public JSONObject getByArticleId(final String articleId) throws RepositoryException {
final Query query = new Query();
query.addFilter(Article.ARTICLE + "_" + Keys.OBJECT_ID, FilterOperator.EQUAL, articleId);
final JSONObject result = get(query);
final JSONArray array = result.optJSONArray(Keys.RESULTS);
if (0 == array.length()) {
return null;
}
return array.optJSONObject(0);