pom.xml

@@ -110,6 +110,11 @@
             <artifactId>spring-boot-starter-test</artifactId>
             <scope>test</scope>
         </dependency>
+        <dependency>
+            <groupId>commons-beanutils</groupId>
+            <artifactId>commons-beanutils</artifactId>
+            <version>1.9.4</version>
+        </dependency>
         <dependency>
             <groupId>org.mockito</groupId>
             <artifactId>mockito-core</artifactId>

src/main/java/com/primefactorsolutions/model/Employee.java

@@ -48,4 +48,12 @@ public class Employee extends BaseEntity {
             WIDOWED,
             DIVORCED
         }
+    
+        public Status getStatus() {
+            return status;
+        }
+    
+        public void setStatus(Status status) {
+            this.status = status;
+        }
     }

src/main/java/com/primefactorsolutions/service/EmployeeService.java

@@ -1,49 +1,65 @@
 package com.primefactorsolutions.service;
 
 import com.primefactorsolutions.model.Employee;
+import org.apache.commons.beanutils.BeanComparator;
 import com.primefactorsolutions.repositories.EmployeeRepository;
-import org.springframework.data.domain.Page;
-import org.springframework.data.domain.PageRequest;
-import org.springframework.data.domain.Pageable;
 import lombok.Data;
-import org.springframework.data.domain.Sort;
 import org.springframework.stereotype.Service;
 
 import java.util.List;
 import java.util.UUID;
 import java.util.Optional;
+import java.util.Collections;
 
 
 @Service
 @Data
 public class EmployeeService {
     private final EmployeeRepository employeeRepository;
+    private List<Employee> pagedBase;
 
     public EmployeeService(EmployeeRepository employeeRepository) {
         this.employeeRepository = employeeRepository;
     }
 
+    private void initializePagedBase() {
+        if (pagedBase == null) {
+            this.pagedBase = employeeRepository.findAll();
+        }
+    }
+
+    public List<Employee> findEmployees(int start, int pageSize, String sortProperty, boolean asc) {
+        initializePagedBase(); // Asegurarse de que pagedBase esté inicializada
+        System.err.println("findAll " + start + " " + pageSize + " sort " + sortProperty + " asc:" + asc );
+        int end = (int) (start + pageSize);
+        if (end > pagedBase.size()) {
+            end = pagedBase.size();
+        }
+        Collections.sort(pagedBase, new BeanComparator<Employee>(sortProperty));
+
+        if(!asc) {
+            Collections.reverse(pagedBase);
+        }
+        return pagedBase.subList((int) start, end);
+    }
+
+    public List<Employee> findEmployees(int start, int pageSize) {
+        initializePagedBase(); // Asegurarse de que pagedBase esté inicializada
+        System.err.println("findAll " + start + " " + pageSize);
+        int end = (int) (start + pageSize);
+        if (end > pagedBase.size()) {
+            end = pagedBase.size();
+        }
+        return pagedBase.subList((int) start, end);
+    }
+
     public Employee createOrUpdate(final Employee employee) {
         final Employee saved = employeeRepository.save(employee);
         return saved;
     }
 
-    public List<Employee> getEmployees() {
-        return employeeRepository.findAll();
-    }
-
     public Employee getEmployee(final UUID id) {
         Optional<Employee> employee = employeeRepository.findById(id);
         return employee.orElse(null);
     }
-
-    public Page<Employee> getEmployeesPaginated(int pageNo, int pageSize, String sortField, boolean ascending) {
-        Sort sort = ascending ? Sort.by(sortField).ascending() : Sort.by(sortField).descending();
-        Pageable pageable = PageRequest.of(pageNo - 1, pageSize, sort);
-        return employeeRepository.findAll(pageable);
-    }
-
-    public boolean hasNextPage(int currentPage, int pageSize, String sortField, boolean ascending) {
-        return getEmployeesPaginated(currentPage, pageSize, sortField, ascending).hasNext();
-    }
 }

