TODO.md

JOPA TODOs

High Priority

• Add support for query result set mapping
• Inheritance support
  • Mapped superclass
  • Single inheritance
  • Multiple inheritance
• Benchmark comparison with Empire and AliBaba
• Add support for IC validation disabling on entity load
  • Some sort of loading modes should be added (similar to Lock modes in JPA)
• JOPA Specification doc, which would explain behaviour and principles
  • Perhaps use the github wiki? Or something on KBSS Liferay?
• When persisting a collection of instances without generated ids, how to handle references between them?
  • It can happen that JOPA will try to insert a referenced individual which has not yet set id, which results in assigning it a generated URI. E.g. foreach(inst -> {inst.generateUri(); em.persist(inst); })
• Add support for EntityManager.getReference
• Add a @Context annotation, which would specify that a field/entity should always be loaded from the specified context.
  • This could be overwritten with a descriptor passed to EM
• Add support for orphanRemoval attribute in object properties
• Modify OntoDriver API to support Fetch joins
• Allow static (annotation, attribute of @OWLDataProperty) specification of language of String attributes. This can be overridden on EM operation level (in descriptor).

Low Priority

• How to enhance query results with transactional changes? Sesame
  • First check how SQL queries in JPA behave
• Add possibility to generate integrity constraints from the object model
• When OWL2Java generates classes and they already exist, rewrite only the fields and getters and setters, keep any other code intact
  • CodeModel API does not support any such feature, it always removes files and replaces them with new ones
• Add support for Lobs and Blobs

Research Topics

• Data integrity violation checks. E.g. when an entity is removed, there should be a check whether it is referenced from another entity
• Define schema for persistence.xml for JOPA
• Research whether we could replace aspectj with cglib-generated proxies

Currently in Progress