Overblog\GraphQLBundle\Resolver\TypeResolver

Complexity

Total Complexity

19

Size/Duplication

Total Lines	117
Duplicated Lines	0 %

Coupling/Cohesion

Components	2
Dependencies	4

Test Coverage

Coverage

100%

Importance

Changes

0

9 Methods

Rating	Name	Duplication	Size	Complexity
A	setDispatcher()	0	4	1
A	onLoadSolution()	0	6	2
A	resolve()	0	13	3
A	string2Type()	0	8	2
A	baseType()	0	16	3
A	wrapTypeIfNeeded()	0	13	3
A	hasNeedListOfWrapper()	0	15	3
A	createTypeLoadingException()	0	11	1
A	supportedSolutionClass()	0	4	1

<?php

declare(strict_types=1);

namespace Overblog\GraphQLBundle\Resolver;

use GraphQL\Type\Definition\Type;
use Overblog\GraphQLBundle\Event\Events;
use Overblog\GraphQLBundle\Event\TypeLoadedEvent;
use Symfony\Component\EventDispatcher\EventDispatcherInterface;

class TypeResolver extends AbstractResolver
{
    private $cache = [];

    /** @var EventDispatcherInterface */
    private $dispatcher;

    public function setDispatcher(EventDispatcherInterface $dispatcher): void
    {
        $this->dispatcher = $dispatcher;
    }

    protected function onLoadSolution($solution): void
    {
        if (null !== $this->dispatcher) {
            $this->dispatcher->dispatch(Events::TYPE_LOADED, new TypeLoadedEvent($solution));
        }
    }

    /**
     * @param string $alias
     *
     * @return Type
     */
    public function resolve($alias): ?Type
    {
        if (null === $alias) {
            return null;
        }

        if (!isset($this->cache[$alias])) {
            $type = $this->string2Type($alias);
            $this->cache[$alias] = $type;
        }

        return $this->cache[$alias];
    }

    private function string2Type($alias)
    {
        if (false !== ($type = $this->wrapTypeIfNeeded($alias))) {
            return $type;
        }

        return $this->baseType($alias);
    }

    private function baseType($alias)
    {
        try {
            $type = $this->getSolution($alias);
        } catch (\Throwable $error) {
            throw self::createTypeLoadingException($alias, $error);
        }

        if (null !== $type) {
            return $type;
        }

        throw new UnresolvableException(
            \sprintf('Unknown type with alias "%s" (verified service tag)', $alias)
        );
    }

    private function wrapTypeIfNeeded($alias)
    {
        // Non-Null
        if ('!' === $alias[\strlen($alias) - 1]) {
            return Type::nonNull($this->string2Type(\substr($alias, 0, -1)));
        }
        // List
        if ($this->hasNeedListOfWrapper($alias)) {
            return Type::listOf($this->string2Type(\substr($alias, 1, -1)));
        }

        return false;
    }

    private function hasNeedListOfWrapper($alias)
    {
        if ('[' === $alias[0]) {
            $got = $alias[\strlen($alias) - 1];
            if (']' !== $got) {
                throw new UnresolvableException(
                    \sprintf('Malformed ListOf wrapper type "%s" expected "]" but got "%s".', $alias, \json_encode($got))
                );
            }

            return true;
        }

        return false;
    }

    /**
     * @param string     $alias
     * @param \Throwable $errorOrException
     *
     * @return \RuntimeException
     */
    private static function createTypeLoadingException(string $alias, \Throwable $errorOrException): \RuntimeException
    {
        return new \RuntimeException(
            \sprintf(
                'Type class for alias %s could not be load. If you are using your own classLoader verify the path and the namespace please.',
                \json_encode($alias)
            ),
            0,
            $errorOrException
        );
    }

    protected function supportedSolutionClass(): ?string
    {
        return Type::class;
    }
}