[jira] [Created] (SIS-590) NilReason on a wider range of types

["Martin Desruisseaux (Jira)" <ji...@apache.org>]

Martin Desruisseaux created SIS-590:
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             Summary: NilReason on a wider range of types
                 Key: SIS-590
                 URL: https://issues.apache.org/jira/browse/SIS-590
             Project: Spatial Information Systems
          Issue Type: Improvement
          Components: Metadata
    Affects Versions: 1.4
            Reporter: Martin Desruisseaux


Apache SIs 1.3 supported {{NilReason}} on many (but not all) properties. A special treatment was done for {{Boolean}}, {{Integer}}, {{Float}} and {{Double}} types because they cannot be extended for implementing the {{NilObject}} interface.

Apache SIS 1.4 removed the special treatment because primitive wrappers will become value objects in a future Java version, which invalidate the technic used in Apache SIS 1.3 and before. This is because that technic was relying on object identities. The special treatment has been kept for {{Float}} and {{Double}} using the various NaN values allowed by IEEE 754.

Apache SIS 1.5 restored the special treatment for {{Boolean}} and {{Integer}} types but using a different technic, based on a new map view: {{NilReasonMap}}. This new approach is applicable to all types that cannot be represented as {{NilObject}}. However the information is lost at XML marshaling time, unless private getters and setters are added.

XML marshaling of "nil reason" has been updated for properties which were supported in Apache SIS 1.3. The following classes or properties has not yet been updated because they were not supported in SIS 1.3. However they could be opportunistically updated too:

* {{java.util.Date}}.
* All {{CodeList}} subclasses
* {{DefaultRepresentativeFraction.denominator}} — because a primitive long integer is used.
* {{DefaultGeorectified.checkPointAvailability}} — because a primitive boolean is used.
* {{DefaultGeoreferenceable.controlPointAvailability}} — idem.
* {{DefaultGeoreferenceable.orientationParameterAvailability}} — idem.
* {{DefaultGridSpatialRepresentation.transformationParameterAvailability}} — idem.




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