Added if dataset open/add incase dataset is null to all pages that require a non null dataset to exist.

src/main/java/seng202/group9/Controller/App.java

@@ -90,20 +90,6 @@ public class App extends Application
 		} catch (Exception e){
 			e.printStackTrace();
 		}
-		//testing out dataset
-		try {
-			if (session.getCurrentDataset() != null) {
-				currentDataset = new Dataset(session.getCurrentDataset(), Dataset.getExisting);
-			}else{
-				createPopUpStage(SceneCode.DATASET_CONTROLLER, 600, 400);
-			}
-		}catch (DataException e){
-			createPopUpStage(SceneCode.DATASET_CONTROLLER, 600, 400);
-		}catch (NullPointerException e){
-			createPopUpStage(SceneCode.DATASET_CONTROLLER, 600, 400);
-		}catch (Exception e){
-			createPopUpStage(SceneCode.DATASET_CONTROLLER, 600, 400);
-		}
 		//after all loading then load the previous session
 		if (session.getSceneDisplayed() != null) {
 			menuController.replaceSceneContent(session.getSceneDisplayed());
@@ -255,36 +241,4 @@ public class App extends Application
 		}
 	}
 
-	public Stage createPopUpStage(SceneCode scene, int width, int height) {
-		FXMLLoader loader = new FXMLLoader();
-		InputStream in = getClass().getClassLoader().getResourceAsStream(scene.getFilePath());
-		Parent page = null;
-		try {
-			page = loader.load(in);
-		} catch (IOException e) {
-			e.printStackTrace();
-		} finally {
-			try {
-				in.close();
-			} catch (IOException e) {
-				e.printStackTrace();
-			}
-		}
-		//set contorller and call default calls
-		Controller controller = (Controller) loader.getController();
-		controller.setApp(this);
-		controller.load();
-		controller.loadOnce();
-		//create a new stage to popup
-		Stage popupStage = new Stage();
-		popupStage.initModality(Modality.WINDOW_MODAL);
-		//inner layout constraints
-		VBox container = new VBox();
-		container.getChildren().add(page);
-		Scene popupScene = new Scene(container, width, height);
-		//show
-		popupStage.setScene(popupScene);
-		popupStage.showAndWait();
-		return popupStage;
-	}
 }

src/main/java/seng202/group9/GUI/AirlineRDController.java

@@ -49,6 +49,9 @@ public class AirlineRDController extends Controller {
      * Also sets up the dropdown menu options.
      */
     public void load() {
+        if (!checkDataset()){
+            return;
+        }
         //Sets up the table columns to be ready for use for Airline data
         airlIDCol.setCellValueFactory(new PropertyValueFactory<Airline, String>("ID"));
         airlNameCol.setCellValueFactory(new PropertyValueFactory<Airline, String>("Name"));

src/main/java/seng202/group9/GUI/AirlineSummaryController.java

@@ -48,6 +48,9 @@ public class AirlineSummaryController extends Controller{
      * Loads initial state of the scene.
      */
     public void load() {
+        if (!checkDataset()){
+            return;
+        }
         //Fills the table.
         columnName.setCellValueFactory(new PropertyValueFactory<Airline, String>("Name"));
         columnAlias.setCellValueFactory(new PropertyValueFactory<Airline, String>("Alias"));

src/main/java/seng202/group9/GUI/AirportAnalyser.java

@@ -71,6 +71,9 @@ public class AirportAnalyser extends Controller {
      * Takes the current dataset then loads the data to the graph using build graph.
      */
     public void load() {
+        if (!checkDataset()){
+            return;
+        }
         currentdata = getParent().getCurrentDataset();
         build_graph();
     }

src/main/java/seng202/group9/GUI/AirportEditController.java

@@ -72,6 +72,9 @@ public class AirportEditController extends Controller {
     }
 
     public void load() {
+        if (!checkDataset()){
+            return;
+        }
         theDataSet = getParent().getCurrentDataset();
         currentSession = getParent().getSession();
 

