Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / DataEntity / System / Data / Query / InternalTrees / relpropertyhelper.cs / 1305376 / relpropertyhelper.cs
//---------------------------------------------------------------------- //// Copyright (c) Microsoft Corporation. All rights reserved. // // // @owner [....] // @backupOwner [....] //--------------------------------------------------------------------- using System; using System.Collections.Generic; using System.Globalization; using System.Diagnostics; using System.Data.Common; using System.Data.Metadata.Edm; namespace System.Data.Query.InternalTrees { ////// A "Rel" property is best thought of as a collocated reference (aka foreign key). /// Any entity may have zero or more rel-properties carried along with it (purely /// as a means to optimize for common relationship traversal scenarios) /// /// Although the definition is lax here, we only deal with RelProperties that /// are one-ended (ie) the target multiplicity is at most One. /// /// Consider for example, an Order entity with a (N:1) Order-Customer relationship. The Customer ref /// will be treated as a rel property for the Order entity. /// Similarly, the OrderLine entity may have an Order ref rel property (assuming that there was /// a N:1 relationship between OrderLine and Order) /// internal sealed class RelProperty { #region private state private readonly RelationshipType m_relationshipType; private readonly RelationshipEndMember m_fromEnd; private readonly RelationshipEndMember m_toEnd; #endregion #region constructors internal RelProperty(RelationshipType relationshipType, RelationshipEndMember fromEnd, RelationshipEndMember toEnd) { m_relationshipType = relationshipType; m_fromEnd = fromEnd; m_toEnd = toEnd; } #endregion #region public APIs ////// The relationship /// public RelationshipType Relationship { get { return m_relationshipType; } } ////// The source end of the relationship /// public RelationshipEndMember FromEnd { get { return m_fromEnd; } } ////// the target end of the relationship /// public RelationshipEndMember ToEnd { get { return m_toEnd; } } ////// Our definition of equality /// /// ///public override bool Equals(object obj) { RelProperty other = obj as RelProperty; return (other != null && this.Relationship.EdmEquals(other.Relationship) && this.FromEnd.EdmEquals(other.FromEnd) && this.ToEnd.EdmEquals(other.ToEnd)); } /// /// our hash code /// ///public override int GetHashCode() { return this.ToEnd.Identity.GetHashCode(); } /// /// String form /// ///[DebuggerNonUserCode] public override string ToString() { return m_relationshipType.ToString() + ":" + m_fromEnd.ToString() + ":" + m_toEnd.ToString(); } #endregion } /// /// A helper class for all rel-properties /// internal sealed class RelPropertyHelper { #region private state private Dictionary> _relPropertyMap; private HashSet _interestingRelProperties; #endregion #region private methods /// /// Add the rel property induced by the specified relationship, (if the target /// end has a multiplicity of one) /// We only keep track of rel-properties that are "interesting" /// /// the association relationship /// source end of the relationship traversal /// target end of the traversal private void AddRelProperty(AssociationType associationType, AssociationEndMember fromEnd, AssociationEndMember toEnd) { if (toEnd.RelationshipMultiplicity == RelationshipMultiplicity.Many) { return; } RelProperty prop = new RelProperty(associationType, fromEnd, toEnd); if (_interestingRelProperties == null || !_interestingRelProperties.Contains(prop)) { return; } EntityTypeBase entityType = (EntityTypeBase)((RefType)fromEnd.TypeUsage.EdmType).ElementType; ListpropList; if (!_relPropertyMap.TryGetValue(entityType, out propList)) { propList = new List (); _relPropertyMap[entityType] = propList; } propList.Add(prop); } /// /// Add any rel properties that are induced by the supplied relationship /// /// the relationship private void ProcessRelationship(RelationshipType relationshipType) { AssociationType associationType = relationshipType as AssociationType; if (associationType == null) { return; } // Handle only binary associations if (associationType.AssociationEndMembers.Count != 2) { return; } AssociationEndMember end0 = associationType.AssociationEndMembers[0]; AssociationEndMember end1 = associationType.AssociationEndMembers[1]; AddRelProperty(associationType, end0, end1); AddRelProperty(associationType, end1, end0); } #endregion #region constructors internal RelPropertyHelper(MetadataWorkspace ws, HashSetinterestingRelProperties) { _relPropertyMap = new Dictionary >(); _interestingRelProperties = interestingRelProperties; foreach (RelationshipType relationshipType in ws.GetItems (DataSpace.CSpace)) { ProcessRelationship(relationshipType); } } #endregion #region public APIs /// /// Get the rel properties declared by this type (and *not* by any of its subtypes) /// /// the entity type ///set of rel properties declared for this type internal IEnumerableGetDeclaredOnlyRelProperties(EntityTypeBase entityType) { List relProperties; if (_relPropertyMap.TryGetValue(entityType, out relProperties)) { foreach (RelProperty p in relProperties) { yield return p; } } yield break; } /// /// Get the rel-properties of this entity and its supertypes (starting from the root) /// /// the entity type ///set of rel-properties for this entity type (and its supertypes) internal IEnumerableGetRelProperties(EntityTypeBase entityType) { if (entityType.BaseType != null) { foreach (RelProperty p in GetRelProperties(entityType.BaseType as EntityTypeBase)) { yield return p; } } foreach (RelProperty p in GetDeclaredOnlyRelProperties(entityType)) { yield return p; } } #endregion } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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