);
+                EntityType entityType = MetadataHelper.GetEntityTypeForEnd(endMember);
+                ExtentKey primaryKey = GetPrimaryKeyForEntityType(endPrefix, entityType);
+                keyFields.AddRange(primaryKey.KeyFields);
+            }
+            ExtentKey key = new ExtentKey(keyFields);
+            return key;
+        }
+
+        internal string ToUserString()
+        {
+            string result = StringUtil.ToCommaSeparatedStringSorted(m_keyFields);
+            return result;
+        }
+
+        internal override void ToCompactString(StringBuilder builder)
+        {
+            StringUtil.ToCommaSeparatedStringSorted(builder, m_keyFields);
+        }
+        #endregion
+    }
+}

mcs/class/referencesource/System.Data.Entity/System/Data/Mapping/ViewGeneration/Validation/KeyConstraint.cs

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+//---------------------------------------------------------------------
+// <copyright file="KeyConstraint.cs" company="Microsoft">
+//      Copyright (c) Microsoft Corporation.  All rights reserved.
+// </copyright>
+//
+// @owner [....]
+// @backupOwner [....]
+//---------------------------------------------------------------------
+
+using System.Data.Common.Utils;
+using System.Collections.Generic;
+using System.Text;
+using System.Diagnostics;
+
+namespace System.Data.Mapping.ViewGeneration.Validation
+{
+    // Class representing a key constraint for particular cellrelation
+    internal class KeyConstraint<TCellRelation, TSlot> : InternalBase
+        where TCellRelation : CellRelation
+    {
+
+        #region Constructor
+        //  Constructs a key constraint for the given relation and keyslots
+        //  with comparer being the comparison operator for comparing various
+        //  keyslots in Implies, etc
+        internal KeyConstraint(TCellRelation relation, IEnumerable<TSlot> keySlots, IEqualityComparer<TSlot> comparer)
+        {
+            m_relation = relation;
+            m_keySlots = new Set<TSlot>(keySlots, comparer).MakeReadOnly();
+            Debug.Assert(m_keySlots.Count > 0, "Key constraint being created without any keyslots?");
+        }
+        #endregion
+
+        #region Fields
+        private TCellRelation m_relation;
+        private Set<TSlot> m_keySlots;
+        #endregion
+
+        #region Properties
+        protected TCellRelation CellRelation
+        {
+            get { return m_relation; }
+        }
+
+        protected Set<TSlot> KeySlots
+        {
+            get { return m_keySlots; }
+        }
+        #endregion
+
+        #region Methods
+        internal override void ToCompactString(StringBuilder builder)
+        {
+            StringUtil.FormatStringBuilder(builder, "Key (V{0}) - ", m_relation.CellNumber);
+            StringUtil.ToSeparatedStringSorted(builder, KeySlots, ", ");
+            // The slots contain the name of the relation: So we skip
+            // printing the CellRelation
+        }
+        #endregion
+    }
+}

mcs/class/referencesource/System.Data.Entity/System/Data/Mapping/ViewGeneration/Validation/SchemaConstraints.cs

@@ -0,0 +1,70 @@
+//---------------------------------------------------------------------
+// <copyright file="SchemaConstraints.cs" company="Microsoft">
+//      Copyright (c) Microsoft Corporation.  All rights reserved.
+// </copyright>
+//
+// @owner [....]
+// @backupOwner [....]
+//---------------------------------------------------------------------
+
+
+using System.Data.Common.Utils;
+using System.Collections.Generic;
+using System.Text;
+
+namespace System.Data.Mapping.ViewGeneration.Validation
+{
+    /// <summary>
+    /// A class representing a set of constraints. It uses generic parameters
+    /// so that we can get strong typing and avoid downcasts
+    /// </summary>
+    internal class SchemaConstraints<TKeyConstraint> : InternalBase
+    where TKeyConstraint : InternalBase
+    {
+
+        #region Constructor
+        // effects: Creates an empty set of constraints
+        internal SchemaConstraints()
+        {
+            m_keyConstraints = new List<TKeyConstraint>();
+        }
+        #endregion
+
+        #region Fields
+        // Use different lists so we can enumerate the right kind of constraints
+        private List<TKeyConstraint> m_keyConstraints;
+        #endregion
+
+        #region Properties
+        internal IEnumerable<TKeyConstraint> KeyConstraints
+        {
+            get { return m_keyConstraints; }
+        }
+        #endregion
+
+        #region Methods
+        // effects: Adds a key constraint to this
+        internal void Add(TKeyConstraint constraint)
+        {
+            EntityUtil.CheckArgumentNull(constraint, "constraint");
+            m_keyConstraints.Add(constraint);
+        }
+
+        // effects: Converts constraints to human-readable strings and adds them to builder
+        private static void ConstraintsToBuilder<Constraint>(IEnumerable<Constraint> constraints, StringBuilder builder)
+            where Constraint : InternalBase
+        {
+            foreach (Constraint constraint in constraints)
+            {
+                constraint.ToCompactString(builder);
+                builder.Append(Environment.NewLine);
+            }
+        }
+
+        internal override void ToCompactString(StringBuilder builder)
+        {
+            ConstraintsToBuilder(m_keyConstraints, builder);
+        }
+        #endregion
+    }
+}

