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Diffstat (limited to 'libjava/classpath/gnu/java/util/ZoneInfo.java')
| -rw-r--r-- | libjava/classpath/gnu/java/util/ZoneInfo.java | 1160 |
1 files changed, 1160 insertions, 0 deletions
diff --git a/libjava/classpath/gnu/java/util/ZoneInfo.java b/libjava/classpath/gnu/java/util/ZoneInfo.java new file mode 100644 index 000000000..117ef3cf2 --- /dev/null +++ b/libjava/classpath/gnu/java/util/ZoneInfo.java @@ -0,0 +1,1160 @@ +/* gnu.java.util.ZoneInfo + Copyright (C) 2007 Free Software Foundation, Inc. + +This file is part of GNU Classpath. + +GNU Classpath is free software; you can redistribute it and/or modify +it under the terms of the GNU General Public License as published by +the Free Software Foundation; either version 2, or (at your option) +any later version. + +GNU Classpath is distributed in the hope that it will be useful, but +WITHOUT ANY WARRANTY; without even the implied warranty of +MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU +General Public License for more details. + +You should have received a copy of the GNU General Public License +along with GNU Classpath; see the file COPYING. If not, write to the +Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA +02110-1301 USA. + +Linking this library statically or dynamically with other modules is +making a combined work based on this library. Thus, the terms and +conditions of the GNU General Public License cover the whole +combination. + +As a special exception, the copyright holders of this library give you +permission to link this library with independent modules to produce an +executable, regardless of the license terms of these independent +modules, and to copy and distribute the resulting executable under +terms of your choice, provided that you also meet, for each linked +independent module, the terms and conditions of the license of that +module. An independent module is a module which is not derived from +or based on this library. If you modify this library, you may extend +this exception to your version of the library, but you are not +obligated to do so. If you do not wish to do so, delete this +exception statement from your version. */ + + +package gnu.java.util; + +import java.io.BufferedInputStream; +import java.io.DataInputStream; +import java.io.EOFException; +import java.io.FileInputStream; +import java.io.InputStream; +import java.io.IOException; +import java.util.Calendar; +import java.util.Date; +import java.util.GregorianCalendar; +import java.util.SimpleTimeZone; +import java.util.TimeZone; + +/** + * This class represents more advanced variant of java.util.SimpleTimeZone. + * It can handle zic(8) compiled transition dates plus uses a SimpleTimeZone + * for years beyond last precomputed transition. Before first precomputed + * transition it assumes no daylight saving was in effect. + * Timezones that never used daylight saving time should use just + * SimpleTimeZone instead of this class. + * + * This object is tightly bound to the Gregorian calendar. It assumes + * a regular seven days week, and the month lengths are that of the + * Gregorian Calendar. + * + * @see Calendar + * @see GregorianCalendar + * @see SimpleTimeZone + * @author Jakub Jelinek + */ +public class ZoneInfo extends TimeZone +{ + private static final int SECS_SHIFT = 22; + private static final long OFFSET_MASK = (1 << 21) - 1; + private static final int OFFSET_SHIFT = 64 - 21; + private static final long IS_DST = 1 << 21; + + /** + * The raw time zone offset in milliseconds to GMT, ignoring + * daylight savings. + * @serial + */ + private int rawOffset; + + /** + * Cached DST savings for the last transition rule. + */ + private int dstSavings; + + /** + * Cached flag whether last transition rule uses DST saving. + */ + private boolean useDaylight; + + /** + * Array of encoded transitions. + * Transition time in UTC seconds since epoch is in the most + * significant 64 - SECS_SHIFT bits, then one bit flag + * whether DST is active and the least significant bits + * containing offset relative to rawOffset. Both the DST + * flag and relative offset apply to time before the transition + * and after or equal to previous transition if any. + * The array must be sorted. + */ + private long[] transitions; + + /** + * SimpleTimeZone rule which applies on or after the latest + * transition. If the DST changes are not expresible as a + * SimpleTimeZone rule, then the rule should just contain + * the standard time and no DST time. + */ + private SimpleTimeZone lastRule; + + /** + * Cached GMT SimpleTimeZone object for internal use in + * getOffset method. + */ + private static SimpleTimeZone gmtZone = null; + + static final long serialVersionUID = -3740626706860383657L; + + /** + * Create a <code>ZoneInfo</code> with the given time offset + * from GMT and with daylight savings. + * + * @param rawOffset The time offset from GMT in milliseconds. + * @param id The identifier of this time zone. + * @param transitions Array of transition times in UTC seconds since + * Epoch in topmost 42 bits, below that 1 boolean bit whether the time + * before that transition used daylight saving and in bottommost 21 + * bits relative daylight saving offset against rawOffset in seconds + * that applies before this transition. + * @param endRule SimpleTimeZone class describing the daylight saving + * rules after the last transition. + */ + public ZoneInfo(int rawOffset, String id, long[] transitions, + SimpleTimeZone lastRule) + { + if (transitions == null || transitions.length < 1) + throw new IllegalArgumentException("transitions must not be null"); + if (lastRule == null) + throw new IllegalArgumentException("lastRule must not be null"); + this.rawOffset = rawOffset; + this.transitions = transitions; + this.lastRule = lastRule; + setID(id); + computeDSTSavings(); + } + + /** + * Gets the time zone offset, for current date, modified in case of + * daylight savings. This is the offset to add to UTC to get the local + * time. + * + * The day must be a positive number and dayOfWeek must be a positive value + * from Calendar. dayOfWeek is redundant, but must match the other values + * or an inaccurate result may be returned. + * + * @param era the era of the given date + * @param year the year of the given date + * @param month the month of the given date, 0 for January. + * @param day the day of month + * @param dayOfWeek the day of week; this must match the other fields. + * @param millis the millis in the day (in local standard time) + * @return the time zone offset in milliseconds. + * @throws IllegalArgumentException if arguments are incorrect. + */ + public int getOffset(int era, int year, int month, int day, int dayOfWeek, + int millis) + { + if (gmtZone == null) + gmtZone = new SimpleTimeZone(0, "GMT"); + + if (dayOfWeek < Calendar.SUNDAY || dayOfWeek > Calendar.SATURDAY) + throw new IllegalArgumentException("dayOfWeek out of range"); + if (month < Calendar.JANUARY || month > Calendar.DECEMBER) + throw new IllegalArgumentException("month out of range:" + month); + + if (era != GregorianCalendar.AD) + return (int) (((transitions[0] << OFFSET_SHIFT) >> OFFSET_SHIFT) * 1000); + + GregorianCalendar cal = new GregorianCalendar((TimeZone) gmtZone); + cal.set(year, month, day, 0, 0, 0); + if (cal.get(Calendar.DAY_OF_MONTH) != day) + throw new IllegalArgumentException("day out of range"); + + return getOffset(cal.getTimeInMillis() - rawOffset + millis); + } + + private long findTransition(long secs) + { + if (secs < (transitions[0] >> SECS_SHIFT)) + return transitions[0]; + + if (secs >= (transitions[transitions.length-1] >> SECS_SHIFT)) + return Long.MAX_VALUE; + + long val = (secs + 1) << SECS_SHIFT; + int lo = 1; + int hi = transitions.length; + int mid = 1; + while (lo < hi) + { + mid = (lo + hi) / 2; + // secs < (transitions[mid-1] >> SECS_SHIFT) + if (val <= transitions[mid-1]) + hi = mid; + // secs >= (transitions[mid] >> SECS_SHIFT) + else if (val > transitions[mid]) + lo = mid + 1; + else + break; + } + return transitions[mid]; + } + + /** + * Get the time zone offset for the specified date, modified in case of + * daylight savings. This is the offset to add to UTC to get the