| 1 | /* |
| 2 | * Copyright 2001-2005 Stephen Colebourne |
| 3 | * |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License. |
| 15 | */ |
| 16 | package org.joda.time.tz; |
| 17 | |
| 18 | import java.io.DataInput; |
| 19 | import java.io.DataInputStream; |
| 20 | import java.io.DataOutput; |
| 21 | import java.io.DataOutputStream; |
| 22 | import java.io.IOException; |
| 23 | import java.io.InputStream; |
| 24 | import java.io.OutputStream; |
| 25 | import java.text.DateFormatSymbols; |
| 26 | import java.util.ArrayList; |
| 27 | import java.util.Arrays; |
| 28 | import java.util.HashSet; |
| 29 | import java.util.Iterator; |
| 30 | import java.util.Locale; |
| 31 | import java.util.Set; |
| 32 | |
| 33 | import org.joda.time.Chronology; |
| 34 | import org.joda.time.DateTime; |
| 35 | import org.joda.time.DateTimeUtils; |
| 36 | import org.joda.time.DateTimeZone; |
| 37 | import org.joda.time.Period; |
| 38 | import org.joda.time.PeriodType; |
| 39 | import org.joda.time.chrono.ISOChronology; |
| 40 | |
| 41 | /** |
| 42 | * DateTimeZoneBuilder allows complex DateTimeZones to be constructed. Since |
| 43 | * creating a new DateTimeZone this way is a relatively expensive operation, |
| 44 | * built zones can be written to a file. Reading back the encoded data is a |
| 45 | * quick operation. |
| 46 | * <p> |
| 47 | * DateTimeZoneBuilder itself is mutable and not thread-safe, but the |
| 48 | * DateTimeZone objects that it builds are thread-safe and immutable. |
| 49 | * <p> |
| 50 | * It is intended that {@link ZoneInfoCompiler} be used to read time zone data |
| 51 | * files, indirectly calling DateTimeZoneBuilder. The following complex |
| 52 | * example defines the America/Los_Angeles time zone, with all historical |
| 53 | * transitions: |
| 54 | * |
| 55 | * <pre> |
| 56 | * DateTimeZone America_Los_Angeles = new DateTimeZoneBuilder() |
| 57 | * .addCutover(-2147483648, 'w', 1, 1, 0, false, 0) |
| 58 | * .setStandardOffset(-28378000) |
| 59 | * .setFixedSavings("LMT", 0) |
| 60 | * .addCutover(1883, 'w', 11, 18, 0, false, 43200000) |
| 61 | * .setStandardOffset(-28800000) |
| 62 | * .addRecurringSavings("PDT", 3600000, 1918, 1919, 'w', 3, -1, 7, false, 7200000) |
| 63 | * .addRecurringSavings("PST", 0, 1918, 1919, 'w', 10, -1, 7, false, 7200000) |
| 64 | * .addRecurringSavings("PWT", 3600000, 1942, 1942, 'w', 2, 9, 0, false, 7200000) |
| 65 | * .addRecurringSavings("PPT", 3600000, 1945, 1945, 'u', 8, 14, 0, false, 82800000) |
| 66 | * .addRecurringSavings("PST", 0, 1945, 1945, 'w', 9, 30, 0, false, 7200000) |
| 67 | * .addRecurringSavings("PDT", 3600000, 1948, 1948, 'w', 3, 14, 0, false, 7200000) |
| 68 | * .addRecurringSavings("PST", 0, 1949, 1949, 'w', 1, 1, 0, false, 7200000) |
| 69 | * .addRecurringSavings("PDT", 3600000, 1950, 1966, 'w', 4, -1, 7, false, 7200000) |
| 70 | * .addRecurringSavings("PST", 0, 1950, 1961, 'w', 9, -1, 7, false, 7200000) |
| 71 | * .addRecurringSavings("PST", 0, 1962, 1966, 'w', 10, -1, 7, false, 7200000) |
| 72 | * .addRecurringSavings("PST", 0, 1967, 2147483647, 'w', 10, -1, 7, false, 7200000) |
| 73 | * .addRecurringSavings("PDT", 3600000, 1967, 1973, 'w', 4, -1, 7, false, 7200000) |
| 74 | * .addRecurringSavings("PDT", 3600000, 1974, 1974, 'w', 1, 6, 0, false, 7200000) |
| 75 | * .addRecurringSavings("PDT", 3600000, 1975, 1975, 'w', 2, 23, 0, false, 7200000) |
| 76 | * .addRecurringSavings("PDT", 3600000, 1976, 1986, 'w', 4, -1, 7, false, 7200000) |
| 77 | * .addRecurringSavings("PDT", 3600000, 1987, 2147483647, 'w', 4, 1, 7, true, 7200000) |
| 78 | * .toDateTimeZone("America/Los_Angeles"); |
| 79 | * </pre> |
| 80 | * |
| 81 | * @author Brian S O'Neill |
| 82 | * @see ZoneInfoCompiler |
| 83 | * @see ZoneInfoProvider |
| 84 | * @since 1.0 |
| 85 | */ |
| 86 | public class DateTimeZoneBuilder { |
| 87 | /** |
| 88 | * Decodes a built DateTimeZone from the given stream, as encoded by |
| 89 | * writeTo. |
| 90 | * |
