/**
* Creates a CacheableMetadata object from a depended object.
*
* @param \Drupal\Core\Cache\CacheableDependencyInterface|mixed $object
* The object whose cacheability metadata to retrieve. If it implements
* CacheableDependencyInterface, its cacheability metadata will be used,
* otherwise, the passed in object must be assumed to be uncacheable, so
* max-age 0 is set.
*
* @return static
*/
public static function createFromObject($object)
{
if ($object instanceof CacheableDependencyInterface) {
$meta = new static();
$meta->cacheContexts = $object->getCacheContexts();
$meta->cacheTags = $object->getCacheTags();
$meta->cacheMaxAge = $object->getCacheMaxAge();
return $meta;
}
// Objects that don't implement CacheableDependencyInterface must be assumed
// to be uncacheable, so set max-age 0.
$meta = new static();
$meta->cacheMaxAge = 0;
return $meta;
}
/**
* Adds a dependency on an object: merges its cacheability metadata.
*
* @param \Drupal\Core\Cache\CacheableDependencyInterface|object $other_object
* The dependency. If the object implements CacheableDependencyInterface,
* then its cacheability metadata will be used. Otherwise, the passed in
* object must be assumed to be uncacheable, so max-age 0 is set.
*
* @return $this
*/
public function addCacheableDependency($other_object)
{
if ($other_object instanceof CacheableDependencyInterface) {
$this->contexts = Cache::mergeContexts($this->contexts, $other_object->getCacheContexts());
$this->tags = Cache::mergeTags($this->tags, $other_object->getCacheTags());
$this->maxAge = Cache::mergeMaxAges($this->maxAge, $other_object->getCacheMaxAge());
} else {
$this->maxAge = 0;
}
return $this;
}