Talk to BungeeCord easily!

BungeeTalk.java

import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;

import org.bukkit.Bukkit;
import org.bukkit.entity.Player;
import org.bukkit.plugin.java.JavaPlugin;
import org.bukkit.plugin.messaging.PluginMessageListener;

import com.google.common.collect.Iterables;
import com.google.common.io.ByteArrayDataInput;
import com.google.common.io.ByteArrayDataOutput;
import com.google.common.io.ByteStreams;

public class BungeeTalk implements PluginMessageListener {
    
    private Map<String, String> responses;
    
    private JavaPlugin plugin;

    public BungeeTalk(JavaPlugin plugin) {
        this.plugin = plugin;
        responses = new ConcurrentHashMap<String, String>();
        Bukkit.getServer().getMessenger().registerOutgoingPluginChannel(plugin, "BungeeCord");
        Bukkit.getServer().getMessenger().registerIncomingPluginChannel(plugin, "BungeeCord", this);
    }
    
    public void ask(Player p, String channel, String... messages) {
        ByteArrayDataOutput out = ByteStreams.newDataOutput();
        for(String s : messages) out.writeUTF(s);
        p.sendPluginMessage(plugin, channel, out.toByteArray());
    }
    
    public void ask(String channel, String... messages) {
        Player p = Iterables.getFirst(Bukkit.getOnlinePlayers(), null);
        if(p == null) return;
        ask(p, channel, messages);
    }
    
    public void ask(String... messages) {
        ask("BungeeCord", messages);
    }

    @Override
    public void onPluginMessageReceived(String channel, Player player, byte[] message) {
      if (!channel.equals("BungeeCord"))
        return;
      ByteArrayDataInput in = ByteStreams.newDataInput(message);
      String subchannel = in.readUTF();
      String msg = in.readUTF();
      if(responses.containsKey(subchannel)) responses.remove(subchannel);
      responses.put(subchannel, msg);
    }
    
    public Map<String, String> getResponses() {
        return responses;
    }
    
    public String getResponse(String key) {
        if(!responses.containsKey(key)) return null;
        return responses.get(key);
    }
    
}