// See http://www.unicode.org/reports/tr35/#Date_Format_Patterns for the different counts.
// @param generalTimeZone "GMT-08:00" rather than "-0800".
private void appendNumericTimeZone(StringBuffer buffer, int count, boolean generalTimeZone) {
int offset = calendar.get(Calendar.ZONE_OFFSET) + calendar.get(Calendar.DST_OFFSET);
char sign = '+';
if (offset < 0) {
sign = '-';
offset = -offset;
}
if (generalTimeZone || count == 4) {
buffer.append("GMT");
}
buffer.append(sign);
appendNumber(buffer, 2, offset / 3600000);
if (generalTimeZone || count >= 4) {
buffer.append(':');
}
appendNumber(buffer, 2, (offset % 3600000) / 60000);
}
// See http://www.unicode.org/reports/tr35/#Date_Format_Patterns for the different counts.
private void appendMonth(StringBuffer buffer, int count, boolean standAlone) {
int month = calendar.get(Calendar.MONTH);
if (count <= 2) {
appendNumber(buffer, count, month + 1);
return;
}
String[] months;
LocaleData ld = formatData.localeData;
if (count == 4) {
months = standAlone ? ld.longStandAloneMonthNames : formatData.months;
} else if (count == 5) {
months = standAlone ? ld.tinyStandAloneMonthNames : ld.tinyMonthNames;
} else {
months = standAlone ? ld.shortStandAloneMonthNames : formatData.shortMonths;
}
buffer.append(months[month]);
}
private void append(
StringBuffer buffer,
FieldPosition position,
List<FieldPosition> fields,
char format,
int count) {
int field = -1;
int index = PATTERN_CHARS.indexOf(format);
if (index == -1) {
throw new IllegalArgumentException("Unknown pattern character '" + format + "'");
}
int beginPosition = buffer.length();
Field dateFormatField = null;
switch (index) {
case ERA_FIELD:
dateFormatField = Field.ERA;
buffer.append(formatData.eras[calendar.get(Calendar.ERA)]);
break;
case YEAR_FIELD:
dateFormatField = Field.YEAR;
int year = calendar.get(Calendar.YEAR);
/*
* For 'y' and 'yyy', we're consistent with Unicode and previous releases
* of Android. But this means we're inconsistent with the RI.
* http://unicode.org/reports/tr35/
*/
if (count == 2) {
appendNumber(buffer, 2, year % 100);
} else {
appendNumber(buffer, count, year);
}
break;
case STAND_ALONE_MONTH_FIELD: // 'L'
dateFormatField = Field.MONTH;
appendMonth(buffer, count, true);
break;
case MONTH_FIELD: // 'M'
dateFormatField = Field.MONTH;
appendMonth(buffer, count, false);
break;
case DATE_FIELD:
dateFormatField = Field.DAY_OF_MONTH;
field = Calendar.DATE;
break;
case HOUR_OF_DAY1_FIELD: // 'k'
dateFormatField = Field.HOUR_OF_DAY1;
int hour = calendar.get(Calendar.HOUR_OF_DAY);
appendNumber(buffer, count, hour == 0 ? 24 : hour);
break;
case HOUR_OF_DAY0_FIELD: // 'H'
dateFormatField = Field.HOUR_OF_DAY0;
field = Calendar.HOUR_OF_DAY;
break;
case MINUTE_FIELD:
dateFormatField = Field.MINUTE;
field = Calendar.MINUTE;
break;
case SECOND_FIELD:
dateFormatField = Field.SECOND;
field = Calendar.SECOND;
break;
case MILLISECOND_FIELD:
dateFormatField = Field.MILLISECOND;
int value = calendar.get(Calendar.MILLISECOND);
appendNumber(buffer, count, value);
break;
case STAND_ALONE_DAY_OF_WEEK_FIELD:
dateFormatField = Field.DAY_OF_WEEK;
appendDayOfWeek(buffer, count, true);
break;
case DAY_OF_WEEK_FIELD:
dateFormatField = Field.DAY_OF_WEEK;
appendDayOfWeek(buffer, count, false);
break;
case DAY_OF_YEAR_FIELD:
dateFormatField = Field.DAY_OF_YEAR;
field = Calendar.DAY_OF_YEAR;
break;
case DAY_OF_WEEK_IN_MONTH_FIELD:
dateFormatField = Field.DAY_OF_WEEK_IN_MONTH;
field = Calendar.DAY_OF_WEEK_IN_MONTH;
break;
case WEEK_OF_YEAR_FIELD:
dateFormatField = Field.WEEK_OF_YEAR;
field = Calendar.WEEK_OF_YEAR;
break;
case WEEK_OF_MONTH_FIELD:
dateFormatField = Field.WEEK_OF_MONTH;
field = Calendar.WEEK_OF_MONTH;
break;
case AM_PM_FIELD:
dateFormatField = Field.AM_PM;
buffer.append(formatData.ampms[calendar.get(Calendar.AM_PM)]);
break;
case HOUR1_FIELD: // 'h'
dateFormatField = Field.HOUR1;
hour = calendar.get(Calendar.HOUR);
appendNumber(buffer, count, hour == 0 ? 12 : hour);
break;
case HOUR0_FIELD: // 'K'
dateFormatField = Field.HOUR0;
field = Calendar.HOUR;
break;
case TIMEZONE_FIELD: // 'z'
dateFormatField = Field.TIME_ZONE;
appendTimeZone(buffer, count, true);
break;
case RFC_822_TIMEZONE_FIELD: // 'Z'
dateFormatField = Field.TIME_ZONE;
appendNumericTimeZone(buffer, count, false);
break;
}
if (field != -1) {
appendNumber(buffer, count, calendar.get(field));
}
if (fields != null) {
position = new FieldPosition(dateFormatField);
position.setBeginIndex(beginPosition);
position.setEndIndex(buffer.length());
fields.add(position);
} else {
// Set to the first occurrence
if ((position.getFieldAttribute() == dateFormatField
|| (position.getFieldAttribute() == null && position.getField() == index))
&& position.getEndIndex() == 0) {
position.setBeginIndex(beginPosition);
position.setEndIndex(buffer.length());
}
}
}