@Override
public void onEvent(@Nonnull GenericEvent event) {
    if (event instanceof GuildMemberJoinEvent) {
        this.onGuildMemberJoin((GuildMemberJoinEvent) event);
    } else if (event instanceof GuildMemberRemoveEvent) {
        this.onGuildMemberRemove((GuildMemberRemoveEvent) event);
    } else if (event instanceof GuildMemberRoleRemoveEvent) {
        this.onGuildMemberRoleRemove((GuildMemberRoleRemoveEvent) event);
    } else if (event instanceof GuildMemberRoleAddEvent) {
        this.onGuildMemberRoleAdd((GuildMemberRoleAddEvent) event);
    }
}
 

private void onGuildMemberRemove(GuildMemberRemoveEvent event) {
    final Guild guild = event.getGuild();
    final User user = event.getUser();
    final SelfUser selfUser = event.getJDA().getSelfUser();

    // If we are leaving we need to ignore this as we cannot send messages to any channels
    // when this event is fired
    if (user.equals(selfUser)) {
        return;
    }

    final GuildSettings settings = GuildSettingsUtils.getGuild(guild, variables);

    // If the leave message is enabled and we have a welcome channel
    if (settings.isEnableJoinMessage() && settings.getWelcomeLeaveChannel() > 0) {
        final long welcomeLeaveChannelId = settings.getWelcomeLeaveChannel();

        final TextChannel welcomeLeaveChannel = guild.getTextChannelById(welcomeLeaveChannelId);
        final String msg = parseGuildVars(settings.getCustomLeaveMessage(), event);

        // If we have a message and the text channel is not null
        if (!msg.isEmpty() && !"".equals(msg.trim()) && welcomeLeaveChannel != null) {
            sendMsg(welcomeLeaveChannel, msg);
        }
    }

    if (guild.getIdLong() == Settings.SUPPORT_GUILD_ID) {
        handlePatronRemoval(user.getIdLong());
    }
}
 

@Nonnull
private String parseGuildVars(String rawMessage, GenericGuildEvent event) {

    if (!(event instanceof GuildMemberJoinEvent) && !(event instanceof GuildMemberRemoveEvent)) {
        return "This code should never run";
    }

    if (rawMessage == null || "".equals(rawMessage.trim())) {
        return "";
    }

    final User user;

    if (event instanceof GuildMemberJoinEvent) {
        user = ((GuildMemberJoinEvent) event).getUser();
    } else {
        user = ((GuildMemberRemoveEvent) event).getUser();
    }

    final Guild guild = event.getGuild();
    final GuildSettings s = GuildSettingsUtils.getGuild(guild, variables);
    final long welcomeLeaveChannel = s.getWelcomeLeaveChannel();
    final Parser parser = CommandUtils.PARSER_SUPPLIER.get();

    final String message = parser.put("user", user)
        .put("guild", event.getGuild())
        .put("channel", event.getGuild().getTextChannelById(welcomeLeaveChannel))
        .put("args", "")
        .parse(rawMessage);

    parser.clear();

    return message;
}