Symfony HttpFoundation Zend\Authentication\Storage adapter

SymfonySession.php

<?php
namespace Spekkionu\Zend\Authentication\Storage;

use Zend\Authentication\Storage\StorageInterface;
use Symfony\Component\HttpFoundation\Session\Session;

class SymfonySession implements StorageInterface
{
    /**
     * Default session namespace
     */
    const NAMESPACE_DEFAULT = 'Zend_Auth';

    /**
     * Session namespace
     *
     * @var mixed
     */
    protected $namespace = self::NAMESPACE_DEFAULT;

    /**
     * @var Session $session
     */
    protected $session;

    /**
     * Sets session storage options and initializes session namespace object
     *
     * @param  SessionManager $manager
     * @param  mixed $namespace
     */
    public function __construct(Session $session, $namespace = null)
    {
        if ($namespace !== null) {
            $this->namespace = $namespace;
        }
        $this->session = $session;
    }

    /**
     * Returns the session namespace
     *
     * @return string
     */
    public function getNamespace()
    {
        return $this->namespace;
    }

    /**
     * Returns true if and only if storage is empty
     *
     * @throws \Zend\Authentication\Exception\ExceptionInterface If it is impossible to determine whether storage is empty
     * @return bool
     */
    public function isEmpty()
    {
        return $this->session->has($this->namespace);
    }

    /**
     * Returns the contents of storage
     *
     * Behavior is undefined when storage is empty.
     *
     * @throws \Zend\Authentication\Exception\ExceptionInterface If reading contents from storage is impossible
     * @return mixed
     */
    public function read()
    {
        return $this->session->get($this->namespace);
    }

    /**
     * Writes $contents to storage
     *
     * @param  mixed $contents
     * @throws \Zend\Authentication\Exception\ExceptionInterface If writing $contents to storage is impossible
     * @return void
     */
    public function write($contents){
        $session->set($this->namespace, $contents);
    }

    /**
     * Clears contents from storage
     *
     * @throws \Zend\Authentication\Exception\ExceptionInterface If clearing contents from storage is impossible
     * @return void
     */
    public function clear()
    {
        $this->session->remove($this->namespace);
    }
}