public void initProviders() throws DataBaseException {
    providers = dao.getProviders();
    selectProviderCb.getItems().clear();

    for (Provider provider : providers) {
      selectProviderCb.getItems().add(provider.getName());
    }
    selectProviderCb.setValue(providers.get(0).getName());
  }
  private void initializeAssignmentListViewAndFilters() {
    final ListBinding<PersonnelAssignment> filteredAssignementBinding =
        new ListBinding<PersonnelAssignment>() {
          final ObjectBinding<ObservableList<PersonnelAssignment>> internalBinding =
              Bindings.select(
                  assignmentsFilterComboBox.getSelectionModel().selectedItemProperty(),
                  "assignments");

          {
            bind(internalBinding);
          }

          @Override
          protected ObservableList<PersonnelAssignment> computeValue() {
            return internalBinding.get();
          }

          @Override
          public Spliterator<PersonnelAssignment> spliterator() {
            return super.spliterator();
          }
        };

    assigmentsListView.itemsProperty().bind(filteredAssignementBinding);
    assigmentsListView.setCellFactory(
        new PropertyListCellFactory<PersonnelAssignment>("name", null));

    assignmentsFilterComboBox.getItems().clear();
    assignmentsFilterComboBox.getItems().addAll(assignementFilters);
    assignmentsFilterComboBox.setCellFactory(
        new PropertyListCellFactory<AssignementFilter>("name", null));
    assignmentsFilterComboBox.setButtonCell(
        new ListCell<AssignementFilter>() {
          @Override
          protected void updateItem(AssignementFilter item, boolean empty) {
            super.updateItem(item, empty);
            if (textProperty().isBound()) {
              textProperty().unbind();
            }
            if (item != null || !empty) {
              textProperty().bind(item.nameProperty());
            }
          }
        });
  }
  public void initGrains() {
    grains = new ArrayList<>();
    grains.add(new Wheat());
    grains.add(new Rice());
    for (Grain grain : grains) {
      selectGrainCb.getItems().add(grain.getDescription());
    }

    selectGrainCb
        .valueProperty()
        .addListener(
            new ChangeListener<String>() {
              @Override
              public void changed(ObservableValue ov, String t, String t1) {
                grain = getGrain(t1);
                initProperties(grain);
              }
            });

    selectGrainCb.setValue(grains.get(0).getDescription());
  }
  private void initializeSkillFilterTab() {
    skillFilterComboBox.getItems().addAll(skills);
    PropertyListCellFactory<Skill> propertyListCellFactory =
        new PropertyListCellFactory<>("name", null);
    skillFilterComboBox.setButtonCell(
        new ListCell<Skill>() {
          @Override
          protected void updateItem(Skill arg0, boolean arg1) {
            super.updateItem(arg0, arg1);
            if (arg1 || arg0 == null) {
              this.setText(null);
            } else {
              this.setText(arg0.getName());
            }
          }
        });
    skillFilterComboBox.setCellFactory(propertyListCellFactory);
    skillFiltersNameColumn.setCellValueFactory(
        new Callback<CellDataFeatures<SkillFilter, String>, ObservableValue<String>>() {
          @Override
          public ObservableValue<String> call(CellDataFeatures<SkillFilter, String> arg0) {
            return Bindings.selectString(arg0.getValue().skillProperty(), "name");
          }
        });

    skillFilterMinValueColumn.setCellValueFactory(
        new PropertyValueFactory<SkillFilter, Integer>("minValue"));
    skillFilterMaxValueColumn.setCellValueFactory(
        new PropertyValueFactory<SkillFilter, Integer>("maxValue"));
    skillFiltersTableView
        .getItems()
        .addListener(
            new ListChangeListener<SkillFilter>() {
              @Override
              public void onChanged(Change<? extends SkillFilter> arg0) {
                while (arg0.next()) {
                  for (SkillFilter skillFilter : arg0.getAddedSubList()) {
                    final Skill skill = skillFilter.getSkill();
                    TableColumn<Official, Number> skillColumn = new TableColumn<>(skill.getName());
                    skillColumn.setCellValueFactory(
                        new Callback<
                            CellDataFeatures<Official, Number>, ObservableValue<Number>>() {
                          @Override
                          public ObservableValue<Number> call(
                              CellDataFeatures<Official, Number> arg0) {
                            Official official = arg0.getValue();
                            IntegerBinding selectInteger =
                                Bindings.selectInteger(
                                    official.skillLevelsProperty().valueAt(skill), "level");
                            selectInteger.addListener(
                                new ChangeListener<Number>() {
                                  @Override
                                  public void changed(
                                      ObservableValue<? extends Number> arg0,
                                      Number arg1,
                                      Number arg2) {
                                    updateOfficialFiltersResult();
                                  }
                                });
                            return selectInteger;
                          }
                        });
                    officialsFilteredTableView.getColumns().add(skillColumn);
                    skillFiltersColumn.put(skill, skillColumn);
                  }

                  for (SkillFilter skillFilter : arg0.getRemoved()) {
                    final Skill skill = skillFilter.getSkill();
                    TableColumn<Official, Number> column = skillFiltersColumn.remove(skill);

                    if (column != null) {
                      officialsFilteredTableView.getColumns().remove(column);
                    }
                  }
                }
              }
            });
    Bindings.bindContent(skillFiltersMatcher.getMatchers(), skillFiltersTableView.getItems());
  }