public static Type CreateView(BelongsToAttribute bta) => Cache.GetOrAdd(bta /*jo kulcsnak*/, () =>
{
Type dataTable = bta.OrmType;
PropertyInfo
pk = dataTable.GetPrimaryKey(),
column = bta.OrmType.GetProperty(bta.Column) ?? throw new MissingMemberException(bta.OrmType.Name, bta.Column);
//
// [View(Base = typeof(Table)), MapFrom(nameof(Column))]
// class Table_Column_View
// {
// [BelongsTo(typeof(Table))]
// public int Id {get; set;}
// [BelongsTo(typeof(Table))]
// public ValueType Column {get; set;}
// }
//
return(CreateView
(
new MemberDefinition
(
//
// A hash kod kell a tipus nevebe mivel ugyanazon oszlophoz tartozo erteklista szerepelhet tobb nezetben is
// kulonbozo "required" ertekkel.
//
$"{dataTable.Name}_{column.Name}_View_{bta.GetHashCode()}", // TODO: FIXME: bta.GetHashCode() gyanusan sokszor ad vissza 0-t
dataTable,
CustomAttributeBuilderFactory.CreateFrom <MapFromAttribute>(new[] { typeof(string) }, new object[] { column.Name })
),
new[]
{
//
// [BelongsTo(typeof(Table))]
// public int Id {get; set;}
//
new MemberDefinition
(
pk.Name,
pk.PropertyType,
CustomAttributeBuilderFactory.CreateFrom(new BelongsToAttribute(dataTable, bta.Required))
),
//
// [BelongsTo(typeof(Table), column: "Column")]
// public ValueType Column {get; set;}
//
new MemberDefinition
(
column.Name,
column.PropertyType,
CustomAttributeBuilderFactory.CreateFrom(new BelongsToAttribute(dataTable, bta.Required))
)
}
));
}, nameof(UnwrappedValueTypeView));
private static IEnumerable <MemberDefinition> GetKeyMembers()
{
IReadOnlyList <ColumnSelection> effectiveColumns = typeof(TUnwrappedView).GetColumnSelections();
//
// Vesszuk az eredeti nezet NEM lista tulajdonsagait
//
foreach (ColumnSelection column in typeof(TView).GetColumnSelections())
{
//
// Ha kicsomagolas soran a tulajdonsag at lett nevezve, akkor azt hasznaljuk.
//
ColumnSelection effectiveColumn = effectiveColumns.SingleOrDefault(ec => ec.ViewProperty.IsRedirectedTo(column.ViewProperty))
?? effectiveColumns.Single(ec => ec.ViewProperty.CanBeMappedIn(column.ViewProperty));
yield return(new MemberDefinition
(
effectiveColumn.ViewProperty.Name,
effectiveColumn.ViewProperty.PropertyType,
effectiveColumn.ViewProperty
.GetCustomAttributes()
.OfType <IBuildableAttribute>()
.Select(attr => CustomAttributeBuilderFactory.CreateFrom(attr))
.ToArray()
));
}
}
internal protected static Type CreateView(MemberDefinition viewDefinition, IEnumerable <MemberDefinition> columns)
{
ClassFactory core = new
(
viewDefinition.Name,
viewDefinition
.CustomAttributes
//
// Hogy a GetQueryBase() mukodjon a generalt nezetre is, ezert az uj osztalyt megjeloljuk nezetnek.
//
.Append(CustomAttributeBuilderFactory.CreateFrom <ViewAttribute>(new[] { typeof(Type) }, new object?[] { viewDefinition.Type }))
.ToArray()
);
//
// Uj property-k definialasa.
//
foreach (MemberDefinition column in columns)
{
core.AddProperty(column.Name, column.Type, column.CustomAttributes.ToArray());
}
Type result = core.CreateType();
#if DEBUG
StringBuilder sb = new();
sb.AppendLine("View created:");
foreach (Attribute attr in result.GetCustomAttributes())
{
sb.AppendLine($"[{attr}]");
}
sb
.AppendLine(result.Name)
.AppendLine("{");
foreach (PropertyInfo prop in result.GetProperties())
{
foreach (Attribute attr in prop.GetCustomAttributes())
{
sb.AppendLine($" [{attr}]");
}
sb.AppendLine($" {prop}");
}
sb.AppendLine("}");
Debug.WriteLine(sb);
#endif
return(result);
}
private static IEnumerable <CustomAttributeBuilder> GetClassAttributes()
{
Type
view = typeof(TView),
unwrapped = typeof(TUnwrappedView);
//
// Ha az eredeti nezet rendelkezik MapFrom attributummal akkor azt masolni kell, viszont elofordulhat h
// az oszlop a kicsomagolas soran at lett nevezve ezert kicsit trukkos
//
MapFromAttribute?mapFrom = view.GetCustomAttribute <MapFromAttribute>();
if (mapFrom is not null)
{
PropertyInfo mapFromProp = view.GetProperty(mapFrom.Property) ?? throw new MissingMemberException(view.Name, mapFrom.Property);
mapFromProp = unwrapped
.GetProperties()
.Single(prop => prop.CanBeMappedIn(mapFromProp));
yield return(CustomAttributeBuilderFactory.CreateFrom <MapFromAttribute>(new[] { typeof(string) }, new object?[] { mapFromProp.Name }));
}
}
private static IEnumerable <MemberDefinition> GetMembers()
{
foreach (IGrouping <string, ColumnSelection> grp in typeof(TView).GetColumnSelectionsDeep().GroupBy(sel => sel.ViewProperty.Name))
{
if (grp.Count() == 1)
{
//
// Ha a property csak egyszer szerepel a kicsomagolt nezetben akkor nem kell modositani a nevet
//
ColumnSelection sel = grp.Single();
yield return(new MemberDefinition
(
grp.Key,
sel.ViewProperty.PropertyType,
CustomAttributeBuilderFactory.CreateFrom(sel.Reason)
));
}
else
{
//
// Kulonben egyedive kell tenni a tulajdonsag nevet, valamint jelezni kell (MapToAttribute) h mely nezet-tulajdonsaghoz tartozik
//
int i = 0;
foreach (ColumnSelection sel in grp)
{
//
// [BelongsTo(typeof(TTable), column: "Column", ...), MapTo("TView.Column")]
// public TValue Column_i {get; set;}
//
yield return(new MemberDefinition
(
$"{grp.Key}_{i++}",
sel.ViewProperty.PropertyType,
CustomAttributeBuilderFactory.CreateFrom
(
sel.Reason,
//
// A "Column" tulajdonsagot meg ha az eredeti nezet nem is tartalmazta most be kell allitsuk
// (mivel a tulajdonsag uj nevet kapott)
//
new KeyValuePair <PropertyInfo, object>
(
typeof(ColumnSelectionAttribute).GetProperty(nameof(ColumnSelectionAttribute.Column)),
grp.Key
)
),
//
// Mappolaskor az eredeti tulajdonsagba kerul vissza a tartalom
//
CustomAttributeBuilderFactory.CreateFrom <MapToAttribute>(new[] { typeof(string) }, new object[] { sel.ViewProperty.FullName() })
));
}
}
}
}