реализация CommandService

src/main/java/mc/server/shell/CommandServiceImpl.java

@@ -0,0 +1,51 @@
+package mc.server.shell;
+
+import org.jline.builtins.Builtins;
+import org.jline.builtins.Builtins.CommandMethods;
+import org.jline.builtins.Completers.SystemCompleter;
+import org.jline.reader.impl.completer.NullCompleter;
+
+import java.util.Collections;
+import java.util.HashMap;
+import java.util.Map;
+import java.util.Set;
+
+public class CommandServiceImpl implements CommandService {
+
+    private final Map<String, CommandMethods> commands = new HashMap<>();
+
+    public void register(String commandName, Command command) {
+        commands.put(commandName, new CommandMethods(
+                command::execute,
+                cmdName -> Collections.singletonList(NullCompleter.INSTANCE)
+        ));
+    }
+
+    public void execute(CommandSession session, String commandName) {
+        commands.get(commandName).execute().accept(new Builtins.CommandInput(commandName, new Object[0], session));
+    }
+
+    @Override
+    public Set<String> commandNames() {
+        return commands.keySet();
+    }
+
+    @Override
+    public Map<String, String> commandAliases() {
+        return Collections.emptyMap();
+    }
+
+    @Override
+    public boolean hasCommand(String commandName) {
+        return commands.containsKey(commandName);
+    }
+
+    @Override
+    public SystemCompleter compileCompleters() {
+        final SystemCompleter systemCompleter = new SystemCompleter();
+        systemCompleter.addAliases(commandAliases());
+        commands.forEach((commandName, command) -> systemCompleter.add(commandName, NullCompleter.INSTANCE));
+
+        return systemCompleter;
+    }
+}