Use annotations to register commands

EssentialsExtra/src/Commandkittycannon.java

@@ -2,11 +2,13 @@
 import java.util.Random;
 import net.ess3.api.IUser;
 import net.ess3.commands.EssentialsCommand;
+import net.ess3.extra.AnnotatedCommand;
 import org.bukkit.Location;
 import org.bukkit.entity.EntityType;
 import org.bukkit.entity.Ocelot;
 
 
+@AnnotatedCommand(description = "Throw an exploding kitten at your opponent", usage = "/<command>")
 public class Commandkittycannon extends EssentialsCommand
 {
 	private static Random random = new Random();

EssentialsExtra/src/net/ess3/extra/EssentialsExtra.java

@@ -2,11 +2,12 @@ package net.ess3.extra;
 
 import java.io.File;
 import java.io.FileOutputStream;
-import java.io.IOException;
 import java.io.InputStream;
 import java.io.OutputStream;
+import java.lang.reflect.Field;
 import java.net.URL;
 import java.net.URLClassLoader;
+import java.util.Arrays;
 import java.util.Enumeration;
 import java.util.jar.JarEntry;
 import java.util.jar.JarFile;
@@ -15,8 +16,12 @@ import net.ess3.api.ICommandHandler;
 import net.ess3.api.IEssentials;
 import net.ess3.bukkit.BukkitPlugin;
 import net.ess3.commands.EssentialsCommandHandler;
+import org.bukkit.Bukkit;
 import org.bukkit.command.Command;
+import org.bukkit.command.CommandMap;
 import org.bukkit.command.CommandSender;
+import org.bukkit.plugin.PluginManager;
+import org.bukkit.plugin.SimplePluginManager;
 import org.bukkit.plugin.java.JavaPlugin;
 
 
@@ -24,6 +29,8 @@ public class EssentialsExtra extends JavaPlugin
 {
 	private IEssentials ess;
 	private ICommandHandler handler;
+	private CommandMap commandMap;
+	private ClassLoader loader;
 
 	@Override
 	public void onEnable()
@@ -35,6 +42,11 @@ public class EssentialsExtra extends JavaPlugin
 		URL[] urls = null;
 		try
 		{
+			PluginManager pm = Bukkit.getServer().getPluginManager();
+			Field f = SimplePluginManager.class.getDeclaredField("commandMap");
+			f.setAccessible(true);
+			CommandMap map = (CommandMap)f.get(pm);
+
 			JarFile jar = new JarFile(getFile());
 			Enumeration<JarEntry> entries = jar.entries();
 			while (entries.hasMoreElements())
@@ -64,28 +76,49 @@ public class EssentialsExtra extends JavaPlugin
 				commandDir.toURI().toURL()
 			};
 		}
-		catch (IOException ex)
+		catch (Exception ex)
 		{
-			getLogger().log(Level.SEVERE, "Could not get extra command dir", ex);
+			getLogger().log(Level.SEVERE, "Enable " + getName(), ex);
 			getServer().getPluginManager().disablePlugin(this);
 		}
 
+		loader = new URLClassLoader(urls, getClassLoader());
+
 		for (File file : commandDir.listFiles())
 		{
 			String name = file.getName();
 			if (name.startsWith("Command") && name.endsWith(".class"))
 			{
-				getLogger().info("Loaded command " + name.substring(0, name.length() - 7));
+				try
+				{
+					registerCommand(name);
+					getLogger().info("Loaded command " + name.substring(0, name.length() - 7));
+				}
+				catch (Exception ex)
+				{
+					getLogger().log(Level.SEVERE, "Could not register " + name, ex);
+				}
 			}
 		}
 
-		ClassLoader loader = new URLClassLoader(urls, getClassLoader());
 		handler = new EssentialsCommandHandler(loader, "Command", "essentials.", ess);
 	}
 
-	@Override
-	public boolean onCommand(CommandSender sender, Command command, String label, String[] args)
+	private void registerCommand(String name) throws ClassNotFoundException, IllegalAccessException, IllegalArgumentException, NoSuchFieldException, SecurityException
 	{
-		return handler.handleCommand(sender, command, label, args);
+
+		AnnotatedCommand anot = Class.forName(name).getAnnotation(AnnotatedCommand.class);
+		if (anot == null)
+		{
+			throw new IllegalArgumentException("Command class is not annotated with AnnotatedCommand.class");
+		}
+		commandMap.register("Essentials", new Command(name.substring(0, name.length() - 7), anot.description(), anot.usage(), Arrays.asList(anot.aliases()))
+		{
+			@Override
+			public boolean execute(CommandSender cs, String label, String[] args)
+			{
+				return handler.handleCommand(cs, this, label, args);
+			}
+		});
 	}
 }

EssentialsExtra/src/plugin.yml

@@ -7,7 +7,3 @@ website: http://tiny.cc/EssentialsWiki
 description: Provides extra commands for Essentials
 authors: [md_5]
 depend: [Essentials-3]
-commands:
-  kittycannon:
-    description: Throw an exploding kitten at your opponent
-    usage: /<command>