> I'd like to use poi in the following scenario: That is certainly a very common requirement. In the past, we have either used VJ+ - COM integration (if you are on windows) or JIntegra Bridge successfully for such scenarios.
>But this does not seem very adequate in >server environments. Yeah, but if you want to use excel as your calculation engine, you take what you get :) As Andy mentioned, having hooks into excel from poi is certainly not a good idea. >But what would be really >helpful is a hook where a calculator could be installed If there is an open source java calculator available .. or somone is willing to write one .. , we could certainly look at integrating with it. I would certainly be willing to help in writing any such hooks. However, I dont think a generic interface to ANY calculator will work, without knowing what/how such a calculator does/works. Regards - Avik Quoting Werner Froidevaux <[EMAIL PROTECTED]>: > Avik, > > > files, and not a functional replacement for Excel/Word etc. > I'd like to use poi in the following scenario: > > - The user creates sheets with formulas, etc. he/she can > test them all within excel. > - tested sheets are then deployed into a running > (java) application. > - The application (e.g. EJB) is using the sheets as > calculator. When invoked it can set predefined fields in > the sheet, do a recalc() and return the results to > the calling client application. > > This way the user does not have to write java programs for > specifying calculations. > > An alternative scenario would be to call Excel through > OLE automation. But this does not seem very adequate in > server environments. > > > We depend on Excel > > automatically recalculating the sheet on open. > Not very useful in the scenario described above (or > users do manually a recalc on every EJB invocation). > > > I dont know if it should be any other way. do we want to have > > an implementation > > of MMULT for example in poi? > Not really ;-) See your point. But what would be really > helpful is a hook where a calculator could be installed > (for example a setCalculator() on the workbook). A > recalc() method on the workbook could walk the cells > (don't know excactly the strategy of excel), manage > a calculation stack, call the calculator and assign the > calculated values to the cells. > > -werner. > > > -----Original Message----- > > From: Avik Sengupta [mailto:[EMAIL PROTECTED]] > > Sent: Montag, 27. Mai 2002 13:33 > > To: POI Developers List; [EMAIL PROTECTED] > > Subject: Re: recalc for sheets > > > > > > Werner, > > > > Thanks for your patches. > > > > Abt recalc .. actually, poi does not have any "calc" > > functionality as yet. The > > idea (at least mine :) is that poi is an api for reading and > > writing Excel/OLE2 > > files, and not a functional replacement for Excel/Word etc. > > > > As per this philosophy, poi at the moment just writes the > > formulas in a string > > as per the excel format, but does not actually calculate the > > result value of > > the formula. the cell value record is set to 0 (of course, > > we need to change > > that for string formulas .. but thats another story). We > > depend on Excel > > automatically recalculating the sheet on open. (This happens > > on office 2000+, > > there is a record we can set to ensure it happens on 97 as well. ) > > > > I dont know if it should be any other way. do we want to have > > an implementation > > of MMULT for example in poi? > > > > That having been said, if you have a better idea, please, fire away. > > > > Regards > > - > > Avik > > > > > > Quoting Werner Froidevaux <[EMAIL PROTECTED]>: > > > > > Is there a way to recalc() a sheet? I've found some > > > hints in the FormulaRecord class but I'm not sure > > > whether this is the right place to look at. > > > > > > If there is no recalc() function yet, where is the > > > right place to add it. > > > > > > -werner. > > > > > > > > > -- > > > To unsubscribe, e-mail: > > <mailto:poi-dev-> [EMAIL PROTECTED]> > > > For > > additional commands, > > e-mail: > > > <mailto:[EMAIL PROTECTED]> > > > > > > > > > > > > > -- > To unsubscribe, e-mail: <mailto:[EMAIL PROTECTED]> > For additional commands, e-mail: <mailto:[EMAIL PROTECTED]> > > -- To unsubscribe, e-mail: <mailto:[EMAIL PROTECTED]> For additional commands, e-mail: <mailto:[EMAIL PROTECTED]>
