To replace all the path string the file provided the pathstart identifier

To replace all the path string the file provided the pathstart identifier

private static void changePathInsideFile(String dataPath,
  String sFILEPATHFOPXCONF,String pathStartIdentifier) {

 String fileName=sFILEPATHFOPXCONF;
 boolean changed=false;
 try
 {
  File file = new File(fileName);
  BufferedReader reader = new BufferedReader(new FileReader(file));
  String line = "", oldtext = "";
  String c="";
  String d="";
  String e="";
  String baseFolder="Data/";
  int index;
  while((line = reader.readLine()) != null)
  {
   index=line.indexOf(baseFolder);
   while(index>0){// 
    //get substring till the text
    c=line.substring(0,index);
    //substring till the pathstartidentifier
    d=c.substring(0, c.lastIndexOf(pathStartIdentifier)+1);
    //substring after the index
    e=line.substring(index, line.length());             

    line=d+dataPath+e;
    changed=true;
    index=line.indexOf(baseFolder, index+1);
   }
   oldtext += line + "\r\n";                 
  }
  reader.close();
  //writing the file
  if(changed){
   FileWriter writer = new FileWriter(fileName);
   writer.write(oldtext);writer.close();
  }
 }
 catch (IOException ioe)
 {
  ioe.printStackTrace();
 }
}