private function shouldApplyDefaultValue($requiredOnly, $schema, $name = null, $parentSchema = null)
    {
        // required-only mode is off
        if (!$requiredOnly) {
            return true;
        }
        // draft-04 required is set
        if (
            $name !== null
            && isset($parentSchema->required)
            && is_array($parentSchema->required)
            && in_array($name, $parentSchema->required)
        ) {
            return true;
        }
        // draft-03 required is set
        if (isset($schema->required) && !is_array($schema->required) && $schema->required) {
            return true;
        }
        // default case
        return false;
    }