/// <summary>
/// Return true if the edge could be traversed, false otherwise.
/// This valutation is done having the previous node (filled)
/// </summary>
/// <param name="previousNode"></param>
/// <returns>Control </returns>
internal bool VerifyPrecondition(WFnode previousNode)
{
if (EdgeLabelInterpreter.InterpretPreconditions(previousNode.Value, preconditions.DocumentElement))
{
return(true);
}
return(false);
}
private string informativeIsValid()
{
/*Every node is valid...itself*/
foreach (WFnode wnd in connectionGraph.Nodes)
{
if (!wnd.isValid)
{
try
{
return("The editor you are using pass me some invalid datas for node " + wnd.Name);
}
catch
{
return("The editor you are using pass me some invalid datas for a node");
}
}
}
if (!findInitialAndFinalNodes())
{
return("No Initial node or no recognized final nodes in workflow");
}
/*Initial should be really initial*/
if (connectionGraph.GetIncomingEdges(initialNode).Count != 0)
{
return("Initial node has incoming edges");
}
/*Each node should be reached from initial node*/
Stack <WFnode> stack = new Stack <WFnode>();
HashSet <WFnode> visited = new HashSet <WFnode>();
HashSet <WFnode> nodeInStack = new HashSet <WFnode>();
stack.Push(initialNode);
nodeInStack.Add(initialNode);
visited.Add(initialNode);
WFnode popped = null;
while (stack.Count > 0)
{
WFnode top = stack.Peek();
List <WFnode> lst = connectionGraph.getOutcomingNodes(top);
if (lst.Count > 0)
{
if (popped != null)
{
int num = lst.IndexOf(popped);
if (num + 1 < lst.Count)
{
if (nodeInStack.Contains(lst[num + 1]))
{
return("Workflow contains cycle");
}
nodeInStack.Add(lst[num + 1]);
stack.Push(lst[num + 1]);
visited.Add(lst[num + 1]);
}
else
{
popped = stack.Pop();
nodeInStack.Remove(popped);
}
}
else
{
if (stack.Contains(lst[0]))
{
return("Workflow contains cycle");
}
nodeInStack.Add(lst[0]);
stack.Push(lst[0]);
visited.Add(lst[0]);
}
}
else
{
popped = stack.Pop();
nodeInStack.Remove(popped);
}
}
if (visited.Count != connectionGraph.Nodes.Count)
{
return("Not all nodes could be reached from initial node");
}
try
{
XmlSchemaSet resSchema = new XmlSchemaSet();
resSchema.Add(Fields.FieldsManager.FieldTypesXSD);
foreach (WFnode nd in connectionGraph.Nodes)
{
resSchema.Add(nd.GetNodeSchemasWithoutBaseTypes());
}
resSchema.Compile();
}
catch (Exception err)
{
return("Problems with nodes schemas:\n\n" + err.Message);
}
/*Verify edge precondition*/
foreach (WFedgeLabel edg in connectionGraph.Edges)
{
var tr = connectionGraph.GetConnectingNodes(edg);
if (!EdgeLabelInterpreter.VerifyPreconditionsCorrectness(tr.SecondMember.GetNodeSchemas(), XmlConvert.EncodeLocalName(tr.SecondMember.NodeTypeName), edg.GetPrecondition().FirstChild))
{
return("The edge between " + XmlConvert.EncodeLocalName(tr.SecondMember.NodeTypeName) + " and " + XmlConvert.EncodeLocalName(tr.ThirdMember.NodeTypeName) + " contains wrong preconditions");
}
}
return(null);
}