Changed command system for easier integration of "addons"

src/main/java/de/epiceric/shopchest/ShopChest.java

@@ -3,6 +3,7 @@ package de.epiceric.shopchest;
 import com.palmergames.bukkit.towny.Towny;
 import com.sk89q.worldguard.bukkit.WorldGuardPlugin;
 import com.wasteofplastic.askyblock.ASkyBlock;
+import de.epiceric.shopchest.command.ShopCommand;
 import de.epiceric.shopchest.config.Config;
 import de.epiceric.shopchest.config.HologramFormat;
 import de.epiceric.shopchest.config.Placeholder;

src/main/java/de/epiceric/shopchest/command/ShopCommand.java

@@ -0,0 +1,295 @@
+package de.epiceric.shopchest.command;
+
+import de.epiceric.shopchest.ShopChest;
+import de.epiceric.shopchest.config.Placeholder;
+import de.epiceric.shopchest.language.LanguageUtils;
+import de.epiceric.shopchest.language.LocalizedMessage;
+import de.epiceric.shopchest.utils.Permissions;
+import org.bukkit.Bukkit;
+import org.bukkit.ChatColor;
+import org.bukkit.command.Command;
+import org.bukkit.command.CommandExecutor;
+import org.bukkit.command.CommandMap;
+import org.bukkit.command.CommandSender;
+import org.bukkit.command.PluginCommand;
+import org.bukkit.command.TabCompleter;
+import org.bukkit.entity.Player;
+import org.bukkit.permissions.PermissionAttachmentInfo;
+import org.bukkit.plugin.Plugin;
+
+import java.lang.reflect.Constructor;
+import java.lang.reflect.Field;
+import java.lang.reflect.InvocationTargetException;
+import java.util.ArrayList;
+import java.util.List;
+
+public class ShopCommand {
+
+    private static boolean commandCreated = false;
+
+    private ShopChest plugin;
+    private String name;
+    private PluginCommand pluginCommand;
+
+    private List<ShopSubCommand> subCommands = new ArrayList<>();
+
+    public ShopCommand(final ShopChest plugin) {
+        if (commandCreated) {
+            IllegalStateException e = new IllegalStateException("Command has already been registered");
+            plugin.debug(e);
+            throw e;
+        }
+
+        this.plugin = plugin;
+        this.name = plugin.getShopChestConfig().main_command_name;
+        this.pluginCommand = createPluginCommand();
+
+        ShopCommandExecutor executor = new ShopCommandExecutor(plugin);
+        ShopTabCompleter tabCompleter = new ShopTabCompleter(plugin);
+
+        final LocalizedMessage.ReplacedPlaceholder cmdPlaceholder = new LocalizedMessage.ReplacedPlaceholder(
+                Placeholder.COMMAND, plugin.getShopChestConfig().main_command_name);
+
+        addSubCommand(new ShopSubCommand("create", true, executor, tabCompleter) {
+            @Override
+            public String getHelpMessage(CommandSender sender) {
+                boolean receiveCreateMessage = sender.hasPermission(Permissions.CREATE);
+                if (!receiveCreateMessage) {
+                    for (PermissionAttachmentInfo permInfo : sender.getEffectivePermissions()) {
+                        String perm = permInfo.getPermission();
+                        if (perm.startsWith(Permissions.CREATE) && sender.hasPermission(perm)) {
+                            receiveCreateMessage = true;
+                            break;
+                        }
+                    }
+                }
+
+                if (sender.hasPermission(Permissions.CREATE_ADMIN)) {
+                    return LanguageUtils.getMessage(LocalizedMessage.Message.COMMAND_DESC_CREATE_ADMIN, cmdPlaceholder);
+                } else if (receiveCreateMessage) {
+                    return LanguageUtils.getMessage(LocalizedMessage.Message.COMMAND_DESC_CREATE, cmdPlaceholder);
+                }
+
+                return "";
+            }
+        });
+
+        addSubCommand(new ShopSubCommand("remove", true, executor, tabCompleter) {
+            @Override
+            public String getHelpMessage(CommandSender sender) {
+                return LanguageUtils.getMessage(LocalizedMessage.Message.COMMAND_DESC_REMOVE, cmdPlaceholder);
+            }
+        });
+
+        addSubCommand(new ShopSubCommand("info", true, executor, tabCompleter) {
+            @Override
+            public String getHelpMessage(CommandSender sender) {
+                return LanguageUtils.getMessage(LocalizedMessage.Message.COMMAND_DESC_INFO, cmdPlaceholder);
+            }
+        });
+
+        addSubCommand(new ShopSubCommand("limits", true, executor, tabCompleter) {
+            @Override
+            public String getHelpMessage(CommandSender sender) {
+                return LanguageUtils.getMessage(LocalizedMessage.Message.COMMAND_DESC_LIMITS, cmdPlaceholder);
+            }
+        });
+
+        addSubCommand(new ShopSubCommand("open", true, executor, tabCompleter) {
+            @Override
+            public String getHelpMessage(CommandSender sender) {
+                return LanguageUtils.getMessage(LocalizedMessage.Message.COMMAND_DESC_OPEN, cmdPlaceholder);
+            }
+        });
+
+        addSubCommand(new ShopSubCommand("removeall", false, executor, tabCompleter) {
+            @Override
+            public String getHelpMessage(CommandSender sender) {
+                if (sender.hasPermission(Permissions.REMOVE_OTHER)) {
+                    return LanguageUtils.getMessage(LocalizedMessage.Message.COMMAND_DESC_REMOVEALL, cmdPlaceholder);
+                } else {
+                    return "";
+                }
+            }
+        });
+
+        addSubCommand(new ShopSubCommand("reload", false, executor, tabCompleter) {
+            @Override
+            public String getHelpMessage(CommandSender sender) {
+                if (sender.hasPermission(Permissions.RELOAD)) {
+                    return LanguageUtils.getMessage(LocalizedMessage.Message.COMMAND_DESC_RELOAD, cmdPlaceholder);
+                } else {
+                    return "";
+                }
+            }
+        });
+
+        addSubCommand(new ShopSubCommand("update", false, executor, tabCompleter) {
+            @Override
