001    package org.bukkit.command.defaults;
002    
003    import java.util.List;
004    
005    import org.apache.commons.lang.Validate;
006    import org.bukkit.Bukkit;
007    import org.bukkit.ChatColor;
008    import org.bukkit.command.Command;
009    import org.bukkit.command.CommandSender;
010    import org.bukkit.entity.Player;
011    
012    import com.google.common.collect.ImmutableList;
013    
014    public class ExpCommand extends VanillaCommand {
015        public ExpCommand() {
016            super("xp");
017            this.description = "Gives the specified player a certain amount of experience. Specify <amount>L to give levels instead, with a negative amount resulting in taking levels.";
018            this.usageMessage = "/xp <amount> [player] OR /xp <amount>L [player]";
019            this.setPermission("bukkit.command.xp");
020        }
021    
022        @Override
023        public boolean execute(CommandSender sender, String currentAlias, String[] args) {
024            if (!testPermission(sender)) return true;
025    
026            if (args.length > 0) {
027                String inputAmount = args[0];
028                Player player = null;
029    
030                boolean isLevel = inputAmount.endsWith("l") || inputAmount.endsWith("L");
031                if (isLevel && inputAmount.length() > 1) {
032                    inputAmount = inputAmount.substring(0, inputAmount.length() - 1);
033                }
034    
035                int amount = getInteger(sender, inputAmount, Integer.MIN_VALUE, Integer.MAX_VALUE);
036                boolean isTaking = amount < 0;
037    
038                if (isTaking) {
039                    amount *= -1;
040                }
041    
042                if (args.length > 1) {
043                    player = Bukkit.getPlayer(args[1]);
044                } else if (sender instanceof Player) {
045                    player = (Player) sender;
046                }
047    
048                if (player != null) {
049                    if (isLevel) {
050                        if (isTaking) {
051                            player.giveExpLevels(-amount);
052                            Command.broadcastCommandMessage(sender, "Taken " + amount + " level(s) from " + player.getName());
053                        } else {
054                            player.giveExpLevels(amount);
055                            Command.broadcastCommandMessage(sender, "Given " + amount + " level(s) to " + player.getName());
056                        }
057                    } else {
058                        if (isTaking) {
059                            sender.sendMessage(ChatColor.RED + "Taking experience can only be done by levels, cannot give players negative experience points");
060                            return false;
061                        } else {
062                            player.giveExp(amount);
063                            Command.broadcastCommandMessage(sender, "Given " + amount + " experience to " + player.getName());
064                        }
065                    }
066                } else {
067                    sender.sendMessage("Can't find player, was one provided?\n" + ChatColor.RED + "Usage: " + usageMessage);
068                    return false;
069                }
070    
071                return true;
072            }
073    
074            sender.sendMessage(ChatColor.RED + "Usage: " + usageMessage);
075            return false;
076        }
077    
078        @Override
079        public List<String> tabComplete(CommandSender sender, String alias, String[] args) throws IllegalArgumentException {
080            Validate.notNull(sender, "Sender cannot be null");
081            Validate.notNull(args, "Arguments cannot be null");
082            Validate.notNull(alias, "Alias cannot be null");
083    
084            if (args.length == 2) {
085                return super.tabComplete(sender, alias, args);
086            }
087            return ImmutableList.of();
088        }
089    }