code: public List<String> getDirectoryEntries(VirtualFile mountPoint, VirtualFile target) {
          final VirtualFile assemblyFile = assembly.getFile(mountPoint, target);
          if (assemblyFile == null) {
              return new ArrayList<String>(assembly.getChildNames(mountPoint, target));
          }
          final List<String> directoryEntries = new LinkedList<String>();
          for (VirtualFile child : assemblyFile.getChildren()) {
              directoryEntries.add(child.getName());
          }
          return directoryEntries;
      }
docs: {@inheritDoc}