+            public String getHelpMessage(CommandSender sender) {
+                if (sender.hasPermission(Permissions.UPDATE)) {
+                    return LanguageUtils.getMessage(LocalizedMessage.Message.COMMAND_DESC_UPDATE, cmdPlaceholder);
+                } else {
+                    return "";
+                }
+            }
+        });
+
+        addSubCommand(new ShopSubCommand("config", false, executor, tabCompleter) {
+            @Override
+            public String getHelpMessage(CommandSender sender) {
+                if (sender.hasPermission(Permissions.CONFIG)) {
+                    return LanguageUtils.getMessage(LocalizedMessage.Message.COMMAND_DESC_CONFIG, cmdPlaceholder);
+                } else {
+                    return "";
+                }
+            }
+        });
+
+        register();
+        commandCreated = true;
+    }
+
+    public PluginCommand getCommand() {
+        return pluginCommand;
+    }
+
+    private PluginCommand createPluginCommand() {
+        plugin.debug("Creating plugin command");
+        try {
+            Constructor<PluginCommand> c = PluginCommand.class.getDeclaredConstructor(String.class, Plugin.class);
+            c.setAccessible(true);
+
+            PluginCommand cmd = c.newInstance(name, plugin);
+            cmd.setDescription("Manage players' shops or this plugin.");
+            cmd.setUsage("/" + name);
+            cmd.setExecutor(new ShopBaseCommandExecutor());
+            cmd.setTabCompleter(new ShopBaseTabCompleter());
+
+            return cmd;
+        } catch (NoSuchMethodException | IllegalAccessException | InvocationTargetException | InstantiationException e) {
+            plugin.getLogger().severe("Failed to create command");
+            plugin.debug("Failed to create plugin command");
+            plugin.debug(e);
+        }
+
+        return null;
+    }
+
+    public void addSubCommand(ShopSubCommand subCommand) {
+        plugin.debug("Adding sub command \"" + subCommand.getName() + "\"");
+        this.subCommands.add(subCommand);
+    }
+
+    public List<ShopSubCommand> getSubCommands() {
+        return new ArrayList<>(subCommands);
+    }
+
+    private void register() {
+        if (pluginCommand == null) return;
+
+        plugin.debug("Registering command " + name);
+
+        try {
+            Field f = Bukkit.getPluginManager().getClass().getDeclaredField("commandMap");
+            f.setAccessible(true);
+
+            Object commandMapObject = f.get(Bukkit.getPluginManager());
+            if (commandMapObject instanceof CommandMap) {
+                CommandMap commandMap = (CommandMap) commandMapObject;
+                commandMap.register(plugin.getName(), pluginCommand);
+            }
+        } catch (NoSuchFieldException | IllegalAccessException e) {
+            plugin.getLogger().severe("Failed to register command");
+            plugin.debug("Failed to register plugin command");
+            plugin.debug(e);
+        }
+    }
+
+    /**
+     * Sends the basic help message
+     * @param sender {@link CommandSender} who will receive the message
+     */
+    private void sendBasicHelpMessage(CommandSender sender) {
+        plugin.debug("Sending basic help message to " + sender.getName());
+
+        sender.sendMessage(" ");
+
+        for (ShopSubCommand subCommand : subCommands) {
+            String msg = subCommand.getHelpMessage(sender);
+            if (msg == null || msg.isEmpty()) {
+                continue;
+            }
+
+            sender.sendMessage(msg);
+        }
+
+        sender.sendMessage(" ");
+    }
+
+    private class ShopBaseCommandExecutor implements CommandExecutor {
+
+        @Override
+        public boolean onCommand(CommandSender sender, Command command, String label, String[] args) {
+            if (args.length > 0) {
+                for (ShopSubCommand subCommand : subCommands) {
+                    if (subCommand.getName().equalsIgnoreCase(args[0])) {
+                        if (!(sender instanceof Player) && subCommand.isPlayerCommand()) {
+                            sender.sendMessage(ChatColor.RED + "Only players can use this command.");
+                            return true;
+                        }
+
+                        if (!subCommand.execute(sender, command, label, args)) {
+                            sendBasicHelpMessage(sender);
+                        }
+
+                        return true;
+                    }
+                }
+
+                sendBasicHelpMessage(sender);
+            } else {
+                sendBasicHelpMessage(sender);
+            }
+
+            return true;
+        }
+    }
+
+    private class ShopBaseTabCompleter implements TabCompleter {
+
+        @Override
+        public List<String> onTabComplete(CommandSender sender, Command command, String label, String[] args) {
+            List<String> subCommandNames = new ArrayList<>();
+
+            List<String> tabCompletions = new ArrayList<>();
+
+            for (ShopSubCommand subCommand : subCommands) {
+                subCommandNames.add(subCommand.getName());
+            }
+
+            if (args.length == 1) {
+                if (!args[0].isEmpty()) {
+                    for (String s : subCommandNames) {
+                        if (s.startsWith(args[0])) {
+                            tabCompletions.add(s);
+                        }
+                    }
+                    return tabCompletions;
+                } else {
+                    return subCommandNames;
+                }
+            } else if (args.length > 1) {
+                for (ShopSubCommand subCmd : subCommands) {
+                    if (subCmd.getName().equalsIgnoreCase(args[0])) {
+                        return subCmd.getTabCompletions(sender, command, label, args);
+                    }
+                }
+            }
+
+            return new ArrayList<>();
+        }
+
+    }
+
+}