| 91 | * @param in input stream to read encoded DateTimeZone from. |
| 92 | * @param id time zone id to assign |
| 93 | */ |
| 94 | public static DateTimeZone readFrom(InputStream in, String id) throws IOException { |
| 95 | if (in instanceof DataInput) { |
| 96 | return readFrom((DataInput)in, id); |
| 97 | } else { |
| 98 | return readFrom((DataInput)new DataInputStream(in), id); |
| 99 | } |
| 100 | } |
| 101 | |
| 102 | /** |
| 103 | * Decodes a built DateTimeZone from the given stream, as encoded by |
| 104 | * writeTo. |
| 105 | * |
| 106 | * @param in input stream to read encoded DateTimeZone from. |
| 107 | * @param id time zone id to assign |
| 108 | */ |
| 109 | public static DateTimeZone readFrom(DataInput in, String id) throws IOException { |
| 110 | switch (in.readUnsignedByte()) { |
| 111 | case 'F': |
| 112 | DateTimeZone fixed = new FixedDateTimeZone |
| 113 | (id, in.readUTF(), (int)readMillis(in), (int)readMillis(in)); |
| 114 | if (fixed.equals(DateTimeZone.UTC)) { |
| 115 | fixed = DateTimeZone.UTC; |
| 116 | } |
| 117 | return fixed; |
| 118 | case 'C': |
| 119 | return CachedDateTimeZone.forZone(PrecalculatedZone.readFrom(in, id)); |
| 120 | case 'P': |
| 121 | return PrecalculatedZone.readFrom(in, id); |
| 122 | default: |
| 123 | throw new IOException("Invalid encoding"); |
| 124 | } |
| 125 | } |
| 126 | |
| 127 | /** |
| 128 | * Millisecond encoding formats: |
| 129 | * |
| 130 | * upper two bits units field length approximate range |
| 131 | * --------------------------------------------------------------- |
| 132 | * 00 30 minutes 1 byte +/- 16 hours |
| 133 | * 01 minutes 4 bytes +/- 1020 years |
| 134 | * 10 seconds 5 bytes +/- 4355 years |
| 135 | * 11 millis 9 bytes +/- 292,000,000 years |
| 136 | * |
| 137 | * Remaining bits in field form signed offset from 1970-01-01T00:00:00Z. |
| 138 | */ |
| 139 | static void writeMillis(DataOutput out, long millis) throws IOException { |
| 140 | if (millis % (30 * 60000L) == 0) { |
| 141 | // Try to write in 30 minute units. |
| 142 | long units = millis / (30 * 60000L); |
| 143 | if (((units << (64 - 6)) >> (64 - 6)) == units) { |
| 144 | // Form 00 (6 bits effective precision) |
| 145 | out.writeByte((int)(units & 0x3f)); |
| 146 | return; |
| 147 | } |
| 148 | } |
| 149 | |
| 150 | if (millis % 60000L == 0) { |
| 151 | // Try to write minutes. |
| 152 | long minutes = millis / 60000L; |
| 153 | if (((minutes << (64 - 30)) >> (64 - 30)) == minutes) { |
| 154 | // Form 01 (30 bits effective precision) |
| 155 | out.writeInt(0x40000000 | (int)(minutes & 0x3fffffff)); |
| 156 | return; |
| 157 | } |
| 158 | } |
| 159 | |
| 160 | if (millis % 1000L == 0) { |
| 161 | // Try to write seconds. |
| 162 | long seconds = millis / 1000L; |
| 163 | if (((seconds << (64 - 38)) >> (64 - 38)) == seconds) { |
| 164 | // Form 10 (38 bits effective precision) |
| 165 | out.writeByte(0x80 | (int)((seconds >> 32) & 0x3f)); |
| 166 | out.writeInt((int)(seconds & 0xffffffff)); |
| 167 | return; |
| 168 | } |
| 169 | } |
| 170 | |
| 171 | // Write milliseconds either because the additional precision is |
| 172 | // required or the minutes didn't fit in the field. |
| 173 | |
| 174 | // Form 11 (64 bits effective precision, but write as if 70 bits) |
| 175 | out.writeByte(millis < 0 ? 0xff : 0xc0); |
| 176 | out.writeLong(millis); |
| 177 | } |
| 178 | |
| 179 | /** |
| 180 | * Reads encoding generated by writeMillis. |
| 181 | */ |
| 182 | static long readMillis(DataInput in) throws IOException { |
| 183 | int v = in.readUnsignedByte(); |
| 184 | switch (v >> 6) { |
| 185 | case 0: default: |
| 186 | // Form 00 (6 bits effective precision) |
| 187 | v = (v << (32 - 6)) >> (32 - 6); |
| 188 | return v * (30 * 60000L); |
| 189 | |
| 190 | case 1: |
| 191 | // Form 01 (30 bits effective precision) |
| 192 | v = (v << (32 - 6)) >> (32 - 30); |
| 193 | v |= (in.readUnsignedByte()) << 16; |
| 194 | v |= (in.readUnsignedByte()) << 8; |
