/// <summary>
/// Search up a tree of nodes looking for a node which can answer a given question.
/// </summary>
/// <typeparam name="TResult">The type of the result</typeparam>
/// <typeparam name="TNode">The type of the intermediate node which can answer the question</typeparam>
/// <param name="start">The node to start at</param>
/// <param name="queryNode">Take an intermediate node and produce a result</param>
/// <param name="stopTypes">A set of types to stop at if encountered and cancel the search</param>
/// <returns></returns>
public static TResult SearchUp <TResult, TNode>(this ISubdivisionContext start, Func <TNode, TResult> queryNode, params Type[] stopTypes)
where TResult : class
where TNode : class
{
Contract.Requires(start != null);
Contract.Requires(queryNode != null);
Contract.Requires(stopTypes != null);
ISubdivisionContext node = start.Parent;
while (node != null)
{
//Once we find a provider take suggestions from it
var p = node as TNode;
if (p != null)
{
var f = queryNode(p);
return(f);
}
// ReSharper disable AccessToModifiedClosure
if (stopTypes.Any(t => t.IsInstanceOfType(node)))
{
// ReSharper restore AccessToModifiedClosure
break;
}
//Search further up
node = node.Parent;
}
//Found nothing
return(null);
}
public NeighbourInfo(ISubdivisionContext neighbour, LineSegment2 neighbourSegment, float neighbourStart, float neighbourEnd, LineSegment2 segment, float start, float end)
{
Neighbour = neighbour;
NeighbourSegment = neighbourSegment;
NeighbourStart = neighbourStart;
NeighbourEnd = neighbourEnd;
Segment = segment;
Start = start;
End = end;
}
private KeyValuePair <float, BuildingSideInfo.NeighbourInfo.Resource[]> ExtractDataFromUnknownNode(ISubdivisionContext neighbour)
{
#region fields
//Wouldn't it be great if we were using C#7 and we could use a match statement on type...
//...Instead we're going to hide the dirty details in here
IBuildingContainer ibc;
IRoad ir;
#endregion
if ((ibc = neighbour as IBuildingContainer) != null)
{
return(new KeyValuePair <float, BuildingSideInfo.NeighbourInfo.Resource[]>(ibc.Height, new BuildingSideInfo.NeighbourInfo.Resource[0]));
}
else if ((ir = neighbour as IRoad) != null)
{
return(new KeyValuePair <float, BuildingSideInfo.NeighbourInfo.Resource[]>(0, new BuildingSideInfo.NeighbourInfo.Resource[] {
new BuildingSideInfo.NeighbourInfo.Resource(0, 0, "road")
}));
}
return(new KeyValuePair <float, BuildingSideInfo.NeighbourInfo.Resource[]>(0, new BuildingSideInfo.NeighbourInfo.Resource[0]));
}
void ISubdivisionContext.AddPrerequisite(ISubdivisionContext prerequisite, bool recursive)
{
}
