JFile Tree General Manipulation

[djdanjo82]

Hello All! First thanks for viewing this thread. My issue is I have a class below that I want to call and the constructor requires a File variable and I do not understand how to declare this so I can call it from my main class. My last issue is this class recursively displays all the Files/Directories in my java package for eclipse. How can I get this class to just display a single directory or better yet how can I get this class to filter and display only .xml files? Thanks a lot for your help. The file tree class is displayed below:

Dan

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Container;
import java.awt.Dimension;
import java.io.File;
import java.util.Collections;
import java.util.Vector;

import javax.swing.BoxLayout;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTree;
import javax.swing.event.TreeSelectionEvent;
import javax.swing.event.TreeSelectionListener;
import javax.swing.tree.DefaultMutableTreeNode;

/**
 * Display a file system in a JTree view
 * 
 * @version $Id: FileTree.java,v 1.9 2004/02/23 03:39:22 ian Exp $
 * @author Ian Darwin
 */
public class FileTree extends JPanel {
  /** Construct a FileTree */
  public FileTree(File dir) {
    setLayout(new BorderLayout());

    // Make a tree list with all the nodes, and make it a JTree
    JTree tree = new JTree(addNodes(null, dir));

    // Add a listener
    tree.addTreeSelectionListener(new TreeSelectionListener() {
      public void valueChanged(TreeSelectionEvent e) {
        DefaultMutableTreeNode node = (DefaultMutableTreeNode) e
            .getPath().getLastPathComponent();
        System.out.println("You selected " + node);
      }
    });

    // Lastly, put the JTree into a JScrollPane.
    JScrollPane scrollpane = new JScrollPane();
    scrollpane.getViewport().add(tree);
    add(BorderLayout.CENTER, scrollpane);
  }

  /** Add nodes from under "dir" into curTop. Highly recursive. */
  DefaultMutableTreeNode addNodes(DefaultMutableTreeNode curTop, File dir) {
    String curPath = dir.getPath();
    DefaultMutableTreeNode curDir = new DefaultMutableTreeNode(curPath);
    if (curTop != null) { // should only be null at root
      curTop.add(curDir);
    }
    Vector ol = new Vector();
    String[] tmp = dir.list();
    for (int i = 0; i < tmp.length; i++)
      ol.addElement(tmp[i]);
    Collections.sort(ol, String.CASE_INSENSITIVE_ORDER);
    File f;
    Vector files = new Vector();
    // Make two passes, one for Dirs and one for Files. This is #1.
    for (int i = 0; i < ol.size(); i++) {
      String thisObject = (String) ol.elementAt(i);
      String newPath;
      if (curPath.equals("."))
        newPath = thisObject;
      else
        newPath = curPath + File.separator + thisObject;
      if ((f = new File(newPath)).isDirectory())
        addNodes(curDir, f);
      else
        files.addElement(thisObject);
    }
    // Pass two: for files.
    for (int fnum = 0; fnum < files.size(); fnum++)
      curDir.add(new DefaultMutableTreeNode(files.elementAt(fnum)));
    return curDir;
  }

  public Dimension getMinimumSize() {
    return new Dimension(200, 400);
  }

  public Dimension getPreferredSize() {
    return new Dimension(200, 400);
  }

  /** Main: make a Frame, add a FileTree */
  public static void main(String[] av) {

    JFrame frame = new JFrame("FileTree");
    frame.setForeground(Color.black);
    frame.setBackground(Color.lightGray);
    Container cp = frame.getContentPane();

    if (av.length == 0) {
      cp.add(new FileTree(new File(".")));
    } else {
      cp.setLayout(new BoxLayout(cp, BoxLayout.X_AXIS));
      for (int i = 0; i < av.length; i++)
        cp.add(new FileTree(new File(av[i])));
    }

    frame.pack();
    frame.setVisible(true);
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
  }
}

[javaAddict]

Firstly I don't believe that this is your code.

Secondly look at the API of the File class. It has a method that accepts a filter and returns the file names that satisfy that filter.

The method is similar with the one used at the code so would be able to figure out what to change.

And most important: USE CODE TAGS

[peter_budo]

Java Cookbook, Second Edition

As javaAddict mentioned use filter on JFileChooser

[djdanjo82]

Firstly I don't believe that this is your code.

Secondly look at the API of the File class. It has a method that accepts a filter and returns the file names that satisfy that filter.

The method is similar with the one used at the code so would be able to figure out what to change.

And most important: USE CODE TAGS

Thanks for the reply,
This code is not mine. You are right. I am doing a research project I was hoping I could use this class or at least understand what is going on. I am not really a software guy so I am just confused I suppose how to initialize the file variable. And then make this class come up after being called from my main class. I will try to read more. I just have been working on this for a few hours and I am making very slow progress. Thanks for the feedback though.

Dan

[javaAddict]

If you read carefully the main code you will see how the class is being initialized and used. The class extends JPanel. You cannot initialize it and use it on its own the way you think.
Read about java swing and how to create GUIs. Try to understand how JPanels are used