JTree: Set custom ouvert/fermé des icônes pour les différents groupes

1. Je sais comment personnaliser les feuilles des icônes dans JTree
2. Je sais comment personnaliser fermeture/ouverture des icônes pour tous les nœuds du groupe

Mais je ne peux pas définir personnalisé ouvert/fermé les icônes en fonction du groupe de noms de nœud, par exemple de nœud pourrait être appelé e-Mails (donc c'est agréable d'avoir une enveloppe icône) ou un groupe peut être appelé les tâches et ainsi de suite.

J'ai essayé de le faire en remplaçant la getTreeCellRendererComponent méthode de classe DefaultTreeCellRenderer

Mais en changeant la icon pour le courant node affectera pour le prochain nœud seulement!

Comment personnaliser ouvert/fermé des icônes pour les différents groupes?

Veuillez jeter un oeil à mon code:

Employee.java

package com.ehsunbehravesh.swing;

import java.util.Random;

public class Employee {

  public String name;
  public int id;
  public boolean isBoss;
  public Employee[] employees;

  public Employee(String name, boolean isBoss) {
    this.name = name;
    this.isBoss = isBoss;
    this.id = new Random(System.currentTimeMillis()).nextInt(Integer.MAX_VALUE);
  }  

  @Override
  public String toString() {
    return this.name;
  }

    static String randomName() {
    String chars = "abcdefghijklmnopqrstuvwxyz";
    StringBuilder builder = new StringBuilder();
    Random r = new Random(System.currentTimeMillis());
    int length = r.nextInt(10) + 1;
    for (int i = 0; i < length; i++) {
      builder.append(chars.charAt(r.nextInt(chars.length())));
    }

    return builder.toString();
  }
}

CustomTreeNode.java

package com.ehsunbehravesh.swing;

import javax.swing.ImageIcon;
import javax.swing.tree.DefaultMutableTreeNode;

public class CustomTreeNode extends DefaultMutableTreeNode {

  /**
   * The icon which is displayed on the JTree object. open, close, leaf icon.
   */
  private ImageIcon icon;

  public CustomTreeNode(ImageIcon icon) {
    this.icon = icon;
  }

  public CustomTreeNode(ImageIcon icon, Object userObject) {
    super(userObject);
    this.icon = icon;
  }

  public CustomTreeNode(ImageIcon icon, Object userObject, boolean allowsChildren) {
    super(userObject, allowsChildren);
    this.icon = icon;
  }

  public ImageIcon getIcon() {
    return icon;
  }

  public void setIcon(ImageIcon icon) {
    this.icon = icon;
  }    
}

CustomeTreeCellRenderer.java

package com.ehsunbehravesh.swing;

import java.awt.Component;
import javax.swing.JTree;
import javax.swing.tree.DefaultTreeCellRenderer;

class CustomeTreeCellRenderer extends DefaultTreeCellRenderer {

  public CustomeTreeCellRenderer() {
  }

  @Override
  public Component getTreeCellRendererComponent(JTree tree, Object value, boolean selected, boolean expanded, boolean leaf, int row, boolean hasFocus) {
    super.getTreeCellRendererComponent(tree, value, leaf, expanded, leaf, row, hasFocus);

    if (!leaf) {
      CustomTreeNode node = (CustomTreeNode) value;
      System.out.println(((Employee) node.getUserObject()).name);

      if (node.getIcon() != null) {
        System.out.println(node.getIcon().toString());
        setClosedIcon(node.getIcon());
        setOpenIcon(node.getIcon());
      } else {
        setClosedIcon(getDefaultClosedIcon());
        setClosedIcon(getDefaultOpenIcon());
        setOpenIcon(getDefaultOpenIcon());
      }
    }

    return this;
  }
}

Test1.java

package com.ehsunbehravesh.swing;
import java.awt.BorderLayout;
import java.awt.Color;
import javax.swing.ImageIcon;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JTree;
import javax.swing.tree.DefaultTreeModel;
class TreeSample {
public static void main(String args[]) {
JFrame f = new JFrame("JTree Sample");
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JPanel pnlMain = new JPanel(new BorderLayout());
pnlMain.setBackground(Color.white);
createTree(pnlMain);
f.setContentPane(pnlMain);
f.setSize(300, 200);
f.setVisible(true);
}
private static void createTree(JPanel pnlMain) {
Employee bigBoss = new Employee(Employee.randomName(), true);
Employee[] level1 = new Employee[5];    
bigBoss.employees = level1;
for (int i = 0; i < level1.length; i++) {
level1[i] = new Employee(Employee.randomName(), true);      
}
for (int i = 0; i < level1.length; i++) {
Employee employee = level1[i];
if (employee.isBoss) {
int count = 5;
employee.employees = new Employee[count];
for (int j = 0; j < employee.employees.length; j++) {
employee.employees[j] = new Employee(Employee.randomName(), false);          
}
}
}
CustomTreeNode root = new CustomTreeNode(new ImageIcon("images/Circle_3.gif"), bigBoss);           
DefaultTreeModel model = new DefaultTreeModel(root);
for (Employee employee : bigBoss.employees) {
CustomTreeNode boss = new CustomTreeNode(new ImageIcon("images/Circle_2.gif"), employee);
root.add(boss);
if (employee.isBoss) {                
for (Employee employee1 : employee.employees) {
CustomTreeNode emp = new CustomTreeNode(new ImageIcon("images/Circle_1.gif"), employee1);
boss.add(emp);
}
}
}
JTree tree = new JTree(model);
tree.setCellRenderer(new CustomeTreeCellRenderer());            
pnlMain.add(tree, BorderLayout.CENTER);
}  
}