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| <?php | |
| /** | |
| * @file | |
| * Contains \Drupal\file\FileUsage\DatabaseFileUsageBackend. | |
| */ | |
| namespace Drupal\file\FileUsage; | |
| use Drupal\Core\Database\Connection; | |
| use Drupal\file\FileInterface; | |
| /** | |
| * Defines the database file usage backend. This is the default Drupal backend. | |
| */ | |
| class DatabaseFileUsageBackend extends FileUsageBase { | |
| /** | |
| * The database connection used to store file usage information. | |
| * | |
| * @var \Drupal\Core\Database\Connection | |
| */ | |
| protected $connection; | |
| /** | |
| * The name of the SQL table used to store file usage information. | |
| * | |
| * @var string | |
| */ | |
| protected $tableName; | |
| /** | |
| * Construct the DatabaseFileUsageBackend. | |
| * | |
| * @param \Drupal\Core\Database\Connection $connection | |
| * The database connection which will be used to store the file usage | |
| * information. | |
| * @param string $table | |
| * (optional) The table to store file usage info. Defaults to 'file_usage'. | |
| */ | |
| public function __construct(Connection $connection, $table = 'file_usage') { | |
| $this->connection = $connection; | |
| $this->tableName = $table; | |
| } | |
| /** | |
| * {@inheritdoc} | |
| */ | |
| public function add(FileInterface $file, $module, $type, $id, $count = 1) { | |
| $this->connection->merge($this->tableName) | |
| ->keys(array( | |
| 'fid' => $file->id(), | |
| 'module' => $module, | |
| 'type' => $type, | |
| 'id' => $id, | |
| )) | |
| ->fields(array('count' => $count)) | |
| ->expression('count', 'count + :count', array(':count' => $count)) | |
| ->execute(); | |
| parent::add($file, $module, $type, $id, $count); | |
| } | |
| /** | |
| * {@inheritdoc} | |
| */ | |
| public function delete(FileInterface $file, $module, $type = NULL, $id = NULL, $count = 1) { | |
| // Delete rows that have a exact or less value to prevent empty rows. | |
| $query = $this->connection->delete($this->tableName) | |
| ->condition('module', $module) | |
| ->condition('fid', $file->id()); | |
| if ($type && $id) { | |
| $query | |
| ->condition('type', $type) | |
| ->condition('id', $id); | |
| } | |
| if ($count) { | |
| $query->condition('count', $count, '<='); | |
| } | |
| $result = $query->execute(); | |
| // If the row has more than the specified count decrement it by that number. | |
| if (!$result && $count > 0) { | |
| $query = $this->connection->update($this->tableName) | |
| ->condition('module', $module) | |
| ->condition('fid', $file->id()); | |
| if ($type && $id) { | |
| $query | |
| ->condition('type', $type) | |
| ->condition('id', $id); | |
| } | |
| $query->expression('count', 'count - :count', array(':count' => $count)); | |
| $query->execute(); | |
| } | |
| parent::delete($file, $module, $type, $id, $count); | |
| } | |
| /** | |
| * {@inheritdoc} | |
| */ | |
| public function listUsage(FileInterface $file) { | |
| $result = $this->connection->select($this->tableName, 'f') | |
| ->fields('f', array('module', 'type', 'id', 'count')) | |
| ->condition('fid', $file->id()) | |
| ->condition('count', 0, '>') | |
| ->execute(); | |
| $references = array(); | |
| foreach ($result as $usage) { | |
| $references[$usage->module][$usage->type][$usage->id] = $usage->count; | |
| } | |
| return $references; | |
| } | |
| } |