Examples with TimeZone android.icu.util.TimeZone used on opensource projects

Example 66 with TimeZone

use of android.icu.util.TimeZone in project android_frameworks_opt_telephony by LineageOS.

the class TimeZoneLookupHelper method lookupByCountry.

/**
 * Returns information about the time zones used in a country at a given time.
 *
 * {@code null} can be returned if a problem occurs during lookup, e.g. if the country code is
 * unrecognized, if the country is uninhabited, or if there is a problem with the data.
 */
@VisibleForTesting
@Nullable
public CountryResult lookupByCountry(@NonNull String isoCountryCode, long whenMillis) {
    CountryTimeZones countryTimeZones = getCountryTimeZones(isoCountryCode);
    if (countryTimeZones == null) {
        // Unknown country code.
        return null;
    }
    TimeZone countryDefaultZone = countryTimeZones.getDefaultTimeZone();
    if (countryDefaultZone == null) {
        // This is not expected: the country default should have been validated before.
        return null;
    }
    String debugInfo;
    int matchQuality;
    if (countryTimeZones.isDefaultTimeZoneBoosted()) {
        matchQuality = CountryResult.QUALITY_DEFAULT_BOOSTED;
        debugInfo = "Country default is boosted";
    } else {
        List<TimeZoneMapping> effectiveTimeZoneMappings = countryTimeZones.getEffectiveTimeZoneMappingsAt(whenMillis);
        if (effectiveTimeZoneMappings.isEmpty()) {
            // This should never happen unless there's been an error loading the data.
            // Treat it the same as a low quality answer.
            matchQuality = QUALITY_MULTIPLE_ZONES_DIFFERENT_OFFSETS;
            debugInfo = "No effective time zones found at whenMillis=" + whenMillis;
        } else if (effectiveTimeZoneMappings.size() == 1) {
            // The default is the only zone so it's a good candidate.
            matchQuality = CountryResult.QUALITY_SINGLE_ZONE;
            debugInfo = "One effective time zone found at whenMillis=" + whenMillis;
        } else {
            boolean countryUsesDifferentOffsets = countryUsesDifferentOffsets(whenMillis, effectiveTimeZoneMappings, countryDefaultZone);
            matchQuality = countryUsesDifferentOffsets ? QUALITY_MULTIPLE_ZONES_DIFFERENT_OFFSETS : QUALITY_MULTIPLE_ZONES_SAME_OFFSET;
            debugInfo = "countryUsesDifferentOffsets=" + countryUsesDifferentOffsets + " at" + " whenMillis=" + whenMillis;
        }
    }
    return new CountryResult(countryDefaultZone.getID(), matchQuality, debugInfo);
}

Example 67 with TimeZone

use of android.icu.util.TimeZone in project android_packages_apps_Settings by omnirom.

the class RegionZonePicker method getRegionTimeZoneInfo.

/**
 * Returns a list of {@link TimeZoneInfo} objects. The returned list will be sorted properly for
 * display in the locale.It may be smaller than the input collection, if equivalent IDs are
 * passed in.
 *
 * @param timeZoneIds a list of Olson IDs.
 */
public List<TimeZoneInfo> getRegionTimeZoneInfo(Collection<String> timeZoneIds) {
    final TimeZoneInfo.Formatter formatter = new TimeZoneInfo.Formatter(getLocale(), new Date());
    final TreeSet<TimeZoneInfo> timeZoneInfos = new TreeSet<>(new TimeZoneInfoComparator(Collator.getInstance(getLocale()), new Date()));
    for (final String timeZoneId : timeZoneIds) {
        final TimeZone timeZone = TimeZone.getFrozenTimeZone(timeZoneId);
        // Skip time zone ICU isn't aware.
        if (timeZone.getID().equals(TimeZone.UNKNOWN_ZONE_ID)) {
            continue;
        }
        timeZoneInfos.add(formatter.format(timeZone));
    }
    return Collections.unmodifiableList(new ArrayList<>(timeZoneInfos));
}

Example 68 with TimeZone

use of android.icu.util.TimeZone in project j2objc by google.

the class TimeZoneFormat method parse.

