/**
* @param PluginInterface $plugin
* @param string $capability
* @throws \RuntimeException On empty or non-string implementation class name value
* @return null|string The fully qualified class of the implementation or null if Plugin is not of Capable type or does not provide it
*/
protected function getCapabilityImplementationClassName(PluginInterface $plugin, $capability)
{
if (!$plugin instanceof Capable) {
return null;
}
$capabilities = (array) $plugin->getCapabilities();
if (!empty($capabilities[$capability]) && is_string($capabilities[$capability]) && trim($capabilities[$capability])) {
return trim($capabilities[$capability]);
}
if (array_key_exists($capability, $capabilities) && (empty($capabilities[$capability]) || !is_string($capabilities[$capability]) || !trim($capabilities[$capability]))) {
throw new \UnexpectedValueException('Plugin ' . get_class($plugin) . ' provided invalid capability class name(s), got ' . var_export($capabilities[$capability], 1));
}
}
