if (sourceFile != null) {
treeMapper.openSourceDataFile(sourceFile);
atLeastOneFileOpened = true;
}
if (linkFile != null && targetFile != null) {
treeMapper.openTargetDataFile(targetFile, linkFile);
atLeastOneFileOpened = true;
} else {
closeTargetAndLinkFiles();
}
if (atLeastOneFileOpened && askForAttentionWhenDone) {