/**
 * Returns a <code>TimeZone</code> by parsing the time zone string according to
 * the parse position, the style and the parse options.
 *
 * @param text the text contains a time zone string at the position.
 * @param style the format style.
 * @param pos the position.
 * @param options the parse options.
 * @param timeType The output argument for receiving the time type (standard/daylight/unknown),
 * or specify null if the information is not necessary.
 * @return A <code>TimeZone</code>, or null if the input could not be parsed.
 * @see Style
 * @see #format(Style, TimeZone, long, Output)
 */
public TimeZone parse(Style style, String text, ParsePosition pos, EnumSet<ParseOption> options, Output<TimeType> timeType) {
    if (timeType == null) {
        timeType = new Output<TimeType>(TimeType.UNKNOWN);
    } else {
        timeType.value = TimeType.UNKNOWN;
    }
    int startIdx = pos.getIndex();
    int maxPos = text.length();
    int offset;
    // Styles using localized GMT format as fallback
    boolean fallbackLocalizedGMT = (style == Style.SPECIFIC_LONG || style == Style.GENERIC_LONG || style == Style.GENERIC_LOCATION);
    boolean fallbackShortLocalizedGMT = (style == Style.SPECIFIC_SHORT || style == Style.GENERIC_SHORT);
    // bit flags representing already evaluated styles
    int evaluated = 0;
    ParsePosition tmpPos = new ParsePosition(startIdx);
    // stores successfully parsed offset for later use
    int parsedOffset = UNKNOWN_OFFSET;
    // stores successfully parsed offset position for later use
    int parsedPos = -1;
    // Try localized GMT format first if necessary
    if (fallbackLocalizedGMT || fallbackShortLocalizedGMT) {
        Output<Boolean> hasDigitOffset = new Output<Boolean>(false);
        offset = parseOffsetLocalizedGMT(text, tmpPos, fallbackShortLocalizedGMT, hasDigitOffset);
        if (tmpPos.getErrorIndex() == -1) {
            // 2) The input text was not completely processed
            if (tmpPos.getIndex() == maxPos || hasDigitOffset.value) {
                pos.setIndex(tmpPos.getIndex());
                return getTimeZoneForOffset(offset);
            }
            parsedOffset = offset;
            parsedPos = tmpPos.getIndex();
        }
        // Note: For now, no distinction between long/short localized GMT format in the parser.
        // This might be changed in future.
        // evaluated |= (fallbackLocalizedGMT ? Style.LOCALIZED_GMT.flag : Style.LOCALIZED_GMT_SHORT.flag);
        evaluated |= (Style.LOCALIZED_GMT.flag | Style.LOCALIZED_GMT_SHORT.flag);
    }
    boolean parseTZDBAbbrev = (options == null) ? getDefaultParseOptions().contains(ParseOption.TZ_DATABASE_ABBREVIATIONS) : options.contains(ParseOption.TZ_DATABASE_ABBREVIATIONS);
    // Try the specified style
    switch(style) {
        case LOCALIZED_GMT:
            {
                tmpPos.setIndex(startIdx);
                tmpPos.setErrorIndex(-1);
                offset = parseOffsetLocalizedGMT(text, tmpPos);
                if (tmpPos.getErrorIndex() == -1) {
                    pos.setIndex(tmpPos.getIndex());
                    return getTimeZoneForOffset(offset);
                }
                // Note: For now, no distinction between long/short localized GMT format in the parser.
                // This might be changed in future.
                evaluated |= Style.LOCALIZED_GMT_SHORT.flag;
                break;
            }
        case LOCALIZED_GMT_SHORT:
            {
                tmpPos.setIndex(startIdx);
                tmpPos.setErrorIndex(-1);
                offset = parseOffsetShortLocalizedGMT(text, tmpPos);
                if (tmpPos.getErrorIndex() == -1) {
                    pos.setIndex(tmpPos.getIndex());
                    return getTimeZoneForOffset(offset);
                }
                // Note: For now, no distinction between long/short localized GMT format in the parser.
                // This might be changed in future.
                evaluated |= Style.LOCALIZED_GMT.flag;
                break;
            }
        case ISO_BASIC_SHORT:
        case ISO_BASIC_FIXED:
        case ISO_BASIC_FULL:
        case ISO_EXTENDED_FIXED:
        case ISO_EXTENDED_FULL:
            {
                tmpPos.setIndex(startIdx);
                tmpPos.setErrorIndex(-1);
                offset = parseOffsetISO8601(text, tmpPos);
                if (tmpPos.getErrorIndex() == -1) {
                    pos.setIndex(tmpPos.getIndex());
                    return getTimeZoneForOffset(offset);
                }
                break;
            }
        case ISO_BASIC_LOCAL_SHORT:
        case ISO_BASIC_LOCAL_FIXED:
        case ISO_BASIC_LOCAL_FULL:
        case ISO_EXTENDED_LOCAL_FIXED:
        case ISO_EXTENDED_LOCAL_FULL:
            {
                tmpPos.setIndex(startIdx);
                tmpPos.setErrorIndex(-1);
                // Exclude the case of UTC Indicator "Z" here
                Output<Boolean> hasDigitOffset = new Output<Boolean>(false);
                offset = parseOffsetISO8601(text, tmpPos, false, hasDigitOffset);
                if (tmpPos.getErrorIndex() == -1 && hasDigitOffset.value) {
                    pos.setIndex(tmpPos.getIndex());
                    return getTimeZoneForOffset(offset);
                }
                break;
            }
        case SPECIFIC_LONG:
        case SPECIFIC_SHORT:
            {
                // Specific styles
                EnumSet<NameType> nameTypes = null;
                if (style == Style.SPECIFIC_LONG) {
                    nameTypes = EnumSet.of(NameType.LONG_STANDARD, NameType.LONG_DAYLIGHT);
                } else {
                    assert style == Style.SPECIFIC_SHORT;
                    nameTypes = EnumSet.of(NameType.SHORT_STANDARD, NameType.SHORT_DAYLIGHT);
                }
                Collection<MatchInfo> specificMatches = _tznames.find(text, startIdx, nameTypes);
                if (specificMatches != null) {
                    MatchInfo specificMatch = null;
                    for (MatchInfo match : specificMatches) {
                        if (startIdx + match.matchLength() > parsedPos) {
