/**
* Converts a XingCalendar object into a String with the format "yyyy-MM-ddThh:mm:ssZ". Useful to
* save dates into the database, easily convertible to XingCalendar again with
* com.xing.android.sdk.model.DateUtils.parseCalendarFromString(String ); It is possible to do the
* same with a DateFormat, but due to the issues on DateFormat on API 15 and the simplicity of the
* implementation, it's better to use our own one.
*
* @param calendar The XingCalendar to convert.
* @return The String with the timestamp.
*/
public static String calendarToTimestamp(@NonNull XingCalendar calendar) {
String output = null;
if (calendar.isSet(Calendar.YEAR)) {
StringBuilder stringBuilder = new StringBuilder();
stringBuilder.append(calendar.get(Calendar.YEAR));
if (calendar.isSet(Calendar.MONTH)) {
stringBuilder.append('-');
stringBuilder.append(TWO_DIGITS_FORMATTER.format(calendar.get(Calendar.MONTH) + 1));
if (calendar.isSet(Calendar.DAY_OF_MONTH)) {
stringBuilder.append('-');
stringBuilder.append(TWO_DIGITS_FORMATTER.format(calendar.get(Calendar.DAY_OF_MONTH)));
if (isFilledToTime(calendar)) {
stringBuilder.append('T');
stringBuilder.append(TWO_DIGITS_FORMATTER.format(calendar.get(Calendar.HOUR_OF_DAY)));
stringBuilder.append(':');
stringBuilder.append(TWO_DIGITS_FORMATTER.format(calendar.get(Calendar.MINUTE)));
stringBuilder.append(':');
stringBuilder.append(TWO_DIGITS_FORMATTER.format(calendar.get(Calendar.SECOND)));
stringBuilder.append('Z');
}
}
}
output = stringBuilder.toString();
}
return output;
}
/**
* Clear unused calendar fields by regular expression
*
* @param calendar The calendar to clear
* @param regEx The reg ex
*/
private static void clearCalendarByRegEx(XingCalendar calendar, String regEx) {
switch (regEx) {
case YEAR_DATE_FORMAT:
{
calendar.clear(Calendar.MONTH);
}
case YEAR_MONTH_DATE_FORMAT:
{
calendar.clear(Calendar.DAY_OF_MONTH);
}
case YEAR_MONTH_DAY_DATE_FORMAT:
{
calendar.clear(Calendar.HOUR);
calendar.clear(Calendar.MINUTE);
calendar.clear(Calendar.SECOND);
calendar.clear(Calendar.MILLISECOND);
}
}
}
/**
* Parse the string to a calendar instance
*
* @param dateStr The string to parse
* @return A calendar instance with the encoded date, or null if nothing can be extracted
*/
@Nullable
public static XingCalendar parseCalendarFromString(@Nullable String dateStr) {
// Return null if the date string is empty
if (TextUtils.isEmpty(dateStr)) {
return null;
}
// Read the format entry
DateFormat format = null;
for (Map.Entry<String, DateFormat> entry : DATE_FORMAT_MAP.entrySet()) {
if (dateStr.matches(entry.getKey())) {
format = entry.getValue();
break;
}
}
// No supported format
if (format == null) {
return null;
}
try {
// Try to parse the date
Date date = format.parse(dateStr);
// Create a calendar instance, clear it and set the received time
XingCalendar calendar = new XingCalendar();
calendar.clear();
calendar.setTime(date);
// Clear unnecessary fields form calendar
clearCalendarByRegEx(calendar, ((SimpleDateFormat) format).toPattern());
return calendar;
} catch (ParseException ex) {
return null;
}
}
/**
* Checks if a XingCalendar object has all the necessary fields set to generate a timeStamp. These
* fields are: year, month, day of month, hour of day, minute and second.
*
* @param calendar The XingCalendar to check.
* @return True if has all the fields set, false otherwise.
*/
private static boolean isFilledToTime(@NonNull XingCalendar calendar) {
return calendar.isSet(Calendar.HOUR_OF_DAY)
&& calendar.isSet(Calendar.MINUTE)
&& calendar.isSet(Calendar.SECOND);
}