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<?php
namespace Guzzle\Plugin\Cookie\CookieJar;
use Guzzle\Common\Exception\RuntimeException;
class FileCookieJar extends ArrayCookieJar
{
    
    protected $filename;
    
    public function __construct($cookieFile)
    {
        $this->filename = $cookieFile;
        $this->load();
    }
    
    public function __destruct()
    {
        $this->persist();
    }
    
    protected function persist()
    {
        if (false === file_put_contents($this->filename, $this->serialize())) {
            
            throw new RuntimeException('Unable to open file ' . $this->filename);
            
        }
    }
    
    protected function load()
    {
        $json = file_get_contents($this->filename);
        if (false === $json) {
            
            throw new RuntimeException('Unable to open file ' . $this->filename);
            
        }
        $this->unserialize($json);
        $this->cookies = $this->cookies ?: array();
    }
}