                            specificMatch = match;
                            parsedPos = startIdx + match.matchLength();
                        }
                    }
                    if (specificMatch != null) {
                        timeType.value = getTimeType(specificMatch.nameType());
                        pos.setIndex(parsedPos);
                        return TimeZone.getTimeZone(getTimeZoneID(specificMatch.tzID(), specificMatch.mzID()));
                    }
                }
                if (parseTZDBAbbrev && style == Style.SPECIFIC_SHORT) {
                    assert nameTypes.contains(NameType.SHORT_STANDARD);
                    assert nameTypes.contains(NameType.SHORT_DAYLIGHT);
                    Collection<MatchInfo> tzdbNameMatches = getTZDBTimeZoneNames().find(text, startIdx, nameTypes);
                    if (tzdbNameMatches != null) {
                        MatchInfo tzdbNameMatch = null;
                        for (MatchInfo match : tzdbNameMatches) {
                            if (startIdx + match.matchLength() > parsedPos) {
                                tzdbNameMatch = match;
                                parsedPos = startIdx + match.matchLength();
                            }
                        }
                        if (tzdbNameMatch != null) {
                            timeType.value = getTimeType(tzdbNameMatch.nameType());
                            pos.setIndex(parsedPos);
                            return TimeZone.getTimeZone(getTimeZoneID(tzdbNameMatch.tzID(), tzdbNameMatch.mzID()));
                        }
                    }
                }
                break;
            }
        case GENERIC_LONG:
        case GENERIC_SHORT:
        case GENERIC_LOCATION:
            {
                EnumSet<GenericNameType> genericNameTypes = null;
                switch(style) {
                    case GENERIC_LOCATION:
                        genericNameTypes = EnumSet.of(GenericNameType.LOCATION);
                        break;
                    case GENERIC_LONG:
                        genericNameTypes = EnumSet.of(GenericNameType.LONG, GenericNameType.LOCATION);
                        break;
                    case GENERIC_SHORT:
                        genericNameTypes = EnumSet.of(GenericNameType.SHORT, GenericNameType.LOCATION);
                        break;
                    default:
                        // style cannot be other than above cases
                        assert false;
                        break;
                }
                GenericMatchInfo bestGeneric = getTimeZoneGenericNames().findBestMatch(text, startIdx, genericNameTypes);
                if (bestGeneric != null && (startIdx + bestGeneric.matchLength() > parsedPos)) {
                    timeType.value = bestGeneric.timeType();
                    pos.setIndex(startIdx + bestGeneric.matchLength());
                    return TimeZone.getTimeZone(bestGeneric.tzID());
                }
                break;
            }
        case ZONE_ID:
            {
                tmpPos.setIndex(startIdx);
                tmpPos.setErrorIndex(-1);
                String id = parseZoneID(text, tmpPos);
                if (tmpPos.getErrorIndex() == -1) {
                    pos.setIndex(tmpPos.getIndex());
                    return TimeZone.getTimeZone(id);
                }
                break;
            }
        case ZONE_ID_SHORT:
            {
                tmpPos.setIndex(startIdx);
                tmpPos.setErrorIndex(-1);
                String id = parseShortZoneID(text, tmpPos);
                if (tmpPos.getErrorIndex() == -1) {
                    pos.setIndex(tmpPos.getIndex());
                    return TimeZone.getTimeZone(id);
                }
                break;
            }
        case EXEMPLAR_LOCATION:
            {
                tmpPos.setIndex(startIdx);
                tmpPos.setErrorIndex(-1);
                String id = parseExemplarLocation(text, tmpPos);
                if (tmpPos.getErrorIndex() == -1) {
                    pos.setIndex(tmpPos.getIndex());
                    return TimeZone.getTimeZone(id);
                }
                break;
            }
    }
    evaluated |= style.flag;
    if (parsedPos > startIdx) {
        // GMT format.
        assert parsedOffset != UNKNOWN_OFFSET;
        pos.setIndex(parsedPos);
        return getTimeZoneForOffset(parsedOffset);
    }
    // Failed to parse the input text as the time zone format in the specified style.
    // Check the longest match among other styles below.
    // stores successfully parsed zone ID for later use
    String parsedID = null;
    // stores successfully parsed time type for later use
    TimeType parsedTimeType = TimeType.UNKNOWN;
    assert parsedPos < 0;
    assert parsedOffset == UNKNOWN_OFFSET;
    // ISO 8601
    if (parsedPos < maxPos && ((evaluated & ISO_Z_STYLE_FLAG) == 0 || (evaluated & ISO_LOCAL_STYLE_FLAG) == 0)) {
        tmpPos.setIndex(startIdx);
        tmpPos.setErrorIndex(-1);
        Output<Boolean> hasDigitOffset = new Output<Boolean>(false);
        offset = parseOffsetISO8601(text, tmpPos, false, hasDigitOffset);
        if (tmpPos.getErrorIndex() == -1) {
            if (tmpPos.getIndex() == maxPos || hasDigitOffset.value) {
                pos.setIndex(tmpPos.getIndex());
                return getTimeZoneForOffset(offset);
            }
            // may collide with other names. In this case, we need to evaluate other names.
            if (parsedPos < tmpPos.getIndex()) {
                parsedOffset = offset;
                parsedID = null;
                parsedTimeType = TimeType.UNKNOWN;
                parsedPos = tmpPos.getIndex();
                // only when "Z" is used
                assert parsedPos == startIdx + 1;
            }
        }
    }
    // Localized GMT format
    if (parsedPos < maxPos && (evaluated & Style.LOCALIZED_GMT.flag) == 0) {
        tmpPos.setIndex(startIdx);
        tmpPos.setErrorIndex(-1);
        Output<Boolean> hasDigitOffset = new Output<Boolean>(false);
