CommandManager.java

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package com.example.graphics.command;
 
import java.util.Stack;

public class CommandManager {
    private final Stack<Command> undoStack;
    private final Stack<Command> redoStack;
    
    public CommandManager() {
        undoStack = new Stack<>();
        redoStack = new Stack<>();
    }
    
    public void executeCommand(Command command) {
        command.execute();
        undoStack.push(command);
        redoStack.clear(); // Clear redo stack when a new command is executed
    }
    
    public boolean undo() {
        if (undoStack.isEmpty()) {
            return false;
        }
        
        Command command = undoStack.pop();
        command.undo();
        redoStack.push(command);
        return true;
    }
    
    public boolean redo() {
        if (redoStack.isEmpty()) {
            return false;
        }
        
        Command command = redoStack.pop();
        command.execute();
        undoStack.push(command);
        return true;
    }
    
    public boolean canUndo() {
        return !undoStack.isEmpty();
    }
    
    public boolean canRedo() {
        return !redoStack.isEmpty();
    }
    
    public void clearHistory() {
        undoStack.clear();
        redoStack.clear();
    }
}