WPType.php

<?php

namespace Mohiohio\GraphQLWP;

use GraphQL\Type\Definition\Type;
use GraphQLRelay\Relay;

class WPType
{

  private static $types;

  static function get($className)
  {
    return self::$types[$className] ?? (self::$types[$className] = self::initType($className));
  }

  static function getEdge($className, $nodeType)
  {
    return self::$types[$className . 'Edge'] ??
      (self::$types[$className . 'Edge'] = Relay::edgeType(['nodeType' => Type::nonNull($nodeType), 'name' => $nodeType->name]));
  }

  static function getConnection($className, $nodeType)
  {
    $key = $className . 'Connection';
    return self::$types[$key] ??
      (self::$types[$key] = Relay::connectionType([
        'nodeType' => $nodeType,
        'edgeType' => Type::nonNull(static::getEdge($className, $nodeType))
      ]));
  }

  protected static function initType($className)
  {
    if (!class_exists($className)) {
      return null;
    }

    return new $className();
  }
}