AlertCommand.java

package com.github.donotspampls.velocityutils.commands;

import com.velocitypowered.api.command.Command;
import com.velocitypowered.api.command.CommandSource;
import com.velocitypowered.api.proxy.Player;
import com.velocitypowered.api.proxy.ProxyServer;
import net.kyori.text.TextComponent;
import net.kyori.text.format.TextColor;
import net.kyori.text.serializer.ComponentSerializers;

import javax.annotation.Nonnull;

import java.util.Arrays;
import java.util.Collection;
import java.util.stream.Collectors;

public class AlertCommand implements Command {
    private final ProxyServer server;
    
    public AlertCommand(ProxyServer server) {
        this.server = server;
    }

    public void execute(@Nonnull CommandSource source, @Nonnull String[] args) {
        if (source.hasPermission("velocityutils.alert")) {
            if (args.length == 0) {
                source.sendMessage(TextComponent.builder("You must supply a message.").color(TextColor.RED).build());
            } else {
                String message = "&8[&4Alert&8] &r" + Arrays.stream(args).collect(Collectors.joining(" "));
                TextComponent component = ComponentSerializers.LEGACY.deserialize(message, '&');
                Collection<Player> players = server.getAllPlayers();
                for (Player p : players) {
                    p.sendMessage(component);
                }
            }
        } else {
            source.sendMessage(TextComponent.builder("You do not have permission to execute this command!").color(TextColor.RED).build());
        }
    }

}