| 195 | v |= (in.readUnsignedByte()); |
| 196 | return v * 60000L; |
| 197 | |
| 198 | case 2: |
| 199 | // Form 10 (38 bits effective precision) |
| 200 | long w = (((long)v) << (64 - 6)) >> (64 - 38); |
| 201 | w |= (in.readUnsignedByte()) << 24; |
| 202 | w |= (in.readUnsignedByte()) << 16; |
| 203 | w |= (in.readUnsignedByte()) << 8; |
| 204 | w |= (in.readUnsignedByte()); |
| 205 | return w * 1000L; |
| 206 | |
| 207 | case 3: |
| 208 | // Form 11 (64 bits effective precision) |
| 209 | return in.readLong(); |
| 210 | } |
| 211 | } |
| 212 | |
| 213 | private static DateTimeZone buildFixedZone(String id, String nameKey, |
| 214 | int wallOffset, int standardOffset) { |
| 215 | if ("UTC".equals(id) && id.equals(nameKey) && |
| 216 | wallOffset == 0 && standardOffset == 0) { |
| 217 | return DateTimeZone.UTC; |
| 218 | } |
| 219 | return new FixedDateTimeZone(id, nameKey, wallOffset, standardOffset); |
| 220 | } |
| 221 | |
| 222 | // List of RuleSets. |
| 223 | private final ArrayList iRuleSets; |
| 224 | |
| 225 | public DateTimeZoneBuilder() { |
| 226 | iRuleSets = new ArrayList(10); |
| 227 | } |
| 228 | |
| 229 | /** |
| 230 | * Adds a cutover for added rules. The standard offset at the cutover |
| 231 | * defaults to 0. Call setStandardOffset afterwards to change it. |
| 232 | * |
| 233 | * @param year year of cutover |
| 234 | * @param mode 'u' - cutover is measured against UTC, 'w' - against wall |
| 235 | * offset, 's' - against standard offset. |
| 236 | * @param dayOfMonth if negative, set to ((last day of month) - ~dayOfMonth). |
| 237 | * For example, if -1, set to last day of month |
| 238 | * @param dayOfWeek if 0, ignore |
| 239 | * @param advanceDayOfWeek if dayOfMonth does not fall on dayOfWeek, advance to |
| 240 | * dayOfWeek when true, retreat when false. |
| 241 | * @param millisOfDay additional precision for specifying time of day of |
| 242 | * cutover |
| 243 | */ |
| 244 | public DateTimeZoneBuilder addCutover(int year, |
| 245 | char mode, |
| 246 | int monthOfYear, |
| 247 | int dayOfMonth, |
| 248 | int dayOfWeek, |
| 249 | boolean advanceDayOfWeek, |
| 250 | int millisOfDay) |
| 251 | { |
| 252 | OfYear ofYear = new OfYear |
| 253 | (mode, monthOfYear, dayOfMonth, dayOfWeek, advanceDayOfWeek, millisOfDay); |
| 254 | if (iRuleSets.size() > 0) { |
| 255 | RuleSet lastRuleSet = (RuleSet)iRuleSets.get(iRuleSets.size() - 1); |
| 256 | lastRuleSet.setUpperLimit(year, ofYear); |
| 257 | } |
| 258 | iRuleSets.add(new RuleSet()); |
| 259 | return this; |
| 260 | } |
| 261 | |
| 262 | /** |
| 263 | * Sets the standard offset to use for newly added rules until the next |
| 264 | * cutover is added. |
| 265 | */ |
| 266 | public DateTimeZoneBuilder setStandardOffset(int standardOffset) { |
| 267 | getLastRuleSet().setStandardOffset(standardOffset); |
| 268 | return this; |
| 269 | } |
| 270 | |
| 271 | /** |
| 272 | * Set a fixed savings rule at the cutover. |
| 273 | */ |
| 274 | public DateTimeZoneBuilder setFixedSavings(String nameKey, int saveMillis) { |
| 275 | getLastRuleSet().setFixedSavings(nameKey, saveMillis); |
| 276 | return this; |
| 277 | } |
| 278 | |
| 279 | /** |
| 280 | * Add a recurring daylight saving time rule. |
| 281 | * |
| 282 | * @param nameKey name key of new rule |
| 283 | * @param saveMillis milliseconds to add to standard offset |
| 284 | * @param fromYear First year that rule is in effect. MIN_VALUE indicates |
| 285 | * beginning of time. |
| 286 | * @param toYear Last year (inclusive) that rule is in effect. MAX_VALUE |
| 287 | * indicates end of time. |
| 288 | * @param mode 'u' - transitions are calculated against UTC, 'w' - |
| 289 | * transitions are calculated against wall offset, 's' - transitions are |
| 290 | * calculated against standard offset. |
| 291 | * @param dayOfMonth if negative, set to ((last day of month) - ~dayOfMonth). |
| 292 | * For example, if -1, set to last day of month |
