src/main/java/net/glowstone/EventFactory.java

package net.glowstone;

import net.glowstone.block.GlowBlock;
import net.glowstone.block.ItemTable;
import net.glowstone.block.blocktype.BlockType;
import net.glowstone.entity.GlowPlayer;
import net.glowstone.net.GlowSession;
import org.bukkit.BanList;
import org.bukkit.Bukkit;
import org.bukkit.ChatColor;
import org.bukkit.Location;
import org.bukkit.block.Block;
import org.bukkit.block.BlockFace;
import org.bukkit.block.BlockState;
import org.bukkit.command.ConsoleCommandSender;
import org.bukkit.entity.Player;
import org.bukkit.event.Event;
import org.bukkit.event.block.*;
import org.bukkit.event.player.*;
import org.bukkit.event.player.PlayerTeleportEvent.TeleportCause;
import org.bukkit.event.server.ServerCommandEvent;
import org.bukkit.event.server.ServerListPingEvent;
import org.bukkit.event.world.*;
import org.bukkit.inventory.ItemStack;

import java.net.InetAddress;
import java.util.Collection;
import java.util.concurrent.CancellationException;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.FutureTask;
import java.util.logging.Level;

/**
 * Central class for the calling of events.
 */
public final class EventFactory {

    // Private to prevent creation
    private EventFactory() {}

    /**
     * Calls an event through the plugin manager.
     * @param event The event to throw.
     * @return the called event
     */
    private static <T extends Event> T callEvent(final T event) {
        final GlowServer server = (GlowServer) Bukkit.getServer();

        if (event.isAsynchronous()) {
            server.getPluginManager().callEvent(event);
            return event;
        } else {
            FutureTask<T> task = new FutureTask<>(new Runnable() {
                @Override
                public void run() {
                    server.getPluginManager().callEvent(event);
                }
            }, event);
            server.getScheduler().scheduleInTickExecution(task);
            try {
                return task.get();
            } catch (InterruptedException e) {
                GlowServer.logger.log(Level.WARNING, "Interrupted while handling " + event.getClass().getSimpleName());
                return event;
            } catch (CancellationException e) {
                GlowServer.logger.log(Level.WARNING, "Not handling event " + event.getClass().getSimpleName() + " due to shutdown");
                return event;
            } catch (ExecutionException e) {
                throw new RuntimeException(e); // No checked exceptions declared for callEvent
            }
        }
    }


    // -- Player Events

    public static PlayerChatEvent onPlayerChat(Player player, String message) {
        return callEvent(new PlayerChatEvent(player, message));
    }

    public static PlayerCommandPreprocessEvent onPlayerCommand(Player player, String message) {
        return callEvent(new PlayerCommandPreprocessEvent(player, message));
    }

    public static PlayerJoinEvent onPlayerJoin(Player player) {
        return callEvent(new PlayerJoinEvent(player, ChatColor.YELLOW + player.getName() + " joined the game"));
    }

    public static PlayerKickEvent onPlayerKick(Player player, String reason) {
        return callEvent(new PlayerKickEvent(player, reason, null));
    }

    public static PlayerQuitEvent onPlayerQuit(Player player) {
        return callEvent(new PlayerQuitEvent(player, ChatColor.YELLOW + player.getName() + " left the game"));
    }

    public static PlayerMoveEvent onPlayerMove(Player player, Location from, Location to) {
        if (PlayerMoveEvent.getHandlerList().getRegisteredListeners().length > 0) {
            return callEvent(new PlayerMoveEvent(player, from, to));
        } else {
            return null;
        }
    }

    public static PlayerInteractEvent onPlayerInteract(Player player, Action action) {
        return callEvent(new PlayerInteractEvent(player, action, player.getItemInHand(), null, null));
    }

    public static PlayerInteractEvent onPlayerInteract(Player player, Action action, Block clicked, BlockFace face) {
        return callEvent(new PlayerInteractEvent(player, action, player.getItemInHand(), clicked, face));
    }

    public static PlayerTeleportEvent onPlayerTeleport(Player player, Location from, Location to, TeleportCause cause) {
        return callEvent(new PlayerTeleportEvent(player, from, to, cause));
    }

    public static PlayerLoginEvent onPlayerLogin(GlowPlayer player) {
        final GlowServer server = player.getServer();
        final String address = player.getAddress().getAddress().getHostAddress();
        final PlayerLoginEvent event = new PlayerLoginEvent(player);

        final BanList nameBans = server.getBanList(BanList.Type.NAME);
        final BanList ipBans = server.getBanList(BanList.Type.IP);