local + * time. + * @param date the date represented in millisecends + * since January 1, 1970 00:00:00 GMT. + */ + public int getOffset(long date) + { + long d = (date >= 0 ? date / 1000 : (date + 1) / 1000 - 1); + long transition = findTransition(d); + + // For times on or after last transition use lastRule. + if (transition == Long.MAX_VALUE) + return lastRule.getOffset(date); + + return (int) (((transition << OFFSET_SHIFT) >> OFFSET_SHIFT) * 1000); + } + + /** + * Returns the time zone offset to GMT in milliseconds, ignoring + * day light savings. + * @return the time zone offset. + */ + public int getRawOffset() + { + return rawOffset; + } + + /** + * Sets the standard time zone offset to GMT. + * @param rawOffset The time offset from GMT in milliseconds. + */ + public void setRawOffset(int rawOffset) + { + this.rawOffset = rawOffset; + lastRule.setRawOffset(rawOffset); + } + + private void computeDSTSavings() + { + if (lastRule.useDaylightTime()) + { + dstSavings = lastRule.getDSTSavings(); + useDaylight = true; + } + else + { + dstSavings = 0; + useDaylight = false; + // lastRule might say no DST is in effect simply because + // the DST rules are too complex for SimpleTimeZone, say + // for Asia/Jerusalem. + // Look at the last DST offset if it is newer than current time. + long currentSecs = System.currentTimeMillis() / 1000; + int i; + for (i = transitions.length - 1; + i >= 0 && currentSecs < (transitions[i] >> SECS_SHIFT); + i--) + if ((transitions[i] & IS_DST) != 0) + { + dstSavings = (int) (((transitions[i] << OFFSET_SHIFT) + >> OFFSET_SHIFT) * 1000) + - rawOffset; + useDaylight = true; + break; + } + } + } + + /** + * Gets the daylight savings offset. This is a positive offset in + * milliseconds with respect to standard time. Typically this + * is one hour, but for some time zones this may be half an our. + * @return the daylight savings offset in milliseconds. + */ + public int getDSTSavings() + { + return dstSavings; + } + + /** + * Returns if this time zone uses daylight savings time. + * @return true, if we use daylight savings time, false otherwise. + */ + public boolean useDaylightTime() + { + return useDaylight; + } + + /** + * Determines if the given date is in daylight savings time. + * @return true, if it is in daylight savings time, false otherwise. + */ + public boolean inDaylightTime(Date date) + { + long d = date.getTime(); + d = (d >= 0 ? d / 1000 : (d + 1) / 1000 - 1); + long transition = findTransition(d); + + // For times on or after last transition use lastRule. + if (transition == Long.MAX_VALUE) + return lastRule.inDaylightTime(date); + + return (transition & IS_DST) != 0; + } + + /** + * Generates the hashCode for the SimpleDateFormat object. It is + * the rawOffset, possibly, if useDaylightSavings is true, xored + * with startYear, startMonth, startDayOfWeekInMonth, ..., endTime. + */ + public synchronized int hashCode() + { + int hash = lastRule.hashCode(); + // FIXME - hash transitions? + return hash; + } + + public synchronized boolean equals(Object o) + { + if (! hasSameRules((TimeZone) o)) + return false; + + ZoneInfo zone = (ZoneInfo) o; + return getID().equals(zone.getID()); + } + + /** + * Test if the other time zone uses the same rule and only + * possibly differs in ID. This implementation for this particular + * class will return true if the other object is a ZoneInfo, + * the raw offsets and useDaylight are identical and if useDaylight + * is true, also the start and end datas are identical. + * @return true if this zone uses the same rule. + */ + public boolean hasSameRules(TimeZone o) + { + if (this == o) + return true; + if (! (o instanceof ZoneInfo)) + return false; + ZoneInfo zone = (ZoneInfo) o; + if (zone.hashCode() != hashCode() || rawOffset != zone.rawOffset) + return false; + if (! lastRule.equals(zone.lastRule)) + return false; + // FIXME - compare transitions? + return true; + } + + /** + * Returns a string representation of this ZoneInfo object. + * @return a string representation of this ZoneInfo object. + */ + public String toString() + { + return