public void copyMap(@Nullable String mapName) {
    if (mapName == null) return;
    final MigrationMap copiedMap = myMigrationMapSet.findMigrationMap(mapName);
    if (copiedMap == null) return;

    myUi.getNameField().setText(copiedMap.getName());
    myUi.getDescriptionTextArea().setText(copiedMap.getDescription());
    while (myTable.getRowCount() > 0) removeRow(0);
    for (int i = 0; i < copiedMap.getEntryCount(); i++) {
      addEntry(copiedMap.getEntryAt(i));
    }
  }
public void copyMap(@Nullable String mapName)