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<?php
namespace Drupal\Core\Cache;
/**
* Defines a generic class for passing cacheability metadata.
*
* @ingroup cache
*/
class CacheableMetadata implements RefinableCacheableDependencyInterface {
use RefinableCacheableDependencyTrait;
/**
* {@inheritdoc}
*/
public function getCacheTags() {
return $this->cacheTags;
}
/**
* Sets cache tags.
*
* @param string[] $cache_tags
* The cache tags to be associated.
*
* @return $this
*/
public function setCacheTags(array $cache_tags) {
$this->cacheTags = $cache_tags;
return $this;
}
/**
* {@inheritdoc}
*/
public function getCacheContexts() {
return $this->cacheContexts;
}
/**
* Sets cache contexts.
*
* @param string[] $cache_contexts
* The cache contexts to be associated.
*
* @return $this
*/
public function setCacheContexts(array $cache_contexts) {
$this->cacheContexts = $cache_contexts;
return $this;
}
/**
* {@inheritdoc}
*/
public function getCacheMaxAge() {
return $this->cacheMaxAge;
}
/**
* Sets the maximum age (in seconds).
*
* Defaults to Cache::PERMANENT
*
* @param int $max_age
* The max age to associate.
*
* @return $this
*
* @throws \InvalidArgumentException
* If a non-integer value is supplied.
*/
public function setCacheMaxAge($max_age) {
if (!is_int($max_age)) {
throw new \InvalidArgumentException('$max_age must be an integer');
}
$this->cacheMaxAge = $max_age;
return $this;
}
/**
* Merges the values of another CacheableMetadata object with this one.
*
* @param \Drupal\Core\Cache\CacheableMetadata $other
* The other CacheableMetadata object.
*
* @return static
* A new CacheableMetadata object, with the merged data.
*/
public function merge(CacheableMetadata $other) {
$result = clone $this;
// This is called many times per request, so avoid merging unless absolutely
// necessary.
if (empty($this->cacheContexts)) {
$result->cacheContexts = $other->cacheContexts;
}
elseif (empty($other->cacheContexts)) {
$result->cacheContexts = $this->cacheContexts;
}
else {
$result->cacheContexts = Cache::mergeContexts($this->cacheContexts, $other->cacheContexts);
}
if (empty($this->cacheTags)) {
$result->cacheTags = $other->cacheTags;
}
elseif (empty($other->cacheTags)) {
$result->cacheTags = $this->cacheTags;
}
else {
$result->cacheTags = Cache::mergeTags($this->cacheTags, $other->cacheTags);
}
if ($this->cacheMaxAge === Cache::PERMANENT) {
$result->cacheMaxAge = $other->cacheMaxAge;
}
elseif ($other->cacheMaxAge === Cache::PERMANENT) {
$result->cacheMaxAge = $this->cacheMaxAge;
}
else {
$result->cacheMaxAge = Cache::mergeMaxAges($this->cacheMaxAge, $other->cacheMaxAge);
}
return $result;
}
/**
* Applies the values of this CacheableMetadata object to a render array.
*
* @param array &$build
* A render array.
*/
public function applyTo(array &$build) {
$build['#cache']['contexts'] = $this->cacheContexts;
$build['#cache']['tags'] = $this->cacheTags;
$build['#cache']['max-age'] = $this->cacheMaxAge;
}
/**
* Creates a CacheableMetadata object with values taken from a render array.
*
* @param array $build
* A render array.
*
* @return static
*/
public static function createFromRenderArray(array $build) {
$meta = new static();
$meta->cacheContexts = (isset($build['#cache']['contexts'])) ? $build['#cache']['contexts'] : [];
$meta->cacheTags = (isset($build['#cache']['tags'])) ? $build['#cache']['tags'] : [];
$meta->cacheMaxAge = (isset($build['#cache']['max-age'])) ? $build['#cache']['max-age'] : Cache::PERMANENT;
return $meta;
}
/**
* 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;
}
}
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