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

@@ -23,6 +23,10 @@ public class DocumentService {
         documentRepository.save(newDocument);
     }
 
+    public void deleteDocument(final UUID id) {
+        documentRepository.deleteById(id);
+    }
+
     public List<Document> getAllDocuments() {
         return documentRepository.findAll();
     }
@@ -53,7 +57,10 @@ public class DocumentService {
         return employees.subList(start, end);
     }
 
-    public List<Document> findDocumentBy(DocumentType documentType, Employee employee, int start, int pageSize) {
+    public List<Document> findDocumentBy(final DocumentType documentType,
+                                         final Employee employee,
+                                         final int start,
+                                         final int pageSize) {
         List<Document> documents = documentRepository.findAll();
         if (documentType != null) {
             documents = documents.stream()

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

@@ -10,11 +10,15 @@ import com.vaadin.flow.component.button.Button;
 import com.vaadin.flow.component.combobox.ComboBox;
 import com.vaadin.flow.component.html.H2;
 import com.vaadin.flow.component.notification.Notification;
+import com.vaadin.flow.component.orderedlayout.HorizontalLayout;
 import com.vaadin.flow.component.textfield.TextField;
 import com.vaadin.flow.component.upload.Upload;
 import com.vaadin.flow.component.upload.receivers.MemoryBuffer;
 import com.vaadin.flow.router.*;
 import com.vaadin.flow.spring.annotation.SpringComponent;
+import elemental.json.Json;
+import elemental.json.JsonArray;
+import elemental.json.JsonObject;
 import jakarta.annotation.security.PermitAll;
 import org.springframework.context.annotation.Scope;
 import org.springframework.security.core.userdetails.UserDetails;
@@ -22,6 +26,7 @@ import org.vaadin.firitin.form.BeanValidationForm;
 import com.vaadin.flow.spring.security.AuthenticationContext;
 
 import java.io.IOException;
+import java.util.Base64;
 import java.util.List;
 import java.util.UUID;
 
@@ -41,8 +46,10 @@ public class DocumentView extends BeanValidationForm<Document> implements HasUrl
     private final DocumentService documentService;
     private final EmployeeService employeeService;
     private final AuthenticationContext authContext;
+
     private boolean fileUploaded = false;
     private Button saveButton;
+    private Button viewDocumentButton;
 
     public DocumentView(final DocumentService documentService,
                         final EmployeeService employeeService,
@@ -55,10 +62,14 @@ public class DocumentView extends BeanValidationForm<Document> implements HasUrl
     }
 
     private void initializeView() {
+        configureComponents();
+        configureUploadButton();
+    }
+
+    private void configureComponents() {
         setFileNameProperties();
         setDocumentTypeProperties();
         setEmployeeComboBoxProperties();
-        setUploadButtonProperties();
     }
 
     private void setFileNameProperties() {
@@ -77,24 +88,53 @@ public class DocumentView extends BeanValidationForm<Document> implements HasUrl
         employeeComboBox.setWidthFull();
     }
 
-    private void setUploadButtonProperties() {
+    private void configureUploadButton() {
         uploadButton.setMaxFiles(1);
         uploadButton.setAcceptedFileTypes(".pdf");
         uploadButton.addSucceededListener(event -> handleUploadSuccess());
     }
 
-    protected  Button createSaveButton() {
+    protected Button createSaveButton() {
         saveButton = new Button("Save");
         saveButton.addClickListener(event -> saveDocument());
         return saveButton;
     }
 
-    protected  Button createCloseButton() {
+    protected Button createCloseButton() {
         Button closeButton = new Button("Close");
         closeButton.addClickListener(event -> closeForm());
         return closeButton;
     }
 
+    protected Button createViewDocumentButton() {
+        viewDocumentButton = new Button("View Document");
+        viewDocumentButton.setEnabled(false);
+        viewDocumentButton.addClickListener(event -> viewDocument());
+        return viewDocumentButton;
+    }
+
+    private void viewDocument() {
+        Document document = getEntity();
+        if (document.getFileData() != null && document.getFileData().length > 0) {
+            String base64Data = Base64.getEncoder().encodeToString(document.getFileData());
+            String jsCode = createJsCodeForDocument(base64Data);
+            getElement().executeJs(jsCode);
+        } else {
+            Notification.show("No file data available to view.");
+        }
+    }
+
+    private String createJsCodeForDocument(final String base64Data) {
+        return "var byteCharacters = atob('" + base64Data + "');"
+                + "var byteNumbers = new Array(byteCharacters.length);"
+                + "for (var i = 0; i < byteCharacters.length; i++) {"
+                + "    byteNumbers[i] = byteCharacters.charCodeAt(i);"
+                + "}"
+                + "var byteArray = new Uint8Array(byteNumbers);"
+                + "var blob = new Blob([byteArray], { type: 'application/pdf' });"
+                + "var url = URL.createObjectURL(blob);"
+                + "window.open(url, '_blank');";
+    }
 
