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<?php |
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declare(strict_types=1); |
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namespace Overblog\GraphQLBundle\Relay\Connection; |
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use GraphQL\Executor\Promise\Promise; |
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use Overblog\GraphQLBundle\Definition\ArgumentInterface; |
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use Overblog\GraphQLBundle\Relay\Connection\Output\Connection; |
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use function call_user_func; |
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use function call_user_func_array; |
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use function count; |
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use function is_callable; |
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use function is_numeric; |
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use function max; |
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class Paginator |
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{ |
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public const MODE_REGULAR = false; |
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public const MODE_PROMISE = true; |
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private bool $promise; |
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private int $totalCount; |
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private ConnectionBuilder $connectionBuilder; |
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/** @var callable */ |
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private $fetcher; |
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public function __construct(callable $fetcher, bool $promise = self::MODE_REGULAR, ConnectionBuilder $connectionBuilder = null) |
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{ |
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$this->fetcher = $fetcher; |
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$this->promise = $promise; |
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$this->connectionBuilder = $connectionBuilder ?? new ConnectionBuilder(); |
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} |
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/** |
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* @param int|callable $total |
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* |
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* @return Connection|Promise A connection or a promise |
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*/ |
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public function backward(ArgumentInterface $args, $total, array $callableArgs = []) |
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{ |
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$total = $this->computeTotalCount($total, $callableArgs); |
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$limit = $args['last'] ?? null; |
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$before = $args['before'] ?? null; |
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$offset = max(0, $this->connectionBuilder->getOffsetWithDefault($before, $total) - $limit); |
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$entities = call_user_func($this->fetcher, $offset, $limit); |
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return $this->handleEntities($entities, function ($entities) use ($args, $offset, $total) { |
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return $this->connectionBuilder->connectionFromArraySlice($entities, $args, [ |
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'sliceStart' => $offset, |
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'arrayLength' => $total, |
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]); |
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}); |
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} |
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/** |
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* @return Connection|Promise A connection or a promise |
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*/ |
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public function forward(ArgumentInterface $args) |
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{ |
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$limit = $args['first'] ?? null; |
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$after = $args['after'] ?? null; |
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$offset = $this->connectionBuilder->getOffsetWithDefault($after, 0); |
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// If we don't have a cursor or if it's not valid, then we must not use the slice method |
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if (!is_numeric($this->connectionBuilder->cursorToOffset($after)) || !$after) { |
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$entities = call_user_func($this->fetcher, $offset, $limit ? $limit + 1 : $limit); |
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return $this->handleEntities($entities, function ($entities) use ($args) { |
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return $this->connectionBuilder->connectionFromArray($entities, $args); |
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}); |
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} else { |
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$entities = call_user_func($this->fetcher, $offset, $limit ? $limit + 2 : $limit); |
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return $this->handleEntities($entities, function ($entities) use ($args, $offset) { |
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return $this->connectionBuilder->connectionFromArraySlice($entities, $args, [ |
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'sliceStart' => $offset, |
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'arrayLength' => $offset + count($entities), |
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]); |
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}); |
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} |
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} |
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/** |
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* @param int|callable $total |
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* |
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* @return Connection|Promise A connection or a promise |
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*/ |
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public function auto(ArgumentInterface $args, $total, array $callableArgs = []) |
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{ |
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if (isset($args['last'])) { |
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$connection = $this->backward($args, $total, $callableArgs); |
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} else { |
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$connection = $this->forward($args); |
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} |
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if ($this->promise) { |
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/** @var Promise $connection */ |
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return $connection->then(function (ConnectionInterface $connection) use ($total, $callableArgs) { |
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$connection->setTotalCount($this->computeTotalCount($total, $callableArgs)); |
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return $connection; |
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}); |
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} else { |
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/** @var Connection $connection */ |
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$connection->setTotalCount($this->computeTotalCount($total, $callableArgs)); |
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return $connection; |
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} |
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} |
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/** |
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* @param array<int, string>|Promise $entities An array of entities to paginate or a promise |
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* |
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* @return Connection|Promise A connection or a promise |
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*/ |
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private function handleEntities($entities, callable $callback) |
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{ |
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if ($this->promise) { |
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/** @var Promise $entities */ |
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return $entities->then($callback); |
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} |
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return $callback($entities); |
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} |
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/** |
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* @param int|callable $total |
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* |
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* @return int|mixed |
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*/ |
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private function computeTotalCount($total, array $callableArgs = []) |
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{ |
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if (isset($this->totalCount)) { |
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return $this->totalCount; |
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} |
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$this->totalCount = is_callable($total) ? call_user_func_array($total, $callableArgs) : $total; |
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return $this->totalCount; |
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} |
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} |
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overblog /
GraphQLBundle
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