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<?php
namespace Illuminate\Http\Resources;
use Illuminate\Http\Resources\Json\JsonResource;
use Illuminate\Pagination\AbstractCursorPaginator;
use Illuminate\Pagination\AbstractPaginator;
use Illuminate\Support\Collection;
use Illuminate\Support\Str;
use LogicException;
use ReflectionClass;
use Traversable;
trait CollectsResources
{
/**
* Map the given collection resource into its individual resources.
*
* @param mixed $resource
* @return mixed
*/
protected function collectResource($resource)
{
if ($resource instanceof MissingValue) {
return $resource;
}
if (is_array($resource)) {
$resource = new Collection($resource);
}
$collects = $this->collects();
$this->collection = $collects && ! $resource->first() instanceof $collects
? $resource->mapInto($collects)
: $resource->toBase();
return ($resource instanceof AbstractPaginator || $resource instanceof AbstractCursorPaginator)
? $resource->setCollection($this->collection)
: $this->collection;
}
/**
* Get the resource that this resource collects.
*
* @return string|null
*/
protected function collects()
{
$collects = null;
if ($this->collects) {
$collects = $this->collects;
} elseif (str_ends_with(class_basename($this), 'Collection') &&
(class_exists($class = Str::replaceLast('Collection', '', get_class($this))) ||
class_exists($class = Str::replaceLast('Collection', 'Resource', get_class($this))))) {
$collects = $class;
}
if (! $collects || is_a($collects, JsonResource::class, true)) {
return $collects;
}
throw new LogicException('Resource collections must collect instances of '.JsonResource::class.'.');
}
/**
* Get the JSON serialization options that should be applied to the resource response.
*
* @return int
*/
public function jsonOptions()
{
$collects = $this->collects();
if (! $collects) {
return 0;
}
return (new ReflectionClass($collects))
->newInstanceWithoutConstructor()
->jsonOptions();
}
/**
* Get an iterator for the resource collection.
*
* @return \ArrayIterator
*/
public function getIterator(): Traversable
{
return $this->collection->getIterator();
}
}
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