public static dynamic LastSteps(LastStepParams parameters)
{
var method = parameters.ExecutionParameters.Method;
var zoom = parameters.ExecutionParameters.Zoom;
var graph = parameters.Graph;
if (zoom.IsSet() && !zoom.IsFlat())
{
graph = parameters.CacheService.GetMonitored(
parameters.GraphDescriptor,
MakeCacheKey(parameters.BaseCacheKey + ".ZoomedGraph", parameters.ExecutionParameters, true),
() => parameters.GraphEditor.CreateZoomedGraph(graph, zoom.Level, zoom.Count));
}
switch (method)
{
case ExecutionMethod.NodeCount:
return graph.VertexCount;
case ExecutionMethod.ConnectionCount:
return graph.EdgeCount;
case ExecutionMethod.ZoomLevelCount:
return parameters.CacheService.GetMonitored(
parameters.GraphDescriptor, MakeCacheKey(parameters.BaseCacheKey + ".ZoomLevelCount", parameters.ExecutionParameters, true),
() => parameters.GraphEditor.CalculateZoomLevelCount(graph, zoom.Count));
case ExecutionMethod.ToGraph:
return graph;
default:
return QueryableGraph.ThrowNotSupported(method);
}
}
public static dynamic LastStepsWithPaging(LastStepParams parameters)
{
var paging = parameters.ExecutionParameters.Paging;
if (paging.SkipConnections != 0 || paging.TakeConnections < parameters.Graph.EdgeCount)
{
var graph = parameters.Graph;
var pagedGraph = parameters.GraphEditor.GraphFactory<int>();
pagedGraph.AddVerticesAndEdgeRange(graph.Edges
.OrderByDescending(edge => Math.Min(graph.AdjacentDegree(edge.Source), graph.AdjacentDegree(edge.Target)))
.Skip(paging.SkipConnections)
.Take(paging.TakeConnections));
parameters.Graph = pagedGraph;
}
return LastSteps(parameters);
}
