class Condition in GraphQL 8.4

Conditional resolver.

From given set of conditions and their respective resolvers it resolves the one whose condition is evaluated with non empty value.

Hierarchy

• class \Drupal\graphql\GraphQL\Resolver\Condition implements ResolverInterface

1 file declares its use of Condition

ResolverBuilder.php in src/GraphQL/ResolverBuilder.php

File

src/GraphQL/Resolver/Condition.php, line 17

Namespace

Drupal\graphql\GraphQL\Resolver

class Condition implements ResolverInterface {

  /**
   * List of condition and their corresponding resolvers.
   *
   * @var array
   */
  protected $branches;

  /**
   * Condition constructor.
   *
   * @param array $branches
   */
  public function __construct(array $branches) {
    $this->branches = $branches;
  }

  /**
   * {@inheritdoc}
   */
  public function resolve($value, $args, ResolveContext $context, ResolveInfo $info, FieldContext $field) {
    $branches = $this->branches;
    while (list($condition, $resolver) = array_pad(array_shift($branches), 2, NULL)) {
      if ($condition instanceof ResolverInterface) {
        if (($condition = $condition
          ->resolve($value, $args, $context, $info, $field)) === NULL) {

          // Bail out early if a resolver returns NULL.
          continue;
        }
      }
      if ($condition instanceof SyncPromise) {
        return DeferredUtility::returnFinally($condition, function ($cond) use ($branches, $resolver, $value, $args, $context, $info, $field) {
          array_unshift($branches, [
            $cond,
            $resolver,
          ]);
          return (new Condition($branches))
            ->resolve($value, $args, $context, $info, $field);
        });
      }
      if ((bool) $condition) {

        /** @var \Drupal\graphql\GraphQL\Resolver\ResolverInterface|null $resolver */
        return $resolver ? $resolver
          ->resolve($value, $args, $context, $info, $field) : $condition;
      }
    }

    // Functional languages throw exceptions here. Should we just return NULL?
    return NULL;
  }

}

Members

Name	Modifiers	Type	Description	Overrides
Condition::$branches	protected	property	List of condition and their corresponding resolvers.
Condition::resolve	public	function	Resolve values for the fields. Overrides ResolverInterface::resolve
Condition::__construct	public	function	Condition constructor.