public boolean deleteFile(){
  if (filterInfo == null)   return false;
  String fileName=getRootDir() + getUrlPath(filterInfo.paramURL);
  File f=new File(fileName);
  return f.delete();
}

public boolean deleteFile ( ) { if ( filterInfo == null ) return false ; String fileName = getRootDir ( ) + getUrlPath ( filterInfo . paramURL ) ; File f = new File ( fileName ) ; return f . delete ( ) ; }
deletes the file if exists on the local file - system .
