Examples with NoStartNodeException de.hpi.bpt.scylla.model.process.graph.exception.NoStartNodeException used on opensource projects

Example 6 with NoStartNodeException

use of de.hpi.bpt.scylla.model.process.graph.exception.NoStartNodeException in project scylla by bptlab.

the class ProcessModel method getStartNode.

/**
 * Returns start node of the process model (i.e. which does not have any predecessors).
 *
 * @return graph node id of start node
 * @throws NodeNotFoundException
 * @throws MultipleStartNodesException
 * @throws NoStartNodeException
 */
public Integer getStartNode() throws NodeNotFoundException, MultipleStartNodesException, NoStartNodeException {
    Set<Integer> nodesWithoutSource = graph.getNodesWithoutSource();
    Set<Integer> boundaryEventIds = getBoundaryEventIds();
    nodesWithoutSource.removeAll(boundaryEventIds);
    if (nodesWithoutSource.size() > 1) {
        throw new MultipleStartNodesException("Multiple start nodes found for process " + id);
    } else if (nodesWithoutSource.size() == 0) {
        throw new NoStartNodeException("No start node found for process " + id);
    }
    return nodesWithoutSource.iterator().next();
}