getClass().getName() + "[" + "id=" + getID() + ",offset=" + + rawOffset + ",transitions=" + transitions.length + + ",useDaylight=" + useDaylight + + (useDaylight ? (",dstSavings=" + dstSavings) : "") + + ",lastRule=" + lastRule.toString() + "]"; + } + + /** + * Reads zic(8) compiled timezone data file from file + * and returns a TimeZone class describing it, either + * SimpleTimeZone or ZoneInfo depending on whether + * it can be described by SimpleTimeZone rule or not. + */ + public static TimeZone readTZFile(String id, String file) + { + DataInputStream dis = null; + try + { + FileInputStream fis = new FileInputStream(file); + BufferedInputStream bis = new BufferedInputStream(fis); + dis = new DataInputStream(bis); + + // Make sure we are reading a tzfile. + byte[] tzif = new byte[5]; + dis.readFully(tzif); + int tzif2 = 4; + if (tzif[0] == 'T' && tzif[1] == 'Z' + && tzif[2] == 'i' && tzif[3] == 'f') + { + if (tzif[4] >= '2') + tzif2 = 8; + // Reserved bytes + skipFully(dis, 16 - 1); + } + else + // Darwin has tzdata files that don't start with the TZif marker + skipFully(dis, 16 - 5); + + int ttisgmtcnt = dis.readInt(); + int ttisstdcnt = dis.readInt(); + int leapcnt = dis.readInt(); + int timecnt = dis.readInt(); + int typecnt = dis.readInt(); + int charcnt = dis.readInt(); + if (tzif2 == 8) + { + skipFully(dis, timecnt * (4 + 1) + typecnt * (4 + 1 + 1) + charcnt + + leapcnt * (4 + 4) + ttisgmtcnt + ttisstdcnt); + + dis.readFully(tzif); + if (tzif[0] != 'T' || tzif[1] != 'Z' || tzif[2] != 'i' + || tzif[3] != 'f' || tzif[4] < '2') + return null; + + // Reserved bytes + skipFully(dis, 16 - 1); + ttisgmtcnt = dis.readInt(); + ttisstdcnt = dis.readInt(); + leapcnt = dis.readInt(); + timecnt = dis.readInt(); + typecnt = dis.readInt(); + charcnt = dis.readInt(); + } + + // Sanity checks + if (typecnt <= 0 || timecnt < 0 || charcnt < 0 + || leapcnt < 0 || ttisgmtcnt < 0 || ttisstdcnt < 0 + || ttisgmtcnt > typecnt || ttisstdcnt > typecnt) + return null; + + // Transition times + long[] times = new long[timecnt]; + for (int i = 0; i < timecnt; i++) + if (tzif2 == 8) + times[i] = dis.readLong(); + else + times[i] = (long) dis.readInt(); + + // Transition types + int[] types = new int[timecnt]; + for (int i = 0; i < timecnt; i++) + { + types[i] = dis.readByte(); + if (types[i] < 0) + types[i] += 256; + if (types[i] >= typecnt) + return null; + } + + // Types + int[] offsets = new int[typecnt]; + int[] typeflags = new int[typecnt]; + for (int i = 0; i < typecnt; i++) + { + offsets[i] = dis.readInt(); + if (offsets[i] >= IS_DST / 2 || offsets[i] <= -IS_DST / 2) + return null; + int dst = dis.readByte(); + int abbrind = dis.readByte(); + if (abbrind < 0) + abbrind += 256; + if (abbrind >= charcnt) + return null; + typeflags[i] = (dst != 0 ? (1 << 8) : 0) + abbrind; + } + + // Abbrev names + byte[] names = new byte[charcnt]; + dis.readFully(names); + + // Leap transitions, for now ignore + skipFully(dis, leapcnt * (tzif2 + 4) + ttisstdcnt + ttisgmtcnt); + + // tzIf2 format has optional POSIX TZ env string + String tzstr = null; + if (tzif2 == 8 && dis.readByte() == '\n') + { + tzstr = dis.readLine(); + if (tzstr.length() <= 0) + tzstr = null; + } + + // Get std/dst_offset and dst/non-dst time zone names. + int std_ind = -1; + int dst_ind = -1; + if (timecnt == 0) + std_ind = 0; + else + for (int i = timecnt - 1; i >= 0; i--) + { + if (std_ind == -1 && (typeflags[types[i]] & (1 << 8)) == 0) + std_ind = types[i]; + else if (dst_ind == -1 && (typeflags[types[i]] & (1 << 8)) != 0) + dst_ind = types[i]; + if (dst_ind != -1 && std_ind != -1) + break; + } + + if (std_ind == -1) + return null; + + int j = typeflags[std_ind] & 255; + while (j < charcnt && names[j] != 0) + j++; + String std_zonename = new String(names, typeflags[std_ind] & 255, + j - (typeflags[std_ind] & 255), + "ASCII"); + + String dst_zonename = ""; + if (dst_ind != -1) + { + j = typeflags[dst_ind] & 255; + while (j < charcnt && names[j] != 0) + j++; + dst_zonename = new String(names, typeflags[dst_ind] & 255, + j - (typeflags[dst_ind] & 255), "ASCII"); + } + + // Only use gmt offset when necessary. + // Also special