private void initQueryMap(String city, String language, String units, Integer numberOfDaysAhead) {
        queryMap.put(NUMBER_OF_DAYS_AHEAD_QUERY, numberOfDaysAhead);
        queryMap.put(LANGUAGE_QUERY, language);
        queryMap.put(CITY_QUERY, city);
        queryMap.put(UNITS_QUERY, units);
    }

    private String getQueryAccordingToPresentParameters() {
        StringBuilder query = new StringBuilder();
        for (Map.Entry<String, Object> entry : queryMap.entrySet()) {
            if (entry.getValue() != null) {
                query.append(entry.getKey()).append("=").append(entry.getValue()).append("&");
            }
        }

        return query.substring(0, query.length() - 1);
    }