package com.malanak.commands;


import com.malanak.MyTestplugin;
import com.malanak.util.CommandBase;
import com.malanak.util.Msg;
import org.bukkit.command.CommandSender;
import org.bukkit.entity.Player;
import org.bukkit.permissions.PermissionAttachment;
import com.malanak.util.getExactPlayer;

import java.util.HashMap;
import java.util.UUID;

public class addPerms {
    public addPerms(MyTestplugin plugin) {
        new CommandBase("addperms", false) {
            @Override
            public boolean onCommand(CommandSender commandSender, String []  args){
                    Player targetplayer = getExactPlayer.getExactPlayer(args[0], commandSender);
                    String permission = args[1];
                if (targetplayer == null) {
                    Msg.send(commandSender, "Player does not exist", "&c");
                    return true;
                }
                    boolean value = true;
                    PermissionAttachment attachment = targetplayer.addAttachment(plugin);
                    HashMap<UUID, PermissionAttachment> uuidPermissionAttachmentHashMap;
                    attachment.setPermission(permission, value);
                    return true;
            }
            @Override
            public String getUsage() {
                return "/addperms player perms";
            }
        };
    }
}


the getExactPlayer source:

package com.malanak.util;

import org.bukkit.command.CommandSender;
import org.bukkit.entity.Player;

import static org.bukkit.Bukkit.getServer;

public class getExactPlayer {
    public static Player getExactPlayer(String playername, CommandSender commandSender) {
        Player player = getServer().getPlayer(playername);
        Player sender = (Player) commandSender;
        if(player.getName().equals(playername)) {
            return player;
        } else {
            return sender;
        }
    }
}