Method preStoreProcess

/**
 * Function that preProcesses data from a table prior to a store() to ensure proper tag handling
 *
 * @param   TableInterface  $table    Table being processed
 * @param   array           $newTags  Array of new tags
 *
 * @return  null
 *
 * @since   3.1
 */
public function preStoreProcess(TableInterface $table, $newTags = array())
{
    if ($newTags != array()) {
        $this->newTags = $newTags;
    }
    // If existing row, check to see if tags have changed.
    $oldTable = clone $table;
    $oldTable->reset();
    $key = $oldTable->getKeyName();
    $typeAlias = $this->typeAlias;
    if ($oldTable->{$key} && $oldTable->load()) {
        $this->oldTags = $this->getTagIds($oldTable->{$key}, $typeAlias);
    }
    // New items with no tags bypass this step.
    if (!empty($newTags) && \is_string($newTags) || isset($newTags[0]) && $newTags[0] != '' || isset($this->oldTags)) {
        if (\is_array($newTags)) {
            $newTags = implode(',', $newTags);
        }
        // We need to process tags if the tags have changed or if we have a new row
        $this->tagsChanged = empty($this->oldTags) && !empty($newTags) || !empty($this->oldTags) && $this->oldTags != $newTags || !$table->{$key};
    }
}