src/main/java/de/epiceric/shopchest/command/ShopCommandExecutor.java

@@ -1,5 +1,6 @@
-package de.epiceric.shopchest;
+package de.epiceric.shopchest.command;
 
+import de.epiceric.shopchest.ShopChest;
 import de.epiceric.shopchest.config.Placeholder;
 import de.epiceric.shopchest.event.ShopPreCreateEvent;
 import de.epiceric.shopchest.event.ShopPreInfoEvent;
@@ -11,214 +12,127 @@ import de.epiceric.shopchest.language.LanguageUtils;
 import de.epiceric.shopchest.language.LocalizedMessage;
 import de.epiceric.shopchest.nms.JsonBuilder;
 import de.epiceric.shopchest.shop.Shop;
-import de.epiceric.shopchest.shop.Shop.ShopType;
 import de.epiceric.shopchest.utils.Callback;
 import de.epiceric.shopchest.utils.ClickType;
-import de.epiceric.shopchest.utils.ClickType.EnumClickType;
 import de.epiceric.shopchest.utils.ItemUtils;
 import de.epiceric.shopchest.utils.Permissions;
 import de.epiceric.shopchest.utils.ShopUtils;
 import de.epiceric.shopchest.utils.UpdateChecker;
-import de.epiceric.shopchest.utils.UpdateChecker.UpdateCheckerResult;
 import de.epiceric.shopchest.utils.Utils;
 import org.bukkit.Bukkit;
-import org.bukkit.ChatColor;
 import org.bukkit.OfflinePlayer;
 import org.bukkit.command.Command;
 import org.bukkit.command.CommandExecutor;
-import org.bukkit.command.CommandMap;
 import org.bukkit.command.CommandSender;
-import org.bukkit.command.PluginCommand;
 import org.bukkit.enchantments.Enchantment;
 import org.bukkit.entity.Player;
 import org.bukkit.inventory.ItemStack;
-import org.bukkit.permissions.PermissionAttachmentInfo;
-import org.bukkit.plugin.Plugin;
 import org.bukkit.scheduler.BukkitRunnable;
 
-import java.lang.reflect.Constructor;
-import java.lang.reflect.Field;
-import java.lang.reflect.InvocationTargetException;
 import java.util.ArrayList;
 import java.util.List;
-import java.util.Locale;
 
-class ShopCommand implements CommandExecutor {
+class ShopCommandExecutor implements CommandExecutor {
 
     private ShopChest plugin;
-    private String name;
     private ShopUtils shopUtils;
-    private PluginCommand pluginCommand;
 
