class NullIdMap

class NullIdMap extends PluginBase implements MigrateIdMapInterface {
    
    /**
     * {@inheritdoc}
     */
    public function setMessage(MigrateMessageInterface $message) {
        // Do nothing.
    }
    
    /**
     * {@inheritdoc}
     */
    public function getRowBySource(array $source_id_values) {
        return [];
    }
    
    /**
     * {@inheritdoc}
     */
    public function getRowByDestination(array $destination_id_values) {
        return [];
    }
    
    /**
     * {@inheritdoc}
     */
    public function getRowsNeedingUpdate($count) {
        return 0;
    }
    
    /**
     * {@inheritdoc}
     */
    public function lookupSourceId(array $destination_id_values) {
        return [];
    }
    
    /**
     * {@inheritdoc}
     */
    public function lookupDestinationIds(array $source_id_values) {
        return [];
    }
    
    /**
     * {@inheritdoc}
     */
    public function saveIdMapping(Row $row, array $destination_id_values, $source_row_status = MigrateIdMapInterface::STATUS_IMPORTED, $rollback_action = MigrateIdMapInterface::ROLLBACK_DELETE) {
        // Do nothing.
    }
    
    /**
     * {@inheritdoc}
     */
    public function saveMessage(array $source_id_values, $message, $level = MigrationInterface::MESSAGE_ERROR) {
        // Do nothing.
    }
    
    /**
     * {@inheritdoc}
     */
    public function getMessages(array $source_id_values = [], $level = NULL) {
        return new \ArrayIterator([]);
    }
    
    /**
     * {@inheritdoc}
     */
    public function prepareUpdate() {
        // Do nothing.
    }
    
    /**
     * {@inheritdoc}
     */
    public function processedCount() {
        return 0;
    }
    
    /**
     * {@inheritdoc}
     */
    public function importedCount() {
        return 0;
    }
    
    /**
     * {@inheritdoc}
     */
    public function updateCount() {
        return 0;
    }
    
    /**
     * {@inheritdoc}
     */
    public function errorCount() {
        return 0;
    }
    
    /**
     * {@inheritdoc}
     */
    public function messageCount() {
        return 0;
    }
    
    /**
     * {@inheritdoc}
     */
    public function delete(array $source_id_values, $messages_only = FALSE) {
        // Do nothing.
    }
    
    /**
     * {@inheritdoc}
     */
    public function deleteDestination(array $destination_id_values) {
        // Do nothing.
    }
    
    /**
     * {@inheritdoc}
     */
    public function setUpdate(array $source_id_values) {
        // Do nothing.
    }
    
    /**
     * {@inheritdoc}
     */
    public function clearMessages() {
        // Do nothing.
    }
    
    /**
     * {@inheritdoc}
     */
    public function destroy() {
        // Do nothing.
    }
    
    /**
     * {@inheritdoc}
     */
    public function currentDestination() {
        return NULL;
    }
    
    /**
     * {@inheritdoc}
     */
    public function currentSource() {
        return NULL;
    }
    
    /**
     * {@inheritdoc}
     */
    public function getQualifiedMapTableName() {
        return '';
    }
    
    /**
     * {@inheritdoc}
     */
    public function rewind() {
        return NULL;
    }
    
    /**
     * {@inheritdoc}
     */
    public function current() {
        return NULL;
    }
    
    /**
     * {@inheritdoc}
     */
    public function key() {
        return '';
    }
    
    /**
     * {@inheritdoc}
     */
    public function next() {
        return NULL;
    }
    
    /**
     * {@inheritdoc}
     */
    public function valid() {
        return FALSE;
    }

}