Code:
/ Net / Net / 3.5.50727.3053 / DEVDIV / depot / DevDiv / releases / Orcas / SP / ndp / fx / src / DataEntity / System / Data / EntityModel / SchemaObjectModel / ReferentialConstraint.cs / 2 / ReferentialConstraint.cs
//---------------------------------------------------------------------- //// Copyright (c) Microsoft Corporation. All rights reserved. // // // @owner [....] // @backupOwner [....] //--------------------------------------------------------------------- using System; using System.Collections.Generic; using System.Diagnostics; using System.Xml; using System.Data; using System.Data.Metadata.Edm; namespace System.Data.EntityModel.SchemaObjectModel { ////// Represents an referential constraint on a relationship /// internal sealed class ReferentialConstraint : SchemaElement { private const char KEY_DELIMITER = ' '; private ReferentialConstraintRoleElement _principalRole; private ReferentialConstraintRoleElement _dependentRole; ////// construct a Referential constraint /// /// public ReferentialConstraint(Relationship relationship) : base(relationship) { } ////// Validate this referential constraint /// internal override void Validate() { base.Validate(); _principalRole.Validate(); _dependentRole.Validate(); if (ReadyForFurtherValidation(_principalRole) && ReadyForFurtherValidation(_dependentRole)) { // Validate the to end and from end of the referential constraint IRelationshipEnd principalRoleEnd = _principalRole.End; IRelationshipEnd dependentRoleEnd = _dependentRole.End; bool isPrinicipalRoleKeyProperty, isDependentRoleKeyProperty, isPrinicipalRolePropertiesNullable, isDependentRolePropertiesNullable, isDependentRolePropertiesSubsetofKeyProperties, isPrinicipalRolePropertiesSubsetofKeyProperties; // Validate the role name to be different if (_principalRole.Name == _dependentRole.Name) { AddError(ErrorCode.SameRoleReferredInReferentialConstraint, EdmSchemaErrorSeverity.Error, System.Data.Entity.Strings.SameRoleReferredInReferentialConstraint(this.ParentElement.Name)); } // Resolve all the property in the ToProperty attribute. Also checks whether this is nullable or not and // whether the properties are the keys for the type in the ToRole IsKeyProperty(_dependentRole, dependentRoleEnd.Type, out isPrinicipalRoleKeyProperty, out isDependentRolePropertiesNullable, out isDependentRolePropertiesSubsetofKeyProperties); // Resolve all the property in the ToProperty attribute. Also checks whether this is nullable or not and // whether the properties are the keys for the type in the ToRole IsKeyProperty(_principalRole, principalRoleEnd.Type, out isDependentRoleKeyProperty, out isPrinicipalRolePropertiesNullable, out isPrinicipalRolePropertiesSubsetofKeyProperties); Debug.Assert(_principalRole.RoleProperties.Count != 0, "There should be some ref properties in Principal Role"); Debug.Assert(_dependentRole.RoleProperties.Count != 0, "There should be some ref properties in Dependent Role"); // The properties in the PrincipalRole must be the key of the Entity type referred to by the principal role if (!isDependentRoleKeyProperty) { AddError(ErrorCode.InvalidPropertyInRelationshipConstraint, EdmSchemaErrorSeverity.Error, System.Data.Entity.Strings.InvalidFromPropertyInRelationshipConstraint( PrincipalRole.Name, principalRoleEnd.Type.FQName, this.ParentElement.FQName)); } else { // Since the FromProperty must be the key of the FromRole, the FromRole cannot be '*' as multiplicity // Also the lower bound of multiplicity of FromRole can be zero if and only if all the properties in // ToProperties are nullable if (principalRoleEnd.Multiplicity == RelationshipMultiplicity.Many) { AddError(ErrorCode.InvalidMultiplicityInRoleInRelationshipConstraint, EdmSchemaErrorSeverity.Error, System.Data.Entity.Strings.InvalidMultiplicityFromRoleUpperBoundMustBeOne(_principalRole.Name, this.ParentElement.Name)); } else