import EDU.neu.ccs.demeter.dj.*;
//import EDU.neu.ccs.demeter.dj.ClassGraph;

import DuVisitor;
import Node;
import HardLink;
import SoftLink;
import java.util.*;

public class Directory extends Node {

   Directory()
   {
      listIterator = new Vector();
      setSize(11);
   }

   Directory(String name)
   {
      setName(name);
      setSize(11);
      listIterator = new Vector();
   }

   int GetTotalSize(String option)
   {
//   Commented out the next 2 lines to introduce DJ.
/*      Accept(du);
      return (du.getSize());
*/
     Strategy sg = new Strategy("from Directory to {SoftLink, File}"); 
     TraversalGraph tg = TraversalGraph.compute(OS.cg, sg);
     DuVisitor v = new DuVisitor(option);
     tg.traverse(this, v);

     return (v.getSize());

   }
/*
   void Accept(DuVisitor du)
   {
     for (int i = 0; i < listIterator.size(); i++)
     {
	Node n = (Node) listIterator.elementAt(i);
        n.Accept(du);
     }
     du.before(this);
   }
*/
   Directory Mkdir(String name)
   {
      // add some checking for path and to check if directory 
      // already exists.
      if (hasWritePermissions())
      {
	Directory dir = new Directory(name);
      	listIterator.addElement(dir);
      	return (dir);
      }
      else
      {
     	System.out.println("You don't have write permissions");
	return (null);
      }
   }

   void CreateFile(String name)
   {
//      if (hasWritePermissions())
//      {
      	File f = new File(name);
	listIterator.addElement(f);
//      } 
//      else
//     	System.out.println("You don't have write permissions");
   }
  
   void CreateHardLink(String name , Node linkTo)
   {
      HardLink l = new HardLink(name);
     listIterator.addElement(linkTo);
   }
  
   void CreateSoftLink(String name , Node linkTo)
   {
      SoftLink l = new SoftLink(name,linkTo);
     listIterator.addElement(l);
   }

   void List()
   {
     for (int i = 0; i < listIterator.size(); i++)
     {
        Node n = (Node) listIterator.elementAt(i);
 	System.out.print("   " +  n.getName());
     }
   }

   void moveFile(String f1, String name)
   {

     for (int i = 0; i < listIterator.size(); i++)
     {
        Node n = (Node) listIterator.elementAt(i);
 	if (n.getName().equals(f1))
        {
            n.setName(name);
	    listIterator.setElementAt(n,i);
	    return;
	}
     }
            
   }

  public boolean hasWritePermissions()
  {
       return(true);
  }

   Vector listIterator;  
}