class MapFieldIter

class MapFieldIter implements \Iterator {
    
    /**
     * @ignore
     */
    private $container;
    
    /**
     * @ignore
     */
    private $key_type;
    
    /**
     * Create iterator instance for MapField.
     *
     * @param array $container
     * @param GPBType $key_type Map key type.
     * @ignore
     */
    public function __construct($container, $key_type) {
        $this->container = $container;
        $this->key_type = $key_type;
    }
    
    /**
     * Reset the status of the iterator
     *
     * @return void
     * @todo need to add return type void (require update php version to 7.1)
     */
    public function rewind() {
        reset($this->container);
    }
    
    /**
     * Return the element at the current position.
     *
     * @return object The element at the current position.
     * @todo need to add return type mixed (require update php version to 8.0)
     */
    public function current() {
        return current($this->container);
    }
    
    /**
     * Return the current key.
     *
     * @return object The current key.
     * @todo need to add return type mixed (require update php version to 8.0)
     */
    public function key() {
        $key = key($this->container);
        switch ($this->key_type) {
            case GPBType::INT64:
            case GPBType::UINT64:
            case GPBType::FIXED64:
            case GPBType::SFIXED64:
            case GPBType::SINT64:
                if (PHP_INT_SIZE === 8) {
                    return $key;
                }
            // Intentionally fall through
            case GPBType::STRING:
                // PHP associative array stores int string as int for key.
                return strval($key);
            case GPBType::BOOL:
                // PHP associative array stores bool as integer for key.
                return boolval($key);
            default:
                return $key;
        }
    }
    
    /**
     * Move to the next position.
     *
     * @return void
     * @todo need to add return type void (require update php version to 7.1)
     */
    public function next() {
        next($this->container);
    }
    
    /**
     * Check whether there are more elements to iterate.
     *
     * @return bool True if there are more elements to iterate.
     */
    public function valid() : bool {
        return key($this->container) !== null;
    }

}