package class7_3_RemoteControl_inClass.other;

import java.util.*;

/**
 * This is a "helper" class that handles the details of invocation of specific commands
 * @author hornick
 *
 */
public class Invoker {
	List<Command> doneCommands = new ArrayList<>();

	/**
	 * constructor
	 */
	public Invoker() {
	}

	/**
	 * tells this to execute its Command immediately
	 */
	public boolean invoke( Command command ) {
		Thread worker = new Thread(()->command.execute());
		worker.start();
		doneCommands.add(command);
		return true;
	}

	/**
	 * tells this to undo the last Command (if possible)
	 */
	public boolean undo() {
		Command lastCommand = doneCommands.remove(doneCommands.size()-1);
		lastCommand.unexecute();
		return true;
	}

}