if (isDependentRolePropertiesNullable && principalRoleEnd.Multiplicity == RelationshipMultiplicity.One) { AddError(ErrorCode.InvalidMultiplicityInRoleInRelationshipConstraint, EdmSchemaErrorSeverity.Error, System.Data.Entity.Strings.InvalidMultiplicityFromRoleToPropertyNullable(_principalRole.Name, this.ParentElement.Name)); } else if (!isDependentRolePropertiesNullable && principalRoleEnd.Multiplicity != RelationshipMultiplicity.One) { AddError(ErrorCode.InvalidMultiplicityInRoleInRelationshipConstraint, EdmSchemaErrorSeverity.Error, System.Data.Entity.Strings.InvalidMultiplicityFromRoleToPropertyNonNullable(_principalRole.Name, this.ParentElement.Name)); } // If the ToProperties form the key of the type in ToRole, then the upper bound of the multiplicity // of the ToRole must be '1'. The lower bound must always be zero since there can be entries in the from // column which are not related to child columns. if (dependentRoleEnd.Multiplicity == RelationshipMultiplicity.One && Schema.DataModel == SchemaDataModelOption.ProviderDataModel) { AddError(ErrorCode.InvalidMultiplicityInRoleInRelationshipConstraint, EdmSchemaErrorSeverity.Error, System.Data.Entity.Strings.InvalidMultiplicityToRoleLowerBoundMustBeZero(_dependentRole.Name, this.ParentElement.Name)); } //Need to constrain the dependent role in CSDL to Key properties if ((!isDependentRolePropertiesSubsetofKeyProperties) && (Schema.DataModel == SchemaDataModelOption.EntityDataModel)) { AddError(ErrorCode.InvalidPropertyInRelationshipConstraint, EdmSchemaErrorSeverity.Error, System.Data.Entity.Strings.InvalidToPropertyInRelationshipConstraint( DependentRole.Name, dependentRoleEnd.Type.FQName, this.ParentElement.FQName)); } // If the ToProperty is a key property, then the upper bound must be 1 i.e. every parent (from property) can // have exactly one child if (isPrinicipalRoleKeyProperty) { if (dependentRoleEnd.Multiplicity == RelationshipMultiplicity.Many) { AddError(ErrorCode.InvalidMultiplicityInRoleInRelationshipConstraint, EdmSchemaErrorSeverity.Error, System.Data.Entity.Strings.InvalidMultiplicityToRoleUpperBoundMustBeOne(dependentRoleEnd.Name, this.ParentElement.Name)); } } // if the ToProperty is not the key, then the upper bound must be many i.e every parent (from property) can // be related to many childs else if (dependentRoleEnd.Multiplicity != RelationshipMultiplicity.Many) { AddError(ErrorCode.InvalidMultiplicityInRoleInRelationshipConstraint, EdmSchemaErrorSeverity.Error, System.Data.Entity.Strings.InvalidMultiplicityToRoleUpperBoundMustBeMany(dependentRoleEnd.Name, this.ParentElement.Name)); } if (_dependentRole.RoleProperties.Count != _principalRole.RoleProperties.Count) { AddError(ErrorCode.MismatchNumberOfPropertiesInRelationshipConstraint, EdmSchemaErrorSeverity.Error, System.Data.Entity.Strings.MismatchNumberOfPropertiesinRelationshipConstraint); } else { for (int i = 0; i < _dependentRole.RoleProperties.Count; i++) { if (_dependentRole.RoleProperties[i].Property.Type != _principalRole.RoleProperties[i].Property.Type) { AddError(ErrorCode.TypeMismatchRelationshipConstaint, EdmSchemaErrorSeverity.Error, System.Data.Entity.Strings.TypeMismatchRelationshipConstaint( _dependentRole.RoleProperties[i].Name, _principalRole.RoleProperties[i].Name)); } } } } } } private static bool ReadyForFurtherValidation(ReferentialConstraintRoleElement role) { if (role == null) return false; if(role.End == null) return false; if(role.RoleProperties.Count == 0) return false; foreach(PropertyRefElement propRef in role.RoleProperties) { if(propRef.Property == null) return false; } return true; } ////// Resolves the given