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https://issues.apache.org/jira/browse/MATH-1155?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14334011#comment-14334011
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Thomas Neidhart commented on MATH-1155:
---------------------------------------
The reason to make the nested class protected is to allow users to create their
own WELL class with different parameters for K, M1, M2 and M3. This was
possible with CM3 and if we make the nested class package private it is not
accessible anymore.
> Speedup initialization of WellXXX rngs
> --------------------------------------
>
> Key: MATH-1155
> URL: https://issues.apache.org/jira/browse/MATH-1155
> Project: Commons Math
> Issue Type: Improvement
> Affects Versions: 3.3
> Reporter: Thomas Neidhart
> Fix For: 4.0
>
> Attachments: MATH-1155.patch
>
>
> As identified in MATH-1154, initialization of the WellXXX rngs is quite
> costly as some internal arrays have to be computed.
> Most of these initializations are specific to the type of rng, e.g.
> Well19937a and will not change afterwards, thus could be initialized in a
> static way.
> Due to implementation details, i.e. the relevant fields are declared
> protected in the base class AbstractWell, such a change would not be
> backwards compatible and will have to be postponed to 4.0
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