public void callRedstoneEvent(BlockRedstoneEvent event) {
    boolean on = event.getNewCurrent() > event.getOldCurrent();

    for (BlockFace direction :
        Arrays.asList(
            BlockFace.NORTH, BlockFace.EAST, BlockFace.SOUTH, BlockFace.WEST, BlockFace.UP)) {
      Block block = event.getBlock().getRelative(direction);
      if (SignUtil.isSign(block)) {
        Sign sign = SignUtil.getSign(block);
        List<SignMechanic> list =
            redstoneSignMechanicMap.get(SignUtil.getMechanicsIdentifier(sign));
        if (list == null) {
          list = new ArrayList<SignMechanic>();
        }
        if (redstoneSignMechanicMap.containsKey(null)) {
          list.addAll(redstoneSignMechanicMap.get(null));
        }
        for (SignMechanic mechanic : list) {
          try {
            BlockBagHandler bag = null;
            BlockMap map = null;
            if (mechanic.hasBlockMapper()) {
              map = mechanic.mapBlocks(sign);
            }
            if (mechanic.hasBlockBag()) {
              bag = BlockBagHandler.locate(sign);
            }
            SignMechanicEventData data = new SignMechanicEventData(map, bag);
            if (on) {
              mechanic.onSignPowerOn(data);
            } else {
              mechanic.onSignPowerOff(data);
            }
          } catch (BlockMapException e) {
            BetterMechanics.log(e.getMessage());
          } catch (BlockBagException e) {
            BetterMechanics.log(e.getMessage());
          }
        }
      } else {
        List<BlockMechanic> list = redstoneBlockMechanicMap.get(block.getType());
        if (list == null) {
          list = new ArrayList<BlockMechanic>();
        }
        if (blockMechanicMap.containsKey(null)) {
          list.addAll(blockMechanicMap.get(null));
        }
        for (BlockMechanic mechanic : list) {
          if (on) {
            mechanic.onBlockPowerOn(event.getBlock());
          } else {
            mechanic.onBlockPowerOff(event.getBlock());
          }
        }
      }
    }
  }