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/*
* This file is part of helper, licensed under the MIT License.
*
* Copyright (c) lucko (Luck) <luck@lucko.me>
* Copyright (c) contributors
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
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);
}
}
private static Map<String, Command> getKnownCommandMap() {
try {
//noinspection unchecked
return (Map<String, Command>) KNOWN_COMMANDS_FIELD.get(getCommandMap());
} 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
* @param <T> the command executor class type
* @return the command executor
*/
public static <T extends CommandExecutor> T registerCommand(Plugin plugin, T command, String... aliases) {
Preconditions.checkArgument(aliases.length != 0, "No aliases");
for (String alias : aliases) {
try {
PluginCommand cmd = COMMAND_CONSTRUCTOR.newInstance(alias, plugin);
getCommandMap().register(plugin.getDescription().getName(), cmd);
Map<String, Command> knownCommandMap = getKnownCommandMap();
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();
}
}
return command;
}
/**
* Unregisters a CommandExecutor with the server
*
* @param command the command instance
* @param <T> the command executor class type
* @return the command executor
*/
public static <T extends CommandExecutor> T unregisterCommand(T command) {
CommandMap map = getCommandMap();
try {
//noinspection unchecked
Map<String, Command> knownCommands = (Map<String, Command>) KNOWN_COMMANDS_FIELD.get(map);
Iterator<Command> iterator = knownCommands.values().iterator();
while (iterator.hasNext()) {
Command cmd = iterator.next();
if (cmd instanceof PluginCommand) {
CommandExecutor executor = ((PluginCommand) cmd).getExecutor();
if (command == executor) {
cmd.unregister(map);
iterator.remove();
}
}
}
} catch (Exception e) {
throw new RuntimeException("Could not unregister command", e);
}
return command;
}
}
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