-    ShopCommand(ShopChest plugin) {
+    ShopCommandExecutor(ShopChest plugin) {
         this.plugin = plugin;
-        this.name = plugin.getShopChestConfig().main_command_name;
         this.shopUtils = plugin.getShopUtils();
-        this.pluginCommand = createPluginCommand();
-
-        register();
-    }
-
-    public PluginCommand getCommand() {
-        return pluginCommand;
-    }
-
-    private PluginCommand createPluginCommand() {
-        plugin.debug("Creating plugin command");
-        try {
-            Constructor<PluginCommand> c = PluginCommand.class.getDeclaredConstructor(String.class, Plugin.class);
-            c.setAccessible(true);
-
-            PluginCommand cmd = c.newInstance(name, plugin);
-            cmd.setDescription("Manage players' shops or this plugin.");
-            cmd.setUsage("/" + name);
-            cmd.setExecutor(this);
-            cmd.setTabCompleter(new ShopTabCompleter(plugin));
-
-            return cmd;
-        } catch (NoSuchMethodException | IllegalAccessException | InvocationTargetException | InstantiationException e) {
-            plugin.getLogger().severe("Failed to create command");
-            plugin.debug("Failed to create plugin command");
-            plugin.debug(e);
-        }
-
-        return null;
-    }
-
-    private void register() {
-        if (pluginCommand == null) return;
-
-        plugin.debug("Registering command " + name);
-
-        try {
-            Field f = Bukkit.getPluginManager().getClass().getDeclaredField("commandMap");
-            f.setAccessible(true);
-
-            Object commandMapObject = f.get(Bukkit.getPluginManager());
-            if (commandMapObject instanceof CommandMap) {
-                CommandMap commandMap = (CommandMap) commandMapObject;
-                commandMap.register(plugin.getName(), pluginCommand);
-            }
-        } catch (NoSuchFieldException | IllegalAccessException e) {
-            plugin.getLogger().severe("Failed to register command");
-            plugin.debug("Failed to register plugin command");
-            plugin.debug(e);
-        }
     }
 
     @Override
-    public boolean onCommand(CommandSender sender, Command command, String label, String[] args) {
+    public boolean onCommand(CommandSender sender, Command command, String s, String[] args) {
-        boolean needsHelp = true;
+        List<ShopSubCommand> subCommands = plugin.getShopCommand().getSubCommands();
 
         if (args.length > 0) {
-            if (!(sender instanceof Player)) {
+            String _subCommand = args[0];
-                switch (args[0].toUpperCase(Locale.US)) {
+            ShopSubCommand subCommand = null;
-                    case "CREATE":
-                    case "REMOVE":
-                    case "INFO":
-                    case "LIMITS":
-                    case "OPEN":
-                        sender.sendMessage(ChatColor.RED + "Only players can use this command.");
-                        return true;
-                }
-            } else {
-                Player p = (Player) sender;
 
-                if (args[0].equalsIgnoreCase("create")) {
+            for (ShopSubCommand shopSubCommand : subCommands) {
-                    if (args.length == 4) {
+                if (shopSubCommand.getName().equalsIgnoreCase(_subCommand)) {
-                        needsHelp = false;
+                    subCommand = shopSubCommand;
-                        create(args, ShopType.NORMAL, p);
+                    break;
-                    } else if (args.length == 5) {
-                        if (args[4].equalsIgnoreCase("normal")) {
-                            needsHelp = false;
-                            create(args, ShopType.NORMAL, p);
-                        } else if (args[4].equalsIgnoreCase("admin")) {
-                            needsHelp = false;
-                            if (p.hasPermission(Permissions.CREATE_ADMIN)) {
-                                create(args, ShopType.ADMIN, p);
-                            } else {
-                                p.sendMessage(LanguageUtils.getMessage(LocalizedMessage.Message.NO_PERMISSION_CREATE_ADMIN));
-                            }
-                        }
-                    }
-                } else if (args[0].equalsIgnoreCase("remove")) {
-                    needsHelp = false;
-                    remove(p);
-                } else if (args[0].equalsIgnoreCase("info")) {
-                    needsHelp = false;
-                    info(p);
-                } else if (args[0].equalsIgnoreCase("limits")) {
-                    needsHelp = false;
-                    plugin.debug(p.getName() + " is viewing his shop limits: " + shopUtils.getShopAmount(p) + "/" + shopUtils.getShopLimit(p));
-                    int limit = shopUtils.getShopLimit(p);
-                    p.sendMessage(LanguageUtils.getMessage(LocalizedMessage.Message.OCCUPIED_SHOP_SLOTS,
-                            new LocalizedMessage.ReplacedPlaceholder(Placeholder.LIMIT, (limit < 0 ? "∞" : String.valueOf(limit))),
-                            new LocalizedMessage.ReplacedPlaceholder(Placeholder.AMOUNT, String.valueOf(shopUtils.getShopAmount(p)))));
-                } else if (args[0].equalsIgnoreCase("open")) {
-                    needsHelp = false;
-                    open(p);
                 }
             }
 
