[JENA-1613] When registering an incompatible Datatype a warning should be logged

• Type: Improvement
• Status: Open
• Priority: Minor
• Resolution: Unresolved
• Affects Version/s: Jena 3.8.0
• Component/s: Core
• Assignee: Claude Warren
• Reporter: Claude Warren
• Created: 07/Oct/18 14:25
• Updated: 07/Oct/18 14:42

Description

Classes that extend AdhocDatatype (or Basedatatype) and want to allow multiple instances of the datatype class to be considered equal must do the following:

1. Override BaseDatatype.isEqual(LiteralLabel litLabel1, LiteralLabel litLabel2) to call isEqualByTerm(LiteralLabel litLabel1, LiteralLabel litLabel2).
2. Override Object.equals(Object obj)
3. Override Object.hashCode(), potentially calling BaseDatatype.getHashCode( LiteralLabel lit )

There should be a warning in the log if TypeMapper.register(RDFDatatype type ) is called and there is an existing datatype registered for the type.getJavaClass()