| 293 | * @param dayOfWeek if 0, ignore |
| 294 | * @param advanceDayOfWeek if dayOfMonth does not fall on dayOfWeek, advance to |
| 295 | * dayOfWeek when true, retreat when false. |
| 296 | * @param millisOfDay additional precision for specifying time of day of |
| 297 | * transitions |
| 298 | */ |
| 299 | public DateTimeZoneBuilder addRecurringSavings(String nameKey, int saveMillis, |
| 300 | int fromYear, int toYear, |
| 301 | char mode, |
| 302 | int monthOfYear, |
| 303 | int dayOfMonth, |
| 304 | int dayOfWeek, |
| 305 | boolean advanceDayOfWeek, |
| 306 | int millisOfDay) |
| 307 | { |
| 308 | if (fromYear <= toYear) { |
| 309 | OfYear ofYear = new OfYear |
| 310 | (mode, monthOfYear, dayOfMonth, dayOfWeek, advanceDayOfWeek, millisOfDay); |
| 311 | Recurrence recurrence = new Recurrence(ofYear, nameKey, saveMillis); |
| 312 | Rule rule = new Rule(recurrence, fromYear, toYear); |
| 313 | getLastRuleSet().addRule(rule); |
| 314 | } |
| 315 | return this; |
| 316 | } |
| 317 | |
| 318 | private RuleSet getLastRuleSet() { |
| 319 | if (iRuleSets.size() == 0) { |
| 320 | addCutover(Integer.MIN_VALUE, 'w', 1, 1, 0, false, 0); |
| 321 | } |
| 322 | return (RuleSet)iRuleSets.get(iRuleSets.size() - 1); |
| 323 | } |
| 324 | |
| 325 | /** |
| 326 | * Processes all the rules and builds a DateTimeZone. |
| 327 | * |
| 328 | * @param id time zone id to assign |
| 329 | * @param outputID true if the zone id should be output |
| 330 | */ |
| 331 | public DateTimeZone toDateTimeZone(String id, boolean outputID) { |
| 332 | if (id == null) { |
| 333 | throw new IllegalArgumentException(); |
| 334 | } |
| 335 | |
| 336 | // Discover where all the transitions occur and store the results in |
| 337 | // these lists. |
| 338 | ArrayList transitions = new ArrayList(); |
| 339 | |
| 340 | // Tail zone picks up remaining transitions in the form of an endless |
| 341 | // DST cycle. |
| 342 | DSTZone tailZone = null; |
| 343 | |
| 344 | long millis = Long.MIN_VALUE; |
| 345 | int saveMillis = 0; |
| 346 | |
| 347 | int ruleSetCount = iRuleSets.size(); |
| 348 | for (int i=0; i<ruleSetCount; i++) { |
| 349 | RuleSet rs = (RuleSet)iRuleSets.get(i); |
| 350 | Transition next = rs.firstTransition(millis); |
| 351 | if (next == null) { |
| 352 | continue; |
| 353 | } |
| 354 | addTransition(transitions, next); |
| 355 | millis = next.getMillis(); |
| 356 | saveMillis = next.getSaveMillis(); |
| 357 | |
| 358 | // Copy it since we're going to destroy it. |
| 359 | rs = new RuleSet(rs); |
| 360 | |
| 361 | while ((next = rs.nextTransition(millis, saveMillis)) != null) { |
| 362 | if (addTransition(transitions, next)) { |
| 363 | if (tailZone != null) { |
| 364 | // Got the extra transition before DSTZone. |
| 365 | break; |
| 366 | } |
| 367 | } |
| 368 | millis = next.getMillis(); |
| 369 | saveMillis = next.getSaveMillis(); |
| 370 | if (tailZone == null && i == ruleSetCount - 1) { |
| 371 | tailZone = rs.buildTailZone(id); |
| 372 | // If tailZone is not null, don't break out of main loop until |
| 373 | // at least one more transition is calculated. This ensures a |
| 374 | // correct 'seam' to the DSTZone. |
| 375 | } |
| 376 | } |
| 377 | |
| 378 | millis = rs.getUpperLimit(saveMillis); |
| 379 | } |
| 380 | |
| 381 | // Check if a simpler zone implementation can be returned. |
| 382 | if (transitions.size() == 0) { |
| 383 | if (tailZone != null) { |
| 384 | // This shouldn't happen, but handle just in case. |
| 385 | return tailZone; |
| 386 | } |
| 387 | return buildFixedZone(id, "UTC", 0, 0); |
| 388 | } |
| 389 | if (transitions.size() == 1 && tailZone == null) { |
| 390 | Transition tr = (Transition)transitions.get(0); |
| 391 | return buildFixedZone(id, tr.getNameKey(), |
| 392 | tr.getWallOffset(), tr.getStandardOffset()); |
| 393 | } |
| 394 | |
| 395 | PrecalculatedZone zone = PrecalculatedZone.create(id, outputID, transitions, tailZone); |