case GMT+/- timezones. + String std_offset_string = ""; + String dst_offset_string = ""; + if (tzstr == null + && (dst_ind != -1 + || (offsets[std_ind] != 0 + && !std_zonename.startsWith("GMT+") + && !std_zonename.startsWith("GMT-")))) + { + std_offset_string = Integer.toString(-offsets[std_ind] / 3600); + int seconds = -offsets[std_ind] % 3600; + if (seconds != 0) + { + if (seconds < 0) + seconds *= -1; + if (seconds < 600) + std_offset_string += ":0" + Integer.toString(seconds / 60); + else + std_offset_string += ":" + Integer.toString(seconds / 60); + seconds = seconds % 60; + if (seconds >= 10) + std_offset_string += ":" + Integer.toString(seconds); + else if (seconds > 0) + std_offset_string += ":0" + Integer.toString(seconds); + } + + if (dst_ind != -1 && offsets[dst_ind] != offsets[std_ind] + 3600) + { + dst_offset_string = Integer.toString(-offsets[dst_ind] / 3600); + seconds = -offsets[dst_ind] % 3600; + if (seconds != 0) + { + if (seconds < 0) + seconds *= -1; + if (seconds < 600) + dst_offset_string + += ":0" + Integer.toString(seconds / 60); + else + dst_offset_string + += ":" + Integer.toString(seconds / 60); + seconds = seconds % 60; + if (seconds >= 10) + dst_offset_string += ":" + Integer.toString(seconds); + else if (seconds > 0) + dst_offset_string += ":0" + Integer.toString(seconds); + } + } + } + + /* + * If no tzIf2 POSIX TZ string is available and the timezone + * uses DST, try to guess the last rule by trying to make + * sense from transitions at 5 years in the future and onwards. + * tzdata actually uses only 3 forms of rules: + * fixed date within a month, e.g. change on April, 5th + * 1st weekday on or after Nth: change on Sun>=15 in April + * last weekday in a month: change on lastSun in April + */ + String[] change_spec = { null, null }; + if (tzstr == null && dst_ind != -1 && timecnt > 10) + { + long nowPlus5y = System.currentTimeMillis() / 1000 + + 5 * 365 * 86400; + int first; + + for (first = timecnt - 1; first >= 0; first--) + if (times[first] < nowPlus5y + || (types[first] != std_ind && types[first] != dst_ind) + || types[first] != types[timecnt - 2 + ((first ^ timecnt) & 1)]) + break; + first++; + + if (timecnt - first >= 10 && types[timecnt - 1] != types[timecnt - 2]) + { + GregorianCalendar cal + = new GregorianCalendar(new SimpleTimeZone(0, "GMT")); + + int[] values = new int[2 * 11]; + int i; + for (i = timecnt - 1; i >= first; i--) + { + int base = (i % 2) * 11; + int offset = offsets[types[i > first ? i - 1 : i + 1]]; + cal.setTimeInMillis((times[i] + offset) * 1000); + if (i >= timecnt - 2) + { + values[base + 0] = cal.get(Calendar.YEAR); + values[base + 1] = cal.get(Calendar.MONTH); + values[base + 2] = cal.get(Calendar.DAY_OF_MONTH); + values[base + 3] + = cal.getActualMaximum(Calendar.DAY_OF_MONTH); + values[base + 4] = cal.get(Calendar.DAY_OF_WEEK); + values[base + 5] = cal.get(Calendar.HOUR_OF_DAY); + values[base + 6] = cal.get(Calendar.MINUTE); + values[base + 7] = cal.get(Calendar.SECOND); + values[base + 8] = values[base + 2]; // Range start + values[base + 9] = values[base + 2]; // Range end + values[base + 10] = 0; // Determined type + } + else + { + int year = cal.get(Calendar.YEAR); + int month = cal.get(Calendar.MONTH); + int day_of_month = cal.get(Calendar.DAY_OF_MONTH); + int month_days + = cal.getActualMaximum(Calendar.DAY_OF_MONTH); + int day_of_week = cal.get(Calendar.DAY_OF_WEEK); + int hour = cal.get(Calendar.HOUR_OF_DAY); + int minute = cal.get(Calendar.MINUTE); + int second = cal.get(Calendar.SECOND); + if (year != values[base + 0] - 1 + || month != values[base + 1] + || hour != values[base + 5] + || minute != values[base + 6] + || second != values[base + 7]) + break; + if (day_of_week == values[base + 4]) + { + // Either a Sun>=8 or lastSun rule. + if (day_of_month < values[base + 8]) + values[base + 8] = day_of_month; + if (day_of_month > values[base + 9]) + values[base + 9] = day_of_month; + if (values[base + 10] < 0) + break; + if (values[base + 10] == 0) + { + values[base + 10] = 1; + // If day of month > 28, this is + // certainly lastSun rule. + if (values[base + 2] > 