internal bool ProcessEvent(Node parentNode, TSuccessor successor)
{
var state = parentNode.State as TState;
var args = new StateExpansionEventArgs(state, successor, parentNode.Cost, parentNode.Depth);
OnSuccessorExpanded(this, args);
return(!args.CancelExpansion);
}
/// <summary>
/// Handles the <see cref="E:SuccessorExpanded" /> event.
/// </summary>
/// <param name="sender">The sender.</param>
/// <param name="e">The <see cref="StateExpansionEventArgs"/> instance containing the event data.</param>
protected virtual void OnSuccessorExpanded(object sender, StateExpansionEventArgs e)
{
EventHandler <StateExpansionEventArgs> handler = SuccessorExpanded;
if (handler != null)
{
handler(sender, e);
}
}
/// <summary>
/// Finds the specified initial state.
/// </summary>
/// <param name="initialState">The initial state.</param>
/// <returns><c>true</c> if XXXX, <c>false</c> otherwise.</returns>
public virtual bool Find(TState initialState)
{
if (Strategy == null)
{
return(false);
}
Strategy.Add(new Node(initialState));
while (Strategy.Count() > 0)
{
var n = Strategy.Remove();
if (n.Parent != null && n.Successor != null)
{
var eventArgs = new StateExpansionEventArgs(
(TState)n.Parent.State,
(TSuccessor)n.Successor,
n.Cost,
n.Depth);
OnSuccessorExpanded(this, eventArgs);
if (eventArgs.CancelExpansion)
{
return(false);
}
}
if (n.State.IsTerminal)
{
CreateSolution(n);
return(true);
}
foreach (var node in n.Expand(_closed))
{
Strategy.Add(node);
_closed?.Add(node.State);
}
}
return(false);
}
/// <summary>
/// Handles the <see cref="E:SuccessorExpanded" /> event.
/// </summary>
/// <param name="sender">The sender.</param>
/// <param name="e">The <see cref="StateExpansionEventArgs"/> instance containing the event data.</param>
protected virtual void OnSuccessorExpanded(object sender, StateExpansionEventArgs e)
{
EventHandler<StateExpansionEventArgs> handler = SuccessorExpanded;
if (handler != null)
handler(sender, e);
}
/// <summary>
/// Handles the <see cref="E:SuccessorExpanded" /> event.
/// </summary>
/// <param name="sender">The sender.</param>
/// <param name="e">The <see cref="StateExpansionEventArgs" /> instance containing the event data.</param>
protected virtual void OnSuccessorExpanded(object sender, StateExpansionEventArgs e)
{
var handler = SuccessorExpanded;
handler?.Invoke(sender, e);
}
