Add refresh button

Simpify when I add a folder outside of the program and want it to show
up. I could also add a filewatch onto the folder itself and do this
automatically, but a the moment I don't want to deal with the various
events I'd likely need to keep track of, as we'd probably want to be
smart and update the tree wherever the event was for things like renames
(though the naive approach would be to just refresh the entire tree,
which is non-performant but simple)

src/main/java/com/peetseater/filesorter/trees/AbstractFileTreePanel.java

@@ -26,6 +26,8 @@
 public abstract class AbstractFileTreePanel extends JPanel implements ActionListener, FileVisitor<Path> {
 
     JButton browseButton = new JButton("Browse");
+    JButton refreshButton = new JButton("Refresh");
+    transient Path loadedPath = null;
     DefaultMutableTreeNode rootNode;
     JTree jTree;
     String browseText;
@@ -48,13 +50,21 @@ protected AbstractFileTreePanel(String browseText, boolean onlyIncludeDirectorie
         jTree.setEditable(false);
         jTree.getSelectionModel().setSelectionMode(TreeSelectionModel.SINGLE_TREE_SELECTION);
         jTree.setShowsRootHandles(true);
+
+
 
 
         setLayout(new BoxLayout(this, BoxLayout.Y_AXIS));
-        add(browseButton);
+        JPanel buttonPanel = new JPanel();
+        BoxLayout sideBySideButtons = new BoxLayout(buttonPanel, BoxLayout.X_AXIS);
+
+        buttonPanel.add(browseButton);
+        buttonPanel.add(refreshButton);
+        add(buttonPanel);
         add(scrollPane);
 
         browseButton.addActionListener(this);
+        refreshButton.addActionListener(this);
     }
 
     DefaultMutableTreeNode currentParent = rootNode;
@@ -77,9 +87,14 @@ public void loadPath(Path rootPath) {
     @Override
     public void actionPerformed(ActionEvent e) {
         AppLogger.info("FileTreePanel with text \"" + browseText + "\" button clicked " + this.rootNode);
-        if (jFileChooser.showOpenDialog(this.getParent()) == JFileChooser.APPROVE_OPTION) {
-            File file = jFileChooser.getSelectedFile();
-            this.loadPath(file.toPath());
+        if (e.getActionCommand().equals("Refresh")) {
+            this.loadPath(this.loadedPath);
+        } else if (e.getActionCommand().equals(this.browseText)) {
+            if (jFileChooser.showOpenDialog(this.getParent()) == JFileChooser.APPROVE_OPTION) {
+                File file = jFileChooser.getSelectedFile();
+                this.loadPath(file.toPath());
+                this.loadedPath = file.toPath();
+            }
         }
     }