-            if (args[0].equalsIgnoreCase("reload")) {
+            if (subCommand == null) {
-                needsHelp = false;
+                return false;
+            }
+
+            if (subCommand.getName().equalsIgnoreCase("reload")) {
                 if (sender.hasPermission(Permissions.RELOAD)) {
                     reload(sender);
                 } else {
                     sender.sendMessage(LanguageUtils.getMessage(LocalizedMessage.Message.NO_PERMISSION_RELOAD));
                 }
-            } else if (args[0].equalsIgnoreCase("update")) {
+            } else if (subCommand.getName().equalsIgnoreCase("update")) {
-                needsHelp = false;
                 if (sender.hasPermission(Permissions.UPDATE)) {
                     checkUpdates(sender);
                 } else {
                     sender.sendMessage(LanguageUtils.getMessage(LocalizedMessage.Message.NO_PERMISSION_UPDATE));
                 }
-            } else if (args[0].equalsIgnoreCase("config")) {
+            } else if (subCommand.getName().equalsIgnoreCase("config")) {
                 if (sender.hasPermission(Permissions.CONFIG)) {
-                    if (args.length >= 4) {
+                    return args.length >= 4 && changeConfig(sender, args);
-                        needsHelp = false;
-                        changeConfig(sender, args);
-                    }
                 } else {
-                    needsHelp = false;
                     sender.sendMessage(LanguageUtils.getMessage(LocalizedMessage.Message.NO_PERMISSION_CONFIG));
                 }
-            } else if (args[0].equalsIgnoreCase("removeall")) {
+            } else if (subCommand.getName().equalsIgnoreCase("removeall")) {
                 if (sender.hasPermission(Permissions.REMOVE_OTHER)) {
                     if (args.length >= 2) {
-                        needsHelp = false;
                         removeAll(sender, args);
+                    } else {
+                        return false;
                     }
                 } else {
-                    needsHelp = false;
                     sender.sendMessage(LanguageUtils.getMessage(LocalizedMessage.Message.NO_PERMISSION_REMOVE_OTHERS));
                 }
+            } else {
+                if (sender instanceof Player) {
+                    Player p = (Player) sender;
+
+                    if (subCommand.getName().equalsIgnoreCase("create")) {
+                        if (args.length == 4) {
+                            create(args, Shop.ShopType.NORMAL, p);
+                        } else if (args.length == 5) {
+                            if (args[4].equalsIgnoreCase("normal")) {
+                                create(args, Shop.ShopType.NORMAL, p);
+                            } else if (args[4].equalsIgnoreCase("admin")) {
+                                if (p.hasPermission(Permissions.CREATE_ADMIN)) {
+                                    create(args, Shop.ShopType.ADMIN, p);
+                                } else {
+                                    p.sendMessage(LanguageUtils.getMessage(LocalizedMessage.Message.NO_PERMISSION_CREATE_ADMIN));
+                                }
+                            } else {
+                                return false;
+                            }
+                        } else {
+                            return false;
+                        }
+                    } else if (subCommand.getName().equalsIgnoreCase("remove")) {
+                        remove(p);
+                    } else if (subCommand.getName().equalsIgnoreCase("info")) {
+                        info(p);
+                    } else if (subCommand.getName().equalsIgnoreCase("limits")) {
+                        plugin.debug(p.getName() + " is viewing his shop limits: " + shopUtils.getShopAmount(p) + "/" + shopUtils.getShopLimit(p));
+                        int limit = shopUtils.getShopLimit(p);
+                        p.sendMessage(LanguageUtils.getMessage(LocalizedMessage.Message.OCCUPIED_SHOP_SLOTS,
+                                new LocalizedMessage.ReplacedPlaceholder(Placeholder.LIMIT, (limit < 0 ? "∞" : String.valueOf(limit))),
+                                new LocalizedMessage.ReplacedPlaceholder(Placeholder.AMOUNT, String.valueOf(shopUtils.getShopAmount(p)))));
+                    } else if (subCommand.getName().equalsIgnoreCase("open")) {
+                        open(p);
+                    } else {
+                        return false;
+                    }
+                }
             }
+
+            return true;
         }
 
-        if (needsHelp) sendBasicHelpMessage(sender);
+        return false;
-        return true;
-    }
-
-    private void changeConfig(CommandSender sender, String[] args) {
-        plugin.debug(sender.getName() + " is changing the configuration");
-
-        String property = args[2];
-        String value = args[3];
-
-        if (args[1].equalsIgnoreCase("set")) {
-            plugin.getShopChestConfig().set(property, value);
-            sender.sendMessage(LanguageUtils.getMessage(LocalizedMessage.Message.CHANGED_CONFIG_SET, new LocalizedMessage.ReplacedPlaceholder(Placeholder.PROPERTY, property), new LocalizedMessage.ReplacedPlaceholder(Placeholder.VALUE, value)));
-        } else if (args[1].equalsIgnoreCase("add")) {
-            plugin.getShopChestConfig().add(property, value);
-            sender.sendMessage(LanguageUtils.getMessage(LocalizedMessage.Message.CHANGED_CONFIG_ADDED, new LocalizedMessage.ReplacedPlaceholder(Placeholder.PROPERTY, property), new LocalizedMessage.ReplacedPlaceholder(Placeholder.VALUE, value)));
-        } else if (args[1].equalsIgnoreCase("remove")) {
-            plugin.getShopChestConfig().remove(property, value);
-            sender.sendMessage(LanguageUtils.getMessage(LocalizedMessage.Message.CHANGED_CONFIG_REMOVED, new LocalizedMessage.ReplacedPlaceholder(Placeholder.PROPERTY, property), new LocalizedMessage.ReplacedPlaceholder(Placeholder.VALUE, value)));
-        } else {
-            sendBasicHelpMessage(sender);
-        }
     }
 
