protected function ExifTagMapper::getStringToTagMap in File metadata manager 8.2

Same name and namespace in other branches

1. 8 file_mdm_exif/src/ExifTagMapper.php \Drupal\file_mdm_exif\ExifTagMapper::getStringToTagMap()

Returns the map of TAG strings to IFD/TAG integers.

Builds and caches the list as needed.

Return value

array An associative array where keys are TAG literals, and values a simple array of IFD/TAG integer identifiers.

File

file_mdm_exif/src/ExifTagMapper.php, line 243

Class

ExifTagMapper

Provides a mapping service for EXIF ifds and tags.

Namespace

Drupal\file_mdm_exif

Code

protected function getStringToTagMap() {
  if (!$this->stringToTagMap) {
    $cache_id = 'stringToTag';
    if ($cache = $this
      ->getCache($cache_id)) {
      $this->stringToTagMap = $cache->data;
    }
    else {
      foreach ($this
        ->getSupportedIfdsMap() as $ifd) {
        $ifd_obj = new PelIfd($ifd[1]);
        $valid_tags = $ifd_obj
          ->getValidTags();
        foreach ($valid_tags as $tag) {
          $tag_name = strtolower(PelTag::getName($ifd[1], $tag));
          if (!isset($this->stringToTagMap[$tag_name])) {
            $this->stringToTagMap[$tag_name] = [
              $ifd[1],
              $tag,
            ];
          }
        }
      }
      $this
        ->setCache($cache_id, $this->stringToTagMap);
    }
  }
  return $this->stringToTagMap;
}