Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / DataEntity / System / Data / Map / ViewGeneration / QueryRewriting / FragmentQueryKB.cs / 1305376 / FragmentQueryKB.cs
//---------------------------------------------------------------------- //// Copyright (c) Microsoft Corporation. All rights reserved. // // // @owner [....] // @backupOwner [....] //--------------------------------------------------------------------- using System; using System.Diagnostics; using System.Collections.Generic; using System.Text; using System.Data.Common.Utils; using System.Data.Common.Utils.Boolean; using System.Data.Mapping.ViewGeneration.Structures; using System.Data.Metadata.Edm; using System.Linq; namespace System.Data.Mapping.ViewGeneration.QueryRewriting { internal class FragmentQueryKB : KnowledgeBase> { private BoolExpr > _kbExpression = TrueExpr >.Value; internal override void AddFact(BoolExpr > fact) { base.AddFact(fact); _kbExpression = new AndExpr >(_kbExpression, fact); } internal BoolExpr > KbExpression { get { return _kbExpression; } } internal void CreateVariableConstraints(EntitySetBase extent, MemberDomainMap domainMap, EdmItemCollection edmItemCollection) { CreateVariableConstraintsRecursion(extent.ElementType, new MemberPath(extent), domainMap, edmItemCollection); } internal void CreateAssociationConstraints(EntitySetBase extent, MemberDomainMap domainMap, EdmItemCollection edmItemCollection) { AssociationSet assocSet = extent as AssociationSet; if (assocSet != null) { BoolExpression assocSetExpr = BoolExpression.CreateLiteral(new RoleBoolean(assocSet), domainMap); //Set of Keys for this Association Set //need to key on EdmMember and EdmType because A, B subtype of C, can have the same id (EdmMember) that is defined in C. HashSet > associationkeys = new HashSet >(); //foreach end, add each Key foreach (var endMember in assocSet.ElementType.AssociationEndMembers) { EntityType type = (EntityType)((RefType)endMember.TypeUsage.EdmType).ElementType; type.KeyMembers.All(member => associationkeys.Add(new Pair (member, type)) || true /* prevent early termination */); } foreach (AssociationSetEnd end in assocSet.AssociationSetEnds) { // construct type condition HashSet derivedTypes = new HashSet (); derivedTypes.UnionWith(MetadataHelper.GetTypeAndSubtypesOf(end.CorrespondingAssociationEndMember.TypeUsage.EdmType, edmItemCollection, false)); BoolExpression typeCondition = CreateIsOfTypeCondition(new MemberPath(end.EntitySet), derivedTypes, domainMap); BoolExpression inRoleExpression = BoolExpression.CreateLiteral(new RoleBoolean(end), domainMap); BoolExpression inSetExpression = BoolExpression.CreateAnd( BoolExpression.CreateLiteral(new RoleBoolean(end.EntitySet), domainMap), typeCondition); // InRole -> (InSet AND type(Set)=T) AddImplication(inRoleExpression.Tree, inSetExpression.Tree); if (MetadataHelper.IsEveryOtherEndAtLeastOne(assocSet, end.CorrespondingAssociationEndMember)) { AddImplication(inSetExpression.Tree, inRoleExpression.Tree); } // Add equivalence between association set an End/Role if necessary. // Equivalence is added when a given association end's keys subsumes keys for // all the other association end. // For example: We have Entity Sets A[id1], B[id2, id3] and an association A_B between them. // Ref Constraint A.id1 = B.id2 // In this case, the Association Set has Key // id1 alone can not identify a unique tuple in the Association Set, but can. // Therefore we add a constraint: InSet(B) <=> InEnd(A_B.B) if (MetadataHelper.DoesEndKeySubsumeAssociationSetKey(assocSet, end.CorrespondingAssociationEndMember, associationkeys)) { AddEquivalence(inRoleExpression.Tree, assocSetExpr.Tree); } } // add rules for referential constraints (borrowed from LeftCellWrapper.cs) AssociationType assocType = assocSet.ElementType; foreach (ReferentialConstraint constraint in assocType.ReferentialConstraints) { AssociationEndMember toEndMember = (AssociationEndMember)constraint.ToRole; EntitySet toEntitySet = MetadataHelper.GetEntitySetAtEnd(assocSet, toEndMember); // Check if the keys of the entitySet's are equal to what is specified in the constraint // How annoying that KeyMembers returns EdmMember and not EdmProperty IEnumerable toProperties = Helpers.AsSuperTypeList (constraint.ToProperties); if (Helpers.IsSetEqual(toProperties, toEntitySet.ElementType.KeyMembers, EqualityComparer .Default)) { // Now check that the FromEnd is 1..1 (only then will all the Addresses be present in the assoc set) if (constraint.FromRole.RelationshipMultiplicity.Equals(RelationshipMultiplicity.One)) { // Make sure that the ToEnd is not 0..