property names to the property in the item /// Also checks whether the properties form the key for the given type and whether all the properties are nullable or not /// /// /// /// /// /// private static void IsKeyProperty(ReferentialConstraintRoleElement roleElement, SchemaEntityType itemType, out bool isKeyProperty, out bool isNullable, out bool isSubsetOfKeyProperties) { isKeyProperty = true; isNullable = true; isSubsetOfKeyProperties = true; if (itemType.KeyProperties.Count != roleElement.RoleProperties.Count) { isKeyProperty = false; } // Checking that ToProperties must be the key properties in the entity type referred by the ToRole for (int i = 0; i < roleElement.RoleProperties.Count; i++) { // Once we find that the properties in the constraint are not a subset of the // Key, one need not search for it every time if (isSubsetOfKeyProperties) { bool foundKeyProperty = false; // All properties that are defined in ToProperties must be the key property on the entity type for (int j = 0; j < itemType.KeyProperties.Count; j++) { if (itemType.KeyProperties[j].Property == roleElement.RoleProperties[i].Property) { foundKeyProperty = true; break; } } if (!foundKeyProperty) { isKeyProperty = false; isSubsetOfKeyProperties = false; } } isNullable &= roleElement.RoleProperties[i].Property.Nullable; } } protected override bool HandleAttribute(XmlReader reader) { return false; } protected override bool HandleElement(XmlReader reader) { if (base.HandleElement(reader)) { return true; } else if (CanHandleElement(reader, XmlConstants.PrincipalRole)) { HandleReferentialConstraintPrincipalRoleElement(reader); return true; } else if (CanHandleElement(reader, XmlConstants.DependentRole)) { HandleReferentialConstraintDependentRoleElement(reader); return true; } return false; } internal void HandleReferentialConstraintPrincipalRoleElement(XmlReader reader) { _principalRole = new ReferentialConstraintRoleElement(this); _principalRole.Parse(reader); } internal void HandleReferentialConstraintDependentRoleElement(XmlReader reader) { _dependentRole = new ReferentialConstraintRoleElement(this); _dependentRole.Parse(reader); } internal override void ResolveTopLevelNames() { _dependentRole.ResolveTopLevelNames(); _principalRole.ResolveTopLevelNames(); } ////// The parent element as an IRelationship /// internal new IRelationship ParentElement { get { return (IRelationship)(base.ParentElement); } } internal ReferentialConstraintRoleElement PrincipalRole { get { return _principalRole; } } internal ReferentialConstraintRoleElement DependentRole { get { return _dependentRole; } } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. //---------------------------------------------------------------------- //// Copyright (c) Microsoft Corporation. All rights reserved. // // // @owner [....] // @backupOwner [....] //--------------------------------------------------------------------- using System; using System.Collections.Generic; using System.Diagnostics; using System.Xml; using System.Data; using System.Data.Metadata.Edm; namespace System.Data.EntityModel.SchemaObjectModel { ////// Represents an referential constraint on a relationship /// internal sealed class ReferentialConstraint : SchemaElement { private const char KEY_DELIMITER = ' '; private ReferentialConstraintRoleElement _principalRole; private ReferentialConstraintRoleElement _dependentRole; ////// construct a Referential constraint /// /// public ReferentialConstraint(Relationship relationship) : base(relationship) { } ////// Validate this referential constraint /// internal override void Validate() { base.Validate(); _principalRole.Validate(); _dependentRole.Validate(); if (ReadyForFurtherValidation(_principalRole) && ReadyForFurtherValidation(_dependentRole)) { // Validate