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<?php namespace WonderPush\Obj; if (count(get_included_files()) === 1) { http_response_code(403); exit(); } // Prevent direct access /** * Null marker for {@link \WonderPush\Obj\BaseObject} fields. * * The singleton instance of this class marks JSON `null` fields, as opposed to fields that are not set - which are represented by PHP's `null` value. * * For instance when deserializing the following JSON object `{"foo": "bar", "baz": null}` into a {@link \WonderPush\Obj\BaseObject}, * calling `getBar()` would return `NullObject::getInstance()`, because the field is set to the JSON null value, * but calling `getQux()` would return `null`, because the field is not set. */ class NullObject extends BaseObject { private static $_instance; /** * DO NOT CALL. * @throws \LogicException * @see \WonderPush\Obj\NullObject::getInstance() */ public function __construct() { if (self::$_instance !== null) { throw new \LogicException('You should not instantiate \WonderPush\Obj\NullObject, use \WonderPush\Obj\NullObject::getInstance() instead.'); } parent::__construct(); } public static function getInstance() { if (self::$_instance === null) { self::$_instance = new self(); } return self::$_instance; } protected function buildDataFromFields() { return null; } } NullObject::getInstance(); // ensure creation and that calling the constructor throws
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