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public class PartitionWindowedStream<T> {

    /**
     * Sorts the records of the window on the specified field in the specified order. The type of
     * records must be atomic. An atomic type is a type that is treated as one indivisible unit and
     * can act as a key. Example atomic types are the basic types (int, long, String, ...) and
     * comparable custom classes.
     *
     * @param order The order in which records is sorted.
     * @return The resulting data stream with sorted records in each subtask.
     */
    DataStream<T> sortPartition(Order order);


    /**
     * Sorts the records of the window on the specified field in the 
     * specified order. The type of records must be {@link Tuple}.
     *
     * @param field The field index on which records is sorted.
     * @param order The order in which records is sorted.
     * @return The resulting data stream with sorted records in each subtask.
     */
    public DataStream<T> sortPartition(int field, Order order) {
      ...
    }

    /**
     * Sorts the records of the window on the specified field in the 
     * specified order. The type of records must be {@link Tuple} or POJO 
     * class. The POJO class must be public and have getter and setter methods 
     * for each field. It mustn't implement any interfaces or extend any 
     * classes.
     * 
     * @param field The field expression referring to the field on which 
     * records is sorted.
     * @param order The order in which records is sorted.
     * @return The resulting data stream with sorted records in each subtask.
     */
    public DataStream<T> sortPartition(String field, Order order) {
      ...
    }

    /**
     * Sorts the records of the window on the extracted key in the specified order.
     *
     * @param keySelector The KeySelector function which extracts the key 
     * from records.
     * @param order The order in which records is sorted.
     * @return The resulting data stream with sorted records in each subtask.
     */
    public <K> DataStream<T> sortPartition(KeySelector<T, K> keySelector, Order order) {
      ...
    }
  
}