     /**
@@ -231,9 +145,9 @@ class ShopCommand implements CommandExecutor {
         sender.sendMessage(LanguageUtils.getMessage(LocalizedMessage.Message.UPDATE_CHECKING));
 
         UpdateChecker uc = new UpdateChecker(ShopChest.getInstance());
-        UpdateCheckerResult result = uc.check();
+        UpdateChecker.UpdateCheckerResult result = uc.check();
 
-        if (result == UpdateCheckerResult.TRUE) {
+        if (result == UpdateChecker.UpdateCheckerResult.TRUE) {
             plugin.setLatestVersion(uc.getVersion());
             plugin.setDownloadLink(uc.getLink());
             plugin.setUpdateNeeded(true);
@@ -245,7 +159,7 @@ class ShopCommand implements CommandExecutor {
                 sender.sendMessage(LanguageUtils.getMessage(LocalizedMessage.Message.UPDATE_AVAILABLE, new LocalizedMessage.ReplacedPlaceholder(Placeholder.VERSION, uc.getVersion())));
             }
 
-        } else if (result == UpdateCheckerResult.FALSE) {
+        } else if (result == UpdateChecker.UpdateCheckerResult.FALSE) {
             plugin.setLatestVersion("");
             plugin.setDownloadLink("");
             plugin.setUpdateNeeded(false);
@@ -282,16 +196,15 @@ class ShopCommand implements CommandExecutor {
                 }
             }
         });
-
     }
 
     /**
      * A given player creates a shop
      * @param args Arguments of the entered command
-     * @param shopType The {@link ShopType}, the shop will have
+     * @param shopType The {@link Shop.ShopType}, the shop will have
      * @param p The command executor
      */
-    private void create(String[] args, ShopType shopType, final Player p) {
+    private void create(String[] args, Shop.ShopType shopType, final Player p) {
         plugin.debug(p.getName() + " wants to create a shop");
 
         int amount;
@@ -318,7 +231,7 @@ class ShopCommand implements CommandExecutor {
         int limit = shopUtils.getShopLimit(p);
         if (limit != -1) {
             if (shopUtils.getShopAmount(p) >= limit) {
-                if (shopType != ShopType.ADMIN || !plugin.getShopChestConfig().exclude_admin_shops) {
+                if (shopType != Shop.ShopType.ADMIN || !plugin.getShopChestConfig().exclude_admin_shops) {
                     p.sendMessage(LanguageUtils.getMessage(LocalizedMessage.Message.SHOP_LIMIT_REACHED, new LocalizedMessage.ReplacedPlaceholder(Placeholder.LIMIT, String.valueOf(limit))));
                     plugin.debug(p.getName() + " has reached the limit");
                     return;
@@ -455,7 +368,7 @@ class ShopCommand implements CommandExecutor {
             }
         }
 
-        double creationPrice = (shopType == ShopType.NORMAL) ? plugin.getShopChestConfig().shop_creation_price_normal : plugin.getShopChestConfig().shop_creation_price_admin;
+        double creationPrice = (shopType == Shop.ShopType.NORMAL) ? plugin.getShopChestConfig().shop_creation_price_normal : plugin.getShopChestConfig().shop_creation_price_admin;
         if (creationPrice > 0) {
             if (plugin.getEconomy().getBalance(p, p.getWorld().getName()) < creationPrice) {
                 p.sendMessage(LanguageUtils.getMessage(LocalizedMessage.Message.SHOP_CREATE_NOT_ENOUGH_MONEY, new LocalizedMessage.ReplacedPlaceholder(Placeholder.CREATION_PRICE, String.valueOf(creationPrice))));
@@ -468,7 +381,7 @@ class ShopCommand implements CommandExecutor {
         Bukkit.getPluginManager().callEvent(event);
 
         if (!event.isCancelled()) {
-            ClickType.setPlayerClickType(p, new ClickType(EnumClickType.CREATE, product, buyPrice, sellPrice, shopType));
+            ClickType.setPlayerClickType(p, new ClickType(ClickType.EnumClickType.CREATE, product, buyPrice, sellPrice, shopType));
             plugin.debug(p.getName() + " can now click a chest");
             p.sendMessage(LanguageUtils.getMessage(LocalizedMessage.Message.CLICK_CHEST_CREATE));
 
@@ -500,7 +413,7 @@ class ShopCommand implements CommandExecutor {
 
         plugin.debug(p.getName() + " can now click a chest");
         p.sendMessage(LanguageUtils.getMessage(LocalizedMessage.Message.CLICK_CHEST_REMOVE));
-        ClickType.setPlayerClickType(p, new ClickType(EnumClickType.REMOVE));
+        ClickType.setPlayerClickType(p, new ClickType(ClickType.EnumClickType.REMOVE));
 
         // Remove ClickType after 15 seconds if player has not clicked a chest
         new BukkitRunnable() {
@@ -527,7 +440,7 @@ class ShopCommand implements CommandExecutor {
 
         plugin.debug(p.getName() + " can now click a chest");
         p.sendMessage(LanguageUtils.getMessage(LocalizedMessage.Message.CLICK_CHEST_INFO));
-        ClickType.setPlayerClickType(p, new ClickType(EnumClickType.INFO));
+        ClickType.setPlayerClickType(p, new ClickType(ClickType.EnumClickType.INFO));
 
