protected override void UpdateDataObject(object dataContext, object table, object oldDataObject, object newDataObject)
{
var dataServiceContext = (DataServiceContext)dataContext;
var idataServiceContext = dataContext as IDataServiceContext;
string etag = null;
if (this._etagMap != null && this._etagMap.TryGetValue(DataServiceUtilities.BuildCompositeKey(oldDataObject), out etag))
{
if (idataServiceContext != null)
{
idataServiceContext.AttachTo(TableName, newDataObject, etag);
}
else
{
dataServiceContext.AttachTo(TableName, newDataObject, etag);
}
}
else
{
if (idataServiceContext != null)
{
idataServiceContext.AttachTo(TableName, newDataObject);
}
else
{
dataServiceContext.AttachTo(TableName, newDataObject);
}
}
ProcessForeignKeys(dataServiceContext, newDataObject, _values);
dataServiceContext.UpdateObject(newDataObject);
DataServiceResponse dataServiceResponse = dataServiceContext.SaveChanges();
}
protected override void DeleteDataObject(object dataContext, object table, object oldDataObject)
{
var dataServiceContext = (DataServiceContext)dataContext;
var idataServiceContext = dataContext as IDataServiceContext;
string etag = null;
if (this._etagMap != null && this._etagMap.TryGetValue(DataServiceUtilities.BuildCompositeKey(oldDataObject), out etag))
{
if (idataServiceContext != null)
{
idataServiceContext.AttachTo(TableName, oldDataObject, etag);
}
else
{
dataServiceContext.AttachTo(TableName, oldDataObject, etag);
}
}
else
{
if (idataServiceContext != null)
{
idataServiceContext.AttachTo(TableName, oldDataObject);
}
else
{
dataServiceContext.AttachTo(TableName, oldDataObject);
}
}
dataServiceContext.DeleteObject(oldDataObject);
dataServiceContext.SaveChanges();
}
// The logic that figures out the association is not yet ready. For now we use the second implementation, which
// gets us going until we iron things out
#if NOTYETREADY
internal void Initialize()
{
if (DataServiceUtilities.IsEntityType(this.ColumnType, this.Table.DataModel.ContextType))
{
TableProvider tp = this.Table.DataModel.Tables
.FirstOrDefault(t => t.EntityType.IsAssignableFrom(this.ColumnType));
if (tp != null)
{
DataServiceColumnProvider nullColumn = new DataServiceColumnProvider(tp)
{
ColumnType = typeof(string),
Name = "Null(" + this.Table.Name + "." + this.Name + ")"
};
((DataServiceTableProvider)tp).AddColumn(nullColumn);
Association = new DataServiceAssociationProvider(
AssociationDirection.ManyToOne,
this,
nullColumn,
new List <string>()
{
this.Table.Name + "({0})/" + this.Name
});
}
}
// not the best heuristic, but it'll do for now
else if (!DataServiceUtilities.IsPrimitiveType(this.ColumnType) &&
typeof(IEnumerable).IsAssignableFrom(this.ColumnType) &&
this.ColumnType.GetGenericArguments().Length > 0 &&
DataServiceUtilities.IsEntityType(this.ColumnType.GetGenericArguments()[0], this.Table.DataModel.ContextType))
{
TableProvider tp = this.Table.DataModel.Tables
.FirstOrDefault(t => t.EntityType.IsAssignableFrom(this.ColumnType));
if (tp != null)
{
DataServiceColumnProvider nullColumn = new DataServiceColumnProvider(this.Table)
{
ColumnType = typeof(string),
Name = "Null(" + this.Table.Name + "." + this.Name + ")"
};
((DataServiceTableProvider)tp).AddColumn(nullColumn);
Association = new DataServiceAssociationProvider(
AssociationDirection.ManyToMany,
this,
nullColumn,
new List <string>()
{
this.Table.Name + "({0})/" + this.Name
});
}
}
}
public static IEnumerable <PropertyInfo> EnumerateEntitySetProperties(Type contextType)
{
foreach (PropertyInfo prop in contextType.GetProperties())
{
if (typeof(IQueryable).IsAssignableFrom(prop.PropertyType) &&
prop.PropertyType.GetGenericArguments().Length > 0 &&
DataServiceUtilities.IsEntityType(prop.PropertyType.GetGenericArguments()[0], contextType))
{
yield return(prop);
}
}
}
protected override object SaveViewState()
{
var myState = new Pair();
myState.First = base.SaveViewState();
if (_dataServiceContext != null)
{
myState.Second = _dataServiceContext.Entities.Where(ed => !String.IsNullOrEmpty(ed.ETag)).ToDictionary(
ed => DataServiceUtilities.BuildCompositeKey(ed.Entity), ed => ed.ETag);
}
return(myState);
}
public DataServiceColumnProvider(TableProvider table, PropertyInfo prop, bool isKey)
: base(table)
{
_prop = prop;
EntityTypeProperty = prop;
Name = _prop.Name;
ColumnType = _prop.PropertyType;
IsPrimaryKey = isKey;
IsSortable = true;
IsGenerated = false; // We don't have a way of knowing this...could be an issue
IsForeignKeyComponent = false; // No FKs in Astoria
IsCustomProperty = false; // All properties are considered part of the contract in Astoria client
Nullable = DataServiceUtilities.IsNullableType(ColumnType);
}
public DataServiceDataModelProvider(Type contextType)
{
if (contextType == null)
{
throw new ArgumentNullException("contextType");
}
this.ContextType = contextType;
var tables = new Collection <TableProvider>();
foreach (PropertyInfo prop in DataServiceUtilities.EnumerateEntitySetProperties(contextType))
{
tables.Add(new DataServiceTableProvider(this, prop));
}
this._tables = new ReadOnlyCollection <TableProvider>(tables);
foreach (var table in tables)
{
((DataServiceTableProvider)table).Initialize();
}
}
private void ProcessForeignKeys(DataServiceContext dataServiceContext, object dataObject, IDictionary values)
{
foreach (string key in values.Keys)
{
// Check if it looks like a FK, e.g. Category.CategoryID
string[] parts = key.Split('.');
if (parts.Length != 2)
{
continue;
}
// Get the name of the entity ref property, e.g. Category
string entityRefPropertyName = parts[0];
// Create an 'empty' relaty entity, e.g a Category
PropertyInfo propInfo = dataObject.GetType().GetProperty(entityRefPropertyName);
object entityRefObject = Activator.CreateInstance(propInfo.PropertyType);
// Set the PK in the related entity, e.g. set the CategoryID in the Category
PropertyInfo subPropInfo = propInfo.PropertyType.GetProperty(parts[1]);
subPropInfo.SetValue(
entityRefObject,
Convert.ChangeType(values[key], subPropInfo.PropertyType),
null);
// Find the entity set property for the association
var entitySetProp = DataServiceUtilities.FindEntitySetProperty(
dataServiceContext.GetType(), propInfo.PropertyType);
// Attach the related entity and set it as the link on the main entity
if (entitySetProp != null)
{
dataServiceContext.AttachTo(entitySetProp.Name, entityRefObject);
dataServiceContext.SetLink(dataObject, entityRefPropertyName, entityRefObject);
}
}
}
private bool IsKeyColumn(PropertyInfo columnProp)
{
return(DataServiceUtilities.IsKeyColumn(columnProp));
}
