Bukkit class to Easily change and modify a player's nametag prefix & suffix via NMS

NametagEdit.java

package com.shawckz.random;

import net.minecraft.server.v1_8_R1.PacketPlayOutScoreboardTeam;
import org.bukkit.Bukkit;
import org.bukkit.craftbukkit.v1_8_R1.entity.CraftPlayer;
import org.bukkit.entity.Player;

import java.lang.reflect.Field;
import java.util.Collection;

/**
 * @author Shawckz
 * http://shawckz.com
 */
public class NametagEdit {

    /*

    a = (String)name
    b = (String)displayname
    c = (String)prefix
    d = (String)suffix
    e = (Enum)EnumTagVisibility
    f = (int)EnumChatColor id
    h = (int)join/quit/ (0 or 2)
    i = (int)whether to allow friendly fire / packetdata
     */

    private PacketPlayOutScoreboardTeam packet;

    public static enum NameTagColor {

        BLACK("BLACK", '0', 0),
        DARK_BLUE("DARK_BLUE", '1', 1),
        DARK_GREEN("DARK_GREEN", '2', 2),
        DARK_AQUA("DARK_AQUA", '3', 3),
        DARK_RED("DARK_RED", '4', 4),
        DARK_PURPLE("DARK_PURPLE", '5', 5),
        GOLD("GOLD", '6', 6),
        GRAY("GRAY", '7', 7),
        DARK_GRAY("DARK_GRAY", '8', 8),
        BLUE("BLUE", '9', 9),
        GREEN("GREEN", 'a', 10),
        AQUA("AQUA", 'b', 11),
        RED("RED", 'c', 12),
        LIGHT_PURPLE("LIGHT_PURPLE", 'd', 13),
        YELLOW("YELLOW", 'e', 14),
        WHITE("WHITE", 'f', 15),
        RESET("RESET", 'r', -1);

        private final String name;
        private final char c;
        private final int id;

        NameTagColor(String name, char c, int id){
            this.name = name;
            this.c = c;
            this.id = id;
        }

        public String getName() {
            return name;
        }

        public char getChar() {
            return c;
        }

        public int getId() {
            return id;
        }
    }

    /**
     * Construct what color you want the player's name tag to be, as well as team name and team display name (which aren't very important)
     * @param teamName
     * @param displayName
     * @param color
     */
    public NametagEdit(String teamName,String displayName,NameTagColor color){
        packet = new PacketPlayOutScoreboardTeam();
        setField("a",teamName);
        setField("b",displayName);
        setField("c","§"+color.getChar());
        setField("d","");
        setField("e","always");
        setField("f",color.getId());
        setField("h",0);
        setField("i",1);

    }

    /**
     * Construct the team name, display name, prefix and suffix of that player's name tag (prefix and suffix will appear on player's name tag and in tab list)
     * @param teamName
     * @param displayName
     * @param prefix
     * @param suffix
     */
    public NametagEdit(String teamName,String displayName,String prefix, String suffix){
        packet = new PacketPlayOutScoreboardTeam();
        setField("h",0);
        setField("b",displayName);
        setField("a",teamName);
        setField("c",prefix);
        setField("d",suffix);
        setField("e","always");
        setField("i",1);
    }

    /**
     * Construct the team name, display name and prefix (prefix will appear on player's name tag and in the tab list)
     * @param teamName
     * @param displayName
     * @param prefix
     */
    public NametagEdit(String teamName,String displayName,String prefix){
        packet = new PacketPlayOutScoreboardTeam();
        setField("h",0);
        setField("b",displayName);
        setField("a",teamName);
        setField("c",prefix);
        setField("e","always");
        setField("i",1);
    }

    /**
     * Add a player to the team, you must add the player to the team if you wish their name to get colored/to get their prefix set
     * @param pl
     */
    public void addPlayer(Player pl){
        try {
            add(pl);
        }
        catch(Exception ex){
            ex.printStackTrace();
            pl.sendMessage("Failed to add you to team");
        }
    }

    /**
     * Send it to a specific player
     * @param pl
     */
    public void sendToPlayer(Player pl){
        try {
            ((CraftPlayer) pl).getHandle().playerConnection.sendPacket(packet);
        }
        catch(Exception ex){
            ex.printStackTrace();
            pl.sendMessage("Failed to send packet");
        }
    }

    /**
     * Send it to all players, only players who have been added to the team will get their name changed.
     */
    public void updateAll(){
        for(Player pl : Bukkit.getOnlinePlayers()){
            sendToPlayer(pl);
        }
    }

    private void setField(String field, Object value) {
        try {
            Field f = packet.getClass().getDeclaredField(field);
            f.setAccessible(true);
            f.set(packet, value);
            f.setAccessible(false);
        } catch (Exception ex) {
            ex.printStackTrace();
        }
    }

    private void add(Player pl) throws NoSuchFieldException, IllegalAccessException{
        Field f = packet.getClass().getDeclaredField("g");
        f.setAccessible(true);
        ((Collection) f.get(packet)).add(pl.getName());
    }


}