Swingworker with FileVisitor class and walkFileTree(), which iterates internally over a “set” of files in a directory tree; where to publish()?

Question

It seems like the long-running tree walker task should be defined in a class like so:

  public class TreeWalker extends SwingWorker implements         


        

Answer 1

Since @Madprogrammer didn't use a GUI and DID use get() [which WAITS until execution of doInBackground() finishes], I added a GUI, modified his publish(), and included a call to done(), just as icing on the cake. My own tree walker doesn't work yet, but Mad's shown me the way. Here are the highlights of the new Mad-with-GUI version.

public class TreeWalkerExample {

  static GUI gui;

  public static void main(String args[]) 
  {...invokelater...
     public void run() { 
       gui = new GUI(); 
       gui.setVisible(true); }
   }

      public TreeWalkerExample() { 
        (new TreeWalker()).execute();  
      }

      public class TreeWalker extends SwingWorker implements FileVisitor {

          protected Void doInBackground() throws Exception {
              Path p = Paths.get("C:\\","Users","\\Dave","\\Documents","\\Java");
              gui.appendOutput(p.toString());
              Files.walkFileTree(p, this);
              return null;
          }

          public FileVisitResult visitFile(Path file, BasicFileAttributes a) throws IOException{
              publish(file);
              return FileVisitResult.CONTINUE;
          }

          protected void process(List chunks) {
              for (Path p : chunks) 
                gui.appendOutput(p.getFileName().toString());
          }

          protected void done(){
              gui.appendOutput("\nDone");
          }
    }
    ===================================================================================================
    public class GUI extends javax.swing.JFrame {

      JTextArea output;

      private void btnWalkMouseClicked(java.awt.event.MouseEvent evt) {                                     
        new TreeWalkerExample();
      }                                    

      public void appendOutput(String s){
        output.append("\n" + s);
      }