private NodeType GetNodeType(IGraphProcessingEnvironment procEnv, SequenceExpression AdjacentNodeType)
{
NodeType nodeType = null;
if(AdjacentNodeType != null)
{
object tmp = AdjacentNodeType.Evaluate(procEnv);
if(tmp is string) nodeType = procEnv.Graph.Model.NodeModel.GetType((string)tmp);
else if(tmp is NodeType) nodeType = (NodeType)tmp;
if(nodeType == null) throw new Exception("node type argument to " + FunctionSymbol + " iteration is not a node type");
}
else
{
nodeType = procEnv.Graph.Model.NodeModel.RootType;
}
return nodeType;
}
private EdgeType GetEdgeType(IGraphProcessingEnvironment procEnv, SequenceExpression IncidentEdgeType)
{
EdgeType edgeType = null;
if(IncidentEdgeType != null)
{
object tmp = IncidentEdgeType.Evaluate(procEnv);
if(tmp is string) edgeType = procEnv.Graph.Model.EdgeModel.GetType((string)tmp);
else if(tmp is EdgeType) edgeType = (EdgeType)tmp;
if(edgeType == null) throw new Exception("edge type argument to " + FunctionSymbol + " iteration is not an edge type");
}
else
{
edgeType = procEnv.Graph.Model.EdgeModel.RootType;
}
return edgeType;
}