| 396 | if (zone.isCachable()) { |
| 397 | return CachedDateTimeZone.forZone(zone); |
| 398 | } |
| 399 | return zone; |
| 400 | } |
| 401 | |
| 402 | private boolean addTransition(ArrayList transitions, Transition tr) { |
| 403 | int size = transitions.size(); |
| 404 | if (size == 0) { |
| 405 | transitions.add(tr); |
| 406 | return true; |
| 407 | } |
| 408 | |
| 409 | Transition last = (Transition)transitions.get(size - 1); |
| 410 | if (!tr.isTransitionFrom(last)) { |
| 411 | return false; |
| 412 | } |
| 413 | |
| 414 | // If local time of new transition is same as last local time, just |
| 415 | // replace last transition with new one. |
| 416 | int offsetForLast = 0; |
| 417 | if (size >= 2) { |
| 418 | offsetForLast = ((Transition)transitions.get(size - 2)).getWallOffset(); |
| 419 | } |
| 420 | int offsetForNew = last.getWallOffset(); |
| 421 | |
| 422 | long lastLocal = last.getMillis() + offsetForLast; |
| 423 | long newLocal = tr.getMillis() + offsetForNew; |
| 424 | |
| 425 | if (newLocal != lastLocal) { |
| 426 | transitions.add(tr); |
| 427 | return true; |
| 428 | } |
| 429 | |
| 430 | transitions.remove(size - 1); |
| 431 | return addTransition(transitions, tr); |
| 432 | } |
| 433 | |
| 434 | /** |
| 435 | * Encodes a built DateTimeZone to the given stream. Call readFrom to |
| 436 | * decode the data into a DateTimeZone object. |
| 437 | * |
| 438 | * @param out output stream to receive encoded DateTimeZone. |
| 439 | * @since 1.5 (parameter added) |
| 440 | */ |
| 441 | public void writeTo(String zoneID, OutputStream out) throws IOException { |
| 442 | if (out instanceof DataOutput) { |
| 443 | writeTo(zoneID, (DataOutput)out); |
| 444 | } else { |
| 445 | writeTo(zoneID, (DataOutput)new DataOutputStream(out)); |
| 446 | } |
| 447 | } |
| 448 | |
| 449 | /** |
| 450 | * Encodes a built DateTimeZone to the given stream. Call readFrom to |
| 451 | * decode the data into a DateTimeZone object. |
| 452 | * |
| 453 | * @param out output stream to receive encoded DateTimeZone. |
| 454 | * @since 1.5 (parameter added) |
| 455 | */ |
| 456 | public void writeTo(String zoneID, DataOutput out) throws IOException { |
| 457 | // pass false so zone id is not written out |
| 458 | DateTimeZone zone = toDateTimeZone(zoneID, false); |
| 459 | |
| 460 | if (zone instanceof FixedDateTimeZone) { |
| 461 | out.writeByte('F'); // 'F' for fixed |
| 462 | out.writeUTF(zone.getNameKey(0)); |
| 463 | writeMillis(out, zone.getOffset(0)); |
| 464 | writeMillis(out, zone.getStandardOffset(0)); |
| 465 | } else { |
| 466 | if (zone instanceof CachedDateTimeZone) { |
| 467 | out.writeByte('C'); // 'C' for cached, precalculated |
| 468 | zone = ((CachedDateTimeZone)zone).getUncachedZone(); |
| 469 | } else { |
| 470 | out.writeByte('P'); // 'P' for precalculated, uncached |
| 471 | } |
| 472 | ((PrecalculatedZone)zone).writeTo(out); |
| 473 | } |
| 474 | } |
| 475 | |
| 476 | /** |
| 477 | * Supports setting fields of year and moving between transitions. |
| 478 | */ |
| 479 | private static final class OfYear { |
| 480 | static OfYear readFrom(DataInput in) throws IOException { |
| 481 | return new OfYear((char)in.readUnsignedByte(), |
| 482 | (int)in.readUnsignedByte(), |
| 483 | (int)in.readByte(), |
| 484 | (int)in.readUnsignedByte(), |
| 485 | in.readBoolean(), |
| 486 | (int)readMillis(in)); |
| 487 | } |
| 488 | |
| 489 | // Is 'u', 'w', or 's'. |
| 490 | final char iMode; |
| 491 | |
| 492 | final int iMonthOfYear; |
| 493 | final int iDayOfMonth; |
| 494 | final int iDayOfWeek; |
| 495 | final boolean iAdvance; |
| 496 | final int iMillisOfDay; |
| 497 | |
| 498 | OfYear(char mode, |
| 499 | int monthOfYear, |
| 500 | int dayOfMonth, |
| 501 | int dayOfWeek, boolean advanceDayOfWeek, |
| 502 | int millisOfDay) |
| 503 | { |
| 504 | if (mode != 'u' && mode != 'w' && mode != 's') { |
| 505 | throw new IllegalArgumentException("Unknown mode: " + mode); |
| 506 | } |
| 507 | |
