/**
  * {@inheritdoc}
  */
 public function addCondition($condition_id, ContextConfig $config = NULL)
 {
     return $this->addExpressionObject($this->expressionManager->createCondition($condition_id)->setConfiguration($config ? $config->toArray() : []));
 }
 /**
  * {@inheritdoc}
  */
 public function addExpression($plugin_id, ContextConfig $config = NULL)
 {
     return $this->addExpressionObject($this->expressionManager->createInstance($plugin_id, $config ? $config->toArray() : []));
 }