* because then the schema is broken Debug.Assert(constraint.ToRole.RelationshipMultiplicity.Equals(RelationshipMultiplicity.Many) == false); // Equate the ends BoolExpression inRoleExpression1 = BoolExpression.CreateLiteral(new RoleBoolean(assocSet.AssociationSetEnds[0]), domainMap); BoolExpression inRoleExpression2 = BoolExpression.CreateLiteral(new RoleBoolean(assocSet.AssociationSetEnds[1]), domainMap); AddEquivalence(inRoleExpression1.Tree, inRoleExpression2.Tree); } } } } } internal void CreateEquivalenceConstraintForOneToOneForeignKeyAssociation(AssociationSet assocSet, MemberDomainMap domainMap, EdmItemCollection edmItemCollection) { AssociationType assocType = assocSet.ElementType; foreach (ReferentialConstraint constraint in assocType.ReferentialConstraints) { AssociationEndMember toEndMember = (AssociationEndMember)constraint.ToRole; AssociationEndMember fromEndMember = (AssociationEndMember)constraint.FromRole; EntitySet toEntitySet = MetadataHelper.GetEntitySetAtEnd(assocSet, toEndMember); EntitySet fromEntitySet = MetadataHelper.GetEntitySetAtEnd(assocSet, fromEndMember); // Check if the keys of the entitySet's are equal to what is specified in the constraint IEnumerable toProperties = Helpers.AsSuperTypeList (constraint.ToProperties); if (Helpers.IsSetEqual(toProperties, toEntitySet.ElementType.KeyMembers, EqualityComparer .Default)) { //make sure that the method called with a 1:1 association Debug.Assert(constraint.FromRole.RelationshipMultiplicity.Equals(RelationshipMultiplicity.One)); Debug.Assert(constraint.ToRole.RelationshipMultiplicity.Equals(RelationshipMultiplicity.One)); // Create an Equivalence between the two Sets participating in this AssociationSet BoolExpression fromSetExpression = BoolExpression.CreateLiteral(new RoleBoolean(fromEntitySet), domainMap); BoolExpression toSetExpression = BoolExpression.CreateLiteral(new RoleBoolean(toEntitySet), domainMap); AddEquivalence(fromSetExpression.Tree, toSetExpression.Tree); } } } private void CreateVariableConstraintsRecursion(EdmType edmType, MemberPath currentPath, MemberDomainMap domainMap, EdmItemCollection edmItemCollection) { // Add the types can member have, i.e., its type and its subtypes HashSet possibleTypes = new HashSet (); possibleTypes.UnionWith(MetadataHelper.GetTypeAndSubtypesOf(edmType, edmItemCollection, true)); foreach (EdmType possibleType in possibleTypes) { // determine type domain HashSet derivedTypes = new HashSet (); derivedTypes.UnionWith(MetadataHelper.GetTypeAndSubtypesOf(possibleType, edmItemCollection, false)); if (derivedTypes.Count != 0) { BoolExpression typeCondition = CreateIsOfTypeCondition(currentPath, derivedTypes, domainMap); BoolExpression typeConditionComplement = BoolExpression.CreateNot(typeCondition); if (false == typeConditionComplement.IsSatisfiable()) { continue; } StructuralType structuralType = (StructuralType)possibleType; foreach (EdmProperty childProperty in structuralType.GetDeclaredOnlyMembers ()) { MemberPath childPath = new MemberPath(currentPath, childProperty); bool isScalar = MetadataHelper.IsNonRefSimpleMember(childProperty); if (domainMap.IsConditionMember(childPath) || domainMap.IsProjectedConditionMember(childPath)) { BoolExpression nullCondition; List childDomain = new List (domainMap.GetDomain(childPath)); if (isScalar) { nullCondition = BoolExpression.CreateLiteral(new ScalarRestriction(new MemberProjectedSlot(childPath), new Domain(ScalarConstant.Undefined, childDomain)), domainMap); } else { nullCondition = BoolExpression.CreateLiteral(new TypeRestriction(new MemberProjectedSlot(childPath), new Domain(TypeConstant.Undefined, childDomain)), domainMap); } // Properties not occuring in type are UNDEFINED AddEquivalence(typeConditionComplement.Tree, nullCondition.Tree); } // recurse into complex types if (false == isScalar) { CreateVariableConstraintsRecursion(childPath.EdmType, childPath, domainMap, edmItemCollection); } } } } } private static BoolExpression CreateIsOfTypeCondition(MemberPath currentPath, IEnumerable derivedTypes, MemberDomainMap domainMap) { Domain typeDomain = new Domain(derivedTypes.Select(derivedType => (Constant)new TypeConstant(derivedType)), domainMap.GetDomain(currentPath)); BoolExpression typeCondition = BoolExpression.CreateLiteral(new TypeRestriction(new MemberProjectedSlot(currentPath), typeDomain), domainMap); return typeCondition; } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007.
