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using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Data.Metadata.Edm;
using System.Data.Objects;
using System.Linq;
using System.Reflection;
namespace System.Web.DynamicData.ModelProviders {
internal sealed class EFTableProvider : TableProvider {
private ReadOnlyCollection<ColumnProvider> _roColumns;
public EFTableProvider(EFDataModelProvider dataModel, EntitySet entitySet, EntityType entityType,
Type entityClrType, Type parentEntityClrType, Type rootEntityClrType, string name)
: base(dataModel) {
EntityType = entityClrType;
Name = name;
DataContextPropertyName = entitySet.Name;
ParentEntityType = parentEntityClrType;
RootEntityType = rootEntityClrType;
var genericMethod = DataModel.ContextType.GetMethod("CreateQuery");
CreateQueryMethod = genericMethod.MakeGenericMethod(EntityType);
CreateQueryString = CreateEntitySqlQueryString(entitySet);
var keyMembers = entityType.KeyMembers;
// columns (entity properties)
// note 1: keys are also available through es.ElementType.KeyMembers
// note 2: this includes "nav properties", kind of fancy, two-way relationship objects
var columns = new List<ColumnProvider>();
foreach (EdmMember m in entityType.Members) {
if (EFColumnProvider.IsSupportedEdmMemberType(m) && IsPublicProperty(entityClrType, m.Name)) {
EFColumnProvider entityMember = new EFColumnProvider(entityType, this, m, keyMembers.Contains(m));
columns.Add(entityMember);
}
}
_roColumns = new ReadOnlyCollection<ColumnProvider>(columns);
}
private static bool IsPublicProperty(Type entityClrType, string propertyName) {
var property = entityClrType.GetProperty(propertyName);
return property != null && property.GetGetMethod() != null;
}
private MethodInfo CreateQueryMethod { get; set; }
private string CreateQueryString { get; set; }
private static string CreateEntitySqlQueryString(EntitySet entitySet) {
// Qualify the entity set name with the container name (in case the ObjectContext's default
// container name is not set or has an unexpected value)
return QuoteEntitySqlIdentifier(entitySet.EntityContainer.Name) + "." + QuoteEntitySqlIdentifier(entitySet.Name);
}
private static string QuoteEntitySqlIdentifier(string identifier) {
// Enclose in square brackets and escape the one reserved character (])
return "[" + identifier.Replace("]", "]]") + "]";
}
public override ReadOnlyCollection<ColumnProvider> Columns {
get {
return _roColumns;
}
}
public override IQueryable GetQuery(object context) {
return (IQueryable)CreateQueryMethod.Invoke(context,
new object[] { CreateQueryString, new ObjectParameter[0] });
}
}
}
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