public static Map<String,MappedClass> mappingsFromJar(File file){
  Map<String,ClassNode> nodes=null;
  try {
    nodes=JarUtils.loadClasses(file);
  }
 catch (  IOException e) {
    e.printStackTrace();
  }
  return mappingsFromNodes(nodes);
}

public static Map < String , MappedClass > mappingsFromJar ( File file ) { Map < String , ClassNode > nodes = null ; try { nodes = JarUtils . loadClasses ( file ) ; } catch ( IOException e ) { e . printStackTrace ( ) ; } return mappingsFromNodes ( nodes ) ; }
returns a map of class names to mapped classes given a jar file .
