grafik2d/src/controller/CommandInvoker.java

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package controller;

import java.util.HashMap;
import java.util.Stack;

/**
 *
 * @author nobody
 */
public class CommandInvoker
{ 
  
  private HashMap<Object, CommandInterface> commands;
  private Stack<CommandInterface> undoStack; 
  
  public CommandInvoker()
  {
    commands = new HashMap<>();
    undoStack = new Stack<>();
  }
  
  public void addCommand(Object key,CommandInterface value)
  {
    commands.put(key,value);
  }
  
  public void executeCommand(Object key)
  {
    commands.get(key).execute();
    if (false)
    {
      undoStack.push(commands.get(key));
    }
  }
  
  public void undoCommand()
  {
    if(!undoStack.isEmpty())
    {
      undoStack.pop().undo();
    }
  }
}