IP-Check Scan Command

package net.risenphoenix.jnk.ipcheck.commands;

import java.util.ArrayList;
import net.risenphoenix.jnk.ipcheck.IPcheck;
import net.risenphoenix.jnk.ipcheck.Objects.IPObject;
import net.risenphoenix.jnk.ipcheck.Objects.UserObject;
import org.bukkit.Bukkit;
import org.bukkit.ChatColor;
import org.bukkit.command.CommandSender;
import org.bukkit.entity.Player;
import org.bukkit.permissions.Permission;

public class CmdScan extends IpcCommand {

    @Override
    public void execute(CommandSender sender, String commandLabel, String[] args) {
        // Fetch online players and create a place to hold detected players
        if (sender.hasPermission("ipcheck.scan") || sender.isOp()) {
            Player[] online = Bukkit.getOnlinePlayers();
            ArrayList<Player> detected = new ArrayList<Player>();

            // Iterate through the players
            for (int i = 0; i < online.length; i++) {
                // Get the User-Object for this player
                UserObject user = IPcheck.Instance.Database.getIPs(online[i].getName());
                ArrayList<String> unique_names = new ArrayList<String>();

                // If, for some unknown reason, no IPs were found for the user,
                // skip them and move on.
                if (user.getNumberOfIPs() == 0) {
                    continue;
                }

                // Fetch IP-Objects
                ArrayList<IPObject> ipos = new ArrayList<IPObject>();

                for (String s:user.getIPs()) {
                    // Get alt accounts for the IP Address
                    ipos.add(IPcheck.Instance.Database.getAlts(s));
                }

                // Get unique accounts from the IP-Objects
                for (IPObject ipo:ipos) {
                    if (ipo.getNumberOfUsers() == 1) {
                        if (ipo.getUsers().contains(online[i].getName().toLowerCase())) {
                            if (!IPcheck.Instance.Configuration.shouldShowAllIPs) continue;
                        }
                    }

                    // Add each unique account found to arraylist
                    for (String account:ipo.getUsers()) {
                        if (!account.equalsIgnoreCase(online[i].getName())) {
                            if (!unique_names.contains(account.toLowerCase())) {
                                unique_names.add(account.toLowerCase());
                            }
                        }
                    }
                }

                // If multiple accounts were found for the user, add them to
                // the detection queue.
                if (unique_names.size() > 0) detected.add(online[i]);
            }

            // Display output to sender
            if (detected.size() > 0) {
                Player[] convert = new Player[detected.size()];
                detected.toArray(convert);

                sender.sendMessage(ChatColor.DARK_GRAY + "------------------------------------------------");
                sender.sendMessage(ChatColor.GOLD + IPcheck.PLUG_NAME + ChatColor.RED + "Player Scan Results");
                sender.sendMessage(ChatColor.DARK_GRAY + "------------------------------------------------");
                sender.sendMessage(ChatColor.GOLD + "The following players were found to have multiple accounts:");

                // Build the list of players
                StringBuilder sb = new StringBuilder();

                // List Formatting
                for (int i = 0; i < convert.length; i++) {
                    if (convert.length == 1) {
                        sb.append(convert[0].getName());
                        break;
                    } else if (convert.length == 2) {
                        sb.append(convert[0].getName());
                        sb.append(" and ");
                        sb.append(convert[1].getName());
                        break;
                    } else if (convert.length > 2) {
                        sb.append(convert[i].getName());

                        if (i == (convert.length - 2)) {
                            sb.append(" and ");
                        } else if (i == (convert.length - 1)) {
                            sb.append(".");
                        } else {
                            sb.append(", ");
                        }
                    }
                }

                // Display detected users
                sender.sendMessage(ChatColor.YELLOW + sb.toString());
                sender.sendMessage(ChatColor.DARK_GRAY + "------------------------------------------------");
            } else {
                sender.sendMessage(ChatColor.GOLD + IPcheck.PLUG_NAME + ChatColor.YELLOW +
                        IPcheck.Instance.Translation.getTranslation("SCAN_CLEAN"));
            }
        } else {
            sender.sendMessage(ChatColor.GOLD + IPcheck.PLUG_NAME + ChatColor.YELLOW +
                        IPcheck.Instance.Translation.getTranslation("NO_PERM_ERR"));
        }
    };

    @Override
    public String getHelp(){
        return "Scans all players currently logged in to check for any who " +
                "may possess multiple accounts.";
    };

    @Override
    public String getSyntax(){
        return "scan";
    };

    @Override
    public Permission[] getPermissions(){
        Permission perms[] = {
            new Permission("ipcheck.scan")
        };

        return perms;
    };

    @Override
    public String getName(){
        return "Scan";
    };

}