Notifier.java

package ru.denull.wire.model;

import java.util.concurrent.Callable;

public class Notifier {
  // CONSTANTS FOR EVENTS (project-dependent)
  // 0..9 - MainActivity/global UI related events
  public static final long MAIN_ACTIVITY_CREATED 									= (1L << 0);
  public static final long MAIN_ACTIVITY_STARTED 									= (1L << 1);
  public static final long MAIN_ACTIVITY_RESUMED 									= (1L << 2);
  public static final long DATA_SERVICE_CONNECTED									= (1L << 3);

  // 10..19 - DataService/global data related events
  public static final long DATA_SERVICE_CREATED 									= (1L << 10);
  public static final long CACHING_DB_STARTED											= (1L << 11);
  public static final long MAIN_SERVER_CONNECTED									= (1L << 12);
  public static final long MAIN_SERVER_AUTH_KEY										= (1L << 13);
  public static final long AUTHORIZED															= (1L << 14);

  // 20..39 - Fragments/local UI events
  public static final long LOGIN_PHONE_FRAGMENT_STARTED 					= (1L << 20);

  // 40..59 - Loading/local data events

  // CONSTANTS FOR EVENTS END

  // 60..63 - flags
  // CALL_EACH_TIME: if set, callback is not removed after the first visit to the state 
  public static final long CALL_EACH_TIME													= (1L << 60);
  // MULTIPLE: callback is called even if we are already in matching state
  public static final long MULTIPLE 															= (1L << 61);
  // NOT_NOW: callback is not called straight away if we are already in matching state
  public static final long NOT_NOW																= (1L << 62);

  public static long state = 0;

  public interface NotifierCallback {}
  public interface NotifierAfterCallback extends NotifierCallback {
    public void afterEvent(long state, long entered, long left, long events, long tag);
  }

  // TODO: add "before()"?
  // TODO: guarantee that callback will always be called in the same order they were set 
  // returns true if instantly called (never returns true if flag NOT_NOW is set)
  public static boolean after(long events, Runnable callback) {

    return false;
  }
  // callback receives current state as param
  public static boolean after(long events, Callable<Integer> callback) {

    return false;
  }
  public static boolean callback(long events, NotifierCallback callback, long tag) {

    return false;
  }

  public static void enter(long state) {

  }

  public static void leave(long state) {

  }
}