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/**

 * Fix importer mappings for file and image fields to use :uri convention.

 */

  // If this is the first pass through this update function then set some

  // variables.

  if (!isset($sandbox['progress'])) {

    $importers = feeds_importer_load_all(TRUE);

    $sandbox['importers'] = array_keys($importers);

    $sandbox['progress'] = 0;

    $sandbox['updated_count'] = 0;

    $sandbox['max'] = count($sandbox['importers']);

  }

  if (empty($sandbox['importers'])) {

    return t('No importers to process.');

  }

  // Load a single importer.

  $importer = array_pop($sandbox['importers']);

  $importer = feeds_importer($importer);

  $mappings = $importer->processor->getMappings();

  foreach ($mappings as $key => $mapping) {

    // Act on mappings that do not contain a colon.

    if (strpos($mapping['target'], ':') !== FALSE) {

      continue;

    }

    // Get field data. Check if $info is empty to weed out non-field mappings

    // like temporary targets.

    if (!$info = field_info_field($mapping['target'])) {

      continue;

    }

    // Act on file or image fields.

    if (in_array($info['type'], array('file', 'image'))) {

      // Add ':uri' to fix the mapping.

      $mappings[$key]['target'] = $mapping['target'] . ':uri';

    }

  }

  // If importer has changed, add the updated config and save it.

  if ($importer->processor->getMappings() !== $mappings) {

    $importer->processor->addConfig(array('mappings' => $mappings));

    $importer->save();

    $sandbox['updated_count']++;

  }

  $sandbox['progress']++;

  // Set the value for finished. If progress == max then finished will be 1,

  // signifying we are done.

  $sandbox['#finished'] = ($sandbox['progress'] / $sandbox['max']);

  if (empty($sandbox['importers'])) {

    $sandbox['#finished'] = 1;

    return t('@importers total importers processed, @updated_count with fields that were updated.', array('@importers' => $sandbox['max'], '@updated_count' => $sandbox['updated_count']));

  }