feed_import_merge.inc in Feed Import 7.3

This file contains Feed Import field merge methods.

File

feed_import_base/inc/feed_import_merge.inc

<?php

/**
 * @file
 * This file contains Feed Import field merge methods.
 */

/**
 * Class which merges field values checking for duplicates.
 * Default merge mode.
 */
class FeedImportMergeNoDuplicates extends FeedImportMergeField {

  /**
   * {@inheritdoc}
   */
  public function merge(array &$current, array &$new, array &$field) {
    $changed = FALSE;
    $cnt = count($new);
    if ($cnt == count($current)) {

      // Same number of items, it is possible that the
      // field is still the same
      // Just check if the items are the same.
      for ($i = 0; $i < $cnt; $i++) {
        if (!$field['compare']($new[$i], $current[$i])) {
          $changed = TRUE;
          break;
        }
      }
    }
    else {

      // Different number of items, the field is 100% changed.
      $changed = TRUE;
    }
    if ($changed) {

      // Get the new field values, but try to copy the existing ones.
      $temp = array();
      for ($i = 0; $i < $cnt; $i++) {
        $not_found = TRUE;
        foreach ($current as $key => &$val) {

          // Compare by function.
          if ($field['compare']($new[$i], $val)) {

            // Value is the same, just get a reference.
            $temp[] =& $val;
            $not_found = FALSE;
            break;
          }
        }
        unset($val);
        if ($not_found) {

          // The value is new.
          $temp[] =& $new[$i];
        }
      }

      // Set current.
      $current = $temp;
    }
    return $changed;
  }

}

/**
 * Class which merges field values without checking for duplicates.
 */
class FeedImportMergeDuplicates extends FeedImportMergeField {

  /**
   * {@inheritdoc}
   */
  public function merge(array &$current, array &$new, array &$field) {
    if ($field['cardinality'] == -1) {
      $current = array_merge($current, $new);
      return TRUE;
    }
    elseif (($cnt = count($current)) < $field['cardinality']) {
      $cnt = $field['cardinality'] - $cnt;
      $current = array_merge($current, count($new) <= $cnt ? $new : array_slice($new, 0, $cnt));
      return TRUE;
    }
    return FALSE;
  }

}

/**
 * Class which overwrites values. A simple value by value comparison is made.
 * This also overwrites values if missing from source.
 */
class FeedImportMergeOverwrite extends FeedImportMergeField {

  /**
   * {@inheritdoc}
   */
  public function overwriteEmpty() {
    return TRUE;
  }

  /**
   * {@inheritdoc}
   */
  public function merge(array &$current, array &$new, array &$field) {
    $cnt = count($new);
    if ($cnt != count($current)) {

      // Different number of values.
      $current = $new;
      return TRUE;
    }

    // Same number of values. Might be the same.
    $changed = FALSE;
    for ($i = 0; $i < $cnt; $i++) {
      if (!$field['compare']($new[$i], $current[$i])) {
        $current[$i] = $new[$i];
        $changed = TRUE;
      }
    }
    return $changed;
  }

}

/**
 * This class just overwrites values without any checks.
 * Does not overwrites values if are missing from source.
 */
class FeedImportMergeOverwriteFast extends FeedImportMergeField {

  /**
   * {@inheritdoc}
   */
  public function merge(array &$current, array &$new, array &$field) {
    $current = $new;
    return TRUE;
  }

}

Classes

Name	Description
FeedImportMergeDuplicates	Class which merges field values without checking for duplicates.
FeedImportMergeNoDuplicates	Class which merges field values checking for duplicates. Default merge mode.
FeedImportMergeOverwrite	Class which overwrites values. A simple value by value comparison is made. This also overwrites values if missing from source.
FeedImportMergeOverwriteFast	This class just overwrites values without any checks. Does not overwrites values if are missing from source.