mcs/class/referencesource/System.Data.Entity/System/Data/Mapping/ViewGeneration/Validation/ViewCellRelation.cs

@@ -0,0 +1,95 @@
+//---------------------------------------------------------------------
+// <copyright file="ViewCellRelation.cs" company="Microsoft">
+//      Copyright (c) Microsoft Corporation.  All rights reserved.
+// </copyright>
+//
+// @owner [....]
+// @backupOwner [....]
+//---------------------------------------------------------------------
+
+using System.Collections.Generic;
+using System.Data.Mapping.ViewGeneration.Structures;
+using System.Text;
+using System.Data.Common.Utils;
+
+
+namespace System.Data.Mapping.ViewGeneration.Validation
+{
+    /// <summary>
+    /// Represents a relation signature that lists all projected
+    /// slots of two cell queries in a cell after projection. So if
+    /// SPerson1.Disc is present in the cellquery (and part of the where
+    /// clause) but not in the projected slots, it is missing from a ViewCellRelation
+    /// </summary>
+    internal class ViewCellRelation : CellRelation
+    {
+
+        #region Constructor
+        // effects: Creates a view cell relation for "cell" with the
+        // projected slots given by slots -- cellNumber is the number of the
+        // cell for debugging purposes
+        // Also creates the BasicCellRelations for the left and right cell queries
+        internal ViewCellRelation(Cell cell, List<ViewCellSlot> slots, int cellNumber)
+            : base(cellNumber)
+        {
+            m_cell = cell;
+            m_slots = slots;
+            // We create the basiccellrelations  passing this to it so that we have
+            // a reference from the basiccellrelations to this
+            m_cell.CQuery.CreateBasicCellRelation(this);
+            m_cell.SQuery.CreateBasicCellRelation(this);
+        }
+        #endregion
+
+        #region Fields
+        private Cell m_cell; // The cell for which this relation exists
+        private List<ViewCellSlot> m_slots; // Slots projected from both cell queries
+        #endregion
+
+        #region Properties
+        internal Cell Cell
+        {
+            get { return m_cell; }
+        }
+        #endregion
+
+
+        #region Methods
+        // requires: slot corresponds to a slot in the corresponding
+        // BasicCellRelation
+        // effects: Given a slot in the corresponding basicCellRelation,
+        // looks up the slot in this viewcellrelation and returns it. Returns
+        // null if it does not find the slot in the left or right side of the viewrelation
+        internal ViewCellSlot LookupViewSlot(MemberProjectedSlot slot)
+        {
+            // CHANGE_[....]_IMPROVE: We could have a dictionary to speed this up
+            foreach (ViewCellSlot viewSlot in m_slots)
+            {
+                // If the left or right slots are equal, return the viewSlot
+                if (ProjectedSlot.EqualityComparer.Equals(slot, viewSlot.CSlot) ||
+                    ProjectedSlot.EqualityComparer.Equals(slot, viewSlot.SSlot))
+                {
+                    return viewSlot;
+                }
+            }
+            return null;
+        }
+
+        protected override int GetHash()
+        {
+            // Note: Using CLR-Hashcode
+            return m_cell.GetHashCode();
+            // We need not hash the slots, etc - cell should give us enough
+            // differentiation and land the relation into the same bucket
+        }
+
+        internal override void ToCompactString(StringBuilder builder)
+        {
+            builder.Append("ViewRel[");
+            m_cell.ToCompactString(builder);
+            // StringUtil.ToSeparatedStringSorted(builder, m_slots, ", ");
+            builder.Append(']');
+        }
+        #endregion
+    }
+}

mcs/class/referencesource/System.Data.Entity/System/Data/Mapping/ViewGeneration/Validation/ViewCellSlot.cs

