BasicKeyConstraint.cs source code in C# .NET

Source code for the .NET framework in C#

                        
Code:

                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / DataEntity / System / Data / Map / ViewGeneration / Validation / BasicKeyConstraint.cs / 1305376 / BasicKeyConstraint.cs
                        

                        
                            //---------------------------------------------------------------------- 
// 
//      Copyright (c) Microsoft Corporation.  All rights reserved.
// 
// 
// @owner [....]
// @backupOwner [....] 
//--------------------------------------------------------------------- 

 
using System.Data.Mapping.ViewGeneration.Structures;
using System.Collections.Generic;

namespace System.Data.Mapping.ViewGeneration.Validation 
{
 
    using BasicSchemaConstraints = SchemaConstraints; 

    // Class representing a key constraint on the basic cell relations 
    internal class BasicKeyConstraint : KeyConstraint
    {

        #region Constructor 
        //  Constructs a key constraint for the given relation and keyslots
        internal BasicKeyConstraint(BasicCellRelation relation, IEnumerable keySlots) : 
            base(relation, keySlots, MemberProjectedSlot.SpecificEqualityComparer) 
        {
        } 
        #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 viewSlots = new List();
            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 
    }
}

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.

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