public GraphViz() {
	   String system = System.getProperty("os.name").toLowerCase();
	   if(system.contains("lin")) {
		   TEMP_DIR = TEMP_DIR_LINUX;
		   DOT = DOT_LINUX;
	   } else if (system.contains("mac")) {
		   TEMP_DIR = TEMP_DIR_MAC;
		   DOT = DOT_MAC;
	   } else if(system.contains("windows")) {
		   TEMP_DIR = TEMP_DIR_WINDOWS;
		   DOT = DOT_WINDOWS;
	   } else {
		   System.out.println("No supported system. \nGraphViz is only supported for Linux, Mac, Windows!");
	   }
		   
   }