| 508 | iMode = mode; |
| 509 | iMonthOfYear = monthOfYear; |
| 510 | iDayOfMonth = dayOfMonth; |
| 511 | iDayOfWeek = dayOfWeek; |
| 512 | iAdvance = advanceDayOfWeek; |
| 513 | iMillisOfDay = millisOfDay; |
| 514 | } |
| 515 | |
| 516 | /** |
| 517 | * @param standardOffset standard offset just before instant |
| 518 | */ |
| 519 | public long setInstant(int year, int standardOffset, int saveMillis) { |
| 520 | int offset; |
| 521 | if (iMode == 'w') { |
| 522 | offset = standardOffset + saveMillis; |
| 523 | } else if (iMode == 's') { |
| 524 | offset = standardOffset; |
| 525 | } else { |
| 526 | offset = 0; |
| 527 | } |
| 528 | |
| 529 | Chronology chrono = ISOChronology.getInstanceUTC(); |
| 530 | long millis = chrono.year().set(0, year); |
| 531 | millis = chrono.monthOfYear().set(millis, iMonthOfYear); |
| 532 | millis = chrono.millisOfDay().set(millis, iMillisOfDay); |
| 533 | millis = setDayOfMonth(chrono, millis); |
| 534 | |
| 535 | if (iDayOfWeek != 0) { |
| 536 | millis = setDayOfWeek(chrono, millis); |
| 537 | } |
| 538 | |
| 539 | // Convert from local time to UTC. |
| 540 | return millis - offset; |
| 541 | } |
| 542 | |
| 543 | /** |
| 544 | * @param standardOffset standard offset just before next recurrence |
| 545 | */ |
| 546 | public long next(long instant, int standardOffset, int saveMillis) { |
| 547 | int offset; |
| 548 | if (iMode == 'w') { |
| 549 | offset = standardOffset + saveMillis; |
| 550 | } else if (iMode == 's') { |
| 551 | offset = standardOffset; |
| 552 | } else { |
| 553 | offset = 0; |
| 554 | } |
| 555 | |
| 556 | // Convert from UTC to local time. |
| 557 | instant += offset; |
| 558 | |
| 559 | Chronology chrono = ISOChronology.getInstanceUTC(); |
| 560 | long next = chrono.monthOfYear().set(instant, iMonthOfYear); |
| 561 | // Be lenient with millisOfDay. |
| 562 | next = chrono.millisOfDay().set(next, 0); |
| 563 | next = chrono.millisOfDay().add(next, iMillisOfDay); |
| 564 | next = setDayOfMonthNext(chrono, next); |
| 565 | |
| 566 | if (iDayOfWeek == 0) { |
| 567 | if (next <= instant) { |
| 568 | next = chrono.year().add(next, 1); |
| 569 | next = setDayOfMonthNext(chrono, next); |
| 570 | } |
| 571 | } else { |
| 572 | next = setDayOfWeek(chrono, next); |
| 573 | if (next <= instant) { |
| 574 | next = chrono.year().add(next, 1); |
| 575 | next = chrono.monthOfYear().set(next, iMonthOfYear); |
| 576 | next = setDayOfMonthNext(chrono, next); |
| 577 | next = setDayOfWeek(chrono, next); |
| 578 | } |
| 579 | } |
| 580 | |
| 581 | // Convert from local time to UTC. |
| 582 | return next - offset; |
| 583 | } |
| 584 | |
| 585 | /** |
| 586 | * @param standardOffset standard offset just before previous recurrence |
| 587 | */ |
| 588 | public long previous(long instant, int standardOffset, int saveMillis) { |
| 589 | int offset; |
| 590 | if (iMode == 'w') { |
| 591 | offset = standardOffset + saveMillis; |
| 592 | } else if (iMode == 's') { |
| 593 | offset = standardOffset; |
| 594 | } else { |
| 595 | offset = 0; |
| 596 | } |
| 597 | |
| 598 | // Convert from UTC to local time. |
| 599 | instant += offset; |
| 600 | |
| 601 | Chronology chrono = ISOChronology.getInstanceUTC(); |
| 602 | long prev = chrono.monthOfYear().set(instant, iMonthOfYear); |
| 603 | // Be lenient with millisOfDay. |
| 604 | prev = chrono.millisOfDay().set(prev, 0); |
| 605 | prev = chrono.millisOfDay().add(prev, iMillisOfDay); |
| 606 | prev = setDayOfMonthPrevious(chrono, prev); |
| 607 | |
| 608 | if (iDayOfWeek == 0) { |
| 609 | if (prev >= instant) { |
| 610 | prev = chrono.year().add(prev, -1); |
| 611 | prev = setDayOfMonthPrevious(chrono, prev); |
| 612 | } |
| 613 | } else { |
| 614 | prev = setDayOfWeek(chrono, prev); |
| 615 | if (prev >= instant) { |
| 616 | prev = chrono.year().add(prev, -1); |
| 617 | prev = chrono.monthOfYear().set(prev, iMonthOfYear); |
| 618 | prev = setDayOfMonthPrevious(chrono, prev); |
