/**
* Visits the node, checks contraints and calls verify on each node.
*
* Returns true if the node was verified. False if it was already
* verified.
*
* @param ezcWorkflowVisitable $visitable
* @throws ezcWorkflowInvalidWorkflowException
* @return boolean
*/
public function visit(ezcWorkflowVisitable $visitable)
{
if ($visitable instanceof ezcWorkflow) {
foreach ($visitable->nodes as $node) {
if ($node instanceof ezcWorkflowNodeStart && !$node instanceof ezcWorkflowNodeFinally) {
$this->numStartNodes++;
if ($this->numStartNodes > 1) {
throw new ezcWorkflowInvalidWorkflowException('A workflow may have only one start node.');
}
}
if ($node instanceof ezcWorkflowNodeFinally) {
$this->numFinallyNodes++;
if ($this->numFinallyNodes > 1) {
throw new ezcWorkflowInvalidWorkflowException('A workflow may have only one finally node.');
}
}
}
}
if ($visitable instanceof ezcWorkflowNode) {
$id = $visitable->getId();
if (isset($this->visited[$id])) {
return false;
}
$this->visited[$id] = true;
$visitable->verify();
}
return true;
}
/**
* Perform the visit.
*
* @param ezcWorkflowVisitable $visitable
*/
protected function doVisit(ezcWorkflowVisitable $visitable)
{
if ($visitable instanceof ezcWorkflow) {
foreach ($visitable->nodes as $node) {
if ($node instanceof ezcWorkflowNodeStart && !$node instanceof ezcWorkflowNodeFinally) {
$this->numStartNodes++;
if ($this->numStartNodes > 1) {
throw new ezcWorkflowInvalidWorkflowException('A workflow may have only one start node.');
}
}
if ($node instanceof ezcWorkflowNodeFinally) {
$this->numFinallyNodes++;
if ($this->numFinallyNodes > 1) {
throw new ezcWorkflowInvalidWorkflowException('A workflow may have only one finally node.');
}
}
}
}
if ($visitable instanceof ezcWorkflowNode) {
$visitable->verify();
}
}
