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/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / DataEntity / System / Data / EntityModel / SchemaObjectModel / ReferentialConstraint.cs / 1305376 / 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; bool areAllPrinicipalRolePropertiesNullable, areAllDependentRolePropertiesNullable; bool isDependentRolePropertiesSubsetofKeyProperties, isPrinicipalRolePropertiesSubsetofKeyProperties; bool isAnyPrinicipalRolePropertyNullable, isAnyDependentRolePropertyNullable; // 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 areAllDependentRolePropertiesNullable, out isAnyDependentRolePropertyNullable, 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 areAllPrinicipalRolePropertiesNullable, out isAnyPrinicipalRolePropertyNullable, 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 { bool v1Behavior = Schema.SchemaVersion <= XmlConstants.EdmVersionForV1_1; // Determine expected multiplicities RelationshipMultiplicity expectedPrincipalMultiplicity = (v1Behavior ? areAllPrinicipalRolePropertiesNullable : isAnyPrinicipalRolePropertyNullable) ? RelationshipMultiplicity.ZeroOrOne : RelationshipMultiplicity.One; RelationshipMultiplicity expectedDependentMultiplicity = (v1Behavior ? areAllDependentRolePropertiesNullable : isAnyDependentRolePropertyNullable) ? RelationshipMultiplicity.ZeroOrOne : RelationshipMultiplicity.Many; principalRoleEnd.Multiplicity = principalRoleEnd.Multiplicity ?? expectedPrincipalMultiplicity; dependentRoleEnd.Multiplicity = dependentRoleEnd.Multiplicity ?? expectedDependentMultiplicity; // 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 // for v2+ if (principalRoleEnd.Multiplicity == RelationshipMultiplicity.Many) { AddError(ErrorCode.InvalidMultiplicityInRoleInRelationshipConstraint, EdmSchemaErrorSeverity.Error, System.Data.Entity.Strings.InvalidMultiplicityFromRoleUpperBoundMustBeOne(_principalRole.Name, this.ParentElement.Name)); } else if (areAllDependentRolePropertiesNullable && principalRoleEnd.Multiplicity == RelationshipMultiplicity.One) { string message = System.Data.Entity.Strings.InvalidMultiplicityFromRoleToPropertyNullableV1(_principalRole.Name, this.ParentElement.Name); AddError(ErrorCode.InvalidMultiplicityInRoleInRelationshipConstraint, EdmSchemaErrorSeverity.Error, message); } else if (( (v1Behavior && !areAllDependentRolePropertiesNullable) || (!v1Behavior && !isAnyDependentRolePropertyNullable) ) && principalRoleEnd.Multiplicity != RelationshipMultiplicity.One) { string message; if (v1Behavior) { message = System.Data.Entity.Strings.InvalidMultiplicityFromRoleToPropertyNonNullableV1(_principalRole.Name, this.ParentElement.Name); } else { message = System.Data.Entity.Strings.InvalidMultiplicityFromRoleToPropertyNonNullableV2(_principalRole.Name, this.ParentElement.Name); } AddError(ErrorCode.InvalidMultiplicityInRoleInRelationshipConstraint, EdmSchemaErrorSeverity.Error, message); } // 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 this is not a IsForeignKey // relationship. if ((!isDependentRolePropertiesSubsetofKeyProperties) && (!this.ParentElement.IsForeignKey) && (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, _dependentRole.End.Type.Identity, _principalRole.RoleProperties[i].Name, _principalRole.End.Type.Identity, this.ParentElement.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 areAllPropertiesNullable, out bool isAnyPropertyNullable, out bool isSubsetOfKeyProperties) { isKeyProperty = true; areAllPropertiesNullable = true; isAnyPropertyNullable = false; 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; } } areAllPropertiesNullable &= roleElement.RoleProperties[i].Property.Nullable; isAnyPropertyNullable |= 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.
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