Retcat_Dbpedia Class Reference

Static Public Member Functions
static Map< String, SuggestionItem >	query (String searchword) throws IOException, RepositoryException, MalformedQueryException, QueryEvaluationException, SesameSparqlException, ResourceNotAvailableException, ParseException, link.labeling.retcat.exceptions.ResourceNotAvailableException
static JSONObject	info (String url) throws IOException, RepositoryException, MalformedQueryException, QueryEvaluationException, SesameSparqlException, ResourceNotAvailableException, ParseException, RetcatException

Member Function Documentation

info()

static JSONObject info ( String  url ) throws IOException, RepositoryException, MalformedQueryException, QueryEvaluationException, SesameSparqlException, ResourceNotAvailableException, ParseException, RetcatException

static

                                                                                                                                                                                                                                    {
                try {
                        String outputUrl = url;
                        url = url.replace("resource", "data");
                        url = url + ".json";
                        URL obj = new URL(url);
                        HttpURLConnection con = (HttpURLConnection) obj.openConnection();
                        con.setRequestMethod("GET");
                        BufferedReader in = new BufferedReader(new InputStreamReader(con.getInputStream(), "UTF8"));
                        String inputLine;
                        StringBuilder response = new StringBuilder();
                        while ((inputLine = in.readLine()) != null) {
                                response.append(inputLine);
                        }
                        in.close();
                        // parse json
                        JSONObject jsonObject = (JSONObject) new JSONParser().parse(response.toString());
                        JSONObject thisValue = (JSONObject) jsonObject.get(outputUrl);
                        JSONArray nameArray = (JSONArray) thisValue.get("http://www.w3.org/2000/01/rdf-schema#label");
                        String name = "";
                        String lang = "";
                        for (Object element : nameArray) {
                                JSONObject tmpObj = (JSONObject) element;
                                String langTmp = (String) tmpObj.get("lang");
                                if (langTmp.equals("en")) {
                                        name = (String) tmpObj.get("value");
                                        lang = (String) tmpObj.get("lang");
                                }
                        }
                        if (name.equals("")) {
                                JSONObject tmpObj = (JSONObject) nameArray.get(0);
                                name = (String) tmpObj.get("value");
                                lang = (String) tmpObj.get("lang");
                        }
                        JSONArray abstractArray = (JSONArray) thisValue.get("http://dbpedia.org/ontology/abstract");
                        String desc = "";
                        if (abstractArray != null) {
                                for (Object element : abstractArray) {
                                        JSONObject tmpObj = (JSONObject) element;
                                        String langTmp = (String) tmpObj.get("lang");
                                        if (langTmp.equals("en")) {
                                                desc = (String) tmpObj.get("value");
                                        }
                                }
                                if (desc.equals("")) {
                                        JSONObject tmpObj = (JSONObject) abstractArray.get(0);
                                        desc = (String) tmpObj.get("value");
                                }
                        }
                        // output
                        JSONObject jsonOut = new JSONObject();
                        jsonOut.put("label", name);
                        jsonOut.put("lang", lang);
                        // get retcat info
                        String type = "dbpedia";
                        String quality = "";
                        String group = "";
                        for (RetcatItem item : LocalRetcatItems.getLocalCatalogue()) {
                                if (item.getType().equals(type)) {
                                        quality = item.getQuality();
                                        group = item.getGroup();
                                        type = item.getType();
                                }
                        }
                        jsonOut.put("type", type);
                        jsonOut.put("quality", quality);
                        jsonOut.put("group", group);
                        jsonOut.put("description", desc);
                        jsonOut.put("uri", outputUrl);
                        jsonOut.put("scheme", "DBpedia");
                        // broader and narrower
                        JSONArray broaderTerms = new JSONArray();
                        JSONArray narrowerTerms = new JSONArray();
                        jsonOut.put("broaderTerms", broaderTerms);
                        jsonOut.put("narrowerTerms", narrowerTerms);
                        if (jsonOut.get("label") != null && !jsonOut.get("label").equals("")) {
                                return jsonOut;
                        } else {
                                throw new RetcatException("no label for this uri available");
                        }
                } catch (Exception e) {
                        return new JSONObject();
                }
        }

References LocalRetcatItems.getLocalCatalogue().

Referenced by RetcatResource.getInfoDBpedia(), and RetcatResource.getQueryResultsDBPEDIA().

query()

static Map<String, SuggestionItem> query ( String  searchword ) throws IOException, RepositoryException, MalformedQueryException, QueryEvaluationException, SesameSparqlException, ResourceNotAvailableException, ParseException, link.labeling.retcat.exceptions.ResourceNotAvailableException

static

                                                                                                                                                                                                                                                                                                           {
                searchword = GeneralFunctions.encodeURIComponent(searchword);
                String url_string = "http://lookup.dbpedia.org/api/search.asmx/KeywordSearch?QueryString=" + searchword + "&MaxHits=" + RetcatResource.getLimit();
                URL url = new URL(url_string);
                HttpURLConnection conn = (HttpURLConnection) url.openConnection();
                conn.setRequestProperty("Accept", "application/json");
                BufferedReader br = new BufferedReader(new InputStreamReader(conn.getInputStream(), "UTF-8"));
                String inputLine;
                StringBuilder response = new StringBuilder();
                while ((inputLine = br.readLine()) != null) {
                        response.append(inputLine);
                }
                br.close();
                // fill objects
                JSONObject jsonObject = (JSONObject) new JSONParser().parse(response.toString());
                JSONArray resultsArray = (JSONArray) jsonObject.get("results");
                Map<String, SuggestionItem> autosuggests = new HashMap<String, SuggestionItem>();
                for (Object element : resultsArray) {
                        JSONObject tmpElement = (JSONObject) element;
                        String uriValue = (String) tmpElement.get("uri");
                        autosuggests.put(uriValue, new SuggestionItem(uriValue));
                        SuggestionItem tmpAutosuggest = autosuggests.get(uriValue);
                        String labelValue = (String) tmpElement.get("label");
                        tmpAutosuggest.setLabel(labelValue);
                        String descriptionValue = (String) tmpElement.get("description");
                        if (descriptionValue != null) {
                                tmpAutosuggest.setDescription(descriptionValue);
                        }
                        tmpAutosuggest.setSchemeTitle("DBpedia");
                        // get retcat info
                        String type = "dbpedia";
                        String quality = "";
                        String group = "";
                        for (RetcatItem item : LocalRetcatItems.getLocalCatalogue()) {
                                if (item.getType().equals(type)) {
                                        quality = item.getQuality();
                                        group = item.getGroup();
                                }
                        }
                        tmpAutosuggest.setType(type);
                        tmpAutosuggest.setQuality(quality);
                        tmpAutosuggest.setGroup(group);
                }
                return autosuggests;
        }

References GeneralFunctions.encodeURIComponent(), RetcatResource.getLimit(), and LocalRetcatItems.getLocalCatalogue().

Referenced by RetcatResource.getQueryResultsDBPEDIA().