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/*
* This file is part of spark.
*
* Copyright (c) lucko (Luck) <luck@lucko.me>
* Copyright (c) contributors
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package me.lucko.spark.bukkit;
import com.google.common.base.Preconditions;
import org.bukkit.Bukkit;
import org.bukkit.command.Command;
import org.bukkit.command.CommandExecutor;
import org.bukkit.command.CommandMap;
import org.bukkit.command.PluginCommand;
import org.bukkit.command.SimpleCommandMap;
import org.bukkit.command.TabCompleter;
import org.bukkit.plugin.Plugin;
import org.bukkit.plugin.SimplePluginManager;
import java.lang.reflect.Constructor;
import java.lang.reflect.Field;
import java.util.Iterator;
import java.util.Map;
/**
* Utility for interacting with the server's {@link CommandMap} instance.
*/
enum CommandMapUtil {
;
private static final Constructor<PluginCommand> COMMAND_CONSTRUCTOR;
private static final Field COMMAND_MAP_FIELD;
private static final Field KNOWN_COMMANDS_FIELD;
static {
try {
COMMAND_CONSTRUCTOR = PluginCommand.class.getDeclaredConstructor(String.class, Plugin.class);
COMMAND_CONSTRUCTOR.setAccessible(true);
COMMAND_MAP_FIELD = SimplePluginManager.class.getDeclaredField("commandMap");
COMMAND_MAP_FIELD.setAccessible(true);
KNOWN_COMMANDS_FIELD = SimpleCommandMap.class.getDeclaredField("knownCommands");
KNOWN_COMMANDS_FIELD.setAccessible(true);
} catch (NoSuchMethodException | NoSuchFieldException e) {
throw new ExceptionInInitializerError(e);
}
}
private static CommandMap getCommandMap() {
try {
return (CommandMap) COMMAND_MAP_FIELD.get(Bukkit.getServer().getPluginManager());
} catch (Exception e) {
throw new RuntimeException("Could not get CommandMap", e);
}
}
@SuppressWarnings("unchecked")
private static Map<String, Command> getKnownCommandMap(CommandMap commandMap) {
try {
return (Map<String, Command>) KNOWN_COMMANDS_FIELD.get(commandMap);
} catch (Exception e) {
throw new RuntimeException("Could not get known commands map", e);
}
}
/**
* Registers a CommandExecutor with the server
*
* @param plugin the plugin instance
* @param command the command instance
* @param aliases the command aliases
*/
public static void registerCommand(Plugin plugin, CommandExecutor command, String... aliases) {
Preconditions.checkArgument(aliases.length != 0, "No aliases");
CommandMap commandMap = getCommandMap();
Map<String, Command> knownCommandMap = getKnownCommandMap(commandMap);
for (String alias : aliases) {
try {
PluginCommand cmd = COMMAND_CONSTRUCTOR.newInstance(alias, plugin);
commandMap.register(plugin.getDescription().getName(), cmd);
knownCommandMap.put(plugin.getDescription().getName().toLowerCase() + ":" + alias.toLowerCase(), cmd);
knownCommandMap.put(alias.toLowerCase(), cmd);
cmd.setLabel(alias.toLowerCase());
cmd.setExecutor(command);
if (command instanceof TabCompleter) {
cmd.setTabCompleter((TabCompleter) command);
}
} catch (Exception e) {
e.printStackTrace();
}
}
}
/**
* Unregisters a CommandExecutor with the server
*
* @param command the command instance
*/
public static void unregisterCommand(CommandExecutor command) {
CommandMap commandMap = getCommandMap();
Map<String, Command> knownCommandMap = getKnownCommandMap(commandMap);
Iterator<Command> iterator = knownCommandMap.values().iterator();
while (iterator.hasNext()) {
Command cmd = iterator.next();
if (cmd instanceof PluginCommand) {
CommandExecutor executor = ((PluginCommand) cmd).getExecutor();
if (command == executor) {
cmd.unregister(commandMap);
iterator.remove();
}
}
}
}
}
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