BasicKeyConstraint.cs source code in C# .NET

Source code for the .NET framework in C#

                        

Code:

/ Net / Net / 3.5.50727.3053 / DEVDIV / depot / DevDiv / releases / Orcas / SP / ndp / fx / src / DataEntity / System / Data / Map / ViewGeneration / Validation / BasicKeyConstraint.cs / 1 / 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, JoinTreeSlot.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 (JoinTreeSlot 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.
//---------------------------------------------------------------------- 
// 
//      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, JoinTreeSlot.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 (JoinTreeSlot 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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