src/main/java/com/primefactorsolutions/views/EmployeesListView.java

@@ -3,18 +3,20 @@ package com.primefactorsolutions.views;
 import com.primefactorsolutions.model.Employee;
 import com.primefactorsolutions.service.EmployeeService;
 import com.vaadin.flow.component.button.Button;
-import com.vaadin.flow.component.combobox.ComboBox;
+import com.vaadin.flow.component.checkbox.Checkbox;
 import com.vaadin.flow.component.html.H2;
 import com.vaadin.flow.component.html.Main;
-import com.vaadin.flow.component.orderedlayout.HorizontalLayout;
-import com.vaadin.flow.component.notification.Notification;
 import com.vaadin.flow.router.PageTitle;
 import com.vaadin.flow.router.Route;
 import com.vaadin.flow.spring.annotation.SpringComponent;
+import org.vaadin.firitin.components.grid.PagingGrid;
+import com.vaadin.flow.component.grid.GridSortOrder;
+import com.vaadin.flow.data.provider.SortDirection;
 import jakarta.annotation.security.PermitAll;
 import org.springframework.context.annotation.Scope;
-import org.vaadin.firitin.components.grid.VGrid;
-import org.springframework.data.domain.Page;
+
+import java.util.List;
+
 
 @SpringComponent
 @Scope("prototype")
@@ -24,111 +26,99 @@ import org.springframework.data.domain.Page;
 public class EmployeesListView extends Main {
 
     private final EmployeeService employeeService;
-    private final int pageSize = 5;
-    private int currentPage = 1;
-    private String sortField = "firstName";
-    private boolean ascending = true;
-    private VGrid<Employee> grid;
-    private Button previous;
-    private Button next;
+    private final PagingGrid<Employee> table = new PagingGrid<>(Employee.class);
 
     public EmployeesListView(EmployeeService employeeService) {
         this.employeeService = employeeService;
-        addComponents();
-        updateGrid();
+        setupView();
+        refreshGrid();
     }
 
-    private void addComponents() {
-        addTitle();
-        addOrderButtons();
-        configureGrid();
-        addNavigationButtons();
+    private void setupView() {
+        add(new H2("Employee List"));
+        configureTable();
+        add(createAddEmployeeButton());
+        add(table);
     }
 
-    private void addTitle() {
-        final H2 title = new H2("Employees list");
-        add(title);
+    private void configureTable() {
+        table.setColumns("firstName", "lastName", "status");
+        addStatusColumn();
+        addEditButtonColumn("Edit", this::navigateToEditView);
+        addEditButtonColumn("Save", this::navigateToSaveChangeStatus);
+        setupPagingGrid();
     }
 
-    private void addOrderButtons() {
-        final HorizontalLayout hl = new HorizontalLayout();
-        hl.add(createOrderButton("Employee List in Ascending Order", true));
-        hl.add(createOrderButton("Employee List in Descending Order", false));
-        add(hl);
+    private void addStatusColumn() {
+        table.addComponentColumn(this::createStatusCheckbox)
+                .setHeader("Change Status");
     }
 
-    private Button createOrderButton(String label, boolean isAscending) {
+    private Checkbox createStatusCheckbox(Employee employee) {
+        Checkbox statusCheckbox = new Checkbox( employee.getStatus() == Employee.Status.ACTIVE);
+        return statusCheckbox;
+    }
+
+    private void updateEmployeeStatus(Employee employee, boolean isActive) {
+        employee.setStatus(isActive ? Employee.Status.ACTIVE : Employee.Status.INACTIVE);
+        employeeService.createOrUpdate(employee);
+        refreshGrid();
+    }
+
+    private void addEditButtonColumn(String label, ButtonClickHandler handler) {
+        table.addComponentColumn(employee -> createButton(label, () -> handler.handle(employee)));
+    }
+
+    private Button createButton(String label, Runnable onClickAction) {
         Button button = new Button(label);
-        button.addClickListener(event -> {
-            sortField = "firstName";
-            ascending = isAscending;
-            updateGrid();
-        });
+        button.addClickListener(event -> onClickAction.run());
         return button;
     }
-    private void configureGrid() {
-        grid = new VGrid<>(Employee.class);
-        grid.setColumns("firstName", "lastName", "status");
-        grid.setAllRowsVisible(true);
-        grid.addComponentColumn(employee -> createStatusComboBox()).setHeader("Change Status");
-        grid.addComponentColumn(employee -> createEditButton());
-        grid.addComponentColumn(employee -> createSaveButton());
-        add(grid);
-    }
 