src/main/java/seng202/group9/GUI/AirportRDController.java

@@ -59,6 +59,11 @@ public class AirportRDController extends Controller{
      * Also sets up the dropdown menu options.
      */
     public void load() {
+        if (!checkDataset()){
+            return;
+        }
+        theDataSet = getParent().getCurrentDataset();
+        if (theDataSet != null) {
             //Sets up the table columns to be ready for use for Airport data
             airpIDCol.setCellValueFactory(new PropertyValueFactory<Airport, String>("ID"));
             airpNameCol.setCellValueFactory(new PropertyValueFactory<Airport, String>("Name"));
@@ -74,12 +79,12 @@ public class AirportRDController extends Controller{
             airpTzCol.setCellValueFactory(new PropertyValueFactory<Airport, String>("Tz"));
 
             //Assigning the Dataset to the current Dataset's airports and displaying it in a table
-        theDataSet = getParent().getCurrentDataset();
             currentSession = getParent().getSession();
 
             tableViewAirportRD.setItems(observableArrayList(theDataSet.getAirports()));
             tableViewAirportRD.getSelectionModel().setSelectionMode(SelectionMode.MULTIPLE);
         }
+    }
 
     public void openAdd() {
         createPopUpStage(SceneCode.AIRPORT_ADD, 600, 480);

src/main/java/seng202/group9/GUI/AirportSummaryController.java

@@ -72,6 +72,9 @@ public class AirportSummaryController extends Controller{
      * Loads initial state of the scene.
      */
     public void load() {
+        if (!checkDataset()){
+            return;
+        }
         currentData = getParent().getCurrentDataset();
         columnName.setCellValueFactory(new PropertyValueFactory<Airport, String>("Name"));
         columnCity.setCellValueFactory(new PropertyValueFactory<Airport, String>("CityName"));

src/main/java/seng202/group9/GUI/Controller.java

@@ -4,6 +4,7 @@ import javafx.fxml.FXMLLoader;
 import javafx.fxml.Initializable;
 import javafx.scene.Parent;
 import javafx.scene.Scene;
+import javafx.scene.control.Alert;
 import javafx.scene.layout.VBox;
 import javafx.stage.Modality;
 import javafx.stage.Stage;
@@ -58,6 +59,23 @@ public abstract class Controller implements Initializable{
         }
     }
 
+    public boolean checkDataset(){
+        //if the dataset is null then we want to change to the initial and give a warning.
+        //Also then let them selecthe data set
+        if (getParent().getCurrentDataset() == null) {
+            replaceSceneContent(SceneCode.INITIAL);
+            Alert alert = new Alert(Alert.AlertType.WARNING);
+            alert.setTitle("Missing Dataset");
+            alert.setHeaderText("No Dataset is currently selected.");
+            alert.setContentText("Please Create a Dataset to store your Information in.");
+            alert.showAndWait();
+            createPopUpStage(SceneCode.DATASET_CONTROLLER, 600, 400);
+            return false;
+        }else{
+            return true;
+        }
+    }
+
     /**
      * Creates a popup window with a specific fxml scene
      * @param scene

src/main/java/seng202/group9/GUI/DistCalcController.java

@@ -67,6 +67,9 @@ public class DistCalcController extends Controller {
      * Sets the initial state of the scene.
      */
     public void load(){
+        if (!checkDataset()){
+            return;
+        }
         currentData = getParent().getCurrentDataset();
         answerBox.textProperty().bind(bound);
         fill_boxes();

src/main/java/seng202/group9/GUI/FlightAddController.java

@@ -32,6 +32,9 @@ public class FlightAddController extends Controller {
     private Session currentSession = null;
 
     public void load() {
+        if (!checkDataset()){
+            return;
+        }
         theDataSet = getParent().getCurrentDataset();
         currentSession = getParent().getSession();
     }

src/main/java/seng202/group9/GUI/FlightEditorController.java

@@ -81,6 +81,9 @@ public class FlightEditorController extends Controller{
      * Loader which is used to load the selected information into the text fields for editing.
      */
     public void load() {
+        if (!checkDataset()){
+            return;
+        }
         theDataSet = getParent().getCurrentDataset();
 
