src/controller/TeachingController.java - master - Maksim_Shchelochok/Course_Work

src/controller/TeachingController.java
154 строки6 KB
Maksim
Создан CRUD-контроллер для Teaching
23 июн 2026, 16:04
23 июн 2026, 16:048b614ed
package controller;

import javafx.geometry.Insets;
import javafx.scene.control.*;
import javafx.scene.layout.GridPane;
import javafx.scene.layout.Region;
import model.Group;
import model.Teacher;
import model.Teaching;
import model.TeachingManager;
import view.EntityTableView;

import java.util.List;
import java.util.Optional;

public class TeachingController {

    private final TeachingManager manager = new TeachingManager();
    private final EntityTableView view;

    public TeachingController(boolean canEdit) {
        this.view = new EntityTableView(
                new String[]{"ID", "Преподаватель", "Группа (ID)", "Часов"}, canEdit);

        view.getRefreshButton().setOnAction(e -> refresh());
        if (canEdit) {
            view.getAddButton().setOnAction(e -> add());
            view.getEditButton().setOnAction(e -> edit());
            view.getDeleteButton().setOnAction(e -> delete());
        }
        refresh();
    }

    public Region getView() { return view; }

    private void refresh() {
        view.setData(manager.getAll());
    }

    private void add() {
        showDialog("Добавить преподавание", -1, -1, 0, t -> {
            String error = manager.create(t.getTeacherId(), t.getGroupId(), t.getHoursCount());
            if (error != null) error(error);
            refresh();
        });
    }

    private void edit() {
        Object[] row = view.getSelectedRow();
        if (row == null) { info("Выберите строку для изменения."); return; }
        int id = Integer.parseInt(row[0].toString());

        int curTeacherId = -1, curGroupId = -1, curHours = 0;
        for (Teaching t : manager.getAll()) {
            if (t.getTeachingId() == id) {
                curTeacherId = t.getTeacherId();
                curGroupId = t.getGroupId();
                curHours = t.getHoursCount();
                break;
            }
        }

        showDialog("Изменить преподавание", curTeacherId, curGroupId, curHours, t -> {
            String error = manager.update(id, t.getTeacherId(), t.getGroupId(), t.getHoursCount());
            if (error != null) error(error);
            refresh();
        });
    }

    private void delete() {
        Object[] row = view.getSelectedRow();
        if (row == null) { info("Выберите строку для удаления."); return; }
        int id = Integer.parseInt(row[0].toString());
        String error = manager.delete(id);
        if (error != null) error(error);
        refresh();
    }

    private void showDialog(String title, int existingTeacherId, int existingGroupId,
                            int existingHours, java.util.function.Consumer<Teaching> onOk) {
        Dialog<Teaching> dialog = new Dialog<>();
        dialog.setTitle(title);
        dialog.getDialogPane().getButtonTypes().addAll(ButtonType.OK, ButtonType.CANCEL);

//      Список преподавателей
        ComboBox<Teacher> teacherBox = new ComboBox<>();
        List<Teacher> teachers = manager.getAllTeachers();
        teacherBox.getItems().addAll(teachers);
        teacherBox.setConverter(new javafx.util.StringConverter<Teacher>() {
            @Override public String toString(Teacher t) {
                return t == null ? "" : t.getLastName() + " " + t.getFirstName();
            }
            @Override public Teacher fromString(String s) { return null; }
        });
        if (existingTeacherId != -1) {
            for (Teacher t : teachers) {
                if (t.getId() == existingTeacherId) { teacherBox.setValue(t); break; }
            }
        }

//      Список групп
        ComboBox<Group> groupBox = new ComboBox<>();
        List<Group> groups = manager.getAllGroups();
        groupBox.getItems().addAll(groups);
        groupBox.setConverter(new javafx.util.StringConverter<Group>() {
            @Override public String toString(Group g) {
                return g == null ? "" : "Группа №" + g.getGroupId() + " (" + g.getSpecialityName() + ")";
            }
            @Override public Group fromString(String s) { return null; }
        });
        if (existingGroupId != -1) {
            for (Group g : groups) {
                if (g.getGroupId() == existingGroupId) { groupBox.setValue(g); break; }
            }
        }

        TextField hoursField = new TextField(String.valueOf(existingHours));

        GridPane grid = new GridPane();
        grid.setHgap(10); grid.setVgap(10); grid.setPadding(new Insets(20));
        grid.add(new Label("Преподаватель:"), 0, 0); grid.add(teacherBox, 1, 0);
        grid.add(new Label("Группа:"), 0, 1);         grid.add(groupBox, 1, 1);
        grid.add(new Label("Часов:"), 0, 2);          grid.add(hoursField, 1, 2);
        dialog.getDialogPane().setContent(grid);

        dialog.setResultConverter(button -> {
            if (button == ButtonType.OK) {
                Teacher t = teacherBox.getValue();
                Group g = groupBox.getValue();
                if (t == null || g == null) return null;
                int hours;
                try { hours = Integer.parseInt(hoursField.getText().trim()); }
                catch (Exception ex) { hours = 0; }
                return new Teaching(0, t.getId(),
                        t.getLastName() + " " + t.getFirstName(), g.getGroupId(), hours);
            }
            return null;
        });

        Optional<Teaching> result = dialog.showAndWait();
        if (result.isPresent()) {
            onOk.accept(result.get());
        }
    }

    private void info(String text) {alert(Alert.AlertType.INFORMATION, text);}
    private void error(String text) {alert(Alert.AlertType.ERROR, text);}
    private void alert(Alert.AlertType type, String text) {
        Alert a = new Alert(type);
        a.setHeaderText(null);
        a.setContentText(text);
        a.showAndWait();
    }
}