private static bool MatchColumnAttribute(PropertyInfo property, ColumnDescription column)
{
#if EFOLD
return(false);
#else
var columnAttribute = property.GetCustomAttributes(typeof(ColumnAttribute), true).FirstOrDefault();
if (columnAttribute == null)
{
return(false);
}
return(((ColumnAttribute)columnAttribute).Name == column.Name);
#endif
}
private Expression ToExpression(ParameterExpression parameter, PropertyInfo property, ColumnDescription column)
{
if (property == null)
{
if (column.Name == table.DiscriminatorColumn)
{
return(Expression.Call(Expression.Constant(table), typeof(ObjectDataTable <T>).GetMethod(nameof(GetDiscriminator), BindingFlags.Instance | BindingFlags.NonPublic), parameter));
}
var binder = Binder.GetMember(CSharpBinderFlags.None, column.Name, typeof(ObjectData),
new[] { CSharpArgumentInfo.Create(CSharpArgumentInfoFlags.None, null) });
var expression = Expression.Dynamic(binder, typeof(object), parameter);
return(Expression.TryCatch(expression, Expression.Catch(typeof(RuntimeBinderException), Expression.Constant(null))));
}
return(Expression.Property(parameter, property));
}
/// <summary>
/// Loads the table data from the specified table data loader and materializes it
/// bases on the specified metadata.
/// </summary>
/// <param name="loaderFactory"> The loader factory. </param>
/// <param name="table"> The table metadata. </param>
/// <returns> The materialized data. </returns>
public static IEnumerable<object> Load(
ITableDataLoaderFactory loaderFactory,
DbTableInfo table)
{
List<ColumnDescription> columns = new List<ColumnDescription>();
PropertyInfo[] properties = table.EntityType.GetProperties();
Func<object, object>[] converters = new Func<object,object>[properties.Length];
for (int i = 0; i < properties.Length; i++)
{
PropertyInfo property = properties[i];
Type type = property.PropertyType;
// TODO: external
if (type == typeof(NMemory.Data.Timestamp))
{
converters[i] = ConvertTimestamp;
type = typeof(byte[]);
}
else if (type == typeof(NMemory.Data.Binary))
{
converters[i] = ConvertBinary;
type = typeof(byte[]);
}
ColumnDescription column = new ColumnDescription(property.Name, type);
columns.Add(column);
}
TableDescription tableDescription =
new TableDescription(table.TableName, columns);
ITableDataLoader loader = loaderFactory.CreateTableDataLoader(tableDescription);
// Prefetch require info/object to increase performance
Func<object[], object> initializer = table.EntityInitializer;
int columnCount = columns.Count;
// Single array to spare GC
object[] entityProperties = null;
foreach (object[] data in loader.GetData())
{
if (entityProperties == null)
{
// Initialize at the first element
entityProperties = new object[data.Length];
}
for (int i = 0; i < columnCount; i++)
{
object propertyValue = data[i];
// Use converter if required
Func<object, object> converter = converters[i];
if (converter != null)
{
propertyValue = converter.Invoke(propertyValue);
}
entityProperties[i] = propertyValue;
}
yield return initializer.Invoke(entityProperties);
}
}
private static PropertyInfo GetProperty(Type parentType, ColumnDescription column)
{
return(parentType.GetProperty(column.Name, PropertyFlags)
?? parentType.GetProperties(PropertyFlags)
.SingleOrDefault(p => MatchColumnAttribute(p, column)));
}
/// <summary>
/// Loads the table data from the specified table data loader and materializes it
/// bases on the specified metadata.
/// </summary>
/// <param name="loaderFactory"> The loader factory. </param>
/// <param name="table"> The table metadata. </param>
/// <returns> The materialized data. </returns>
public static IEnumerable <object> Load(
ITableDataLoaderFactory loaderFactory,
DbTableInfo table)
{
List <ColumnDescription> columns = new List <ColumnDescription>();
PropertyInfo[] properties = table.EntityType.GetProperties();
Func <object, object>[] converters = new Func <object, object> [properties.Length];
for (int i = 0; i < properties.Length; i++)
{
PropertyInfo property = properties[i];
Type type = property.PropertyType;
// TODO: external
if (type == typeof(NMemory.Data.Timestamp))
{
converters[i] = ConvertTimestamp;
type = typeof(byte[]);
}
else if (type == typeof(NMemory.Data.Binary))
{
converters[i] = ConvertBinary;
type = typeof(byte[]);
}
ColumnDescription column = new ColumnDescription(property.Name, type);
columns.Add(column);
}
TableDescription tableDescription =
new TableDescription(table.TableName, columns);
ITableDataLoader loader = loaderFactory.CreateTableDataLoader(tableDescription);
// Prefetch require info/object to increase performance
Func <object[], object> initializer = table.EntityInitializer;
int columnCount = columns.Count;
// Single array to spare GC
object[] entityProperties = null;
foreach (object[] data in loader.GetData())
{
if (entityProperties == null)
{
// Initialize at the first element
entityProperties = new object[data.Length];
}
for (int i = 0; i < columnCount; i++)
{
object propertyValue = data[i];
// Use converter if required
Func <object, object> converter = converters[i];
if (converter != null)
{
propertyValue = converter.Invoke(propertyValue);
}
entityProperties[i] = propertyValue;
}
yield return(initializer.Invoke(entityProperties));
}
}
