public void readSource(String input)
   {
	   StringBuilder sb = new StringBuilder();
	   
	   try
	   {
		   FileInputStream fis = new FileInputStream(input);
		   DataInputStream dis = new DataInputStream(fis);
		   BufferedReader br = new BufferedReader(new InputStreamReader(dis));
		   String line;
		   while ((line = br.readLine()) != null) {
			   sb.append(line);
		   }
		   dis.close();
	   } 
	   catch (Exception e) {
		   System.out.println("No file found");
		   //System.err.println("Error: " + e.getMessage());
	   }
	   
	   this.graph = sb;
   }