        offset = parseOffsetLocalizedGMT(text, tmpPos, false, hasDigitOffset);
        if (tmpPos.getErrorIndex() == -1) {
            if (tmpPos.getIndex() == maxPos || hasDigitOffset.value) {
                pos.setIndex(tmpPos.getIndex());
                return getTimeZoneForOffset(offset);
            }
            // Evaluate other names - see the comment earlier in this method.
            if (parsedPos < tmpPos.getIndex()) {
                parsedOffset = offset;
                parsedID = null;
                parsedTimeType = TimeType.UNKNOWN;
                parsedPos = tmpPos.getIndex();
            }
        }
    }
    if (parsedPos < maxPos && (evaluated & Style.LOCALIZED_GMT_SHORT.flag) == 0) {
        tmpPos.setIndex(startIdx);
        tmpPos.setErrorIndex(-1);
        Output<Boolean> hasDigitOffset = new Output<Boolean>(false);
        offset = parseOffsetLocalizedGMT(text, tmpPos, true, hasDigitOffset);
        if (tmpPos.getErrorIndex() == -1) {
            if (tmpPos.getIndex() == maxPos || hasDigitOffset.value) {
                pos.setIndex(tmpPos.getIndex());
                return getTimeZoneForOffset(offset);
            }
            // Evaluate other names - see the comment earlier in this method.
            if (parsedPos < tmpPos.getIndex()) {
                parsedOffset = offset;
                parsedID = null;
                parsedTimeType = TimeType.UNKNOWN;
                parsedPos = tmpPos.getIndex();
            }
        }
    }
    // When ParseOption.ALL_STYLES is available, we also try to look all possible display names and IDs.
    // For example, when style is GENERIC_LONG, "EST" (SPECIFIC_SHORT) is never
    // used for America/New_York. With parseAllStyles true, this code parses "EST"
    // as America/New_York.
    // Note: Adding all possible names into the trie used by the implementation is quite heavy operation,
    // which we want to avoid normally (note that we cache the trie, so this is applicable to the
    // first time only as long as the cache does not expire).
    boolean parseAllStyles = (options == null) ? getDefaultParseOptions().contains(ParseOption.ALL_STYLES) : options.contains(ParseOption.ALL_STYLES);
    if (parseAllStyles) {
        // Try all specific names and exemplar location names
        if (parsedPos < maxPos) {
            Collection<MatchInfo> specificMatches = _tznames.find(text, startIdx, ALL_SIMPLE_NAME_TYPES);
            MatchInfo specificMatch = null;
            int matchPos = -1;
            if (specificMatches != null) {
                for (MatchInfo match : specificMatches) {
                    if (startIdx + match.matchLength() > matchPos) {
                        specificMatch = match;
                        matchPos = startIdx + match.matchLength();
                    }
                }
            }
            if (parsedPos < matchPos) {
                parsedPos = matchPos;
                parsedID = getTimeZoneID(specificMatch.tzID(), specificMatch.mzID());
                parsedTimeType = getTimeType(specificMatch.nameType());
                parsedOffset = UNKNOWN_OFFSET;
            }
        }
        if (parseTZDBAbbrev && parsedPos < maxPos && (evaluated & Style.SPECIFIC_SHORT.flag) == 0) {
            Collection<MatchInfo> tzdbNameMatches = getTZDBTimeZoneNames().find(text, startIdx, ALL_SIMPLE_NAME_TYPES);
            MatchInfo tzdbNameMatch = null;
            int matchPos = -1;
            if (tzdbNameMatches != null) {
                for (MatchInfo match : tzdbNameMatches) {
                    if (startIdx + match.matchLength() > matchPos) {
                        tzdbNameMatch = match;
                        matchPos = startIdx + match.matchLength();
                    }
                }
                if (parsedPos < matchPos) {
                    parsedPos = matchPos;
                    parsedID = getTimeZoneID(tzdbNameMatch.tzID(), tzdbNameMatch.mzID());
                    parsedTimeType = getTimeType(tzdbNameMatch.nameType());
                    parsedOffset = UNKNOWN_OFFSET;
                }
            }
        }
        // Try generic names
        if (parsedPos < maxPos) {
            GenericMatchInfo genericMatch = getTimeZoneGenericNames().findBestMatch(text, startIdx, ALL_GENERIC_NAME_TYPES);
            if (genericMatch != null && parsedPos < startIdx + genericMatch.matchLength()) {
                parsedPos = startIdx + genericMatch.matchLength();
                parsedID = genericMatch.tzID();
                parsedTimeType = genericMatch.timeType();
                parsedOffset = UNKNOWN_OFFSET;
            }
        }
        // Try time zone ID
        if (parsedPos < maxPos && (evaluated & Style.ZONE_ID.flag) == 0) {
            tmpPos.setIndex(startIdx);
            tmpPos.setErrorIndex(-1);
            String id = parseZoneID(text, tmpPos);
            if (tmpPos.getErrorIndex() == -1 && parsedPos < tmpPos.getIndex()) {
                parsedPos = tmpPos.getIndex();
                parsedID = id;
                parsedTimeType = TimeType.UNKNOWN;
                parsedOffset = UNKNOWN_OFFSET;
            }
        }
        // Try short time zone ID
        if (parsedPos < maxPos && (evaluated & Style.ZONE_ID_SHORT.flag) == 0) {
            tmpPos.setIndex(startIdx);
            tmpPos.setErrorIndex(-1);
            String id = parseShortZoneID(text, tmpPos);
            if (tmpPos.getErrorIndex() == -1 && parsedPos < tmpPos.getIndex()) {
                parsedPos = tmpPos.getIndex();
                parsedID = id;
                parsedTimeType = TimeType.UNKNOWN;
                parsedOffset = UNKNOWN_OFFSET;
            }
        }
    }
    if (parsedPos > startIdx) {
        // Parsed successfully
        TimeZone parsedTZ = null;
        if (parsedID != null) {
            parsedTZ = TimeZone.getTimeZone(parsedID);
        } else {
            assert parsedOffset != UNKNOWN_OFFSET;
            parsedTZ = getTimeZoneForOffset(parsedOffset);
        }
        timeType.value = parsedTimeType;
        pos.setIndex(parsedPos);
        return parsedTZ;
    }
    pos.setErrorIndex(startIdx);
    return null;
}

