FileCache.php

<?php

/*
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * This software consists of voluntary contributions made by many individuals
 * and is licensed under the MIT license. For more information, see
 * <http://www.doctrine-project.org>.
 */
namespace Doctrine\Common\Cache;


/**
 * Base file cache driver.
 *
 * @since   2.3
 * @author  Fabio B. Silva <fabio.bat.silva@gmail.com>
 */
abstract class FileCache extends CacheProvider {

  /**
   * @var string Cache directory.
   */
  protected $directory;

  /**
   * @var string Cache file extension.
   */
  protected $extension;

  /**
   * Constructor
   *
   * @param string $directory Cache directory.
   * @param string $directory Cache file extension.
   *
   * @throws \InvalidArgumentException
   */
  public function __construct($directory, $extension = null) {
    if (!is_dir($directory) && !@mkdir($directory, 0777, true)) {
      throw new \InvalidArgumentException(sprintf('The directory "%s" does not exist and could not be created.', $directory));
    }
    if (!is_writable($directory)) {
      throw new \InvalidArgumentException(sprintf('The directory "%s" is not writable.', $directory));
    }
    $this->directory = realpath($directory);
    $this->extension = $extension ?: $this->extension;
  }

  /**
   * Gets the cache directory.
   *
   * @return string
   */
  public function getDirectory() {
    return $this->directory;
  }

  /**
   * Gets the cache file extension.
   *
   * @return string
   */
  public function getExtension() {
    return $this->extension;
  }

  /**
   * @return string
   */
  protected function getFilename($id) {
    $path = implode(str_split(md5($id), 12), DIRECTORY_SEPARATOR);
    $path = $this->directory . DIRECTORY_SEPARATOR . $path;
    return $path . DIRECTORY_SEPARATOR . $id . $this->extension;
  }

  /**
   * {@inheritdoc}
   */
  protected function doDelete($id) {
    return @unlink($this
      ->getFilename($id));
  }

  /**
   * {@inheritdoc}
   */
  protected function doFlush() {
    $pattern = '/^.+\\' . $this->extension . '$/i';
    $iterator = new \RecursiveDirectoryIterator($this->directory);
    $iterator = new \RecursiveIteratorIterator($iterator);
    $iterator = new \RegexIterator($iterator, $pattern);
    foreach ($iterator as $name => $file) {
      @unlink($name);
    }
    return true;
  }

  /**
   * {@inheritdoc}
   */
  protected function doGetStats() {
    return null;
  }

}