class FilesystemCache

1. 8.x drupal/core/vendor/kriswallsmith/assetic/src/Assetic/Cache/FilesystemCache.php \Assetic\Cache\FilesystemCache
2. 8.x drupal/core/vendor/doctrine/common/lib/Doctrine/Common/Cache/FilesystemCache.php \Doctrine\Common\Cache\FilesystemCache

class FilesystemCache implements CacheInterface {
  private $dir;
  public function __construct($dir) {
    $this->dir = $dir;
  }
  public function has($key) {
    return file_exists($this->dir . '/' . $key);
  }
  public function get($key) {
    $path = $this->dir . '/' . $key;
    if (!file_exists($path)) {
      throw new \RuntimeException('There is no cached value for ' . $key);
    }
    return file_get_contents($path);
  }
  public function set($key, $value) {
    if (!is_dir($this->dir) && false === @mkdir($this->dir, 0777, true)) {
      throw new \RuntimeException('Unable to create directory ' . $this->dir);
    }
    $path = $this->dir . '/' . $key;
    if (false === @file_put_contents($path, $value)) {
      throw new \RuntimeException('Unable to write file ' . $path);
    }
  }
  public function remove($key) {
    $path = $this->dir . '/' . $key;
    if (file_exists($path) && false === @unlink($path)) {
      throw new \RuntimeException('Unable to remove file ' . $path);
    }
  }

}