        if (nameBans.isBanned(player.getName())) {
            event.disallow(PlayerLoginEvent.Result.KICK_BANNED, "Banned: " + nameBans.getBanEntry(player.getName()).getReason());
        } else if (ipBans.isBanned(address)) {
            event.disallow(PlayerLoginEvent.Result.KICK_BANNED, "Banned: " + ipBans.getBanEntry(address).getReason());
        } else if (server.hasWhitelist() && server.getWhitelist().contains(player.getName())) {
            event.disallow(PlayerLoginEvent.Result.KICK_WHITELIST, "You are not whitelisted on this server");
        } else if (server.getOnlinePlayers().length >= server.getMaxPlayers()) {
            event.disallow(PlayerLoginEvent.Result.KICK_FULL,
                    "The server is full (" + player.getServer().getMaxPlayers() + " players).");
        }

        return callEvent(event);
    }

    public static PlayerPreLoginEvent onPlayerPreLogin(String name, GlowSession session) {
        return callEvent(new PlayerPreLoginEvent(name, session.getAddress().getAddress()));
    }

    public static PlayerChangedWorldEvent onPlayerChangedWorld(GlowPlayer player, GlowWorld fromWorld) {
        return callEvent(new PlayerChangedWorldEvent(player, fromWorld));
    }

    public static PlayerAnimationEvent onPlayerAnimate(GlowPlayer player) {
        return callEvent(new PlayerAnimationEvent(player));
    }

    public static PlayerChatTabCompleteEvent onPlayerTabComplete(Player who, String message, Collection<String> completions) {
        return callEvent(new PlayerChatTabCompleteEvent(who, message, completions));
    }

    // -- Block Events

    public static PlayerToggleSneakEvent onPlayerToggleSneak(Player player, boolean isSneaking) {
        return callEvent(new PlayerToggleSneakEvent(player, isSneaking));
    }

    public static BlockBreakEvent onBlockBreak(Block block, Player player) {
        return callEvent(new BlockBreakEvent(block, player));
    }

    public static BlockDamageEvent onBlockDamage(Player player, Block block) {
        return onBlockDamage(player, block, player.getItemInHand(), false);
    }

    public static BlockDamageEvent onBlockDamage(Player player, Block block, ItemStack tool, boolean instaBreak) {
        return callEvent(new BlockDamageEvent(player, block, tool, instaBreak));
    }

    public static BlockPlaceEvent onBlockPlace(Block block, BlockState newState, Block against, Player player) {
        return callEvent(new BlockPlaceEvent(block, newState, against, player.getItemInHand(), player, true));
    }

    public static BlockPhysicsEvent onBlockPhysics(GlowBlock block) {
        return callEvent(new BlockPhysicsEvent(block, block.getTypeId()));
    }

    public static BlockPhysicsEvent onBlockPhysics(GlowBlock block, int changedType) {
        return callEvent(new BlockPhysicsEvent(block, changedType));
    }

    public static BlockCanBuildEvent onBlockCanBuild(GlowBlock block, int newId, BlockFace against) {
        BlockType type = ItemTable.instance().getBlock(newId);
        boolean canBuild = type == null || type.canPlaceAt(block, against);
        return callEvent(new BlockCanBuildEvent(block, newId, canBuild));
    }

    // -- Server Events

    public static ServerListPingEvent onServerListPing(InetAddress address, String message, int online, int max) {
        return callEvent(new ServerListPingEvent(address, message, online, max));
    }

    public static ServerCommandEvent onServerCommand(ConsoleCommandSender sender, String command) {
        return callEvent(new ServerCommandEvent(sender, command));
    }

    // -- World Events

    public static ChunkLoadEvent onChunkLoad(GlowChunk chunk, boolean isNew) {
        return callEvent(new ChunkLoadEvent(chunk, isNew));
    }

    public static ChunkPopulateEvent onChunkPopulate(GlowChunk populatedChunk) {
        return callEvent(new ChunkPopulateEvent(populatedChunk));
    }

    public static ChunkUnloadEvent onChunkUnload(GlowChunk chunk) {
        return callEvent(new ChunkUnloadEvent(chunk));
    }

    public static SpawnChangeEvent onSpawnChange(GlowWorld world, Location previousLocation) {
        return callEvent(new SpawnChangeEvent(world, previousLocation));
    }

    public static WorldInitEvent onWorldInit(GlowWorld world) {
        return callEvent(new WorldInitEvent(world));
    }

    public static WorldLoadEvent onWorldLoad(GlowWorld world) {
        return callEvent(new WorldLoadEvent(world));
    }

    public static WorldSaveEvent onWorldSave(GlowWorld world) {
        return callEvent(new WorldSaveEvent(world));
    }

    public static WorldUnloadEvent onWorldUnload(GlowWorld world) {
        return callEvent(new WorldUnloadEvent(world));
    }
}