public CanUpload canUpload() {
final CanUpload canUpload;
if (treeComponent.getMultiSelection().isEmpty()) {
canUpload = CanUpload.cannotUpload("No files selected");
} else {
canUpload = CanUpload.canUpload();
}
return canUpload;
}
public int getNumSelectedFiles() {
return treeComponent.getMultiSelection().size();
}
private Collection<TreeItem> getTreeItems() {
return treeComponent.getMultiSelection();
}