| 619 | prev = setDayOfWeek(chrono, prev); |
| 620 | } |
| 621 | } |
| 622 | |
| 623 | // Convert from local time to UTC. |
| 624 | return prev - offset; |
| 625 | } |
| 626 | |
| 627 | public boolean equals(Object obj) { |
| 628 | if (this == obj) { |
| 629 | return true; |
| 630 | } |
| 631 | if (obj instanceof OfYear) { |
| 632 | OfYear other = (OfYear)obj; |
| 633 | return |
| 634 | iMode == other.iMode && |
| 635 | iMonthOfYear == other.iMonthOfYear && |
| 636 | iDayOfMonth == other.iDayOfMonth && |
| 637 | iDayOfWeek == other.iDayOfWeek && |
| 638 | iAdvance == other.iAdvance && |
| 639 | iMillisOfDay == other.iMillisOfDay; |
| 640 | } |
| 641 | return false; |
| 642 | } |
| 643 | |
| 644 | /* |
| 645 | public String toString() { |
| 646 | return |
| 647 | "[OfYear]\n" + |
| 648 | "Mode: " + iMode + '\n' + |
| 649 | "MonthOfYear: " + iMonthOfYear + '\n' + |
| 650 | "DayOfMonth: " + iDayOfMonth + '\n' + |
| 651 | "DayOfWeek: " + iDayOfWeek + '\n' + |
| 652 | "AdvanceDayOfWeek: " + iAdvance + '\n' + |
| 653 | "MillisOfDay: " + iMillisOfDay + '\n'; |
| 654 | } |
| 655 | */ |
| 656 | |
| 657 | public void writeTo(DataOutput out) throws IOException { |
| 658 | out.writeByte(iMode); |
| 659 | out.writeByte(iMonthOfYear); |
| 660 | out.writeByte(iDayOfMonth); |
| 661 | out.writeByte(iDayOfWeek); |
| 662 | out.writeBoolean(iAdvance); |
| 663 | writeMillis(out, iMillisOfDay); |
| 664 | } |
| 665 | |
| 666 | /** |
| 667 | * If month-day is 02-29 and year isn't leap, advances to next leap year. |
| 668 | */ |
| 669 | private long setDayOfMonthNext(Chronology chrono, long next) { |
| 670 | try { |
| 671 | next = setDayOfMonth(chrono, next); |
| 672 | } catch (IllegalArgumentException e) { |
| 673 | if (iMonthOfYear == 2 && iDayOfMonth == 29) { |
| 674 | while (chrono.year().isLeap(next) == false) { |
| 675 | next = chrono.year().add(next, 1); |
| 676 | } |
| 677 | next = setDayOfMonth(chrono, next); |
| 678 | } else { |
| 679 | throw e; |
| 680 | } |
| 681 | } |
| 682 | return next; |
| 683 | } |
| 684 | |
| 685 | /** |
| 686 | * If month-day is 02-29 and year isn't leap, retreats to previous leap year. |
| 687 | */ |
| 688 | private long setDayOfMonthPrevious(Chronology chrono, long prev) { |
| 689 | try { |
| 690 | prev = setDayOfMonth(chrono, prev); |
| 691 | } catch (IllegalArgumentException e) { |
| 692 | if (iMonthOfYear == 2 && iDayOfMonth == 29) { |
| 693 | while (chrono.year().isLeap(prev) == false) { |
| 694 | prev = chrono.year().add(prev, -1); |
| 695 | } |
| 696 | prev = setDayOfMonth(chrono, prev); |
| 697 | } else { |
| 698 | throw e; |
| 699 | } |
| 700 | } |
| 701 | return prev; |
| 702 | } |
| 703 | |
| 704 | private long setDayOfMonth(Chronology chrono, long instant) { |
| 705 | if (iDayOfMonth >= 0) { |
| 706 | instant = chrono.dayOfMonth().set(instant, iDayOfMonth); |
| 707 | } else { |
| 708 | instant = chrono.dayOfMonth().set(instant, 1); |
| 709 | instant = chrono.monthOfYear().add(instant, 1); |
| 710 | instant = chrono.dayOfMonth().add(instant, iDayOfMonth); |
| 711 | } |
| 712 | return instant; |
| 713 | } |
| 714 | |
| 715 | private long setDayOfWeek(Chronology chrono, long instant) { |
| 716 | int dayOfWeek = chrono.dayOfWeek().get(instant); |
| 717 | int daysToAdd = iDayOfWeek - dayOfWeek; |
| 718 | if (daysToAdd != 0) { |
| 719 | if (iAdvance) { |
| 720 | if (daysToAdd < 0) { |
| 721 | daysToAdd += 7; |
| 722 | } |
| 723 | } else { |
| 724 | if (daysToAdd > 0) { |
| 725 | daysToAdd -= 7; |
| 726 | } |
| 727 | } |
| 728 | instant = chrono.dayOfWeek().add(instant, daysToAdd); |
| 729 | } |
| 730 | return instant; |
| 731 | } |
| 732 | } |
| 733 | |
| 734 | /** |
| 735 | * Extends OfYear with a nameKey and savings. |
| 736 | */ |
| 737 | private static final class Recurrence { |
| 738 | static Recurrence readFrom(DataInput in) throws IOException { |
| 739 | return new Recurrence(OfYear.readFrom(in), in.readUTF(), (int)readMillis(in)); |
| 740 | } |
| 741 | |
