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using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Data.Linq.Mapping;
using System.Linq;
using System.Linq.Expressions;
using System.Reflection;
namespace System.Web.DynamicData.ModelProviders {
internal sealed class DLinqTableProvider : TableProvider {
private ReadOnlyCollection<ColumnProvider> _roColumns;
private List<ColumnProvider> _columns;
private MetaType _rowType;
private PropertyInfo _prop;
public DLinqTableProvider(DLinqDataModelProvider dataModel, MetaType rowType, string name, PropertyInfo prop)
: base(dataModel) {
_prop = prop;
_rowType = rowType;
Name = name;
DataContextPropertyName = prop.Name;
EntityType = rowType.Type;
ParentEntityType = rowType.InheritanceBase != null ? rowType.InheritanceBase.Type : null;
RootEntityType = rowType.Table.RowType.Type;
_columns = new List<ColumnProvider>();
var members = new List<MetaDataMember>(rowType.DataMembers);
// Add in base-class-first order (not the typical derived-class-first order)
foreach (PropertyInfo propInfo in GetOrderedProperties(rowType.Type)) {
MetaDataMember member = members.FirstOrDefault(m => m.Member.Name == propInfo.Name);
if (member != null) {
AddColumn(dataModel, member, propInfo);
members.Remove(member);
}
}
// Anything we might've missed, tack it onto the end
foreach (MetaDataMember member in members) {
AddColumn(dataModel, member, (PropertyInfo)member.Member);
}
_roColumns = new ReadOnlyCollection<ColumnProvider>(_columns);
}
private void AddColumn(DLinqDataModelProvider dataModel, MetaDataMember member, PropertyInfo propInfo) {
var publicGetAccessor = propInfo.GetGetMethod();
if (publicGetAccessor == null) {
// the property at least needs to have a public getter, otherwise databinding will not work
return;
}
DLinqColumnProvider column = new DLinqColumnProvider(this, member);
_columns.Add(column);
if (!dataModel.ColumnLookup.ContainsKey(propInfo))
dataModel.ColumnLookup[propInfo] = column;
}
private IEnumerable<PropertyInfo> GetOrderedProperties(Type type) {
if (type == null)
return new PropertyInfo[0];
PropertyInfo[] props = type.GetProperties(BindingFlags.DeclaredOnly | BindingFlags.Public | BindingFlags.Instance);
return GetOrderedProperties(type.BaseType).Concat(props);
}
internal void Initialize() {
_columns.ForEach(c => ((DLinqColumnProvider)c).Initialize());
_columns.RemoveAll(c => ((DLinqColumnProvider)c).ShouldRemove);
}
#region IEntity Members
public override IQueryable GetQuery(object context) {
return (IQueryable)_prop.GetValue(context, null);
}
public override ReadOnlyCollection<ColumnProvider> Columns {
get {
return _roColumns;
}
}
#endregion
}
}
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