extended type and subclasses
----------------------------
Key: CAY-540
URL: http://issues.apache.org/cayenne/browse/CAY-540
Project: Cayenne
Type: Improvement
Components: Cayenne Core Library
Versions: 1.2 [BETA]
Reporter: Tore Halset
Priority: Minor
Fix For: AFTER 1.2
Tore:
I am using an ExtendedType to map a JTS Geometry to a CLOB as done here:
http://objectstyle.org/confluence/display/CAY/Mapping+JTS+Geometries
This has been working ok, but I have only used it for reading. Trying to use
the same ExtendedType for writing got me into an annoying problem. On writing I
typically set a Polygon or MultiPolygon on the CayenneDataObject. P and MP are
both subclasses of the mapped Geometry, but are not mapped correctly as the map
only contains class names.
I have updated the example in the wiki to reflect this "problem".
Perhaps ExtendedType should map a Class (and handle subclasses) instead of a
String holding a class name? Just wanted to discuss it here before creating a
feature request for it.
Andrus:
Yeah, let's open a feature request for it. As for using Class instead of String
class name as map keys - this can cause troubles with nested ClassLoaders. I
guess instead we may reimplement 'ExtendedTypeMap.getRegisteredType(Class)' to
scan the class hierarchy up to, but not including, java.lang.Object before
falling back to a default type.
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