Change all "Folder" to "Directory"

src/main/java/app/controllers/FiletreeController.java

@@ -62,9 +62,9 @@ public class FiletreeController implements Initializable, Controller {
     } catch (Exception e) {
       Model.setProjectPath(Optional.empty());
       DialogBoxes.showErrorMessage(
-        "Could not open folder.\n\n"
-        + "Do you have the right permissions for this folder?\n"
-        + "Or does the folder contain any shortcut to somewhere within itself?"
+        "Could not open directory.\n\n"
+        + "Do you have the right permissions for this directory?\n"
+        + "Or does the directory contain any shortcut to somewhere within itself?"
       );
     }
   }

src/main/java/app/events/OpenProjectEvent.java

@@ -6,15 +6,15 @@ import java.util.Optional;
 import app.model.Model;
 
 /**
- * Event signalizing that a folder is supposed to be opened in the filetree.
+ * Event signalizing that a directory is supposed to be opened in the filetree.
  */
 public class OpenProjectEvent extends Event {
 
     private Optional<Path> path;
 
     /**
-     * Event signalizing that a folder is supposed to be opened in the filetree.
-     * @param path The path of the folder to be opened
+     * Event signalizing that a directory is supposed to be opened in the filetree.
+     * @param path The path of the directory to be opened
      */
     public OpenProjectEvent(Optional<Path> path) {
         this.path = path;
@@ -22,7 +22,7 @@ public class OpenProjectEvent extends Event {
     }
 
     /**
-     * @return The path of the folder to be opened
+     * @return The path of the directory to be opened
      */
     public Optional<Path> getPath() {
         return this.path;

src/main/java/app/service/DialogBoxes.java

@@ -9,6 +9,10 @@ import javafx.stage.DirectoryChooser;
 import javafx.stage.FileChooser;
 import javafx.stage.Stage;
 
+/**
+ * Class containing static methods for different kinds of popup window interactions
+ * with the user.
+ */
 public class DialogBoxes {
 
   private DialogBoxes() {}
@@ -16,11 +20,24 @@ public class DialogBoxes {
   private static DirectoryChooser dc = new DirectoryChooser();
   private static Alert error = new Alert(AlertType.ERROR);
 
+  /**
+   * Shows a specified message to the user with an error icon.
+   * 
+   * @param errorMessage The message to show the user
+   */
   public static void showErrorMessage(String errorMessage) {
       error.setContentText(errorMessage);
       error.showAndWait();
   }
 
+  /**
+   * Shows an OS specific file chooser to choose a file on the disk
+   * 
+   * @param stage The JavaFX stage to connect to the dialog box. This is needed
+   *              for the window to be able to run on the JavaFX thread.
+   * 
+   * @return The file chosen through the dialog window
+   */
   public static File showopenFileWithDialog(Stage stage) {
     fc.setTitle("Open File");
     File chosenFile = fc.showOpenDialog(stage);
@@ -28,6 +45,14 @@ public class DialogBoxes {
     return chosenFile; 
   }
 
+  /**
+   * Shows an OS specific directory chooser to choose a directory on the disk
+   * 
+   * @param stage The JavaFX stage to connect to the dialog box. This is needed
+   *              for the window to be able to run on the JavaFX thread.
+   * 
+   * @return The file chosen through the dialog window
+   */
   public static File showOpenFolderWithDialog(Stage stage) {
     dc.setTitle("Open Project");
     File dir = dc.showDialog(stage);

src/main/java/app/service/FiletreeOperations.java

@@ -71,7 +71,7 @@ public class FiletreeOperations {
   }
 
   /**
-   * A helping function to sort the files/folders in the fileTree so that it shows
+   * A helping function to sort the files/directories in the fileTree so that it shows
    * in the correct order.
    */
   private static void sortFiles(List<File> dirList, List<File> fileList, File file) {

src/test/java/app/service/FileTreeOperationsTest.java

@@ -41,8 +41,8 @@ public class FileTreeOperationsTest {
   }
 
   private void createRecursiveSymlink() throws IOException {
-    File folders = new File(tmp, "test/innerFolder/");
-    folders.mkdirs();
+    File dirs = new File(tmp, "test/innerFolder/");
+    dirs.mkdirs();
 
     Path target = Paths.get(tmp.toPath().toString(), "test");
     Path link = Paths.get(tmp.toPath().toString(), "test/innerFolder/test");