@@ -0,0 +1,148 @@
+//---------------------------------------------------------------------
+// <copyright file="ViewCellSlot.cs" company="Microsoft">
+//      Copyright (c) Microsoft Corporation.  All rights reserved.
+// </copyright>
+//
+// @owner [....]
+// @backupOwner [....]
+//---------------------------------------------------------------------
+
+namespace System.Data.Mapping.ViewGeneration.Validation
+{
+    using System.Collections.Generic;
+    using System.Data.Common.CommandTrees;
+    using System.Data.Common.Utils;
+    using System.Data.Mapping.ViewGeneration.Structures;
+    using System.Diagnostics;
+    using System.Text;
+
+    /// <summary>
+    /// Represents a slot that is projected by C and S queries in a cell.
+    /// </summary>
+    internal class ViewCellSlot : ProjectedSlot
+    {
+        #region Constructor
+        // effects: 
+        /// <summary>
+        /// Creates a view cell slot that corresponds to <paramref name="slotNum"/> in some cell. The <paramref name="cSlot"/> and <paramref name="sSlot"/> represent the
+        /// slots in the left and right queries of the view cell.
+        /// </summary>
+        internal ViewCellSlot(int slotNum, MemberProjectedSlot cSlot, MemberProjectedSlot sSlot)
+        {
+            m_slotNum = slotNum;
+            m_cSlot = cSlot;
+            m_sSlot = sSlot;
+        }
+        #endregion
+
+        #region Fields
+        private readonly int m_slotNum;
+        private readonly MemberProjectedSlot m_cSlot;
+        private readonly MemberProjectedSlot m_sSlot;
+        #endregion
+
+        #region Properties
+        /// <summary>
+        /// Returns the slot corresponding to the left cellquery.
+        /// </summary>
+        internal MemberProjectedSlot CSlot
+        {
+            get { return m_cSlot; }
+        }
+
+        /// <summary>
+        /// Returns the slot corresponding to the right cellquery.
+        /// </summary>
+        internal MemberProjectedSlot SSlot
+        {
+            get { return m_sSlot; }
+        }
+        #endregion
+
+        #region Comparer/String Methods
+        protected override bool IsEqualTo(ProjectedSlot right)
+        {
+            ViewCellSlot rightSlot = right as ViewCellSlot;
+            if (rightSlot == null)
+            {
+                return false;
+            }
+
+            return m_slotNum == rightSlot.m_slotNum &&
+                MemberProjectedSlot.EqualityComparer.Equals(m_cSlot, rightSlot.m_cSlot) &&
+                MemberProjectedSlot.EqualityComparer.Equals(m_sSlot, rightSlot.m_sSlot);
+        }
+
+        protected override int GetHash()
+        {
+            return MemberProjectedSlot.EqualityComparer.GetHashCode(m_cSlot) ^
+                   MemberProjectedSlot.EqualityComparer.GetHashCode(m_sSlot) ^
+                   m_slotNum;
+        }
+
+        /// <summary>
+        /// Given a list of <paramref name="slots"/>, converts the left/right slots (if left is true/false) to a human-readable string.
+        /// </summary>
+        internal static string SlotsToUserString(IEnumerable<ViewCellSlot> slots, bool isFromCside)
+        {
+            StringBuilder builder = new StringBuilder();
+            bool first = true;
+            foreach (ViewCellSlot slot in slots)
+            {
+                if (false == first)
+                {
+                    builder.Append(", ");
+                }
+                builder.Append(SlotToUserString(slot, isFromCside));
+                first = false;
+            }
+            return builder.ToString();
+        }
+
+        internal static string SlotToUserString(ViewCellSlot slot, bool isFromCside)
+        {
+            MemberProjectedSlot actualSlot = isFromCside ? slot.CSlot : slot.SSlot;
+            string result = StringUtil.FormatInvariant("{0}", actualSlot);
+            return result;
+        }
+
+        /// <summary>
+        /// Not supported in this class.
+        /// </summary>
+        internal override string GetCqlFieldAlias(MemberPath outputMember)
+        {
+            Debug.Fail("Should not be called.");
+            return null; // To keep the compiler happy
+        }
+
+        /// <summary>
+        /// Not supported in this class.
+        /// </summary>
+        internal override StringBuilder AsEsql(StringBuilder builder, MemberPath outputMember, string blockAlias, int indentLevel)
+        {
+            Debug.Fail("Should not be called.");
+            return null; // To keep the compiler happy
+        }
+
+        /// <summary>
+        /// Not supported in this class.
+        /// </summary>
+        internal override DbExpression AsCqt(DbExpression row, MemberPath outputMember)
+        {
+            Debug.Fail("Should not be called.");
+            return null;
+        }
+
+        internal override void ToCompactString(StringBuilder builder)
+        {
+            builder.Append('<');
+            StringUtil.FormatStringBuilder(builder, "{0}", m_slotNum);
+            builder.Append(':');
+            m_cSlot.ToCompactString(builder);
+            builder.Append('-');
+            m_sSlot.ToCompactString(builder);
+            builder.Append('>');
+        }
+        #endregion
+    }
+}

mcs/class/referencesource/System.Data.Entity/System/Data/Mapping/ViewGeneration/Validation/ViewKeyConstraint.cs

