Game Manager

package me.phantom64.teamdeathmatch.utils;

import java.util.ArrayList;
import java.util.List;

import me.phantom64.teamdeathmatch.TeamDeathMatch;
import me.phantom64.teamdeathmatch.utils.TeamManager.Team;

import org.bukkit.GameMode;
import org.bukkit.Material;
import org.bukkit.entity.Player;
import org.bukkit.inventory.ItemStack;
import org.bukkit.inventory.PlayerInventory;

public class GameManager {

    private TeamDeathMatch plugin;

    public List<Player> playing = new ArrayList<Player>();

    public List<Player> getPlaying() {
        return playing;
    }

    public GameManager(TeamDeathMatch plugin) {
        this.plugin = plugin;
    }

    public void addPlayerToGame(Player p) {
        getPlaying().add(p);
        TeamDeathMatch.addPlayersToTeamLists();
        Team team = TeamDeathMatch.getTeamManager().getValidTeam();
        p.setGameMode(GameMode.ADVENTURE);
        TeamDeathMatch.getLocationHandler().teleportPlayerToArena(p, team);
        TeamDeathMatch.getTeamManager().givePlayerKit(p, team);
    }

    public void removePlayerFromGame(Player p) {
        getPlaying().remove(p);
        TeamDeathMatch.getTeamManager().removeFromTeam(p, TeamDeathMatch.getTeamManager().getTeam(p));
        PlayerInventory inv = p.getInventory();
        inv.clear();
        inv.setHelmet(new ItemStack(Material.AIR, 1));
        inv.setChestplate(new ItemStack(Material.AIR, 1));
        inv.setLeggings(new ItemStack(Material.AIR, 1));
        inv.setBoots(new ItemStack(Material.AIR, 1));
        TeamDeathMatch.addPlayersToTeamLists();
        p.setGameMode(GameMode.SURVIVAL);
        TeamDeathMatch.getLocationHandler().teleportPlayerFromArena(p);
    }

    public boolean isPlaying(Player p) {
        return playing.contains(p);
    }

    public void broadcastMessageInGame(String message) {
        for (Player p : plugin.getServer().getOnlinePlayers()) {
            if (TeamDeathMatch.getGameManager().isPlaying(p)) {
                p.sendMessage(message);
            }
        }
    }

}