private List<JSONObject> getRelevantArticles(
final String articleId, final String articleTagsString,
final JSONObject preference)
throws JSONException, RepositoryException {
if (null == preference) {
throw new RepositoryException("Not found preference");
}
final int displayCnt =
preference.getInt(Preference.RELEVANT_ARTICLES_DISPLAY_CNT);
final String[] tagTitles = articleTagsString.split(",");