@@ -0,0 +1,191 @@
+//---------------------------------------------------------------------
+// <copyright file="ViewKeyConstraint.cs" company="Microsoft">
+//      Copyright (c) Microsoft Corporation.  All rights reserved.
+// </copyright>
+//
+// @owner [....]
+// @backupOwner [....]
+//---------------------------------------------------------------------
+
+namespace System.Data.Mapping.ViewGeneration.Validation
+{
+    using System.Collections.Generic;
+    using System.Data.Common.Utils;
+    using System.Data.Entity;
+    using System.Data.Mapping.ViewGeneration.Structures;
+    using System.Data.Mapping.ViewGeneration.Utils;
+    using System.Data.Metadata.Edm;
+    using System.Text;
+
+    // Class representing a key constraint on the view cell relations
+    internal class ViewKeyConstraint : KeyConstraint<ViewCellRelation, ViewCellSlot>
+    {
+
+
+        #region Constructor
+        //  effects: Constructs a key constraint for the given relation and keyslots
+        internal ViewKeyConstraint(ViewCellRelation relation, IEnumerable<ViewCellSlot> keySlots) :
+            base(relation, keySlots, ProjectedSlot.EqualityComparer)
+        {
+        }
+        #endregion
+
+        #region Properties
+        // effects: Returns the cell corresponding to this constraint
+        internal Cell Cell
+        {
+            get { return CellRelation.Cell; }
+        }
+        #endregion
+
+        #region Methods
+        internal bool Implies(ViewKeyConstraint second)
+        {
+            if (false == Object.ReferenceEquals(CellRelation, second.CellRelation))
+            {
+                return false;
+            }
+            // Check if the slots in this key are a subset of slots in
+            // second. If it is a key in this e.g., <A.pid> then <A.pid,
+            // A.foo> is certainly a key as well
+
+            if (KeySlots.IsSubsetOf(second.KeySlots))
+            {
+                return true;
+            }
+
+            // Now check for subsetting taking referential constraints into account
+            // Check that each slot in KeySlots can be found in second.KeySlots if we take
+            // slot equivalence into account
+
+            Set<ViewCellSlot> secondKeySlots = new Set<ViewCellSlot>(second.KeySlots);
+
+            foreach (ViewCellSlot firstSlot in KeySlots)
+            {
+                bool found = false; // Need to find a match for firstSlot
+
+                foreach (ViewCellSlot secondSlot in secondKeySlots)
+                {
+                    if (ProjectedSlot.EqualityComparer.Equals(firstSlot.SSlot, secondSlot.SSlot))
+                    {
+                        // S-side is the same. Check if C-side is the same as well. If so, remove it
+                        // from secondKeySlots
+                        // We have to check for C-side equivalence in terms of actual equality
+                        // and equivalence via ref constraints. The former is needed since the
+                        // S-side key slots would typically be mapped to the same C-side slot.
+                        // The latter is needed since the same S-side key slot could be mapped
+                        // into two slots on the C-side that are connected via a ref constraint
+                        MemberPath path1 = firstSlot.CSlot.MemberPath;
+                        MemberPath path2 = secondSlot.CSlot.MemberPath;
+                        if (MemberPath.EqualityComparer.Equals(path1, path2) || path1.IsEquivalentViaRefConstraint(path2))
+                        {
+                            secondKeySlots.Remove(secondSlot);
+                            found = true;
+                            break;
+                        }
+                    }
+                }
+                if (found == false)
+                {
+                    return false;
+                }
+
+            }
+
+            // The subsetting holds when referential constraints are taken into account
+            return true;
+        }
+
+        // effects: Given the fact that rightKeyConstraint is not implied by a
+        // leftSide key constraint, return a useful error message -- some S
+        // was not implied by the C key constraints
+        internal static ErrorLog.Record GetErrorRecord(ViewKeyConstraint rightKeyConstraint)
+        {
+            List<ViewCellSlot> keySlots = new List<ViewCellSlot>(rightKeyConstraint.KeySlots);
+            EntitySetBase table = keySlots[0].SSlot.MemberPath.Extent;
