/** called by above methods to clean out original locations list periodically */
  protected void pruneOriginalLocations() {
    long maxTime =
        SimpleSpleef.getPlugin().getConfig().getInt("keepOriginalLocationsSeconds", 3600);
    if (maxTime < 0) return; // should not happen...
    long checkTime = (System.currentTimeMillis() / 1000) - maxTime;

    // delete entries that are too old
    for (Entry<String, PlayerOriginalLocation> entry : playerOriginalLocations.entrySet()) {
      if (entry.getValue().timestamp < checkTime) // remove entries that
        // are too old
        playerOriginalLocations.remove(entry.getKey());
    }
  }
  /**
   * save original position of player - possibly, because it is possible that there is an original
   * position saved already
   *
   * @param player
   */
  public void keepPosition(Player player) {
    long maxTime =
        SimpleSpleef.getPlugin().getConfig().getInt("keepOriginalLocationsSeconds", 3600);
    if (maxTime < 0) return; // should not happen...

    // prune first
    pruneOriginalLocations();
    String playerName = player.getName();
    // already in list? => delete old etry
    if (playerOriginalLocations.containsKey(playerName)) updateOriginalLocationTimestamp(player);
    // add position
    else {
      PlayerOriginalLocation loc = new PlayerOriginalLocation();
      loc.timestamp = System.currentTimeMillis() / 1000;
      loc.location = player.getLocation().clone();

      playerOriginalLocations.put(player.getName(), loc);
    }
  }