ViewKeyConstraint.cs source code in C# .NET

                        Code:
                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / DataEntity / System / Data / Map / ViewGeneration / Validation / ViewKeyConstraint.cs / 1305376 / ViewKeyConstraint.cs
                        
                        
                            //---------------------------------------------------------------------- 
// 
//      Copyright (c) Microsoft Corporation.  All rights reserved.
// 
// 
// @owner [....]
// @backupOwner [....] 
//--------------------------------------------------------------------- 

using System.Collections.Generic; 
using System.Data.Mapping.ViewGeneration.Structures;
using System.Data.Mapping.ViewGeneration.Utils;
using System.Data.Common.Utils;
using System.Text; 
using System.Data.Metadata.Edm;
using System.Data.Entity; 
 
namespace System.Data.Mapping.ViewGeneration.Validation
{ 

    // Class representing a key constraint on the view cell relations
    internal class ViewKeyConstraint : KeyConstraint
    { 

 
        #region Constructor 
        //  effects: Constructs a key constraint for the given relation and keyslots
        internal ViewKeyConstraint(ViewCellRelation relation, IEnumerable keySlots) : 
            base(relation, keySlots, ViewCellSlot.SpecificEqualityComparer)
        {
        }
        #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.,  then  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 secondKeySlots = new Set(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 keySlots = new List(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_5(
                                           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 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 keySlots = new List(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_3(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_2(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 
    }
}

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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ViewKeyConstraint.cs source code in C# .NET

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