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<?php
namespace Drupal\workflows;
/**
* A value object representing a workflow state.
*
* @internal
* The workflow system is currently experimental and should only be leveraged
* by experimental modules and development releases of contributed modules.
*/
class State implements StateInterface {
/**
* The workflow the state is attached to.
*
* @var \Drupal\workflows\WorkflowInterface
*/
protected $workflow;
/**
* The state's ID.
*
* @var string
*/
protected $id;
/**
* The state's label.
*
* @var string
*/
protected $label;
/**
* The state's weight.
*
* @var int
*/
protected $weight;
/**
* State constructor.
*
* @param \Drupal\workflows\WorkflowInterface $workflow
* The workflow the state is attached to.
* @param string $id
* The state's ID.
* @param string $label
* The state's label.
* @param int $weight
* The state's weight.
*/
public function __construct(WorkflowInterface $workflow, $id, $label, $weight = 0) {
$this->workflow = $workflow;
$this->id = $id;
$this->label = $label;
$this->weight = $weight;
}
/**
* {@inheritdoc}
*/
public function id() {
return $this->id;
}
/**
* {@inheritdoc}
*/
public function label() {
return $this->label;
}
/**
* {@inheritdoc}
*/
public function weight() {
return $this->weight;
}
/**
* {@inheritdoc}
*/
public function canTransitionTo($to_state_id) {
return $this->workflow->hasTransitionFromStateToState($this->id, $to_state_id);
}
/**
* {@inheritdoc}
*/
public function getTransitionTo($to_state_id) {
if (!$this->canTransitionTo($to_state_id)) {
throw new \InvalidArgumentException("Can not transition to '$to_state_id' state");
}
return $this->workflow->getTransitionFromStateToState($this->id(), $to_state_id);
}
/**
* {@inheritdoc}
*/
public function getTransitions() {
return $this->workflow->getTransitionsForState($this->id);
}
/**
* Helper method to convert a list of states to labels
*
* @param \Drupal\workflows\StateInterface $state
*
* @return string
* The label of the state.
*/
public static function labelCallback(StateInterface $state) {
return $state->label();
}
}