1  import java.io.*;

  2  

  3  public class PrintVisitor implements FileSystemVisitor

  4  {

  5     public void visitFileNode(FileNode node)

  6     {

  7        for (int i = 0; i < level; i++) System.out.print(" ");

  8        System.out.println(node.getFile().getName());

  9     }

 10  

 11     public void visitDirectoryNode(DirectoryNode node)

 12     {

 13        for (int i = 0; i < level; i++) System.out.print(" ");

 14        System.out.println(node.getDirectory().getName());

 15        level++;

 16        for (FileSystemNode c : node.getChildren())

 17           c.accept(this);

 18        level--;

 19     }

 20  

 21     private int level = 0;

 22  }