@NotNull
@Override
public Collection<String> getNonTrivialPackagePrefixes() {
Set<String> names = myNontrivialPackagePrefixes;
if (names == null) {
names = new HashSet<>();
final ProjectRootManager rootManager = ProjectRootManager.getInstance(myManager.getProject());
final List<VirtualFile> sourceRoots =
rootManager.getModuleSourceRoots(JavaModuleSourceRootTypes.SOURCES);
final ProjectFileIndex fileIndex = rootManager.getFileIndex();
for (final VirtualFile sourceRoot : sourceRoots) {
if (sourceRoot.isDirectory()) {
final String packageName = fileIndex.getPackageNameByDirectory(sourceRoot);
if (packageName != null && !packageName.isEmpty()) {
names.add(packageName);
}
}
}
myNontrivialPackagePrefixes = names;
}
return names;
}