Link Menu
This book is available now!
Buy at Amazon US or
Buy at Amazon UK
- InsufficientMemoryException.cs
- DeviceContext2.cs
- EmissiveMaterial.cs
- ExpressionCopier.cs
- VisualStyleElement.cs
- RoutedEventValueSerializer.cs
- ControlType.cs
- CharKeyFrameCollection.cs
- SecureEnvironment.cs
- ObjectStateFormatter.cs
- XmlBaseReader.cs
- MailHeaderInfo.cs
- DataGridViewHitTestInfo.cs
- basemetadatamappingvisitor.cs
- IIS7UserPrincipal.cs
- IsolatedStoragePermission.cs
- LicenseProviderAttribute.cs
- RepeaterCommandEventArgs.cs
- MatrixKeyFrameCollection.cs
- InstanceDataCollection.cs
- DataGridColumnCollection.cs
- GridViewDeletedEventArgs.cs
- CustomSignedXml.cs
- EdmTypeAttribute.cs
- DataGridDetailsPresenterAutomationPeer.cs
- TabRenderer.cs
- CapiNative.cs
- UIElement.cs
- XmlTextReaderImplHelpers.cs
- HttpRuntime.cs
- Matrix.cs
- ClientRoleProvider.cs
- Drawing.cs
- BoundConstants.cs
- InputScopeNameConverter.cs
- SingleConverter.cs
- PrintPageEvent.cs
- FormatterServices.cs
- IteratorFilter.cs
- CodeParameterDeclarationExpression.cs
- DomNameTable.cs
- PackageDigitalSignature.cs
- DoubleIndependentAnimationStorage.cs
- UpDownBase.cs
- XPathCompileException.cs
- Policy.cs
- XmlSchemaSimpleContentExtension.cs
- DSASignatureFormatter.cs
- AutoGeneratedFieldProperties.cs
- PreviewKeyDownEventArgs.cs
- ToolStripDropDownMenu.cs
- MouseEventArgs.cs
- XmlNamespaceDeclarationsAttribute.cs
- OleDbCommand.cs
- CodeDomConfigurationHandler.cs
- QilUnary.cs
- InputScopeConverter.cs
- AssociationSet.cs
- SQLInt32Storage.cs
- path.cs
- DataGridViewRow.cs
- AttributeCollection.cs
- NavigationWindow.cs
- FixedElement.cs
- NullableBoolConverter.cs
- Transactions.cs
- DataGridLinkButton.cs
- PropertyIDSet.cs
- oledbconnectionstring.cs
- DeploymentExceptionMapper.cs
- SourceFileBuildProvider.cs
- StorageComplexTypeMapping.cs
- XPathPatternBuilder.cs
- CorrelationManager.cs
- ToolStripDropDownItem.cs
- SwitchAttribute.cs
- DbConnectionClosed.cs
- HostProtectionPermission.cs
- X509CertificateCollection.cs
- DynamicField.cs
- ProfileModule.cs
- UpdatePanelControlTrigger.cs
- XmlAnyElementAttribute.cs
- SamlEvidence.cs
- ControlTemplate.cs
- SendKeys.cs
- Context.cs
- EventDescriptorCollection.cs
- DataGridRow.cs
- ProtocolElement.cs
- ScrollViewerAutomationPeer.cs
- HtmlInputImage.cs
- ValidationErrorCollection.cs
- PlainXmlDeserializer.cs
- TreeNodeMouseHoverEvent.cs
- DynamicValidatorEventArgs.cs
- WebPartDescriptionCollection.cs
- XmlNamespaceDeclarationsAttribute.cs
- CollectionsUtil.cs
- WCFServiceClientProxyGenerator.cs