         // Remove ClickType after 15 seconds if player has not clicked a chest
         new BukkitRunnable() {
@@ -554,7 +467,7 @@ class ShopCommand implements CommandExecutor {
 
         plugin.debug(p.getName() + " can now click a chest");
         p.sendMessage(LanguageUtils.getMessage(LocalizedMessage.Message.CLICK_CHEST_OPEN));
-        ClickType.setPlayerClickType(p, new ClickType(EnumClickType.OPEN));
+        ClickType.setPlayerClickType(p, new ClickType(ClickType.EnumClickType.OPEN));
 
         // Remove ClickType after 15 seconds if player has not clicked a chest
         new BukkitRunnable() {
@@ -565,6 +478,28 @@ class ShopCommand implements CommandExecutor {
         }.runTaskLater(plugin, 300);
     }
 
+    private boolean changeConfig(CommandSender sender, String[] args) {
+        plugin.debug(sender.getName() + " is changing the configuration");
+
+        String property = args[2];
+        String value = args[3];
+
+        if (args[1].equalsIgnoreCase("set")) {
+            plugin.getShopChestConfig().set(property, value);
+            sender.sendMessage(LanguageUtils.getMessage(LocalizedMessage.Message.CHANGED_CONFIG_SET, new LocalizedMessage.ReplacedPlaceholder(Placeholder.PROPERTY, property), new LocalizedMessage.ReplacedPlaceholder(Placeholder.VALUE, value)));
+        } else if (args[1].equalsIgnoreCase("add")) {
+            plugin.getShopChestConfig().add(property, value);
+            sender.sendMessage(LanguageUtils.getMessage(LocalizedMessage.Message.CHANGED_CONFIG_ADDED, new LocalizedMessage.ReplacedPlaceholder(Placeholder.PROPERTY, property), new LocalizedMessage.ReplacedPlaceholder(Placeholder.VALUE, value)));
+        } else if (args[1].equalsIgnoreCase("remove")) {
+            plugin.getShopChestConfig().remove(property, value);
+            sender.sendMessage(LanguageUtils.getMessage(LocalizedMessage.Message.CHANGED_CONFIG_REMOVED, new LocalizedMessage.ReplacedPlaceholder(Placeholder.PROPERTY, property), new LocalizedMessage.ReplacedPlaceholder(Placeholder.VALUE, value)));
+        } else {
+            return false;
+        }
+
+        return true;
+    }
+
     private void removeAll(CommandSender sender, String[] args) {
         OfflinePlayer vendor = Bukkit.getOfflinePlayer(args[1]);
 
@@ -593,59 +528,4 @@ class ShopCommand implements CommandExecutor {
                 new LocalizedMessage.ReplacedPlaceholder(Placeholder.AMOUNT, String.valueOf(shops.size())),
                 new LocalizedMessage.ReplacedPlaceholder(Placeholder.VENDOR, vendor.getName())));
     }
-
-    /**
-     * Sends the basic help message
-     * @param sender {@link CommandSender} who will receive the message
-     */
-    private void sendBasicHelpMessage(CommandSender sender) {
-        plugin.debug("Sending basic help message to " + sender.getName());
-
-        boolean receiveCreateMessage = sender.hasPermission(Permissions.CREATE);
-        if (!receiveCreateMessage) {
-            for (PermissionAttachmentInfo permInfo : sender.getEffectivePermissions()) {
-                String perm = permInfo.getPermission();
-                if (perm.startsWith(Permissions.CREATE) && sender.hasPermission(perm)) {
-                    receiveCreateMessage = true;
-                    break;
-                }
-            }
-        }
-
-        sender.sendMessage(" ");
-
-        LocalizedMessage.ReplacedPlaceholder cmdPlaceholder = new LocalizedMessage.ReplacedPlaceholder(Placeholder.COMMAND, plugin.getShopChestConfig().main_command_name);
-
-        if (sender instanceof Player) {
-            if (sender.hasPermission(Permissions.CREATE_ADMIN)) {
-                sender.sendMessage(LanguageUtils.getMessage(LocalizedMessage.Message.COMMAND_DESC_CREATE_ADMIN, cmdPlaceholder));
-            } else if (receiveCreateMessage) {
-                sender.sendMessage(LanguageUtils.getMessage(LocalizedMessage.Message.COMMAND_DESC_CREATE, cmdPlaceholder));
-            }
-
-            sender.sendMessage(LanguageUtils.getMessage(LocalizedMessage.Message.COMMAND_DESC_REMOVE, cmdPlaceholder));
-            sender.sendMessage(LanguageUtils.getMessage(LocalizedMessage.Message.COMMAND_DESC_INFO, cmdPlaceholder));
-            sender.sendMessage(LanguageUtils.getMessage(LocalizedMessage.Message.COMMAND_DESC_LIMITS, cmdPlaceholder));
-            sender.sendMessage(LanguageUtils.getMessage(LocalizedMessage.Message.COMMAND_DESC_OPEN, cmdPlaceholder));
-        }
-
-        if (sender.hasPermission(Permissions.REMOVE_OTHER)) {
-            sender.sendMessage(LanguageUtils.getMessage(LocalizedMessage.Message.COMMAND_DESC_REMOVEALL, cmdPlaceholder));
-        }
-
-        if (sender.hasPermission(Permissions.RELOAD)) {
-            sender.sendMessage(LanguageUtils.getMessage(LocalizedMessage.Message.COMMAND_DESC_RELOAD, cmdPlaceholder));
-        }
-
-        if (sender.hasPermission(Permissions.UPDATE)) {
-            sender.sendMessage(LanguageUtils.getMessage(LocalizedMessage.Message.COMMAND_DESC_UPDATE, cmdPlaceholder));
-        }
-
-        if (sender.hasPermission(Permissions.CONFIG)) {
-            sender.sendMessage(LanguageUtils.getMessage(LocalizedMessage.Message.COMMAND_DESC_CONFIG, cmdPlaceholder));
-        }
-
-        sender.sendMessage(" ");
-    }
-
 }

