Changed the Runnable to a Command

src/main/java/net/minecraft/commands/tree/ArgumentCommandNode.java

@@ -1,5 +1,6 @@
 package net.minecraft.commands.tree;
 
+import net.minecraft.commands.Command;
 import net.minecraft.commands.arguments.CommandArgumentType;
 import net.minecraft.commands.context.ParsedArgument;
 import net.minecraft.commands.exceptions.ArgumentValidationException;
@@ -9,8 +10,8 @@ public class ArgumentCommandNode<T> extends CommandNode {
     private final String name;
     private final CommandArgumentType<T> type;
 
-    public ArgumentCommandNode(String name, CommandArgumentType<T> type, Runnable executor) {
-        super(executor);
+    public ArgumentCommandNode(String name, CommandArgumentType<T> type, Command command) {
+        super(command);
         this.name = name;
         this.type = type;
     }

src/main/java/net/minecraft/commands/tree/CommandNode.java

@@ -1,21 +1,22 @@
 package net.minecraft.commands.tree;
 
 import com.google.common.collect.Lists;
+import net.minecraft.commands.Command;
 import net.minecraft.commands.exceptions.ArgumentValidationException;
 import net.minecraft.commands.exceptions.IllegalArgumentSyntaxException;
 
 import java.util.List;
 
 public abstract class CommandNode {
-    private final Runnable executor;
+    private final Command command;
     private final List<CommandNode> children = Lists.newArrayList();
 
-    protected CommandNode(Runnable executor) {
-        this.executor = executor;
+    protected CommandNode(Command command) {
+        this.command = command;
     }
 
-    public Runnable getExecutor() {
-        return executor;
+    public Command getCommand() {
+        return command;
     }
 
     public List<CommandNode> getChildren() {

src/main/java/net/minecraft/commands/tree/LiteralCommandNode.java

@@ -1,13 +1,14 @@
 package net.minecraft.commands.tree;
 
+import net.minecraft.commands.Command;
 import net.minecraft.commands.exceptions.ArgumentValidationException;
 import net.minecraft.commands.exceptions.IllegalArgumentSyntaxException;
 
 public class LiteralCommandNode extends CommandNode {
     private final String literal;
 
-    public LiteralCommandNode(String literal, Runnable executor) {
-        super(executor);
+    public LiteralCommandNode(String literal, Command command) {
+        super(command);
         this.literal = literal;
     }