28) + values[base + 2] = 3; + // If day of month isn't in the last + // week, it can't be lastSun rule. + else if (values[base + 2] + <= values[base + 3] - 7) + values[base + 3] = 2; + } + if (values[base + 10] == 1) + { + // If day of month is > 28, this is + // certainly lastSun rule. + if (day_of_month > 28) + values[base + 10] = 3; + // If day of month isn't in the last + // week, it can't be lastSun rule. + else if (day_of_month <= month_days - 7) + values[base + 10] = 2; + } + else if ((values[base + 10] == 2 + && day_of_month > 28) + || (values[base + 10] == 3 + && day_of_month <= month_days - 7)) + break; + } + else + { + // Must be fixed day in month rule. + if (day_of_month != values[base + 2] + || values[base + 10] > 0) + break; + values[base + 4] = day_of_week; + values[base + 10] = -1; + } + values[base + 0] -= 1; + } + } + + if (i < first) + { + for (i = 0; i < 2; i++) + { + int base = 11 * i; + if (values[base + 10] == 0) + continue; + if (values[base + 10] == -1) + { + int[] dayCount + = { 0, 31, 59, 90, 120, 151, + 181, 212, 243, 273, 304, 334 }; + int d = dayCount[values[base + 1] + - Calendar.JANUARY]; + d += values[base + 2]; + change_spec[i] = ",J" + Integer.toString(d); + } + else if (values[base + 10] == 2) + { + // If we haven't seen all days of the week, + // we can't be sure what the rule really is. + if (values[base + 8] + 6 != values[base + 9]) + continue; + + int d; + d = values[base + 1] - Calendar.JANUARY + 1; + // E.g. Sun >= 5 is not representable in POSIX + // TZ env string, use ",Am.n.d" extension + // where m is month 1 .. 12, n is the date on + // or after which it happens and d is day + // of the week, 0 .. 6. So Sun >= 5 in April + // is ",A4.5.0". + if ((values[base + 8] % 7) == 1) + { + change_spec[i] = ",M" + Integer.toString(d); + d = (values[base + 8] + 6) / 7; + } + else + { + change_spec[i] = ",A" + Integer.toString(d); + d = values[base + 8]; + } + change_spec[i] += "." + Integer.toString(d); + d = values[base + 4] - Calendar.SUNDAY; + change_spec[i] += "." + Integer.toString(d); + } + else + { + // If we don't know whether this is lastSun or + // Sun >= 22 rule. That can be either because + // there was insufficient number of + // transitions, or February, where it is quite + // probable we haven't seen any 29th dates. + // For February, assume lastSun rule, otherwise + // punt. + if (values[base + 10] == 1 + && values[base + 1] != Calendar.FEBRUARY) + continue; + + int d; + d = values[base + 1] - Calendar.JANUARY + 1; + change_spec[i] = ",M" + Integer.toString(d); + d = values[base + 4] - Calendar.SUNDAY; + change_spec[i] += ".5." + Integer.toString(d); + } + + // Don't add time specification if time is + // 02:00:00. + if (values[base + 5] != 2 + || values[base + 6] != 0 + || values[base + 7] != 0) + { + int d = values[base + 5]; + change_spec[i] += "/" + Integer.toString(d); + if (values[base + 6] != 0 || values[base + 7] != 0) + { + d = values[base + 6]; + if (d < 10) + change_spec[i] + += ":0" + Integer.toString(d); + else + change_spec[i] += ":" + Integer.toString(d); + d = values[base + 7]; + if (d >= 10) + change_spec[i] + += ":" + Integer.toString(d); + else if (d > 0) + change_spec[i] + += ":0" + Integer.toString(d); + } + } + } + if (types[(timecnt - 1) & -2] == std_ind) + { + String tmp = change_spec[0]; + change_spec[0] = change_spec[1]; + change_spec[1] = tmp; + } + } + } + } + + if (tzstr == null) + { + tzstr = std_zonename + std_offset_string; + if (change_spec[0] != null && change_spec[1] != null) + tzstr += dst_zonename + dst_offset_string + + change_spec[0] + change_spec[1]; + } + + if (timecnt == 0) + return new SimpleTimeZone(offsets[std_ind] * 1000, + id != null ? id : tzstr); + + SimpleTimeZone endRule = createLastRule(tzstr); + if (endRule == null) + return null; + + /* Finally adjust the times array into the form the constructor + * expects. times[0] is special, the offset and DST flag there + * are for all times before that transition. Use the first non-DST + * type. For all other transitions, the data file has the type + * (<offset, isdst, zonename>) for the time