AssociationType.cs source code in C# .NET

                        Code:
                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / DataEntity / System / Data / Metadata / Edm / AssociationType.cs / 1305376 / AssociationType.cs
                        
                        
                            //---------------------------------------------------------------------- 
// 
//      Copyright (c) Microsoft Corporation.  All rights reserved.
// 
// 
// @owner       [....]
// @backupOwner [....] 
//--------------------------------------------------------------------- 
using System;
using System.Collections.Generic; 
using System.Data.Common;
using System.Text;
using System.Threading;
using System.Diagnostics; 

namespace System.Data.Metadata.Edm 
{ 
    /// 
    /// Represents the Edm Association Type 
    /// 
    public sealed class AssociationType : RelationshipType
    {
        #region Constructors 
        /// 
        /// Initializes a new instance of Association Type with the given name, namespace, version and ends 
        ///  
        /// name of the association type
        /// namespace of the association type 
        /// is this a foreign key (FK) relationship?
        /// dataSpace in which this AssociationType belongs to
        /// Thrown if either the name, namespace or version attributes are null
        internal AssociationType(string name, 
                                 string namespaceName,
                                 bool foreignKey, 
                                 DataSpace dataSpace) 
            : base(name, namespaceName, dataSpace)
        { 
            _referentialConstraints = new ReadOnlyMetadataCollection(new MetadataCollection());
            _isForeignKey = foreignKey;
        }
        #endregion 

        #region Fields 
        private readonly ReadOnlyMetadataCollection _referentialConstraints; 
        private FilteredReadOnlyMetadataCollection _associationEndMembers;
        private readonly bool _isForeignKey; 
        #endregion

        #region Properties
        ///  
        /// Returns the kind of the type
        ///  
        public override BuiltInTypeKind BuiltInTypeKind { get { return BuiltInTypeKind.AssociationType; } } 

        ///  
        /// Returns the list of ends for this association type
        /// 
        public ReadOnlyMetadataCollection AssociationEndMembers
        { 
            get
            { 
                Debug.Assert(IsReadOnly, "this is a wrapper around this.Members, don't call it during metadata loading, only call it after the metadata is set to readonly"); 
                if (null == _associationEndMembers)
                { 
                    Interlocked.CompareExchange(ref _associationEndMembers,
                        new FilteredReadOnlyMetadataCollection(
                            this.Members, Helper.IsAssociationEndMember), null);
                } 
                return _associationEndMembers;
            } 
        } 

        ///  
        /// Returns the list of constraints for this association type
        /// 
        [MetadataProperty(BuiltInTypeKind.ReferentialConstraint, true)]
        public ReadOnlyMetadataCollection ReferentialConstraints 
        {
            get 
            { 
                return _referentialConstraints;
            } 
        }

        /// 
        /// Indicates whether this is a foreign key relationship. 
        /// 
        [MetadataProperty(PrimitiveTypeKind.Boolean, false)] 
        public bool IsForeignKey 
        {
            get 
            {
                return _isForeignKey;
            }
        } 
        #endregion
 
        #region Methods 

        ///  
        /// Validates a EdmMember object to determine if it can be added to this type's
        /// Members collection. If this method returns without throwing, it is assumed
        /// the member is valid.
        ///  
        /// The member to validate
        /// Thrown if the member is not an AssociationEndMember 
        internal override void ValidateMemberForAdd(EdmMember member) 
        {
            Debug.Assert( 
                (member is AssociationEndMember),
                "Only members of type AssociationEndMember may be added to Association definitions.");
        }
 
        /// 
        /// Sets this item to be readonly, once this is set, the item will never be writable again. 
        ///  
        internal override void SetReadOnly()
        { 
            if (!IsReadOnly)
            {
                base.SetReadOnly();
                this.ReferentialConstraints.Source.SetReadOnly(); 
            }
        } 
 
        /// 
        /// Add the given referential constraint to the collection of referential constraints 
        /// 
        /// 
        internal void AddReferentialConstraint(ReferentialConstraint referentialConstraint)
        { 
            this.ReferentialConstraints.Source.Add(referentialConstraint);
        } 
        #endregion 
    }
} 

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

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