Modify the logical operator in an Expression

Question

Hi,
How to alter an Operator ("LIKE" to "EQUAL") inside an Expression already built - before execution ?
Let me explain my problem :
I have a central Toplink Adapter class which is responsible for executing all Expressions passed from different modules.
Each module is passing an Expression object to this Adapter.
There is a DeletionStatus column in almost all the tables whose value could be "Y" or "N".
Almost all Expressions append (through AND) this DeletionStatus column checking the value to "Y" or "N".
The problem here is the subordinates while building the Expression have used LIKE operator many places on this DeletionStatus column rather than EQUAL (or EQUALS).
My objective now is to regulate within the adapter class that EQUAL/s to be used to improve performance.
Sitting in the Adapter class...after accepting the Expression object as a parameter...how can i alter the Expression(/query) such that if the DeletionStatus column is part of the Expression built...then modify the Operator to be EQUAL/s only and not LIKE.
Seamlessly.....irrespective of the Operator used by the subordinates....the Adapter always executes with EQUALS operator thereby improving on the performance of SQL execution.
Please help.
Thank you very much in advance.
Regards,

Answer 1

I would think you would be best off change the code that is using like() and change it to equal() instead of leaving this code incorrect, and trying to mung it elsewhere.
If you really want to mung it, you could walk the Expression tree and look for LIKE and the field and switch the operator of the RelationExpression.
James : http://www.eclipselink.org