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public Interface Ticket {

  /**
   * Get a String uniquely identifying this Ticket within this instance of CAS Server.
   * The id must contain a substring that is drawn uniformly at random from a large space --
   * this is vital to the security of a CAS implementation.
   */
  public String getId();

  /**
   * Get the GrantingTicket from which this Ticket was generated.
   * Returns null in the case where this Ticket was not created from a GrantingTicket.
   */
  public GrantingTicket getGrantor();


  /**
   * Get the Date at which this Ticket was created.
   * It is not expected that ticket consumers will use this method to themselves calculate 
   * expiry.  Rather, timestamp of creation is an attribute of tickets, made available for such purposes
   * as logging, verification that expiry is behaving properly, etc.
   */ 
  public Date getTimestamp();

  /**
   * Is this ticket expired?
   */
  public boolean isExpired(); 

}