         Session session = getParent().getSession();

src/main/java/seng202/group9/GUI/FlightRDController.java

@@ -102,6 +102,9 @@ public class FlightRDController extends Controller {
      * Used to load the table for the Flight points initially from the MenuController
      */
     public void load() {
+        if (!checkDataset()){
+            return;
+        }
         theDataSet = getParent().getCurrentDataset();
         if (theDataSet != null) {
             try {
@@ -127,7 +130,6 @@ public class FlightRDController extends Controller {
             }catch(IndexOutOfBoundsException e){
                 System.out.println("There is no Paths to show");
             }
-        }
             flightPathListView.getSelectionModel().selectedItemProperty().addListener(new ChangeListener<String>(){
                 public void changed(ObservableValue<? extends String> observable, String oldValue, String newValue) {
                     String flightPathDisplayNameClicked = flightPathListView.getSelectionModel().getSelectedItem();
@@ -147,6 +149,7 @@ public class FlightRDController extends Controller {
                 }
             });
         }
+    }
 
     /**
      *  Will take the inputs from the text fields and adds the point to the current flight path.

src/main/java/seng202/group9/GUI/FlightSummaryController.java

@@ -175,6 +175,9 @@ public class FlightSummaryController extends Controller {
      * Used to load the page from the MenuController.
      */
     public void load() {
+        if (!checkDataset()){
+            return;
+        }
         theDataSet = getParent().getCurrentDataset();
         if (theDataSet != null) {
             try {

src/main/java/seng202/group9/GUI/RouteAddController.java

@@ -74,6 +74,9 @@ public class RouteAddController extends Controller {
     }
 
     public void load() {
+        if (!checkDataset()){
+            return;
+        }
         theDataSet = getParent().getCurrentDataset();
     }
 }

src/main/java/seng202/group9/GUI/RouteAnalyser.java

@@ -85,6 +85,9 @@ public class RouteAnalyser extends Controller {
      * Takes the current dataset then loads the data to the graph using build graph.
      */
     public void load() {
+        if (!checkDataset()){
+            return;
+        }
         currentdata = getParent().getCurrentDataset();
         build_graph();
     }

src/main/java/seng202/group9/GUI/RouteEditController.java

@@ -58,6 +58,9 @@ public class RouteEditController extends Controller {
     }
 
     public void load() {
+        if (!checkDataset()){
+            return;
+        }
         theDataSet = getParent().getCurrentDataset();
         currentSession = getParent().getSession();
 

src/main/java/seng202/group9/GUI/RouteFilterController.java

@@ -86,6 +86,9 @@ public class RouteFilterController extends Controller {
     }
 
     public void load() {
+        if (!checkDataset()){
+            return;
+        }
         theDataSet = getParent().getCurrentDataset();
         currentSession = getParent().getSession();
     }

src/main/java/seng202/group9/GUI/RouteRDController.java

@@ -52,6 +52,9 @@ public class RouteRDController extends Controller {
      * Also sets up the dropdown menu options.
      */
     public void load() {
+        if (!checkDataset()){
+            return;
+        }
         //Sets up the table columns to be ready for use for Route data
         rAirlineCol.setCellValueFactory(new PropertyValueFactory<Route, String>("AirlineName"));
         rAirlineIDCol.setCellValueFactory(new PropertyValueFactory<Route, String>("AirlineID"));

src/main/java/seng202/group9/GUI/RouteSummaryController.java

@@ -43,6 +43,9 @@ public class RouteSummaryController extends Controller{
      * Loads initial state of the scene.
      */
     public void load() {
+        if (!checkDataset()){
+            return;
+        }
         columnAirline.setCellValueFactory(new PropertyValueFactory<Route, String>("AirlineName"));
         columnDepart.setCellValueFactory(new PropertyValueFactory<Route, String>("DepartureAirport"));
         columnArrive.setCellValueFactory(new PropertyValueFactory<Route, String>("ArrivalAirport"));