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//---------------------------------------------------------------------
// <copyright file="EntityKeyElement.cs" company="Microsoft">
// Copyright (c) Microsoft Corporation. All rights reserved.
// </copyright>
//
// @owner Microsoft
// @backupOwner Microsoft
//---------------------------------------------------------------------
namespace System.Data.EntityModel.SchemaObjectModel
{
using System;
using System.Collections.Generic;
using System.Data.Entity;
using System.Data.Metadata.Edm;
using System.Diagnostics;
using System.Xml;
/// <summary>
/// Represents an Key element in an EntityType element.
/// </summary>
internal sealed class EntityKeyElement : SchemaElement
{
private List<PropertyRefElement> _keyProperties;
/// <summary>
/// Constructs an EntityContainerAssociationSetEnd
/// </summary>
/// <param name="parentElement">Reference to the schema element.</param>
public EntityKeyElement( SchemaEntityType parentElement )
: base( parentElement )
{
}
public IList<PropertyRefElement> KeyProperties
{
get
{
if (_keyProperties == null)
{
_keyProperties = new List<PropertyRefElement>();
}
return _keyProperties;
}
}
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.PropertyRef))
{
HandlePropertyRefElement(reader);
return true;
}
return false;
}
/// <summary>
///
/// </summary>
/// <param name="reader"></param>
private void HandlePropertyRefElement(XmlReader reader)
{
PropertyRefElement property = new PropertyRefElement((SchemaEntityType)ParentElement);
property.Parse(reader);
this.KeyProperties.Add(property);
}
/// <summary>
/// Used during the resolve phase to resolve the type name to the object that represents that type
/// </summary>
internal override void ResolveTopLevelNames()
{
Debug.Assert(_keyProperties != null, "xsd should have verified that there should be atleast one property ref element");
foreach (PropertyRefElement property in _keyProperties)
{
if (!property.ResolveNames((SchemaEntityType)this.ParentElement))
{
AddError(ErrorCode.InvalidKey, EdmSchemaErrorSeverity.Error, System.Data.Entity.Strings.InvalidKeyNoProperty(this.ParentElement.FQName, property.Name));
}
}
}
/// <summary>
/// Validate all the key properties
/// </summary>
internal override void Validate()
{
Debug.Assert(_keyProperties != null, "xsd should have verified that there should be atleast one property ref element");
Dictionary<string, PropertyRefElement> propertyLookUp = new Dictionary<string, PropertyRefElement>(StringComparer.Ordinal);
foreach (PropertyRefElement keyProperty in _keyProperties)
{
StructuredProperty property = keyProperty.Property;
Debug.Assert(property != null, "This should never be null, since if we were not able to resolve, we should have never reached to this point");
if (propertyLookUp.ContainsKey(property.Name))
{
AddError(ErrorCode.DuplicatePropertySpecifiedInEntityKey, EdmSchemaErrorSeverity.Error,
System.Data.Entity.Strings.DuplicatePropertyNameSpecifiedInEntityKey(this.ParentElement.FQName, property.Name));
continue;
}
propertyLookUp.Add(property.Name, keyProperty);
if (property.Nullable)
{
AddError(ErrorCode.InvalidKey, EdmSchemaErrorSeverity.Error,
System.Data.Entity.Strings.InvalidKeyNullablePart(property.Name, this.ParentElement.Name));
}
// currently we only support key properties of scalar type
if (!(property.Type is ScalarType || property.Type is SchemaEnumType) || (property.CollectionKind != CollectionKind.None))
{
AddError(ErrorCode.EntityKeyMustBeScalar,
EdmSchemaErrorSeverity.Error,
System.Data.Entity.Strings.EntityKeyMustBeScalar(property.Name, this.ParentElement.Name));
continue;
}
// Enum properties are never backed by binary or spatial type so we can skip the checks here
if (!(property.Type is SchemaEnumType))
{
Debug.Assert(property.TypeUsage != null, "For scalar type, typeusage must be initialized");
PrimitiveType primitivePropertyType = (PrimitiveType)property.TypeUsage.EdmType;
if (Schema.DataModel == SchemaDataModelOption.EntityDataModel)
{
// Binary keys are only supported for V2.0 CSDL, Spatial keys are not supported.
if ((primitivePropertyType.PrimitiveTypeKind == PrimitiveTypeKind.Binary && Schema.SchemaVersion < XmlConstants.EdmVersionForV2) ||
Helper.IsSpatialType(primitivePropertyType))
{
AddError(ErrorCode.EntityKeyTypeCurrentlyNotSupported,
EdmSchemaErrorSeverity.Error,
Strings.EntityKeyTypeCurrentlyNotSupported(property.Name, this.ParentElement.FQName, primitivePropertyType.PrimitiveTypeKind));
}
}
else
{
Debug.Assert(SchemaDataModelOption.ProviderDataModel == Schema.DataModel, "Invalid DataModel encountered");
// Binary keys are only supported for V2.0 SSDL, Spatial keys are not supported.
if ((primitivePropertyType.PrimitiveTypeKind == PrimitiveTypeKind.Binary && Schema.SchemaVersion < XmlConstants.StoreVersionForV2) ||
Helper.IsSpatialType(primitivePropertyType))
{
AddError(ErrorCode.EntityKeyTypeCurrentlyNotSupported,
EdmSchemaErrorSeverity.Error,
Strings.EntityKeyTypeCurrentlyNotSupportedInSSDL(property.Name, this.ParentElement.FQName,
property.TypeUsage.EdmType.Name, property.TypeUsage.EdmType.BaseType.FullName, primitivePropertyType.PrimitiveTypeKind));
}
}
}
}
}
}
}
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