src/main/java/de/epiceric/shopchest/command/ShopSubCommand.java

@@ -0,0 +1,65 @@
+package de.epiceric.shopchest.command;
+
+import org.bukkit.command.Command;
+import org.bukkit.command.CommandExecutor;
+import org.bukkit.command.CommandSender;
+import org.bukkit.command.TabCompleter;
+
+import java.util.ArrayList;
+import java.util.List;
+
+public abstract class ShopSubCommand {
+    private String name;
+    private boolean playerCommand;
+    private CommandExecutor executor;
+    private TabCompleter tabCompleter;
+
+    public ShopSubCommand(String name, boolean playerCommand, CommandExecutor executor, TabCompleter tabCompleter) {
+        this.name = name;
+        this.playerCommand = playerCommand;
+        this.executor = executor;
+        this.tabCompleter = tabCompleter;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    /**
+     * Returns whether the command can only be used by players, not by the console
+     */
+    public boolean isPlayerCommand() {
+        return playerCommand;
+    }
+
+    /**
+     * Execute the sub command
+     * @param sender Sender of the command
+     * @param args Arguments of the command ({@code args[0]} is the sub command's name)
+     * @return Whether the sender should be sent the help message
+     */
+    public boolean execute(CommandSender sender, Command command, String label, String[] args) {
+        return executor.onCommand(sender, command, label, args);
+    }
+
+    /**
+     * <p>Returns a list of tab completions for the sub command</p>
+     * The main sub command will be tab completed by ShopChest
+     * @param sender Sender of the command
+     * @param args Arguments of the command ({@code args[0]} is the sub command's name)
+     * @return A list of tab completions (may be an empty list)
+     */
+    public List<String> getTabCompletions(CommandSender sender, Command command, String label, String[] args) {
+        if (tabCompleter == null) {
+            return new ArrayList<>();
+        }
+
+        return tabCompleter.onTabComplete(sender, command, label, args);
+    }
+
+    /**
+     * Returns the help message for the command.
+     * @param sender Sender to receive the help message
+     */
+    public abstract String getHelpMessage(CommandSender sender);
+}

src/main/java/de/epiceric/shopchest/command/ShopTabCompleter.java

@@ -1,6 +1,6 @@
-package de.epiceric.shopchest;
+package de.epiceric.shopchest.command;
-
 
+import de.epiceric.shopchest.ShopChest;
 import org.bukkit.command.Command;
 import org.bukkit.command.CommandSender;
 import org.bukkit.command.TabCompleter;
@@ -22,7 +22,6 @@ class ShopTabCompleter implements TabCompleter {
     public List<String> onTabComplete(CommandSender sender, Command command, String label, String[] args) {
         if (command.getName().equalsIgnoreCase(plugin.getShopChestConfig().main_command_name)) {
 
-            List<String> subCommands = Arrays.asList("config", "create", "info", "limits", "open", "reload", "remove", "update");
             List<String> createSubCommands = Arrays.asList("admin", "normal");
             List<String> configSubCommands = Arrays.asList("add", "remove", "set");
             List<String> areaShopRemoveEvents = Arrays.asList("DELETE", "RESELL", "SELL", "UNRENT");
@@ -32,19 +31,7 @@ class ShopTabCompleter implements TabCompleter {
 
             ArrayList<String> returnCompletions = new ArrayList<>();
 
-            if (args.length == 1) {
+            if (args.length == 2) {
-                if (!args[0].equals("")) {
-                    for (String s : subCommands) {
-                        if (s.startsWith(args[0])) {
-                            returnCompletions.add(s);
-                        }
-                    }
-
-                    return returnCompletions;
-                } else {
-                    return subCommands;
-                }
-            } else if (args.length == 2) {
                 if (args[0].equals("config")) {
                     if (!args[1].equals("")) {
                         for (String s : configSubCommands) {