146 lines
4.8 KiB
C#
146 lines
4.8 KiB
C#
//---------------------------------------------------------------------
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// <copyright file="ReferentialConstraintRoleElement.cs" company="Microsoft">
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// Copyright (c) Microsoft Corporation. All rights reserved.
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// </copyright>
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//
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// @owner [....]
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// @backupOwner [....]
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//---------------------------------------------------------------------
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namespace System.Data.EntityModel.SchemaObjectModel
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{
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using System;
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using System.Collections.Generic;
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using System.Data.Metadata.Edm;
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using System.Diagnostics;
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using System.Xml;
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/// <summary>
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/// Represents an role element in referential constraint element.
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/// </summary>
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internal sealed class ReferentialConstraintRoleElement : SchemaElement
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{
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private List<PropertyRefElement> _roleProperties;
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private IRelationshipEnd _end;
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/// <summary>
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/// Constructs an EntityContainerAssociationSetEnd
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/// </summary>
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/// <param name="parentElement">Reference to the schema element.</param>
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public ReferentialConstraintRoleElement(ReferentialConstraint parentElement)
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: base( parentElement )
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{
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}
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public IList<PropertyRefElement> RoleProperties
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{
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get
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{
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if (_roleProperties == null)
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{
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_roleProperties = new List<PropertyRefElement>();
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}
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return _roleProperties;
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}
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}
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public IRelationshipEnd End
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{
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get
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{
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return _end;
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}
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}
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protected override bool HandleElement(XmlReader reader)
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{
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if (base.HandleElement(reader))
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{
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return true;
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}
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else if (CanHandleElement(reader, XmlConstants.PropertyRef))
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{
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HandlePropertyRefElement(reader);
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return true;
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}
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return false;
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}
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protected override bool HandleAttribute(XmlReader reader)
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{
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if (CanHandleAttribute(reader, XmlConstants.Role))
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{
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HandleRoleAttribute(reader);
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return true;
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}
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return false;
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}
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/// <summary>
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///
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/// </summary>
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/// <param name="reader"></param>
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private void HandlePropertyRefElement(XmlReader reader)
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{
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PropertyRefElement property = new PropertyRefElement(ParentElement);
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property.Parse(reader);
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this.RoleProperties.Add(property);
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}
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private void HandleRoleAttribute(XmlReader reader)
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{
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string roleName;
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Utils.GetString(Schema, reader, out roleName);
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this.Name = roleName;
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}
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/// <summary>
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/// Used during the resolve phase to resolve the type name to the object that represents that type
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/// </summary>
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internal override void ResolveTopLevelNames()
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{
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Debug.Assert(!String.IsNullOrEmpty(this.Name), "RoleName should never be empty");
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IRelationship relationship = (IRelationship)this.ParentElement.ParentElement;
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if (!relationship.TryGetEnd(this.Name, out _end))
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{
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AddError(ErrorCode.InvalidRoleInRelationshipConstraint,
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EdmSchemaErrorSeverity.Error,
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System.Data.Entity.Strings.InvalidEndRoleInRelationshipConstraint(this.Name, relationship.Name));
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return;
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}
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// we are gauranteed that the _end has gone through ResolveNames, but
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// we are not gauranteed that it was successful
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if (_end.Type == null)
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{
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// an error has already been added for this
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return;
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}
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}
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internal override void Validate()
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{
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base.Validate();
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// we can't resolve these names until validate because they will reference properties and types
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// that may not be resolved when this objects ResolveNames gets called
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Debug.Assert(_roleProperties != null, "xsd should have verified that there should be atleast one property ref element in referential role element");
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foreach (PropertyRefElement property in _roleProperties)
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{
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if (!property.ResolveNames((SchemaEntityType)_end.Type))
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{
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AddError(ErrorCode.InvalidPropertyInRelationshipConstraint,
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EdmSchemaErrorSeverity.Error,
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System.Data.Entity.Strings.InvalidPropertyInRelationshipConstraint(
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property.Name,
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this.Name));
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}
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}
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}
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}
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}
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