How to add multi multiplicity to mxgraph nodes?

Question

I'm using mxgraph for bpmn workflow in my web application. So I need state some rules for nodes. For example:

1. Start node has no input.
2. Start node has just one output to others except notification node.
3. Start node has 0 ore more out put to notification node.

I can't specify this state with multiplicity. How should I do it?

Answer 1

Put domain info into cells' values. Override mxGraph#validateEdge, implement your rules there based on source and target cells' values (alternatively override mxGraph#isValidConnection if you don't care about providing a error message).