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Digilasku osa 3


Digilaskussa on jo nyt yli kaksikymmentä erilaista lomaketta. Syötekenttiä on noin 200. Yksi digilaskun onnistuneimpia osioita on näiden hallinta: syötekenttien validointi on pysynyt kohtuullisen hyvin kasassa.

Jokainen lomake on omassa luokassaan, joka perii Vaatimen Form-luokan. Laskujen, lähetteiden ja tarjousten formit perivät vielä tätä ennen abstraktin luokan, joka määrittelee näille yhteiset ominaisuudet. Lähes kaikki formit käyttävät suoraan Vaatimen datamallia, eli Java Beanit tai POJOT asetetaan suoraan formeihin. Datan tallennus onnistuu siis helposti ilman manuaalisia parsimisia, sillä formista tulee suoraan ulos ehjä objekti tietokantaan tallennettavaksi.

Formin syötekentissä käytetään useita erilaisia validaattoreita, jotka ovat myös omissa luokissaan. Syötekenttiä on yleistetty aina kun mahdollista, jotta vältytään perusvalidointien turhalta toistolta syötekentän luomisessa. Vaatimen vahvuuksia on ehdottomasti monipuolinen syötekenttien validointi.

Päädyimme toteuttamaan paljon applikaation logiikkaa tallennusnappuloihin. Suurimmaksi osin tämä toimii aika hyvin, vaikka paikoitellen rikomme räikeästi olio-ohjelmoinnin perussääntöjä, mutta toisaalta, nyt bugien lähteet on suhteellisen helppo selvittää. Elegantimpi tapa olisi tehdä itse lomakkeista funktionaalisempia, jolloin data ja sitä käsittelevät metodit olisivat samassa paikassa.
private Button getSaveButton() {
  Button save = new Button("Tallenna");
  save.addListener(new Button.ClickListener() {

   public void buttonClick(ClickEvent event) {
    PersistenceManager pm = PMF.get().getPersistenceManager();
    try {
     adminForm.commit();
     userForm.commit();
     user.setAccountId(ac.getAccountid());
     user.setUserType(DigilaskuApplication.USERTYPE_ADMIN);
     pm.makePersistent(ac);
     pm.makePersistent(user);
     NotificationFactory.showSaveMessage();
    } catch (Exception e) {

    } finally {
     pm.close();
    }

   }
  });
  return save;
 }

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