Martin Desruisseaux created SIS-410:
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Summary: More stable MathTransform.Inverse serialization
Key: SIS-410
URL: https://issues.apache.org/jira/browse/SIS-410
Project: Spatial Information Systems
Issue Type: New Feature
Components: Referencing
Affects Versions: 0.8, 0.7, 0.6, 0.5
Reporter: Martin Desruisseaux
Assignee: Martin Desruisseaux
Fix For: 1.0
The {{AbstractMathTransform.Inverse}} class is non-static. This cause the
compiler to generate a {{this$0}} private field. But this synthetic fields may
not be the same across implementations of different Java compilers.
Consequently reading a class serialized with an Apache SIS library compiled
with a different compiler may not recognize the fields that are named
differently (see
http://developer.java.sun.com/developer/bugParade/bugs/4211550.html). We should
use static inner class with a named field (e.g. {{"forward"}})instead. This is
an incompatible change, but {{AbstractMathTransform.Inverse}} is protected
rather than public.
In the particular case of {{AbstractMathTransform.Inverse}}, it also avoid a
minor strangeness. Since we extends {{Inverse}} in different classes, we saw
the synthetic {{this$0}} field duplicated in each subclass. Using a named field
instead will avoid that.
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