     private void closeForm() {
         navigateToDocumentsListView();
@@ -107,22 +147,19 @@ public class DocumentView extends BeanValidationForm<Document> implements HasUrl
     private void handleUploadSuccess() {
         fileUploaded = true;
         Notification.show("File uploaded successfully.");
+        viewDocumentButton.setEnabled(true);
     }
 
     private void saveDocument() {
         if (isFormValid()) {
-            Document document = getEntity();  // Obtenemos el documento actual del formulario
+            Document document = getEntity();
             document.setFileName(fileName.getValue());
             document.setDocumentType(documentType.getValue());
             document.setEmployee(employeeComboBox.getValue());
-            document.setFileData(readFileData());  // Actualizamos el archivo si es necesario
+            document.setFileData(readFileData());
+            setDocumentCreator(document);
 
-            authContext.getAuthenticatedUser(UserDetails.class).ifPresent(user -> {
+            documentService.saveDocument(document);
-                String creator = user.getUsername();
-                document.setCreator(creator);  // Asignar el nombre del creador al documento si corresponde
-            });
-
-            documentService.saveDocument(document);  // Guardamos el documento actualizado
             Notification.show("File saved successfully.");
             clearForm();
         } else {
@@ -130,6 +167,12 @@ public class DocumentView extends BeanValidationForm<Document> implements HasUrl
         }
     }
 
+    private void setDocumentCreator(final Document document) {
+        authContext.getAuthenticatedUser(UserDetails.class).ifPresent(user -> {
+            document.setCreator(user.getUsername());
+        });
+    }
+
     private boolean isFormValid() {
         return !fileName.isEmpty()
                 && documentType.getValue() != null
@@ -137,14 +180,6 @@ public class DocumentView extends BeanValidationForm<Document> implements HasUrl
                 && fileUploaded;
     }
 
-    private Document createDocument() {
-        Document document = new Document();
-        document.setFileName(fileName.getValue());
-        document.setDocumentType(documentType.getValue());
-        document.setFileData(readFileData());
-        return document;
-    }
-
     private byte[] readFileData() {
         try {
             return buffer.getInputStream().readAllBytes();
@@ -159,41 +194,8 @@ public class DocumentView extends BeanValidationForm<Document> implements HasUrl
         documentType.clear();
         employeeComboBox.clear();
         fileUploaded = false;
-    }
+        uploadButton.getElement().setPropertyJson("files", Json.createArray());
-
+        viewDocumentButton.setEnabled(false);
-    private void checkFormModifications() {
-        boolean hasModifications = !fileName.isEmpty()
-                && documentType.getValue() != null
-                && employeeComboBox.getValue() != null;
-
-        if (hasModifications || fileUploaded) {
-            saveButton.setEnabled(true);
-        } else {
-            saveButton.setEnabled(false);
-        }
-    }
-
-
-    @Override
-    public void setParameter(final BeforeEvent beforeEvent, final String action) {
-        final RouteParameters params = beforeEvent.getRouteParameters();
-        final String s = params.get("documentId").orElse(null);
-
-        if ("new".equals(action)) {
-            setEntityWithEnabledSave(new Document());
-        } else {
-            UUID documentId = UUID.fromString(s);
-            var document = documentService.getDocument(documentId);
-            setEntity(document);
-            employeeComboBox.setValue(document.getEmployee());
-
-            if ("edit".equals(action) && !s.isEmpty()) {
-                setFieldsReadOnly(false);
-            } else if ("view".equals(action) && !s.isEmpty()) {
-                setFieldsReadOnly(true);
-            }
-        }
-        checkFormModifications();
     }
 
     private void setFieldsReadOnly(final boolean option) {
@@ -202,8 +204,49 @@ public class DocumentView extends BeanValidationForm<Document> implements HasUrl
         employeeComboBox.setReadOnly(option);
     }
 
