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using System.Data.Metadata.Edm;
using System.Diagnostics;
using System.Linq;
using System.Globalization;
using System.Reflection;
namespace System.Web.DynamicData.ModelProviders {
internal sealed class EFColumnProvider : ColumnProvider {
private EFTableProvider _table;
private EFAssociationProvider _association;
private bool _isAssociation;
private bool _isSortableProcessed;
private const string StoreGeneratedMetadata = "http://schemas.microsoft.com/ado/2009/02/edm/annotation:StoreGeneratedPattern";
public EFColumnProvider(EntityType entityType, EFTableProvider table, EdmMember m, bool isPrimaryKey)
: base(table) {
EdmMember = m;
IsPrimaryKey = isPrimaryKey;
_table = table;
MaxLength = 0;
Name = EdmMember.Name;
//
IsCustomProperty = false;
//
var property = EdmMember as EdmProperty;
if (property != null) {
IsForeignKeyComponent = DetermineIsForeignKeyComponent(property);
IsGenerated = IsServerGenerated(property);
}
ProcessFacets();
var navProp = m as NavigationProperty;
if (navProp != null) {
_isAssociation = true;
long key = EFAssociationProvider.BuildRelationshipKey(entityType, navProp.FromEndMember);
((EFDataModelProvider)table.DataModel).RelationshipEndLookup[key] = this;
}
}
private bool DetermineIsForeignKeyComponent(EdmProperty property) {
var navigationProperties = property.DeclaringType.Members.OfType<NavigationProperty>();
// Look at all NavigationProperties (i.e. strongly-type relationship columns) of the table this column belong to and
// see if there is a foreign key that matches this property
// If this is a 1 to 0..1 relationship and we are processing the more primary side. i.e in the Student in Student-StudentDetail
// and this is the primary key we don't want to check the relationship type since if there are no constraints we will treat the primary key as a foreign key.
return navigationProperties.Any(n => EFAssociationProvider.GetDependentPropertyNames(n, !IsPrimaryKey /* checkRelationshipType */).Contains(property.Name));
}
private static bool IsServerGenerated(EdmProperty property) {
MetadataProperty generated;
if (property.MetadataProperties.TryGetValue(StoreGeneratedMetadata, false, out generated)) {
return "Identity" == (string)generated.Value || "Computed" == (string)generated.Value;
}
return false;
}
private void ProcessFacets() {
foreach (Facet facet in EdmMember.TypeUsage.Facets) {
switch (facet.Name) {
case "MaxLength":
if (facet.IsUnbounded) {
// If it's marked as unbounded, treat it as max int
MaxLength = Int32.MaxValue;
}
else if (facet.Value != null && facet.Value is int) {
MaxLength = (int)facet.Value;
}
break;
case "Nullable":
Nullable = (bool)facet.Value;
break;
}
}
}
internal EdmMember EdmMember {
get;
private set;
}
#region IEntityMember Members
public override PropertyInfo EntityTypeProperty {
//
get { return _table.EntityType.GetProperty(Name); }
}
public override Type ColumnType {
get {
if (base.ColumnType == null) {
//
var edmType = EdmMember.TypeUsage.EdmType;
if (edmType is EntityType) {
base.ColumnType = ((EFDataModelProvider)this.Table.DataModel).GetClrType(edmType);
}
else if (edmType is CollectionType) {
// get the EdmType that this CollectionType is wrapping
base.ColumnType = ((EFDataModelProvider)this.Table.DataModel).GetClrType(((CollectionType)edmType).TypeUsage.EdmType);
}
else if (edmType is PrimitiveType) {
base.ColumnType = ((PrimitiveType)edmType).ClrEquivalentType;
}
else if (edmType is EnumType) {
base.ColumnType = ((EFDataModelProvider)this.Table.DataModel).GetClrType((EnumType)edmType);
}
else {
Debug.Assert(false, String.Format(CultureInfo.CurrentCulture, "Unknown EdmType {0}.", edmType.GetType().FullName));
}
}
return base.ColumnType;
}
}
public override bool IsSortable {
get {
if (!_isSortableProcessed) {
base.IsSortable = (ColumnType != typeof(byte[]));
_isSortableProcessed = true;
}
return base.IsSortable;
}
}
public override AssociationProvider Association {
get {
if (!_isAssociation) {
return null;
}
if (_association == null) {
_association = new EFAssociationProvider(this, (NavigationProperty)EdmMember);
}
return _association;
}
}
#endregion
internal static bool IsSupportedEdmMemberType(EdmMember member) {
var edmType = member.TypeUsage.EdmType;
return edmType is EntityType || edmType is CollectionType || edmType is PrimitiveType || edmType is EnumType;
}
}
}
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