class File_Iterator_Facade

class File_Iterator_Facade {

  /**
   * @param  array|string $paths
   * @param  array|string $suffixes
   * @param  array|string $prefixes
   * @param  array        $exclude
   * @param  boolean      $commonPath
   * @return array
   */
  public function getFilesAsArray($paths, $suffixes = '', $prefixes = '', array $exclude = array(), $commonPath = FALSE) {
    if (is_string($paths)) {
      $paths = array(
        $paths,
      );
    }
    $factory = new File_Iterator_Factory();
    $iterator = $factory
      ->getFileIterator($paths, $suffixes, $prefixes, $exclude);
    $files = array();
    foreach ($iterator as $file) {
      $file = $file
        ->getRealPath();
      if ($file) {
        $files[] = $file;
      }
    }
    foreach ($paths as $path) {
      if (is_file($path)) {
        $files[] = realpath($path);
      }
    }
    $files = array_unique($files);
    sort($files);
    if ($commonPath) {
      return array(
        'commonPath' => $this
          ->getCommonPath($files),
        'files' => $files,
      );
    }
    else {
      return $files;
    }
  }

  /**
   * Returns the common path of a set of files.
   *
   * @param  array $files
   * @return string
   */
  protected function getCommonPath(array $files) {
    $count = count($files);
    if ($count == 0) {
      return '';
    }
    if ($count == 1) {
      return dirname($files[0]) . DIRECTORY_SEPARATOR;
    }
    $_files = array();
    foreach ($files as $file) {
      $_files[] = $_fileParts = explode(DIRECTORY_SEPARATOR, $file);
      if (empty($_fileParts[0])) {
        $_fileParts[0] = DIRECTORY_SEPARATOR;
      }
    }
    $common = '';
    $done = FALSE;
    $j = 0;
    $count--;
    while (!$done) {
      for ($i = 0; $i < $count; $i++) {
        if ($_files[$i][$j] != $_files[$i + 1][$j]) {
          $done = TRUE;
          break;
        }
      }
      if (!$done) {
        $common .= $_files[0][$j];
        if ($j > 0) {
          $common .= DIRECTORY_SEPARATOR;
        }
      }
      $j++;
    }
    return DIRECTORY_SEPARATOR . $common;
  }

}