src/de/steamwar/lobby/LobbySystem.java

@@ -56,6 +56,7 @@ public class LobbySystem extends JavaPlugin {
         new ParticleListener();
         new InventoryInteraction();
         new WorldInteraction();
+        new PlayerSeatListener();
 
         new AlphaWall(l -> l.getX() > 1199, AlphaWall.REFLECT_X);
         new AlphaWall(l -> l.getX() < 2977, AlphaWall.REFLECT_X);

src/de/steamwar/lobby/listener/PlayerSeatListener.java

@@ -0,0 +1,110 @@
+package de.steamwar.lobby.listener;
+
+import org.bukkit.GameMode;
+import org.bukkit.Location;
+import org.bukkit.Material;
+import org.bukkit.block.data.Bisected;
+import org.bukkit.block.data.type.Stairs;
+import org.bukkit.entity.AbstractArrow;
+import org.bukkit.entity.Arrow;
+import org.bukkit.entity.EntityType;
+import org.bukkit.event.EventHandler;
+import org.bukkit.event.block.Action;
+import org.bukkit.event.player.PlayerInteractEvent;
+import org.bukkit.event.player.PlayerQuitEvent;
+import org.spigotmc.event.entity.EntityDismountEvent;
+
+import java.util.HashSet;
+import java.util.Objects;
+import java.util.Set;
+
+public class PlayerSeatListener extends BasicListener{
+
+    private static class SeatLocation {
+
+        private int x;
+        private int y;
+        private int z;
+
+        public SeatLocation(int x, int y, int z) {
+            this.x = x;
+            this.y = y;
+            this.z = z;
+        }
+
+        @Override
+        public boolean equals(Object o) {
+            if (this == o) return true;
+            if (!(o instanceof SeatLocation)) return false;
+            SeatLocation that = (SeatLocation) o;
+            return x == that.x &&
+                    y == that.y &&
+                    z == that.z;
+        }
+
+        @Override
+        public int hashCode() {
+            return Objects.hash(x, y, z);
+        }
+
+    }
+
+    private Set<SeatLocation> seats = new HashSet<>();
+
+    @EventHandler
+    public void onPlayerInteract(PlayerInteractEvent event) {
+        if (event.getAction() != Action.RIGHT_CLICK_BLOCK)
+            return;
+
+        if (!event.getClickedBlock().getType().name().toLowerCase().contains("stairs"))
+            return;
+
+        if (event.getPlayer().getGameMode() != GameMode.ADVENTURE && event.getPlayer().getGameMode() != GameMode.SURVIVAL)
+            return;
+
+        if (((Stairs) event.getClickedBlock().getBlockData()).getHalf() != Bisected.Half.BOTTOM)
+            return;
+
+        if (((Stairs) event.getClickedBlock().getBlockData()).getShape() != Stairs.Shape.STRAIGHT)
+            return;
+
+        if (event.getPlayer().isInsideVehicle())
+            event.getPlayer().getVehicle().remove();
+
+        if (event.getClickedBlock().getRelative(0, 1, 0).getType() != Material.AIR)
+            return;
+
+        Location location = event.getClickedBlock().getLocation();
+        SeatLocation seatLocation = getSeatLocation(location);
+        if (seats.contains(seatLocation))
+            return;
+        seats.add(seatLocation);
+
+        Arrow arrow = (Arrow) event.getPlayer().getWorld().spawnEntity(location.add(0.5, 0, 0.5), EntityType.ARROW);
+        arrow.setGravity(false);
+        arrow.setPickupStatus(AbstractArrow.PickupStatus.DISALLOWED);
+        arrow.addPassenger(event.getPlayer());
+        arrow.setPersistent(true);
+    }
+
+    @EventHandler
+    public void onEntityDismount(EntityDismountEvent event) {
+        seats.remove(getSeatLocation(event.getDismounted().getLocation()));
+
+        if (event.getEntityType() != EntityType.PLAYER)
+            return;
+
+        event.getDismounted().remove();
+    }
+
+    @EventHandler
+    public void onPlayerQuit(PlayerQuitEvent event) {
+        if (event.getPlayer().isInsideVehicle())
+            event.getPlayer().getVehicle().remove();
+    }
+
+    public SeatLocation getSeatLocation(Location location) {
+        return new SeatLocation(location.getBlockX(), location.getBlockY(), location.getBlockZ());
+    }
+
+}