public static boolean isRoot(PsiFileSystemItem directory) {
if (directory == null) return true;
VirtualFile vFile = directory.getVirtualFile();
if (vFile == null) return true;
ProjectFileIndex fileIndex = ProjectFileIndex.SERVICE.getInstance(directory.getProject());
return Comparing.equal(fileIndex.getClassRootForFile(vFile), vFile)
|| Comparing.equal(fileIndex.getContentRootForFile(vFile), vFile)
|| Comparing.equal(fileIndex.getSourceRootForFile(vFile), vFile);
}
@Override
protected String getContainerText(PsiFileSystemItem element, String name) {
PsiFileSystemItem parent = element.getParent();
final PsiDirectory psiDirectory = parent instanceof PsiDirectory ? (PsiDirectory) parent : null;
if (psiDirectory == null) return null;
final VirtualFile virtualFile = psiDirectory.getVirtualFile();
final String relativePath = getRelativePath(virtualFile, element.getProject());
if (relativePath == null) return "( " + File.separator + " )";
String path =
FilePathSplittingPolicy.SPLIT_BY_SEPARATOR.getOptimalTextForComponent(
name + " ", new File(relativePath), this, myMaxWidth);
return "(" + path + ")";
}