public void BeginCompoundDo(int pointerIndex)
{
if (tempMemento != null)
{
throw new InvalidOperationException("Previous complex memento wasn't commited.");
}
tempMemento = new CompoundListMemento <T, U>(pointerIndex);
}
public void EndCompoundDo()
{
if (tempMemento == null)
{
throw new InvalidOperationException("Ending a non-existing complex memento");
}
_Do(tempMemento);
tempMemento = null;
}
public CompoundListMemento <T, U> Restore(T target)
{
CompoundListMemento <T, U> inverse = new CompoundListMemento <T, U>(pointerIndex);
//starts from the last action
for (int i = mementos.Count - 1; i >= 0; i--)
{
inverse.Add(mementos[i].Restore(target));
}
return(inverse);
}