interval starting + */ + for (int i = 0; i < typecnt; i++) + if ((typeflags[i] & (1 << 8)) == 0) + { + times[0] = (times[0] << SECS_SHIFT) | (offsets[i] & OFFSET_MASK); + break; + } + + for (int i = 1; i < timecnt; i++) + times[i] = (times[i] << SECS_SHIFT) + | (offsets[types[i - 1]] & OFFSET_MASK) + | ((typeflags[types[i - 1]] & (1 << 8)) != 0 ? IS_DST : 0); + + return new ZoneInfo(offsets[std_ind] * 1000, id != null ? id : tzstr, + times, endRule); + } + catch (IOException ioe) + { + // Parse error, not a proper tzfile. + return null; + } + finally + { + try + { + if (dis != null) + dis.close(); + } + catch(IOException ioe) + { + // Error while close, nothing we can do. + } + } + } + + /** + * Skips the requested number of bytes in the given InputStream. + * Throws EOFException if not enough bytes could be skipped. + * Negative numbers of bytes to skip are ignored. + */ + private static void skipFully(InputStream is, long l) throws IOException + { + while (l > 0) + { + long k = is.skip(l); + if (k <= 0) + throw new EOFException(); + l -= k; + } + } + + /** + * Create a SimpleTimeZone from a POSIX TZ environment string, + * see http://www.opengroup.org/onlinepubs/009695399/basedefs/xbd_chap08.html + * for details. + * It supports also an extension, where Am.n.d rule (m 1 .. 12, n 1 .. 25, d + * 0 .. 6) describes day of week d on or after nth day of month m. + * Say A4.5.0 is Sun>=5 in April. + */ + private static SimpleTimeZone createLastRule(String tzstr) + { + String stdName = null; + int stdOffs; + int dstOffs; + try + { + int idLength = tzstr.length(); + + int index = 0; + int prevIndex; + char c; + + // get std + do + c = tzstr.charAt(index); + while (c != '+' && c != '-' && c != ',' && c != ':' + && ! Character.isDigit(c) && c != '\0' && ++index < idLength); + + if (index >= idLength) + return new SimpleTimeZone(0, tzstr); + + stdName = tzstr.substring(0, index); + prevIndex = index; + + // get the std offset + do + c = tzstr.charAt(index++); + while ((c == '-' || c == '+' || c == ':' || Character.isDigit(c)) + && index < idLength); + if (index < idLength) + index--; + + { // convert the dst string to a millis number + String offset = tzstr.substring(prevIndex, index); + prevIndex = index; + + if (offset.charAt(0) == '+' || offset.charAt(0) == '-') + stdOffs = parseTime(offset.substring(1)); + else + stdOffs = parseTime(offset); + + if (offset.charAt(0) == '-') + stdOffs = -stdOffs; + + // TZ timezone offsets are positive when WEST of the meridian. + stdOffs = -stdOffs; + } + + // Done yet? (Format: std offset) + if (index >= idLength) + return new SimpleTimeZone(stdOffs, stdName); + + // get dst + do + c = tzstr.charAt(index); + while (c != '+' && c != '-' && c != ',' && c != ':' + && ! Character.isDigit(c) && c != '\0' && ++index < idLength); + + // Done yet? (Format: std offset dst) + if (index >= idLength) + return new SimpleTimeZone(stdOffs, stdName); + + // get the dst offset + prevIndex = index; + do + c = tzstr.charAt(index++); + while ((c == '-' || c == '+' || c == ':' || Character.isDigit(c)) + && index < idLength); + if (index < idLength) + index--; + + if (index == prevIndex && (c == ',' || c == ';')) + { + // Missing dst offset defaults to one hour ahead of standard + // time. + dstOffs = stdOffs + 60 * 60 * 1000; + } + else + { // convert the dst string to a millis number + String offset = tzstr.substring(prevIndex, index); + prevIndex = index; + + if (offset.charAt(0) == '+' || offset.charAt(0) == '-') + dstOffs = parseTime(offset.substring(1)); + else + dstOffs = parseTime(offset); + + if (offset.charAt(0) == '-') + dstOffs = -dstOffs; + + // TZ timezone offsets are positive when WEST of the meridian. + dstOffs = -dstOffs; + } + + // Done yet? (Format: std offset dst offset) + if (index >= idLength) + return new SimpleTimeZone(stdOffs, stdName); + + // get the DST rule + if (tzstr.charAt(index) == ',' + || tzstr.charAt(index) == ';') + { + index++; + int offs = index; + while (tzstr.charAt(index) != ',' + && tzstr.charAt(index) != ';') + index++; + String startTime = tzstr.substring(offs, index); + index++; + String