/**
* Creates lookup keys for configuration data.
*
* @param \Drupal\Core\Config\Config $config
* The configuration object.
* @param string $key
* The configuration key to look for.
* @param string $get_method
* Which method on the config object to call to get the value. Either 'get'
* or 'getOriginal'.
* @param \Drupal\Core\Config\Entity\ConfigEntityTypeInterface $entity_type
* The configuration entity type.
*
* @return array
* An array of lookup keys concatenated to the configuration values.
*
* @throws \Drupal\Core\Config\Entity\Query\InvalidLookupKeyException
* The provided $key cannot end with a wildcard. This makes no sense since
* you cannot do fast lookups against this.
*/
protected function getKeys(Config $config, $key, $get_method, ConfigEntityTypeInterface $entity_type)
{
if (substr($key, -1) == '*') {
throw new InvalidLookupKeyException(strtr('%entity_type lookup key %key ends with a wildcard this can not be used as a lookup', ['%entity_type' => $entity_type->id(), '%key' => $key]));
}
$parts = explode('.*', $key);
// Remove leading dots.
array_walk($parts, function (&$value) {
$value = trim($value, '.');
});
$values = (array) $this->getValues($config, $parts[0], $get_method, $parts);
$output = array();
// Flatten the array to a single dimension and add the key to all the
// values.
array_walk_recursive($values, function ($current) use(&$output, $key) {
if (is_scalar($current)) {
$current = $key . ':' . $current;
}
$output[] = $current;
});
return $output;
}
