Kontakte/src/kontakte/controller/CommandInvoker.java

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package kontakte.controller;

import java.awt.Component;
import java.util.HashMap;
import java.util.Stack;

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