Example 69 with TimeZone

use of android.icu.util.TimeZone in project j2objc by google.

the class SimpleDateFormat method parse.

/**
 * Overrides DateFormat
 * @see DateFormat
 */
@Override
public void parse(String text, Calendar cal, ParsePosition parsePos) {
    TimeZone backupTZ = null;
    Calendar resultCal = null;
    if (cal != calendar && !cal.getType().equals(calendar.getType())) {
        // Different calendar type
        // We use the time/zone from the input calendar, but
        // do not use the input calendar for field calculation.
        calendar.setTimeInMillis(cal.getTimeInMillis());
        backupTZ = calendar.getTimeZone();
        calendar.setTimeZone(cal.getTimeZone());
        resultCal = cal;
        cal = calendar;
    }
    int pos = parsePos.getIndex();
    if (pos < 0) {
        parsePos.setErrorIndex(0);
        return;
    }
    int start = pos;
    // Hold the day period until everything else is parsed, because we need
    // the hour to interpret time correctly.
    // Using an one-element array for output parameter.
    Output<DayPeriodRules.DayPeriod> dayPeriod = new Output<DayPeriodRules.DayPeriod>(null);
    Output<TimeType> tzTimeType = new Output<TimeType>(TimeType.UNKNOWN);
    boolean[] ambiguousYear = { false };
    // item index for the first numeric field within a contiguous numeric run
    int numericFieldStart = -1;
    // item length for the first numeric field within a contiguous numeric run
    int numericFieldLength = 0;
    // start index of numeric text run in the input text
    int numericStartPos = 0;
    MessageFormat numericLeapMonthFormatter = null;
    if (formatData.leapMonthPatterns != null && formatData.leapMonthPatterns.length >= DateFormatSymbols.DT_MONTH_PATTERN_COUNT) {
        numericLeapMonthFormatter = new MessageFormat(formatData.leapMonthPatterns[DateFormatSymbols.DT_LEAP_MONTH_PATTERN_NUMERIC], locale);
    }
    Object[] items = getPatternItems();
    int i = 0;
    while (i < items.length) {
        if (items[i] instanceof PatternItem) {
            // Handle pattern field
            PatternItem field = (PatternItem) items[i];
            if (field.isNumeric) {
                // try 4/2/2, 3/2/2, 2/2/2, and finally 1/2/2.
                if (numericFieldStart == -1) {
                    // check if this field is followed by abutting another numeric field
                    if ((i + 1) < items.length && (items[i + 1] instanceof PatternItem) && ((PatternItem) items[i + 1]).isNumeric) {
                        // record the first numeric field within a numeric text run
                        numericFieldStart = i;
                        numericFieldLength = field.length;
                        numericStartPos = pos;
                    }
                }
            }
            if (numericFieldStart != -1) {
                // Handle a numeric field within abutting numeric fields
                int len = field.length;
                if (numericFieldStart == i) {
                    len = numericFieldLength;
                }
                // Parse a numeric field
                pos = subParse(text, pos, field.type, len, true, false, ambiguousYear, cal, numericLeapMonthFormatter, tzTimeType);
                if (pos < 0) {
                    // If the parse fails anywhere in the numeric run, back up to the
                    // start of the run and use shorter pattern length for the first
                    // numeric field.
                    --numericFieldLength;
                    if (numericFieldLength == 0) {
                        // can not make shorter any more
                        parsePos.setIndex(start);
                        parsePos.setErrorIndex(pos);
                        if (backupTZ != null) {
                            calendar.setTimeZone(backupTZ);
                        }
                        return;
                    }
                    i = numericFieldStart;
                    pos = numericStartPos;
                    continue;
                }
            } else if (field.type != 'l') {
                // (SMALL LETTER L) obsolete pattern char just gets ignored
                // Handle a non-numeric field or a non-abutting numeric field
                numericFieldStart = -1;
                int s = pos;
                pos = subParse(text, pos, field.type, field.length, false, true, ambiguousYear, cal, numericLeapMonthFormatter, tzTimeType, dayPeriod);
                if (pos < 0) {
                    if (pos == ISOSpecialEra) {
                        // era not present, in special cases allow this to continue
                        pos = s;
                        if (i + 1 < items.length) {
                            String patl = null;
                            // if it will cause a class cast exception to String, we can't use it
                            try {
                                patl = (String) items[i + 1];
                            } catch (ClassCastException cce) {
                                parsePos.setIndex(start);
                                parsePos.setErrorIndex(s);
                                if (backupTZ != null) {
                                    calendar.setTimeZone(backupTZ);
                                }
                                return;
                            }
                            // get next item in pattern
                            if (patl == null)
                                patl = (String) items[i + 1];
                            int plen = patl.length();
                            int idx = 0;
                            // Skip contiguous white spaces.
                            while (idx < plen) {
                                char pch = patl.charAt(idx);
