Discord Bot to sync statuses to roles

config.txt

token=
guild_id=
streaming_id=
online_id=
idle_id=
dnd_id=

StatusRoleBot.java

/*
 * Copyright 2018 John Grosh (john.a.grosh@gmail.com).
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.jagrosh.statusrolebot;

import java.io.FileReader;
import java.util.Collections;
import java.util.LinkedList;
import java.util.List;
import java.util.Properties;
import net.dv8tion.jda.core.AccountType;
import net.dv8tion.jda.core.JDABuilder;
import net.dv8tion.jda.core.entities.Game;
import net.dv8tion.jda.core.entities.Guild;
import net.dv8tion.jda.core.entities.Member;
import net.dv8tion.jda.core.entities.Role;
import net.dv8tion.jda.core.events.Event;
import net.dv8tion.jda.core.events.ReadyEvent;
import net.dv8tion.jda.core.events.guild.member.GuildMemberJoinEvent;
import net.dv8tion.jda.core.events.user.UserGameUpdateEvent;
import net.dv8tion.jda.core.events.user.UserOnlineStatusUpdateEvent;
import net.dv8tion.jda.core.hooks.EventListener;

/**
 *
 * @author John Grosh (john.a.grosh@gmail.com)
 */
public class StatusRoleBot implements EventListener
{
    private final long guild;
    private final long[] statuses;
    
    private StatusRoleBot(long guild, long streaming, long online, long idle, long dnd)
    {
        this.guild = guild;
        this.statuses = new long[4];
        this.statuses[0] = streaming;
        this.statuses[1] = online;
        this.statuses[2] = idle;
        this.statuses[3] = dnd;
    }
    
    private long memberToStatus(Member m)
    {
        if(m.getGame()!=null && m.getGame().getType()==Game.GameType.STREAMING)
            return statuses[0];
        switch(m.getOnlineStatus())
        {
            case ONLINE: return statuses[1];
            case IDLE: return statuses[2];
            case DO_NOT_DISTURB: return statuses[3];
            default: return 0;
        }
    }
    
    @Override
    public void onEvent(Event event)
    {
        if(event instanceof UserOnlineStatusUpdateEvent)
            update(((UserOnlineStatusUpdateEvent)event).getMember());
        else if(event instanceof UserGameUpdateEvent)
            update(((UserGameUpdateEvent)event).getMember());
        else if(event instanceof GuildMemberJoinEvent)
            update(((GuildMemberJoinEvent)event).getMember());
        else if(event instanceof ReadyEvent)
        {
            Guild g = event.getJDA().getGuildById(guild);
            if(g!=null)
                g.getMembers().forEach(m -> update(m));
        }
    }
    
    private void update(Member member)
    {
        if(member.getGuild().getIdLong()!=guild)
            return;
        long should = memberToStatus(member);
        Role role = member.getGuild().getRoleById(should);
        boolean needsChange = role==null ? false : !member.getRoles().contains(role);
        List<Role> remList = new LinkedList<>();
        for(long se: statuses)
        {
            if(se==should)
                continue;
            Role sr = member.getGuild().getRoleById(se);
            if(sr!=null && member.getRoles().contains(sr))
            {
                needsChange = true;
                remList.add(sr);
            }
        }
        if(needsChange)
            member.getGuild().getController().modifyMemberRoles(member, role==null ? Collections.EMPTY_LIST : Collections.singleton(role), remList).queue();
    }
    
    public static void main(String[] args) throws Exception
    {
        Properties config = new Properties();
        config.load(new FileReader("config.txt"));
        new JDABuilder(AccountType.BOT)
                .setToken(config.getProperty("token"))
                .addEventListener(new StatusRoleBot(Long.parseLong(config.getProperty("guild_id")),
                        Long.parseLong(config.getProperty("streaming_id")),Long.parseLong(config.getProperty("online_id")),
                        Long.parseLong(config.getProperty("idle_id")),Long.parseLong(config.getProperty("dnd_id"))))
                .buildAsync();
    }
}