public LinkNeighborhood[] getBacklinksLN(URL url) throws IOException {
        String urlId = url2id.get(url.toString());
        if (urlId == null) {
            return null;
        }
        String strLinks = authGraph.get(urlId);
        if (strLinks == null) {
            return null;
        } else {
            List<LinkNeighborhood> tempLNs = new ArrayList<>();
            String[] linkIds = strLinks.split("###");
            for (String linkId : linkIds) {
                String lnStr = authID.get(linkId);
                LinkNeighborhood ln = parseString(lnStr);
                if (ln != null) {
                    tempLNs.add(ln);
                }
            }
            LinkNeighborhood[] lns = new LinkNeighborhood[tempLNs.size()];
            tempLNs.toArray(lns);
            return lns;
        }
    }
This method retrieves the backlinks of a given url.
ache/src/main/java/achecrawler/link/BipartiteGraphRepository.java