the to end and from end of the referential constraint IRelationshipEnd principalRoleEnd = _principalRole.End; IRelationshipEnd dependentRoleEnd = _dependentRole.End; bool isPrinicipalRoleKeyProperty, isDependentRoleKeyProperty, isPrinicipalRolePropertiesNullable, isDependentRolePropertiesNullable, isDependentRolePropertiesSubsetofKeyProperties, isPrinicipalRolePropertiesSubsetofKeyProperties; // Validate the role name to be different if (_principalRole.Name == _dependentRole.Name) { AddError(ErrorCode.SameRoleReferredInReferentialConstraint, EdmSchemaErrorSeverity.Error, System.Data.Entity.Strings.SameRoleReferredInReferentialConstraint(this.ParentElement.Name)); } // Resolve all the property in the ToProperty attribute. Also checks whether this is nullable or not and // whether the properties are the keys for the type in the ToRole IsKeyProperty(_dependentRole, dependentRoleEnd.Type, out isPrinicipalRoleKeyProperty, out isDependentRolePropertiesNullable, out isDependentRolePropertiesSubsetofKeyProperties); // Resolve all the property in the ToProperty attribute. Also checks whether this is nullable or not and // whether the properties are the keys for the type in the ToRole IsKeyProperty(_principalRole, principalRoleEnd.Type, out isDependentRoleKeyProperty, out isPrinicipalRolePropertiesNullable, out isPrinicipalRolePropertiesSubsetofKeyProperties); Debug.Assert(_principalRole.RoleProperties.Count != 0, "There should be some ref properties in Principal Role"); Debug.Assert(_dependentRole.RoleProperties.Count != 0, "There should be some ref properties in Dependent Role"); // The properties in the PrincipalRole must be the key of the Entity type referred to by the principal role if (!isDependentRoleKeyProperty) { AddError(ErrorCode.InvalidPropertyInRelationshipConstraint, EdmSchemaErrorSeverity.Error, System.Data.Entity.Strings.InvalidFromPropertyInRelationshipConstraint( PrincipalRole.Name, principalRoleEnd.Type.FQName, this.ParentElement.FQName)); } else { // Since the FromProperty must be the key of the FromRole, the FromRole cannot be '*' as multiplicity // Also the lower bound of multiplicity of FromRole can be zero if and only if all the properties in // ToProperties are nullable if (principalRoleEnd.Multiplicity == RelationshipMultiplicity.Many) { AddError(ErrorCode.InvalidMultiplicityInRoleInRelationshipConstraint, EdmSchemaErrorSeverity.Error, System.Data.Entity.Strings.InvalidMultiplicityFromRoleUpperBoundMustBeOne(_principalRole.Name, this.ParentElement.Name)); } else if (isDependentRolePropertiesNullable && principalRoleEnd.Multiplicity == RelationshipMultiplicity.One) { AddError(ErrorCode.InvalidMultiplicityInRoleInRelationshipConstraint, EdmSchemaErrorSeverity.Error, System.Data.Entity.Strings.InvalidMultiplicityFromRoleToPropertyNullable(_principalRole.Name, this.ParentElement.Name)); } else if (!isDependentRolePropertiesNullable && principalRoleEnd.Multiplicity != RelationshipMultiplicity.One) { AddError(ErrorCode.InvalidMultiplicityInRoleInRelationshipConstraint, EdmSchemaErrorSeverity.Error, System.Data.Entity.Strings.InvalidMultiplicityFromRoleToPropertyNonNullable(_principalRole.Name, this.ParentElement.Name)); } // If the ToProperties form the key of the type in ToRole, then the upper bound of the multiplicity // of the ToRole must be '1'. The lower bound must always be zero since there can be entries in the from // column which are not related to child columns. if (dependentRoleEnd.Multiplicity == RelationshipMultiplicity.One && Schema.DataModel == SchemaDataModelOption.ProviderDataModel) { AddError(ErrorCode.InvalidMultiplicityInRoleInRelationshipConstraint, EdmSchemaErrorSeverity.Error, System.Data.Entity.Strings.InvalidMultiplicityToRoleLowerBoundMustBeZero(_dependentRole.Name, this.ParentElement.Name)); } //Need