Cool. looking forward to that. Quoting Werner Froidevaux <[EMAIL PROTECTED]>:
> Hi, > > OK. I will start with a simple implementation which > is working as external program using the setter/getter > of Cells. In a second step we can think about how > to integrate it into the existing poi framework. > > If we only implement the "Date and Time", "Logical", > "Lookup and Reference", "Math and Trigonometry" and > "Text and Data" functions these should be doable in > a finite amount of time. > > -werner. > > > -----Original Message----- > > From: Andrew C. Oliver [mailto:[EMAIL PROTECTED]] > > Sent: Dienstag, 28. Mai 2002 14:31 > > To: POI Developers List > > Subject: Re: recalc for sheets > > > > > > I humbly suggest that this is needed, but furthermore the > > following use > > case be considered. > > > > XML ------> HSSF -----------> XLS > > | > > | > > | > > XSL > > | > > | > > | > > XHTML > > > > In this case we are outputting to XLS for one edition of our > > spreadsheet > > and XHTML for another (or PDF, or whatever). XHTML does not support > > formulas, and lets say we want to output the result. I think our > > calculation engine should support this scenario as I think it > > will be a > > common one. > > > > Regardless, I totally think we need one. > > > > -Andy > > > > Avik Sengupta wrote: > > > > >>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 > > >VJ+ 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:poi-dev-> [EMAIL PROTECTED]> > > >>For > > additional commands, > > e-mail: > > >><mailto:[EMAIL PROTECTED]> > > >> > > >> > > >> > > >> > > > > > > > > > > > >-- > > >To unsubscribe, e-mail: > > <mailto:poi-dev-> [EMAIL PROTECTED]> > > >For > > additional commands, > > e-mail: > > ><mailto:[EMAIL PROTECTED]> > > > > > > > > > > > > > > > > > > > > > > -- > > 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]>
