ClearCommand.java

package org.bukkit.command.defaults;

import com.google.common.collect.ImmutableList;
import org.apache.commons.lang.Validate;
import org.bukkit.Bukkit;
import org.bukkit.ChatColor;
import org.bukkit.Material;
import org.bukkit.command.Command;
import org.bukkit.command.CommandSender;
import org.bukkit.entity.Player;
import org.bukkit.util.StringUtil;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

public class ClearCommand extends VanillaCommand {
    private static List<String> materials;
    static {
        ArrayList<String> materialList = new ArrayList<String>();
        for (Material material : Material.values()) {
            materialList.add(material.name());
        }
        Collections.sort(materialList);
        materials = ImmutableList.copyOf(materialList);
    }

    public ClearCommand() {
        super("clear");
        this.description = "Clears the player's inventory. Can specify item and data filters too.";
        this.usageMessage = "/clear <player> [item] [data]";
        this.setPermission("bukkit.command.clear");
    }

    @Override
    public boolean execute(CommandSender sender, String currentAlias, String[] args) {
        if (!testPermission(sender)) return true;

        Player player = null;
        if (args.length > 0) {
            player = Bukkit.getPlayer(args[0]);
        } else if (sender instanceof Player) {
            player = (Player) sender;
        }

        if (player != null) {
            int id;

            if (args.length > 1 && !(args[1].equals("-1"))) {
                Material material = Material.matchMaterial(args[1]);
                if (material == null) {
                    sender.sendMessage(ChatColor.RED + "There's no item called " + args[1]);
                    return false;
                }

                id = material.getId();
            } else {
                id = -1;
            }

            int data = args.length >= 3 ? getInteger(sender, args[2], 0) : -1;
            int count = player.getInventory().clear(id, data);

            Command.broadcastCommandMessage(sender, "Cleared the inventory of " + player.getDisplayName() + ", removing " + count + " items");
        } else if (args.length == 0) {
            sender.sendMessage(ChatColor.RED + "Please provide a player!");
        } else {
            sender.sendMessage(ChatColor.RED + "Can't find player " + args[0]);
        }

        return true;
    }

    @Override
    public List<String> tabComplete(CommandSender sender, String alias, String[] args) throws IllegalArgumentException {
        Validate.notNull(sender, "Sender cannot be null");
        Validate.notNull(args, "Arguments cannot be null");
        Validate.notNull(alias, "Alias cannot be null");

        if (args.length == 1) {
            return super.tabComplete(sender, alias, args);
        }
        if (args.length == 2) {
            final String arg = args[1];
            final List<String> materials = ClearCommand.materials;
            List<String> completion = null;

            final int size = materials.size();
            int i = Collections.binarySearch(materials, arg, String.CASE_INSENSITIVE_ORDER);

            if (i < 0) {
                // Insertion (start) index
                i = -1 - i;
            }

            for ( ; i < size; i++) {
                String material = materials.get(i);
                if (StringUtil.startsWithIgnoreCase(material, arg)) {
                    if (completion == null) {
                        completion = new ArrayList<String>();
                    }
                    completion.add(material);
                } else {
                    break;
                }
            }

            if (completion != null) {
                return completion;
            }
        }
        return ImmutableList.of();
    }
}