+            EntitySetBase cSet = keySlots[0].CSlot.MemberPath.Extent;
+
+            MemberPath tablePrefix = new MemberPath(table);
+            MemberPath cSetPrefix = new MemberPath(cSet);
+
+            ExtentKey tableKey = ExtentKey.GetPrimaryKeyForEntityType(tablePrefix, (EntityType)table.ElementType);
+            ExtentKey cSetKey = null;
+            if (cSet is EntitySet)
+            {
+                cSetKey = ExtentKey.GetPrimaryKeyForEntityType(cSetPrefix, (EntityType)cSet.ElementType);
+            }
+            else
+            {
+                cSetKey = ExtentKey.GetKeyForRelationType(cSetPrefix, (AssociationType)cSet.ElementType);
+            }
+
+            string message = Strings.ViewGen_KeyConstraint_Violation(
+                                           table.Name,
+                                           ViewCellSlot.SlotsToUserString(rightKeyConstraint.KeySlots, false /*isFromCside*/),
+                                           tableKey.ToUserString(),
+                                           cSet.Name,
+                                           ViewCellSlot.SlotsToUserString(rightKeyConstraint.KeySlots, true /*isFromCside*/),
+                                           cSetKey.ToUserString());
+
+            string debugMessage = StringUtil.FormatInvariant("PROBLEM: Not implied {0}", rightKeyConstraint);
+            return new ErrorLog.Record(true, ViewGenErrorCode.KeyConstraintViolation, message, rightKeyConstraint.CellRelation.Cell, debugMessage);
+        }
+
+        // effects: Given the fact that none of the rightKeyConstraint are not implied by a
+        // leftSide key constraint, return a useful error message (used for
+        // the Update requirement 
+        internal static ErrorLog.Record GetErrorRecord(IEnumerable<ViewKeyConstraint> rightKeyConstraints)
+        {
+            ViewKeyConstraint rightKeyConstraint = null;
+            StringBuilder keyBuilder = new StringBuilder();
+            bool isFirst = true;
+            foreach (ViewKeyConstraint rightConstraint in rightKeyConstraints)
+            {
+                string keyMsg = ViewCellSlot.SlotsToUserString(rightConstraint.KeySlots, true /*isFromCside*/);
+                if (isFirst == false)
+                {
+                    keyBuilder.Append("; ");
+                }
+                isFirst = false;
+                keyBuilder.Append(keyMsg);
+                rightKeyConstraint = rightConstraint;
+            }
+
+            List<ViewCellSlot> keySlots = new List<ViewCellSlot>(rightKeyConstraint.KeySlots);
+            EntitySetBase table = keySlots[0].SSlot.MemberPath.Extent;
+            EntitySetBase cSet = keySlots[0].CSlot.MemberPath.Extent;
+
+            MemberPath tablePrefix = new MemberPath(table);
+            ExtentKey tableKey = ExtentKey.GetPrimaryKeyForEntityType(tablePrefix, (EntityType)table.ElementType);
+
+            string message;
+            if (cSet is EntitySet)
+            {
+                message = System.Data.Entity.Strings.ViewGen_KeyConstraint_Update_Violation_EntitySet(keyBuilder.ToString(), cSet.Name,
+                                        tableKey.ToUserString(), table.Name);
+            }
+            else
+            {
+                //For a 1:* or 0..1:* association, the * side has to be mapped to the
+                //key properties of the table. Fior this specific case, we give out a specific message
+                //that is specific for this case.
+                AssociationSet associationSet = (AssociationSet)cSet;
+                AssociationEndMember endMember = Helper.GetEndThatShouldBeMappedToKey(associationSet.ElementType);
+                if(endMember != null)
+                {
+                    message = System.Data.Entity.Strings.ViewGen_AssociationEndShouldBeMappedToKey(endMember.Name,
+                                        table.Name);
+                }
+                else
+                {
+                    message = System.Data.Entity.Strings.ViewGen_KeyConstraint_Update_Violation_AssociationSet(cSet.Name,
+                                        tableKey.ToUserString(), table.Name);
+                }
+            }
+
+            string debugMessage = StringUtil.FormatInvariant("PROBLEM: Not implied {0}", rightKeyConstraint);
+            return new ErrorLog.Record(true, ViewGenErrorCode.KeyConstraintUpdateViolation, message, rightKeyConstraint.CellRelation.Cell, debugMessage);
+        }
+        #endregion
+    }
+}