                                if (PatternProps.isWhiteSpace(pch))
                                    idx++;
                                else
                                    break;
                            }
                            // if next item in pattern is all whitespace, skip it
                            if (idx == plen) {
                                i++;
                            }
                        }
                    } else {
                        parsePos.setIndex(start);
                        parsePos.setErrorIndex(s);
                        if (backupTZ != null) {
                            calendar.setTimeZone(backupTZ);
                        }
                        return;
                    }
                }
            }
        } else {
            // Handle literal pattern text literal
            numericFieldStart = -1;
            boolean[] complete = new boolean[1];
            pos = matchLiteral(text, pos, items, i, complete);
            if (!complete[0]) {
                // Set the position of mismatch
                parsePos.setIndex(start);
                parsePos.setErrorIndex(pos);
                if (backupTZ != null) {
                    calendar.setTimeZone(backupTZ);
                }
                return;
            }
        }
        ++i;
    }
    // Special hack for trailing "." after non-numeric field.
    if (pos < text.length()) {
        char extra = text.charAt(pos);
        if (extra == '.' && getBooleanAttribute(DateFormat.BooleanAttribute.PARSE_ALLOW_WHITESPACE) && items.length != 0) {
            // only do if the last field is not numeric
            Object lastItem = items[items.length - 1];
            if (lastItem instanceof PatternItem && !((PatternItem) lastItem).isNumeric) {
                // skip the extra "."
                pos++;
            }
        }
    }
    // If dayPeriod is set, use it in conjunction with hour-of-day to determine am/pm.
    if (dayPeriod.value != null) {
        DayPeriodRules ruleSet = DayPeriodRules.getInstance(getLocale());
        if (!cal.isSet(Calendar.HOUR) && !cal.isSet(Calendar.HOUR_OF_DAY)) {
            // If hour is not set, set time to the midpoint of current day period, overwriting
            // minutes if it's set.
            double midPoint = ruleSet.getMidPointForDayPeriod(dayPeriod.value);
            // Truncate midPoint toward zero to get the hour.
            // Any leftover means it was a half-hour.
            int midPointHour = (int) midPoint;
            int midPointMinute = (midPoint - midPointHour) > 0 ? 30 : 0;
            // No need to set am/pm because hour-of-day is set last therefore takes precedence.
            cal.set(Calendar.HOUR_OF_DAY, midPointHour);
            cal.set(Calendar.MINUTE, midPointMinute);
        } else {
            int hourOfDay;
            if (cal.isSet(Calendar.HOUR_OF_DAY)) {
                // Hour is parsed in 24-hour format.
                hourOfDay = cal.get(Calendar.HOUR_OF_DAY);
            } else {
                // Hour is parsed in 12-hour format.
                hourOfDay = cal.get(Calendar.HOUR);
                // so 0 unambiguously means a 24-hour time from above.
                if (hourOfDay == 0) {
                    hourOfDay = 12;
                }
            }
            assert (0 <= hourOfDay && hourOfDay <= 23);
            // If hour-of-day is 0 or 13 thru 23 then input time in unambiguously in 24-hour format.
            if (hourOfDay == 0 || (13 <= hourOfDay && hourOfDay <= 23)) {
                // Make hour-of-day take precedence over (hour + am/pm) by setting it again.
                cal.set(Calendar.HOUR_OF_DAY, hourOfDay);
            } else {
                // - cal.get(MINUTE) will return 0 if MINUTE is unset, which works.
                if (hourOfDay == 12) {
                    hourOfDay = 0;
                }
                double currentHour = hourOfDay + cal.get(Calendar.MINUTE) / 60.0;
                double midPointHour = ruleSet.getMidPointForDayPeriod(dayPeriod.value);
                double hoursAheadMidPoint = currentHour - midPointHour;
                // Assume current time is in the AM.
                if (-6 <= hoursAheadMidPoint && hoursAheadMidPoint < 6) {
                    // Assumption holds; set time as such.
                    cal.set(Calendar.AM_PM, 0);
                } else {
                    cal.set(Calendar.AM_PM, 1);
                }
            }
        }
    }
    // At this point the fields of Calendar have been set.  Calendar
    // will fill in default values for missing fields when the time
    // is computed.
    parsePos.setIndex(pos);
    // the year correctly to start with in other cases -- see subParse().
    try {
        TimeType tztype = tzTimeType.value;
        if (ambiguousYear[0] || tztype != TimeType.UNKNOWN) {
            // We need a copy of the fields, and we need to avoid triggering a call to
            // complete(), which will recalculate the fields.  Since we can't access
            // the fields[] array in Calendar, we clone the entire object.  This will
            // stop working if Calendar.clone() is ever rewritten to call complete().
            Calendar copy;
            if (ambiguousYear[0]) {
                // the two-digit year == the default start year
                copy = (Calendar) cal.clone();
                Date parsedDate = copy.getTime();
                if (parsedDate.before(getDefaultCenturyStart())) {
                    // We can't use add here because that does a complete() first.
                    cal.set(Calendar.YEAR, getDefaultCenturyStartYear() + 100);
                }
            }
            if (tztype != TimeType.UNKNOWN) {
                copy = (Calendar) cal.clone();
