public string ToJsonDiff(GridState previous)
{
return string.Format("[{0}{1}]", jsonString(Description),
string.Join("", Cells.Select((c,i) => c.ToJsonDiff(previous.Cells[i], i))
.Where(s => s != null)
.Select(s => "," + s))
);
}
public bool HasChanged(GridState previous)
{
for (var i=0; i<81; i++) {
if(Cells[i].Value != previous.Cells[i].Value || !Cells[i].Possibilities.SetEquals(previous.Cells[i].Possibilities))
return true;
}
return false;
}
/// <summary>
/// Loads the grid from an existing <see cref="GridState"/>.
/// </summary>
public void LoadState(GridState state)
{
for(var i=0;i<81;i++) {
Cells[i].LoadState(state.Cells[i]);
}
}
/// <summary>
/// Saves the current grid into a <see cref="GridState"/> using a particular description.
/// </summary>
public GridState SaveState(string description)
{
GridState state = new GridState
{
Description = description,
Cells = new CellState[81]
};
for (var i=0; i<81; i++) {
state.Cells[i] = Cells[i].SaveState();
}
return state;
}
public void Add(GridState state)
{
States.Add(state);
}