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/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / DataEntity / System / Data / Metadata / Edm / EntitySet.cs / 1305376 / EntitySet.cs
//---------------------------------------------------------------------- //// Copyright (c) Microsoft Corporation. All rights reserved. // // // @owner [....] // @backupOwner [....] //--------------------------------------------------------------------- using System; using System.Collections.Generic; using System.Text; using System.Diagnostics; using System.Threading; using System.Data.Common.Utils; using System.Collections.ObjectModel; namespace System.Data.Metadata.Edm { ////// concrete Class for representing a entity set /// public class EntitySet : EntitySetBase { #region Constructors ////// The constructor for constructing the EntitySet with a given name and an entity type /// /// The name of the EntitySet /// The db schema /// The db table /// The provider specific query that should be used to retrieve the EntitySet /// The entity type of the entities that this entity set type contains ///Thrown if the argument name or entityType is null internal EntitySet(string name, string schema, string table, string definingQuery, EntityType entityType) : base(name, schema, table, definingQuery, entityType) { } #endregion #region Fields private ReadOnlyCollection> _foreignKeyDependents; private ReadOnlyCollection > _foreignKeyPrincipals; private volatile bool _hasForeignKeyRelationships; private volatile bool _hasIndependentRelationships; #endregion #region Properties /// /// Returns the kind of the type /// public override BuiltInTypeKind BuiltInTypeKind { get { return BuiltInTypeKind.EntitySet; } } ////// Gets/Sets the entity type of this entity set /// public new EntityType ElementType { get { return (EntityType)base.ElementType; } } ////// Returns the associations and constraints where "this" EntitySet particpates as the Principal end. /// From the results of this list, you can retrieve the Dependent IRelatedEnds /// internal ReadOnlyCollection> ForeignKeyDependents { get { if (_foreignKeyDependents == null) { InitializeForeignKeyLists(); } return _foreignKeyDependents; } } /// /// Returns the associations and constraints where "this" EntitySet particpates as the Dependent end. /// From the results of this list, you can retrieve the Principal IRelatedEnds /// internal ReadOnlyCollection> ForeignKeyPrincipals { get { if (_foreignKeyPrincipals == null) { InitializeForeignKeyLists(); } return _foreignKeyPrincipals; } } /// /// True if this entity set participates in any foreign key relationships, otherwise false. /// internal bool HasForeignKeyRelationships { get { if (_foreignKeyPrincipals == null) { InitializeForeignKeyLists(); } return _hasForeignKeyRelationships; } } ////// True if this entity set participates in any independent relationships, otherwise false. /// internal bool HasIndependentRelationships { get { if (_foreignKeyPrincipals == null) { InitializeForeignKeyLists(); } return _hasIndependentRelationships; } } #endregion #region Methods private void InitializeForeignKeyLists() { var dependents = new List>(); var principals = new List >(); bool foundFkRelationship = false; bool foundIndependentRelationship = false; foreach (AssociationSet associationSet in MetadataHelper.GetAssociationsForEntitySet(this)) { if (associationSet.ElementType.IsForeignKey) { foundFkRelationship = true; Debug.Assert(associationSet.ElementType.ReferentialConstraints.Count == 1, "Expected exactly one constraint for FK"); ReferentialConstraint constraint = associationSet.ElementType.ReferentialConstraints[0]; if (constraint.ToRole.GetEntityType().IsAssignableFrom(this.ElementType) || this.ElementType.IsAssignableFrom(constraint.ToRole.GetEntityType())) { // Dependents dependents.Add(new Tuple (associationSet, constraint)); } if (constraint.FromRole.GetEntityType().IsAssignableFrom(this.ElementType) || this.ElementType.IsAssignableFrom(constraint.FromRole.GetEntityType())) { // Principals principals.Add(new Tuple (associationSet, constraint)); } } else { foundIndependentRelationship = true; } } _hasForeignKeyRelationships = foundFkRelationship; _hasIndependentRelationships = foundIndependentRelationship; var readOnlyDependents = dependents.AsReadOnly(); var readOnlyPrincipals = principals.AsReadOnly(); Interlocked.CompareExchange(ref _foreignKeyDependents, readOnlyDependents, null); Interlocked.CompareExchange(ref _foreignKeyPrincipals, readOnlyPrincipals, null); } #endregion } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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