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[eclipselink-dev] PESSIMISTIC_READ

I am working on pessimistic locking on MaxDB.
MaxDB has lock modes "EXCLUSIVE" and "OPTIMISTIC", which seem to match the JPA lock modes PESSIMISTIC_WRITE and PESSIMIMSTIC_READ respectively.
It appears to me that I need to overwrite DatabasePlatform.getSelectForUpdateString in order to leverage database-specific pessimistic locking. However, it is not clear to me how to achieve the distinction between the lock modes PESSIMISTIC_WRITE and PESSIMIMSTIC_READ.
Am I missing something?
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