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<?php
/**
*
* This file is part of Aura for PHP.
*
* @license http://opensource.org/licenses/bsd-license.php BSD
*
*/
namespace Aura\Session;
/**
*
* A session segment; lazy-loads from the session.
*
* @package Aura.Session
*
*/
class Segment implements SegmentInterface
{
/**
*
* The session manager.
*
* @var Session
*
*/
protected $session;
/**
*
* The segment name.
*
* @var string
*
*/
protected $name;
/**
*
* Constructor.
*
* @param Session $session The session manager.
*
* @param string $name The segment name.
*
*/
public function __construct(Session $session, $name)
{
$this->session = $session;
$this->name = $name;
}
/**
*
* Returns the value of a key in the segment.
*
* @param string $key The key in the segment.
*
* @param mixed $alt An alternative value to return if the key is not set.
*
* @return mixed
*
*/
public function get($key, $alt = null)
{
$this->resumeSession();
return isset($_SESSION[$this->name][$key])
? $_SESSION[$this->name][$key]
: $alt;
}
/**
*
* Sets the value of a key in the segment.
*
* @param string $key The key to set.
*
* @param mixed $val The value to set it to.
*
*/
public function set($key, $val)
{
$this->resumeOrStartSession();
$_SESSION[$this->name][$key] = $val;
}
/**
*
* Clear all data from the segment.
*
* @return null
*
*/
public function clear()
{
if ($this->resumeSession()) {
$_SESSION[$this->name] = array();
}
}
/**
*
* Sets a flash value for the *next* request.
*
* @param string $key The key for the flash value.
*
* @param mixed $val The flash value itself.
*
*/
public function setFlash($key, $val)
{
$this->resumeOrStartSession();
$_SESSION[Session::FLASH_NEXT][$this->name][$key] = $val;
}
/**
*
* Gets the flash value for a key in the *current* request.
*
* @param string $key The key for the flash value.
*
* @param mixed $alt An alternative value to return if the key is not set.
*
* @return mixed The flash value itself.
*
*/
public function getFlash($key, $alt = null)
{
$this->resumeSession();
return isset($_SESSION[Session::FLASH_NOW][$this->name][$key])
? $_SESSION[Session::FLASH_NOW][$this->name][$key]
: $alt;
}
/**
*
* Clears flash values for *only* the next request.
*
* @return null
*
*/
public function clearFlash()
{
if ($this->resumeSession()) {
$_SESSION[Session::FLASH_NEXT][$this->name] = array();
}
}
/**
*
* Gets the flash value for a key in the *next* request.
*
* @param string $key The key for the flash value.
*
* @param mixed $alt An alternative value to return if the key is not set.
*
* @return mixed The flash value itself.
*
*/
public function getFlashNext($key, $alt = null)
{
$this->resumeSession();
return isset($_SESSION[Session::FLASH_NEXT][$this->name][$key])
? $_SESSION[Session::FLASH_NEXT][$this->name][$key]
: $alt;
}
/**
*
* Sets a flash value for the *next* request *and* the current one.
*
* @param string $key The key for the flash value.
*
* @param mixed $val The flash value itself.
*
*/
public function setFlashNow($key, $val)
{
$this->resumeOrStartSession();
$_SESSION[Session::FLASH_NOW][$this->name][$key] = $val;
$_SESSION[Session::FLASH_NEXT][$this->name][$key] = $val;
}
/**
*
* Clears flash values for *both* the next request *and* the current one.
*
* @return null
*
*/
public function clearFlashNow()
{
if ($this->resumeSession()) {
$_SESSION[Session::FLASH_NOW][$this->name] = array();
$_SESSION[Session::FLASH_NEXT][$this->name] = array();
}
}
/**
*
* Retains all the current flash values for the next request; values that
* already exist for the next request take precedence.
*
* @return null
*
*/
public function keepFlash()
{
if ($this->resumeSession()) {
$_SESSION[Session::FLASH_NEXT][$this->name] = array_merge(
$_SESSION[Session::FLASH_NEXT][$this->name],
$_SESSION[Session::FLASH_NOW][$this->name]
);
}
}
/**
*
* Loads the segment only if the session has already been started, or if
* a session is available (in which case it resumes the session first).
*
* @return bool
*
*/
protected function resumeSession()
{
if ($this->session->isStarted() || $this->session->resume()) {
$this->load();
return true;
}
return false;
}
/**
*
* Sets the segment properties to $_SESSION references.
*
* @return null
*
*/
protected function load()
{
if (! isset($_SESSION[$this->name])) {
$_SESSION[$this->name] = array();
}
if (! isset($_SESSION[Session::FLASH_NOW][$this->name])) {
$_SESSION[Session::FLASH_NOW][$this->name] = array();
}
if (! isset($_SESSION[Session::FLASH_NEXT][$this->name])) {
$_SESSION[Session::FLASH_NEXT][$this->name] = array();
}
}
/**
*
* Resumes a previous session, or starts a new one, and loads the segment.
*
* @return null
*
*/
protected function resumeOrStartSession()
{
if (! $this->resumeSession()) {
$this->session->start();
$this->load();
}
}
}
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