public static UserAgent getInstance()

in tobago-core/src/main/java/org/apache/myfaces/tobago/context/UserAgent.java [280:335]
54 lines of code
20 McCabe index (conditional complexity)

  public static UserAgent getInstance(final String header) {
    if (header == null) {
      return DEFAULT;
    }

    if (header.contains("MSIE") || header.contains("Trident")) {
      if (header.contains("MSIE 6.0")) {
        return MSIE_6_0;
      } else if (header.contains("MSIE 7.0")) {
        if (header.contains("Trident")) {
          return MSIE_7_0_COMPAT;
        } else {
          return MSIE_7_0;
        }
      } else if (header.contains("MSIE 8.0")) {
        return MSIE_8_0;
      } else if (header.contains("MSIE 9.0")) {
        return MSIE_9_0;
      } else if (header.contains("MSIE 10.0")) {
        return MSIE_10_0;
      } else if (header.contains("rv:11")) {
        return MSIE_11_0;
      } else {
        return MSIE;
      }
    } else if (header.contains("AppleWebKit")) {
      return WEBKIT;
    } else if (header.contains("Gecko")) {
      if (header.contains("rv:1.8")) {
        return GECKO_1_8;
      } else if (header.contains("rv:1.9")) {
        return GECKO_1_9;
      } else {
        final int index = header.indexOf("rv:");
        final StringTokenizer tokenizer = new StringTokenizer(header.substring(index + 3), " .");
        final String versionString = tokenizer.nextToken();
        try {
          final int version = Integer.parseInt(versionString);
          if (version >= 23) {
            return GECKO_23_0;
          } else if (version >= 2) {
            return GECKO_2_0;
          }
        } catch (final NumberFormatException e) {
          if (LOG.isDebugEnabled()) {
            LOG.debug(header, e);
          }
        }
        return GECKO;
      }
    } else if (header.contains("Presto")) {
      return PRESTO;
    }

    return DEFAULT;
  }