+    private void preLoadFile(final Document document) {
+        JsonArray jsonArray = Json.createArray();
+        JsonObject jsonObject = Json.createObject();
+        jsonObject.put("name", document.getFileName());
+        jsonObject.put("progress", 100);
+        jsonObject.put("complete", true);
+        jsonArray.set(0, jsonObject);
+        uploadButton.getElement().setPropertyJson("files", jsonArray);
+    }
+
+    @Override
+    public void setParameter(final BeforeEvent beforeEvent, final String action) {
+        final RouteParameters params = beforeEvent.getRouteParameters();
+        final String documentIdString = params.get("documentId").orElse(null);
+
+        if ("new".equals(action)) {
+            setEntityWithEnabledSave(new Document());
+        } else {
+            UUID documentId = UUID.fromString(documentIdString);
+            Document document = documentService.getDocument(documentId);
+            setEntity(document);
+            employeeComboBox.setValue(document.getEmployee());
+            preLoadFile(document);
+            configureViewOrEditAction(action, documentIdString);
+        }
+    }
+
+    private void configureViewOrEditAction(final String action, final String documentIdString) {
+        if ("edit".equals(action) && !documentIdString.isEmpty()) {
+            setFieldsReadOnly(false);
+            preLoadFile(getEntity());
+        } else if ("view".equals(action) && !documentIdString.isEmpty()) {
+            setFieldsReadOnly(true);
+            saveButton.setEnabled(false);
+            viewDocumentButton.setEnabled(true);
+        }
+    }
+
     @Override
     protected List<Component> getFormComponents() {
-        return List.of(title, fileName, documentType, employeeComboBox, uploadButton, createCloseButton());
+        HorizontalLayout buttonLayout = new HorizontalLayout();
+        buttonLayout.add(uploadButton, createViewDocumentButton());
+        buttonLayout.setSpacing(true);
+        return List.of(title, fileName, documentType, employeeComboBox, buttonLayout, createCloseButton());
     }
 }

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

@@ -11,7 +11,6 @@ import com.vaadin.flow.component.combobox.ComboBox;
 import com.vaadin.flow.component.grid.GridSortOrder;
 import com.vaadin.flow.component.html.Main;
 import com.vaadin.flow.component.html.Span;
-import com.vaadin.flow.component.notification.Notification;
 import com.vaadin.flow.data.provider.SortDirection;
 import com.vaadin.flow.router.PageTitle;
 import com.vaadin.flow.router.Route;
@@ -112,7 +111,7 @@ public class DocumentsListView extends Main {
         return allEmployeesOption;
     }
 
-    private String getEmployeeLabel(Employee employee) {
+    private String getEmployeeLabel(final Employee employee) {
         return employee.getFirstName().equals("All") ? "All" : employee.getFirstName() + " " + employee.getLastName();
     }
 
@@ -137,26 +136,29 @@ public class DocumentsListView extends Main {
         documentGrid.setPageSize(5);
     }
 
-    private void updateDocumentGrid(DocumentType documentType, Employee employee) {
+    private void updateDocumentGrid(final DocumentType documentType, final Employee employee) {
         DocumentType finalDocumentType = isValidDocumentType(documentType) ? documentType : null;
         Employee finalEmployee = isValidEmployee(employee) ? employee : null;
         documentGrid.setPagingDataProvider((page, pageSize) ->
-                (finalDocumentType == null && finalEmployee == null) ?
+                (finalDocumentType == null && finalEmployee == null)
-                        fetchDocuments((int) page, pageSize) :
+                        ? fetchDocuments((int) page, pageSize)
-                        fetchFilteredDocuments((int) page, pageSize, finalDocumentType, finalEmployee)
+                        : fetchFilteredDocuments((int) page, pageSize, finalDocumentType, finalEmployee)
         );
         documentGrid.getDataProvider().refreshAll();
     }
 
-    private boolean isValidDocumentType(DocumentType documentType) {
+    private boolean isValidDocumentType(final DocumentType documentType) {
         return documentType != null && !"All".equals(documentType.name());
     }
 
-    private boolean isValidEmployee(Employee employee) {
+    private boolean isValidEmployee(final Employee employee) {
         return employee != null && !"All".equals(employee.getFirstName());
     }
 
-    private List<Document> fetchFilteredDocuments(int page, int pageSize, final DocumentType documentType, final Employee employee) {
+    private List<Document> fetchFilteredDocuments(final int page,
+                                                  final int pageSize,
+                                                  final DocumentType documentType,
+                                                  final Employee employee) {
         return documentService.findDocumentBy(documentType, employee, page, pageSize);
     }
 
@@ -191,7 +193,7 @@ public class DocumentsListView extends Main {
         return resource;
     }
 
-    private void openDocumentStream(StreamResource resource, UI ui) {
+    private void openDocumentStream(final StreamResource resource, final UI ui) {
         StreamRegistration registration = ui.getSession().getResourceRegistry().registerResource(resource);
         ui.getPage().open(registration.getResourceUri().toString());
     }