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/ 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 ReadOnlyMetadataCollectionAssociationEndMembers { 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 ReadOnlyMetadataCollectionReferentialConstraints { 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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