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<?php
/*
* This file is part of the Symfony package.
*
* (c) Fabien Potencier <fabien@symfony.com>
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
namespace Symfony\Component\Workflow\Validator;
use Symfony\Component\Workflow\Definition;
use Symfony\Component\Workflow\Exception\InvalidDefinitionException;
/**
* @author Tobias Nyholm <tobias.nyholm@gmail.com>
*/
class StateMachineValidator implements DefinitionValidatorInterface
{
public function validate(Definition $definition, $name)
{
$transitionFromNames = [];
foreach ($definition->getTransitions() as $transition) {
// Make sure that each transition has exactly one TO
if (1 !== \count($transition->getTos())) {
throw new InvalidDefinitionException(sprintf('A transition in StateMachine can only have one output. But the transition "%s" in StateMachine "%s" has %d outputs.', $transition->getName(), $name, \count($transition->getTos())));
}
// Make sure that each transition has exactly one FROM
$froms = $transition->getFroms();
if (1 !== \count($froms)) {
throw new InvalidDefinitionException(sprintf('A transition in StateMachine can only have one input. But the transition "%s" in StateMachine "%s" has %d inputs.', $transition->getName(), $name, \count($froms)));
}
// Enforcing uniqueness of the names of transitions starting at each node
$from = reset($froms);
if (isset($transitionFromNames[$from][$transition->getName()])) {
throw new InvalidDefinitionException(sprintf('A transition from a place/state must have an unique name. Multiple transitions named "%s" from place/state "%s" were found on StateMachine "%s".', $transition->getName(), $from, $name));
}
$transitionFromNames[$from][$transition->getName()] = true;
}
}
}