BossMessage

[Howaner]

I use this code in bukkit:

package de.howaner.OITC.util;
 
import de.howaner.OITC.OITCPlugin;
import java.lang.reflect.Field;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import net.minecraft.server.v1_7_R3.DataWatcher;
import net.minecraft.server.v1_7_R3.EntityPlayer;
import net.minecraft.server.v1_7_R3.EnumClientCommand;
import net.minecraft.server.v1_7_R3.Packet;
import net.minecraft.server.v1_7_R3.PacketPlayInClientCommand;
import net.minecraft.server.v1_7_R3.PacketPlayOutEntityDestroy;
import net.minecraft.server.v1_7_R3.PacketPlayOutEntityMetadata;
import net.minecraft.server.v1_7_R3.PacketPlayOutEntityTeleport;
import net.minecraft.server.v1_7_R3.PacketPlayOutSpawnEntityLiving;
import org.bukkit.Bukkit;
 
import org.bukkit.Location;
import org.bukkit.craftbukkit.v1_7_R3.entity.CraftPlayer;
import org.bukkit.entity.EntityType;
import org.bukkit.entity.Player;
 
public class StatusBar {
	public static final int ENTITY_ID = 1234;
	public static List<String> hasHealthBar = new ArrayList<String>();
	public static Map<String, Integer> schedulers = new HashMap<String, Integer>();
	
	/* Set Variable with Reflections */
	public static void setVar(String key, Object value, Object c) {
		try {
			Field f = c.getClass().getDeclaredField(key);
			f.setAccessible(true);
			f.set(c, value);
		} catch (Exception e) {
			e.printStackTrace();
		}
	}
	
	public static void sendPacket(Player player, Packet packet) {
		EntityPlayer entityPlayer = ((CraftPlayer) player).getHandle();
		
		entityPlayer.playerConnection.sendPacket(packet);
	}
	
	//Accessing packets
	public static PacketPlayOutSpawnEntityLiving getMobPacket(String text, Location loc, int health) {
		PacketPlayOutSpawnEntityLiving mobPacket = new PacketPlayOutSpawnEntityLiving();
		
		setVar("a", (int) ENTITY_ID, mobPacket);
		setVar("b", (byte) EntityType.ENDER_DRAGON.getTypeId(), mobPacket);
		setVar("c", (int) Math.floor(loc.getBlockX() * 32.0D), mobPacket);
		setVar("d", (int) Math.floor(loc.getBlockY() * 32.0D), mobPacket);
		setVar("e", (int) Math.floor(loc.getBlockZ() * 32.0D), mobPacket);
		setVar("f", (int) 0, mobPacket);
		setVar("g", (byte) 0, mobPacket);
		setVar("h", (byte) 0, mobPacket);
		setVar("i", (byte) 0, mobPacket);
		setVar("j", (byte) 0, mobPacket);
		setVar("k", (byte) 0, mobPacket);
		setVar("l", getWatcher(text, health), mobPacket);
		
		return mobPacket;
	}
	
	public static PacketPlayOutEntityDestroy getDestroyEntityPacket() {
		PacketPlayOutEntityDestroy packet = new PacketPlayOutEntityDestroy();
		
		setVar("a", new int[]{ENTITY_ID}, packet);
		
		return packet;
	}
	
	public static PacketPlayOutEntityMetadata getMetadataPacket(DataWatcher watcher) {
		PacketPlayOutEntityMetadata metaPacket = new PacketPlayOutEntityMetadata();
		
		setVar("a", (int) ENTITY_ID, metaPacket);
		setVar("b", watcher.c(), metaPacket);
		
		return metaPacket;
	}
	
	public static PacketPlayOutEntityTeleport getTeleportPacket(Location loc) {
		PacketPlayOutEntityTeleport packet = new PacketPlayOutEntityTeleport();
		
		setVar("a", (int) ENTITY_ID, packet);
		setVar("b", (int) Math.floor(loc.getX() * 32.0D), packet);
		setVar("c", (int) Math.floor(loc.getY() * 32.0D), packet);
		setVar("d", (int) Math.floor(loc.getZ() * 32.0D), packet);
		setVar("e", (byte) ((int) (loc.getYaw() * 256.0F / 360.F)), packet);
		setVar("f", (byte) ((int) (loc.getPitch() * 256.0F / 360.0F)), packet);
		
        return packet;
    }
	
	public static PacketPlayInClientCommand getRespawnPacket() {
		PacketPlayInClientCommand packet = new PacketPlayInClientCommand();
		
		setVar("a", EnumClientCommand.PERFORM_RESPAWN, packet);
		
		return packet;
	}
	
	public static DataWatcher getWatcher(String text, int health) {
		DataWatcher watcher = new DataWatcher(null);
		
		watcher.a(0, (Byte) (byte) 0x20); //Flags, 0x20 = invisible
		watcher.a(6, (Float) (float) health);
		watcher.a(10, (String) text); //Entity name
		watcher.a(11, (Byte) (byte) 1); //Show name, 1 = show, 0 = don't show
		watcher.a(16, (Integer) (int) health); //Wither health, 300 = full health
		
		return watcher;
	}
	
	public static void displayTextBar(String text, final Player player) {
		displayTextBar(text, player, 200, -1);
	}
	
	public static void displayTextBar(String text, final Player player, int health, int time) {
		if (hasHealthBar.contains(player.getName())) {
			if (schedulers.containsKey(player.getName()))
				Bukkit.getScheduler().cancelTask(schedulers.get(player.getName()));
			schedulers.remove(player.getName());
			sendPacket(player, getMetadataPacket(getWatcher(text, health)));
			
			if (time != -1) {
				schedulers.put(player.getName(), Bukkit.getScheduler().scheduleSyncDelayedTask(OITCPlugin.getPlugin(), new Runnable() {
					@Override
					public void run(){
						PacketPlayOutEntityDestroy destroyEntityPacket = getDestroyEntityPacket();
						sendPacket(player, destroyEntityPacket);
						hasHealthBar.remove(player.getName());
						schedulers.remove(player.getName());
					}
				}, 20L * time));
			}
			
			return;
		}
		PacketPlayOutSpawnEntityLiving mobPacket = getMobPacket(text, player.getLocation().clone().add(0, -200, 0), health);
		
		sendPacket(player, mobPacket);
		hasHealthBar.add(player.getName());
		
		if (time != -1) {
			schedulers.put(player.getName(), Bukkit.getScheduler().scheduleSyncDelayedTask(OITCPlugin.getPlugin(), new Runnable() {
				@Override
				public void run(){
					PacketPlayOutEntityDestroy destroyEntityPacket = getDestroyEntityPacket();
					sendPacket(player, destroyEntityPacket);
					hasHealthBar.remove(player.getName());
					schedulers.remove(player.getName());
				}
			}, 20L * time));
		}
	}
	
}