/** * Parse the value of an <code>Accept-Language</code> header, and add the corresponding Locales to * the current request. * * @param value The value of the <code>Accept-Language</code> header. */ private void parseAcceptLanguage(String value) { // Store the accumulated languages that have been requested in // a local collection, sorted by the quality value (so we can // add Locales in descending order). The values will be ArrayLists // containing the corresponding Locales to be added TreeMap locales = new TreeMap(); // Preprocess the value to remove all whitespace int white = value.indexOf(' '); if (white < 0) white = value.indexOf('\t'); if (white >= 0) { StringBuffer sb = new StringBuffer(); int len = value.length(); for (int i = 0; i < len; i++) { char ch = value.charAt(i); if ((ch != ' ') && (ch != '\t')) sb.append(ch); } value = sb.toString(); } // Process each comma-delimited language specification parser.setString(value); // ASSERT: parser is available to us int length = parser.getLength(); while (true) { // Extract the next comma-delimited entry int start = parser.getIndex(); if (start >= length) break; int end = parser.findChar(','); String entry = parser.extract(start, end).trim(); parser.advance(); // For the following entry // Extract the quality factor for this entry double quality = 1.0; int semi = entry.indexOf(";q="); if (semi >= 0) { try { quality = Double.parseDouble(entry.substring(semi + 3)); } catch (NumberFormatException e) { quality = 0.0; } entry = entry.substring(0, semi); } // Skip entries we are not going to keep track of if (quality < 0.00005) continue; // Zero (or effectively zero) quality factors if ("*".equals(entry)) continue; // FIXME - "*" entries are not handled // Extract the language and country for this entry String language = null; String country = null; String variant = null; int dash = entry.indexOf('-'); if (dash < 0) { language = entry; country = ""; variant = ""; } else { language = entry.substring(0, dash); country = entry.substring(dash + 1); int vDash = country.indexOf('-'); if (vDash > 0) { String cTemp = country.substring(0, vDash); variant = country.substring(vDash + 1); country = cTemp; } else { variant = ""; } } // Add a new Locale to the list of Locales for this quality level Locale locale = new Locale(language, country, variant); Double key = new Double(-quality); // Reverse the order ArrayList values = (ArrayList) locales.get(key); if (values == null) { values = new ArrayList(); locales.put(key, values); } values.add(locale); } // Process the quality values in highest->lowest order (due to // negating the Double value when creating the key) Iterator keys = locales.keySet().iterator(); while (keys.hasNext()) { Double key = (Double) keys.next(); ArrayList list = (ArrayList) locales.get(key); Iterator values = list.iterator(); while (values.hasNext()) { Locale locale = (Locale) values.next(); if (debug >= 1) log(" Adding locale '" + locale + "'"); request.addLocale(locale); } } }