                TimeZone tz = copy.getTimeZone();
                BasicTimeZone btz = null;
                if (tz instanceof BasicTimeZone) {
                    btz = (BasicTimeZone) tz;
                }
                // Get local millis
                copy.set(Calendar.ZONE_OFFSET, 0);
                copy.set(Calendar.DST_OFFSET, 0);
                long localMillis = copy.getTimeInMillis();
                // Make sure parsed time zone type (Standard or Daylight)
                // matches the rule used by the parsed time zone.
                int[] offsets = new int[2];
                if (btz != null) {
                    if (tztype == TimeType.STANDARD) {
                        btz.getOffsetFromLocal(localMillis, BasicTimeZone.LOCAL_STD, BasicTimeZone.LOCAL_STD, offsets);
                    } else {
                        btz.getOffsetFromLocal(localMillis, BasicTimeZone.LOCAL_DST, BasicTimeZone.LOCAL_DST, offsets);
                    }
                } else {
                    // No good way to resolve ambiguous time at transition,
                    // but following code work in most case.
                    tz.getOffset(localMillis, true, offsets);
                    if (tztype == TimeType.STANDARD && offsets[1] != 0 || tztype == TimeType.DAYLIGHT && offsets[1] == 0) {
                        // Roll back one day and try it again.
                        // Note: This code assumes 1. timezone transition only happens
                        // once within 24 hours at max
                        // 2. the difference of local offsets at the transition is
                        // less than 24 hours.
                        tz.getOffset(localMillis - (24 * 60 * 60 * 1000), true, offsets);
                    }
                }
                // Now, compare the results with parsed type, either standard or
                // daylight saving time
                int resolvedSavings = offsets[1];
                if (tztype == TimeType.STANDARD) {
                    if (offsets[1] != 0) {
                        // Override DST_OFFSET = 0 in the result calendar
                        resolvedSavings = 0;
                    }
                } else {
                    // tztype == TZTYPE_DST
                    if (offsets[1] == 0) {
                        if (btz != null) {
                            long time = localMillis + offsets[0];
                            // We use the nearest daylight saving time rule.
                            TimeZoneTransition beforeTrs, afterTrs;
                            long beforeT = time, afterT = time;
                            int beforeSav = 0, afterSav = 0;
                            // Search for DST rule before or on the time
                            while (true) {
                                beforeTrs = btz.getPreviousTransition(beforeT, true);
                                if (beforeTrs == null) {
                                    break;
                                }
                                beforeT = beforeTrs.getTime() - 1;
                                beforeSav = beforeTrs.getFrom().getDSTSavings();
                                if (beforeSav != 0) {
                                    break;
                                }
                            }
                            // Search for DST rule after the time
                            while (true) {
                                afterTrs = btz.getNextTransition(afterT, false);
                                if (afterTrs == null) {
                                    break;
                                }
                                afterT = afterTrs.getTime();
                                afterSav = afterTrs.getTo().getDSTSavings();
                                if (afterSav != 0) {
                                    break;
                                }
                            }
                            if (beforeTrs != null && afterTrs != null) {
                                if (time - beforeT > afterT - time) {
                                    resolvedSavings = afterSav;
                                } else {
                                    resolvedSavings = beforeSav;
                                }
                            } else if (beforeTrs != null && beforeSav != 0) {
                                resolvedSavings = beforeSav;
                            } else if (afterTrs != null && afterSav != 0) {
                                resolvedSavings = afterSav;
                            } else {
                                resolvedSavings = btz.getDSTSavings();
                            }
                        } else {
                            resolvedSavings = tz.getDSTSavings();
                        }
                        if (resolvedSavings == 0) {
                            // Final fallback
                            resolvedSavings = millisPerHour;
                        }
                    }
                }
                cal.set(Calendar.ZONE_OFFSET, offsets[0]);
                cal.set(Calendar.DST_OFFSET, resolvedSavings);
            }
        }
    }// if any fields are out of range, e.g., MONTH == 17.
     catch (IllegalArgumentException e) {
        parsePos.setErrorIndex(pos);
        parsePos.setIndex(start);
        if (backupTZ != null) {
            calendar.setTimeZone(backupTZ);
        }
        return;
    }
    // instead of the input calendar
    if (resultCal != null) {
        resultCal.setTimeZone(cal.getTimeZone());
        resultCal.setTimeInMillis(cal.getTimeInMillis());
    }
    // Restore the original time zone if required
    if (backupTZ != null) {
        calendar.setTimeZone(backupTZ);
    }
}