-    private ComboBox<String> createStatusComboBox() {
-        ComboBox<String> statusComboBox = new ComboBox<>();
-        statusComboBox.setItems("Active", "Inactive");
-        return statusComboBox;
-    }
-
-    private Button createEditButton() {
-        return new Button("Edit");
-    }
-    private Button createSaveButton() {
-        return new Button("Save");
-    }
-
-    private void addNavigationButtons() {
-        final HorizontalLayout hf = new HorizontalLayout();
-        previous = createNavigationButton("Previous", -1);
-        next = createNavigationButton("Next", 1);
-        hf.add(previous, next, createAddEmployeeButton());
-        add(hf);
-    }
-
-    private Button createNavigationButton(String label, int increment) {
-        Button button = new Button(label);
-        button.addClickListener(event -> handlePageChange(increment));
-        return button;
-    }
-    private void handlePageChange(int increment) {
-        if (isPageChangeValid(increment)) {
-            currentPage += increment;
-            updateGrid();
-        } else {
-            showNotification("No existen más datos en lista.");
-        }
-    }
-    private boolean isPageChangeValid(int increment) {
-        if (increment < 0) {
-            return currentPage > 1;
-        } else if (increment > 0) {
-            return employeeService.hasNextPage(currentPage, pageSize, sortField, ascending);
-        }
-        return false;
-    }
-    private void showNotification(String message) {
-        Notification notification = new Notification(message, 3000, Notification.Position.BOTTOM_END);
-        notification.open();
-    }
     private Button createAddEmployeeButton() {
-        return new Button("Add Employee", event ->
-                getUI().flatMap(ui -> ui.navigate(EmployeeView.class, "new"))
-        );
+        return createButton("Add Employee", this::navigateToAddEmployeeView);
     }
-    private void updateGrid() {
-        Page<Employee> page = employeeService.getEmployeesPaginated(currentPage, pageSize, sortField, ascending);
-        grid.setItems(page.getContent());
+
+    private void navigateToEditView(Employee employee) {
+        getUI().ifPresent(ui -> ui.navigate(EmployeeView.class, employee.getId().toString()));
+    }
+
+    private void navigateToAddEmployeeView() {
+        getUI().ifPresent(ui -> ui.navigate(EmployeeView.class, "new"));
+    }
+
+    private void navigateToSaveChangeStatus(Employee employee) {
+        // no-op
+    }
+
+    private void setupPagingGrid() {
+        table.setPaginationBarMode(PagingGrid.PaginationBarMode.BOTTOM);
+        table.setPageSize(5);
+    }
+
+    private void refreshGrid() {
+        table.setPagingDataProvider((page, pageSize) -> fetchEmployees((int) page, pageSize));
+    }
+
+    private List<Employee> fetchEmployees(int page, int pageSize) {
+        int start = page * pageSize;
+        if (hasSortOrder()) {
+            return fetchSortedEmployees(start, pageSize);
+        }
+        return employeeService.findEmployees(start, pageSize);
+    }
+
+    private boolean hasSortOrder() {
+        return !table.getSortOrder().isEmpty();
+    }
+
+    private List<Employee> fetchSortedEmployees(int start, int pageSize) {
+        GridSortOrder<Employee> sortOrder = table.getSortOrder().getFirst();
+        return employeeService.findEmployees(start, pageSize, sortOrder.getSorted().getKey(), sortOrder.getDirection() == SortDirection.ASCENDING);
+    }
+
+    @FunctionalInterface
+    private interface ButtonClickHandler {
+        void handle(Employee employee);
     }
 }