to constrain the dependent role in CSDL to Key properties if ((!isDependentRolePropertiesSubsetofKeyProperties) && (Schema.DataModel == SchemaDataModelOption.EntityDataModel)) { AddError(ErrorCode.InvalidPropertyInRelationshipConstraint, EdmSchemaErrorSeverity.Error, System.Data.Entity.Strings.InvalidToPropertyInRelationshipConstraint( DependentRole.Name, dependentRoleEnd.Type.FQName, this.ParentElement.FQName)); } // If the ToProperty is a key property, then the upper bound must be 1 i.e. every parent (from property) can // have exactly one child if (isPrinicipalRoleKeyProperty) { if (dependentRoleEnd.Multiplicity == RelationshipMultiplicity.Many) { AddError(ErrorCode.InvalidMultiplicityInRoleInRelationshipConstraint, EdmSchemaErrorSeverity.Error, System.Data.Entity.Strings.InvalidMultiplicityToRoleUpperBoundMustBeOne(dependentRoleEnd.Name, this.ParentElement.Name)); } } // if the ToProperty is not the key, then the upper bound must be many i.e every parent (from property) can // be related to many childs else if (dependentRoleEnd.Multiplicity != RelationshipMultiplicity.Many) { AddError(ErrorCode.InvalidMultiplicityInRoleInRelationshipConstraint, EdmSchemaErrorSeverity.Error, System.Data.Entity.Strings.InvalidMultiplicityToRoleUpperBoundMustBeMany(dependentRoleEnd.Name, this.ParentElement.Name)); } if (_dependentRole.RoleProperties.Count != _principalRole.RoleProperties.Count) { AddError(ErrorCode.MismatchNumberOfPropertiesInRelationshipConstraint, EdmSchemaErrorSeverity.Error, System.Data.Entity.Strings.MismatchNumberOfPropertiesinRelationshipConstraint); } else { for (int i = 0; i < _dependentRole.RoleProperties.Count; i++) { if (_dependentRole.RoleProperties[i].Property.Type != _principalRole.RoleProperties[i].Property.Type) { AddError(ErrorCode.TypeMismatchRelationshipConstaint, EdmSchemaErrorSeverity.Error, System.Data.Entity.Strings.TypeMismatchRelationshipConstaint( _dependentRole.RoleProperties[i].Name, _principalRole.RoleProperties[i].Name)); } } } } } } private static bool ReadyForFurtherValidation(ReferentialConstraintRoleElement role) { if (role == null) return false; if(role.End == null) return false; if(role.RoleProperties.Count == 0) return false; foreach(PropertyRefElement propRef in role.RoleProperties) { if(propRef.Property == null) return false; } return true; } ////// Resolves the given property names to the property in the item /// Also checks whether the properties form the key for the given type and whether all the properties are nullable or not /// /// /// /// /// /// private static void IsKeyProperty(ReferentialConstraintRoleElement roleElement, SchemaEntityType itemType, out bool isKeyProperty, out bool isNullable, out bool isSubsetOfKeyProperties) { isKeyProperty = true; isNullable = true; isSubsetOfKeyProperties = true; if (itemType.KeyProperties.Count != roleElement.RoleProperties.Count) { isKeyProperty = false; } // Checking that ToProperties must be the key properties in the entity type referred by the ToRole for (int i = 0; i < roleElement.RoleProperties.Count; i++) { // Once we find that the properties in the constraint are not a subset of the // Key, one need not search for it every time if (isSubsetOfKeyProperties) { bool foundKeyProperty = false; // All properties that are defined in ToProperties must be the key property on the entity type for (int j = 0; j < itemType.KeyProperties.Count; j++) { if (itemType.KeyProperties[j].Property == roleElement.RoleProperties[i].Property) { foundKeyProperty = true; break; } } if (!foundKeyProperty) { isKeyProperty = false; isSubsetOfKeyProperties = false; } } isNullable &= roleElement.RoleProperties[i].Property.Nullable; } } protected override