public TimeZone getTimeZone()

in wicket-core/src/main/java/org/apache/wicket/protocol/http/ClientProperties.java [192:318]
102 lines of code
25 McCabe index (conditional complexity)

	public TimeZone getTimeZone()
	{
		if (timeZone == null && jsTimeZone != null)
		{
			TimeZone temptimeZone = TimeZone.getTimeZone(jsTimeZone);
			if (jsTimeZone.equals(temptimeZone.getID()))
			{
				timeZone = temptimeZone;
			}
		}
		if (timeZone == null)
		{
			String utc = getUtcOffset();
			if (utc != null)
			{
				// apparently it is platform dependent on whether you get the
				// offset in a decimal form or not. This parses the decimal
				// form of the UTC offset, taking into account several
				// possibilities
				// such as getting the format in +2.5 or -1.2

				int dotPos = utc.indexOf('.');
				if (dotPos >= 0)
				{
					String hours = utc.substring(0, dotPos);
					String hourPart = utc.substring(dotPos + 1);

					if (hours.startsWith("+"))
					{
						hours = hours.substring(1);
					}
					int offsetHours = Integer.parseInt(hours);
					int offsetMins = (int)(Double.parseDouble(hourPart) * 6);

					// construct a GMT timezone offset string from the retrieved
					// offset which can be parsed by the TimeZone class.

					AppendingStringBuffer sb = new AppendingStringBuffer("GMT");
					sb.append(offsetHours > 0 ? '+' : '-');
					sb.append(Math.abs(offsetHours));
					sb.append(':');
					if (offsetMins < 10)
					{
						sb.append('0');
					}
					sb.append(offsetMins);
					timeZone = TimeZone.getTimeZone(sb.toString());
				}
				else
				{
					int offset = Integer.parseInt(utc);
					if (offset < 0)
					{
						utc = utc.substring(1);
					}
					timeZone = TimeZone.getTimeZone("GMT" + ((offset > 0) ? '+' : '-') + utc);
				}

				String dstOffset = getUtcDSTOffset();
				if (timeZone != null && dstOffset != null)
				{
					TimeZone dstTimeZone;
					dotPos = dstOffset.indexOf('.');
					if (dotPos >= 0)
					{
						String hours = dstOffset.substring(0, dotPos);
						String hourPart = dstOffset.substring(dotPos + 1);

						if (hours.startsWith("+"))
						{
							hours = hours.substring(1);
						}
						int offsetHours = Integer.parseInt(hours);
						int offsetMins = (int)(Double.parseDouble(hourPart) * 6);

						// construct a GMT timezone offset string from the
						// retrieved
						// offset which can be parsed by the TimeZone class.

						AppendingStringBuffer sb = new AppendingStringBuffer("GMT");
						sb.append(offsetHours > 0 ? '+' : '-');
						sb.append(Math.abs(offsetHours));
						sb.append(':');
						if (offsetMins < 10)
						{
							sb.append('0');
						}
						sb.append(offsetMins);
						dstTimeZone = TimeZone.getTimeZone(sb.toString());
					}
					else
					{
						int offset = Integer.parseInt(dstOffset);
						if (offset < 0)
						{
							dstOffset = dstOffset.substring(1);
						}
						dstTimeZone = TimeZone.getTimeZone("GMT" + ((offset > 0) ? '+' : '-') +
							dstOffset);
					}
					// if the dstTimezone (1 July) has a different offset then
					// the real time zone (1 January) try to combine the 2.
					if (dstTimeZone != null &&
						dstTimeZone.getRawOffset() != timeZone.getRawOffset())
					{
						int dstSaving = Math.abs(dstTimeZone.getRawOffset() - timeZone.getRawOffset());
						String[] availableIDs = TimeZone.getAvailableIDs(dstTimeZone.getRawOffset() < timeZone.getRawOffset() ? dstTimeZone.getRawOffset() : timeZone.getRawOffset());
						for (String availableID : availableIDs)
						{
							TimeZone zone = TimeZone.getTimeZone(availableID);
							if (zone.getDSTSavings() == dstSaving)
							{
								// this is a best guess... still the start and end of the DST should
								// be needed to know to be completely correct, or better yet
								// not just the GMT offset but the TimeZone ID should be transfered
								// from the browser.
								timeZone = zone;
								break;
							}
						}
					}
				}
			}
		}

		return timeZone;
	}