Example 70 with TimeZone

use of android.icu.util.TimeZone in project j2objc by google.

the class TimeZoneGenericNames method formatGenericNonLocationName.

/**
 * Private method to get a generic string, with fallback logics involved,
 * that is,
 *
 * 1. If a generic non-location string is available for the zone, return it.
 * 2. If a generic non-location string is associated with a meta zone and
 *    the zone never use daylight time around the given date, use the standard
 *    string (if available).
 * 3. If a generic non-location string is associated with a meta zone and
 *    the offset at the given time is different from the preferred zone for the
 *    current locale, then return the generic partial location string (if available)
 * 4. If a generic non-location string is not available, use generic location
 *    string.
 *
 * @param tz the requested time zone
 * @param date the date
 * @param type the generic name type, either LONG or SHORT
 * @return the name used for a generic name type, which could be the
 * generic name, or the standard name (if the zone does not observes DST
 * around the date), or the partial location name.
 */
private String formatGenericNonLocationName(TimeZone tz, GenericNameType type, long date) {
    assert (type == GenericNameType.LONG || type == GenericNameType.SHORT);
    String tzID = ZoneMeta.getCanonicalCLDRID(tz);
    if (tzID == null) {
        return null;
    }
    // Try to get a name from time zone first
    NameType nameType = (type == GenericNameType.LONG) ? NameType.LONG_GENERIC : NameType.SHORT_GENERIC;
    String name = _tznames.getTimeZoneDisplayName(tzID, nameType);
    if (name != null) {
        return name;
    }
    // Try meta zone
    String mzID = _tznames.getMetaZoneID(tzID, date);
    if (mzID != null) {
        boolean useStandard = false;
        int[] offsets = { 0, 0 };
        tz.getOffset(date, false, offsets);
        if (offsets[1] == 0) {
            useStandard = true;
            // Check if the zone actually uses daylight saving time around the time
            if (tz instanceof BasicTimeZone) {
                BasicTimeZone btz = (BasicTimeZone) tz;
                TimeZoneTransition before = btz.getPreviousTransition(date, true);
                if (before != null && (date - before.getTime() < DST_CHECK_RANGE) && before.getFrom().getDSTSavings() != 0) {
                    useStandard = false;
                } else {
                    TimeZoneTransition after = btz.getNextTransition(date, false);
                    if (after != null && (after.getTime() - date < DST_CHECK_RANGE) && after.getTo().getDSTSavings() != 0) {
                        useStandard = false;
                    }
                }
            } else {
                // If not BasicTimeZone... only if the instance is not an ICU's implementation.
                // We may get a wrong answer in edge case, but it should practically work OK.
                int[] tmpOffsets = new int[2];
                tz.getOffset(date - DST_CHECK_RANGE, false, tmpOffsets);
                if (tmpOffsets[1] != 0) {
                    useStandard = false;
                } else {
                    tz.getOffset(date + DST_CHECK_RANGE, false, tmpOffsets);
                    if (tmpOffsets[1] != 0) {
                        useStandard = false;
                    }
                }
            }
        }
        if (useStandard) {
            NameType stdNameType = (nameType == NameType.LONG_GENERIC) ? NameType.LONG_STANDARD : NameType.SHORT_STANDARD;
            String stdName = _tznames.getDisplayName(tzID, stdNameType, date);
            if (stdName != null) {
                name = stdName;
                // TODO: revisit this issue later
                // In CLDR, a same display name is used for both generic and standard
                // for some meta zones in some locales.  This looks like a data bugs.
                // For now, we check if the standard name is different from its generic
                // name below.
                String mzGenericName = _tznames.getMetaZoneDisplayName(mzID, nameType);
                if (stdName.equalsIgnoreCase(mzGenericName)) {
                    name = null;
                }
            }
        }
        if (name == null) {
            // Get a name from meta zone
            String mzName = _tznames.getMetaZoneDisplayName(mzID, nameType);
            if (mzName != null) {
                // Check if we need to use a partial location format.
                // This check is done by comparing offset with the meta zone's
                // golden zone at the given date.
                String goldenID = _tznames.getReferenceZoneID(mzID, getTargetRegion());
                if (goldenID != null && !goldenID.equals(tzID)) {
                    TimeZone goldenZone = TimeZone.getFrozenTimeZone(goldenID);
                    int[] offsets1 = { 0, 0 };
                    // Check offset in the golden zone with wall time.
                    // With getOffset(date, false, offsets1),
                    // you may get incorrect results because of time overlap at DST->STD
                    // transition.
                    goldenZone.getOffset(date + offsets[0] + offsets[1], true, offsets1);
                    if (offsets[0] != offsets1[0] || offsets[1] != offsets1[1]) {
                        // Now we need to use a partial location format.
                        name = getPartialLocationName(tzID, mzID, (nameType == NameType.LONG_GENERIC), mzName);
                    } else {
                        name = mzName;
                    }
                } else {
                    name = mzName;
                }
            }
        }
    }
    return name;
}