bool HandleAttribute(XmlReader reader) { return false; } protected override bool HandleElement(XmlReader reader) { if (base.HandleElement(reader)) { return true; } else if (CanHandleElement(reader, XmlConstants.PrincipalRole)) { HandleReferentialConstraintPrincipalRoleElement(reader); return true; } else if (CanHandleElement(reader, XmlConstants.DependentRole)) { HandleReferentialConstraintDependentRoleElement(reader); return true; } return false; } internal void HandleReferentialConstraintPrincipalRoleElement(XmlReader reader) { _principalRole = new ReferentialConstraintRoleElement(this); _principalRole.Parse(reader); } internal void HandleReferentialConstraintDependentRoleElement(XmlReader reader) { _dependentRole = new ReferentialConstraintRoleElement(this); _dependentRole.Parse(reader); } internal override void ResolveTopLevelNames() { _dependentRole.ResolveTopLevelNames(); _principalRole.ResolveTopLevelNames(); } ////// The parent element as an IRelationship /// internal new IRelationship ParentElement { get { return (IRelationship)(base.ParentElement); } } internal ReferentialConstraintRoleElement PrincipalRole { get { return _principalRole; } } internal ReferentialConstraintRoleElement DependentRole { get { return _dependentRole; } } } } // 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
- UIElementHelper.cs
- odbcmetadatacolumnnames.cs
- WindowsSolidBrush.cs
- GridToolTip.cs
- PointAnimationUsingKeyFrames.cs
- ListBoxDesigner.cs
- StringCollection.cs
- MessageQueueAccessControlEntry.cs
- ContainerSelectorActiveEvent.cs
- RunInstallerAttribute.cs
- DigestTraceRecordHelper.cs
- ApplicationInfo.cs
- SpeakInfo.cs
- NullableIntMinMaxAggregationOperator.cs
- ResetableIterator.cs
- DataKeyCollection.cs
- WindowsAuthenticationEventArgs.cs
- IntranetCredentialPolicy.cs
- ComplexObject.cs
- UpdatePanelControlTrigger.cs
- DataGridRow.cs
- ClientFormsAuthenticationCredentials.cs
- RSAPKCS1SignatureFormatter.cs
- CompositeFontParser.cs
- AuthenticationModuleElementCollection.cs
- SettingsBase.cs
- SQLBytesStorage.cs
- ImportRequest.cs
- TargetControlTypeCache.cs
- RowParagraph.cs
- CodePageEncoding.cs
- SQLDecimal.cs
- ValidationRule.cs
- XmlReturnWriter.cs
- ContainerUIElement3D.cs
- StructuredProperty.cs
- FileSystemInfo.cs
- SymmetricAlgorithm.cs
- MarkupWriter.cs
- SafeHandles.cs
- ProfileEventArgs.cs
- Visual3D.cs
- CriticalExceptions.cs
- ResXDataNode.cs
- Stack.cs
- precedingquery.cs
- InvokeAction.cs
- EventMap.cs
- HttpFileCollection.cs
- IISMapPath.cs
- Schema.cs
- RtfFormatStack.cs
- CorrelationManager.cs
- RemoteWebConfigurationHostStream.cs
- IIS7WorkerRequest.cs
- XmlDictionaryWriter.cs
- OracleTransaction.cs
- UnknownWrapper.cs
- FunctionGenerator.cs
- WorkflowValidationFailedException.cs
- MultipleViewPattern.cs
- URLMembershipCondition.cs
- NetworkInformationException.cs
- RequiredFieldValidator.cs
- XmlNodeReader.cs
- Enumerable.cs
- TcpAppDomainProtocolHandler.cs
- MenuItemCollection.cs
- D3DImage.cs
- InputBinding.cs
- HasCopySemanticsAttribute.cs
- coordinatorscratchpad.cs
- DataServiceProviderMethods.cs
- CredentialCache.cs
- GroupDescription.cs
- QilXmlWriter.cs
- GridViewRowPresenterBase.cs
- DispatcherHooks.cs
- SimpleNameService.cs
- TimelineGroup.cs
- TextElement.cs
- StrongNamePublicKeyBlob.cs
- LinqDataSourceInsertEventArgs.cs
- ColumnMapProcessor.cs
- IdentitySection.cs
- XmlHierarchicalDataSourceView.cs
- FileRecordSequenceHelper.cs
- SchemaComplexType.cs
- ComboBoxAutomationPeer.cs
- StylusTip.cs
- SetterBaseCollection.cs
- GAC.cs
- TextDecorationCollection.cs
- WindowsAuthenticationEventArgs.cs
- FactoryId.cs
- GetPageCompletedEventArgs.cs
- FileNotFoundException.cs
- DecimalKeyFrameCollection.cs
- SortDescriptionCollection.cs
- FlowDocumentReader.cs