endTime = tzstr.substring(index); + + index = startTime.indexOf('/'); + int startMillis; + int endMillis; + String startDate; + String endDate; + if (index != -1) + { + startDate = startTime.substring(0, index); + startMillis = parseTime(startTime.substring(index + 1)); + } + else + { + startDate = startTime; + // if time isn't given, default to 2:00:00 AM. + startMillis = 2 * 60 * 60 * 1000; + } + index = endTime.indexOf('/'); + if (index != -1) + { + endDate = endTime.substring(0, index); + endMillis = parseTime(endTime.substring(index + 1)); + } + else + { + endDate = endTime; + // if time isn't given, default to 2:00:00 AM. + endMillis = 2 * 60 * 60 * 1000; + } + + int[] start = getDateParams(startDate); + int[] end = getDateParams(endDate); + return new SimpleTimeZone(stdOffs, tzstr, start[0], start[1], + start[2], startMillis, end[0], end[1], + end[2], endMillis, (dstOffs - stdOffs)); + } + } + + catch (IndexOutOfBoundsException _) + { + } + catch (NumberFormatException _) + { + } + + return null; + } + + /** + * Parses and returns the params for a POSIX TZ date field, + * in the format int[]{ month, day, dayOfWeek }, following the + * SimpleTimeZone constructor rules. + */ + private static int[] getDateParams(String date) + { + int[] dayCount = { 0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334 }; + int month; + int type = 0; + + if (date.charAt(0) == 'M' || date.charAt(0) == 'm') + type = 1; + else if (date.charAt(0) == 'A' || date.charAt(0) == 'a') + type = 2; + + if (type > 0) + { + int day; + + // Month, week of month, day of week + // "Mm.w.d". d is between 0 (Sunday) and 6. Week w is + // between 1 and 5; Week 1 is the first week in which day d + // occurs and Week 5 specifies the last d day in the month. + // Month m is between 1 and 12. + + // Month, day of month, day of week + // ZoneInfo extension, not in POSIX + // "Am.n.d". d is between 0 (Sunday) and 6. Day of month n is + // between 1 and 25. Month m is between 1 and 12. + + month = Integer.parseInt(date.substring(1, date.indexOf('.'))); + int week = Integer.parseInt(date.substring(date.indexOf('.') + 1, + date.lastIndexOf('.'))); + int dayOfWeek = Integer.parseInt(date.substring(date.lastIndexOf('.') + + 1)); + dayOfWeek++; // Java day of week is one-based, Sunday is first day. + + if (type == 2) + { + day = week; + dayOfWeek = -dayOfWeek; + } + else if (week == 5) + day = -1; // last day of month is -1 in java, 5 in TZ + else + { + // First day of week starting on or after. For example, + // to specify the second Sunday of April, set month to + // APRIL, day-of-month to 8, and day-of-week to -SUNDAY. + day = (week - 1) * 7 + 1; + dayOfWeek = -dayOfWeek; + } + + month--; // Java month is zero-based. + return new int[] { month, day, dayOfWeek }; + } + + // julian day, either zero-based 0<=n<=365 (incl feb 29) + // or one-based 1<=n<=365 (no feb 29) + int julianDay; // Julian day + + if (date.charAt(0) != 'J' || date.charAt(0) != 'j') + { + julianDay = Integer.parseInt(date.substring(1)); + julianDay++; // make 1-based + // Adjust day count to include feb 29. + dayCount = new int[] + { + 0, 31, 60, 91, 121, 152, 182, 213, 244, 274, 305, 335 + }; + } + else + // 1-based julian day + julianDay = Integer.parseInt(date); + + int i = 11; + while (i > 0) + if (dayCount[i] < julianDay) + break; + else + i--; + julianDay -= dayCount[i]; + month = i; + return new int[] { month, julianDay, 0 }; + } + + /** + * Parses a time field hh[:mm[:ss]], returning the result + * in milliseconds. No leading sign. + */ + private static int parseTime(String time) + { + int millis = 0; + int i = 0; + + while (i < time.length()) + if (time.charAt(i) == ':') + break; + else + i++; + millis = 60 * 60 * 1000 * Integer.parseInt(time.substring(0, i)); + if (i >= time.length()) + return millis; + + int iprev = ++i; + while (i < time.length()) + if (time.charAt(i) == ':') + break; + else + i++; + millis += 60 * 1000 * Integer.parseInt(time.substring(iprev, i)); + if (i >= time.length()) + return millis; + + millis += 1000 * Integer.parseInt(time.substring(++i)); + return millis; + } +} |