| 742 | final OfYear iOfYear; |
| 743 | final String iNameKey; |
| 744 | final int iSaveMillis; |
| 745 | |
| 746 | Recurrence(OfYear ofYear, String nameKey, int saveMillis) { |
| 747 | iOfYear = ofYear; |
| 748 | iNameKey = nameKey; |
| 749 | iSaveMillis = saveMillis; |
| 750 | } |
| 751 | |
| 752 | public OfYear getOfYear() { |
| 753 | return iOfYear; |
| 754 | } |
| 755 | |
| 756 | /** |
| 757 | * @param standardOffset standard offset just before next recurrence |
| 758 | */ |
| 759 | public long next(long instant, int standardOffset, int saveMillis) { |
| 760 | return iOfYear.next(instant, standardOffset, saveMillis); |
| 761 | } |
| 762 | |
| 763 | /** |
| 764 | * @param standardOffset standard offset just before previous recurrence |
| 765 | */ |
| 766 | public long previous(long instant, int standardOffset, int saveMillis) { |
| 767 | return iOfYear.previous(instant, standardOffset, saveMillis); |
| 768 | } |
| 769 | |
| 770 | public String getNameKey() { |
| 771 | return iNameKey; |
| 772 | } |
| 773 | |
| 774 | public int getSaveMillis() { |
| 775 | return iSaveMillis; |
| 776 | } |
| 777 | |
| 778 | public boolean equals(Object obj) { |
| 779 | if (this == obj) { |
| 780 | return true; |
| 781 | } |
| 782 | if (obj instanceof Recurrence) { |
| 783 | Recurrence other = (Recurrence)obj; |
| 784 | return |
| 785 | iSaveMillis == other.iSaveMillis && |
| 786 | iNameKey.equals(other.iNameKey) && |
| 787 | iOfYear.equals(other.iOfYear); |
| 788 | } |
| 789 | return false; |
| 790 | } |
| 791 | |
| 792 | public void writeTo(DataOutput out) throws IOException { |
| 793 | iOfYear.writeTo(out); |
| 794 | out.writeUTF(iNameKey); |
| 795 | writeMillis(out, iSaveMillis); |
| 796 | } |
| 797 | |
| 798 | Recurrence rename(String nameKey) { |
| 799 | return new Recurrence(iOfYear, nameKey, iSaveMillis); |
| 800 | } |
| 801 | |
| 802 | Recurrence renameAppend(String appendNameKey) { |
| 803 | return rename((iNameKey + appendNameKey).intern()); |
| 804 | } |
| 805 | } |
| 806 | |
| 807 | /** |
| 808 | * Extends Recurrence with inclusive year limits. |
| 809 | */ |
| 810 | private static final class Rule { |
| 811 | final Recurrence iRecurrence; |
| 812 | final int iFromYear; // inclusive |
| 813 | final int iToYear; // inclusive |
| 814 | |
| 815 | Rule(Recurrence recurrence, int fromYear, int toYear) { |
| 816 | iRecurrence = recurrence; |
| 817 | iFromYear = fromYear; |
| 818 | iToYear = toYear; |
| 819 | } |
| 820 | |
| 821 | public int getFromYear() { |
| 822 | return iFromYear; |
| 823 | } |
| 824 | |
| 825 | public int getToYear() { |
| 826 | return iToYear; |
| 827 | } |
| 828 | |
| 829 | public OfYear getOfYear() { |
| 830 | return iRecurrence.getOfYear(); |
| 831 | } |
| 832 | |
| 833 | public String getNameKey() { |
| 834 | return iRecurrence.getNameKey(); |
| 835 | } |
| 836 | |
| 837 | public int getSaveMillis() { |
| 838 | return iRecurrence.getSaveMillis(); |
| 839 | } |
| 840 | |
| 841 | public long next(final long instant, int standardOffset, int saveMillis) { |
| 842 | Chronology chrono = ISOChronology.getInstanceUTC(); |
| 843 | |
| 844 | final int wallOffset = standardOffset + saveMillis; |
| 845 | long testInstant = instant; |
| 846 | |
| 847 | int year; |
| 848 | if (instant == Long.MIN_VALUE) { |
| 849 | year = Integer.MIN_VALUE; |
| 850 | } else { |
| 851 | year = chrono.year().get(instant + wallOffset); |
| 852 | } |
| 853 | |
| 854 | if (year < iFromYear) { |
| 855 | // First advance instant to start of from year. |
| 856 | testInstant = chrono.year().set(0, iFromYear) - wallOffset; |
| 857 | // Back off one millisecond to account for next recurrence |
| 858 | // being exactly at the beginning of the year. |
| 859 | testInstant -= 1; |
| 860 | } |
| 861 | |
| 862 | long next = iRecurrence.next(testInstant, standardOffset, saveMillis); |
| 863 | |
| 864 | if (next > instant) { |
| 865 | year = chrono.year().get(next + wallOffset); |
| 866 | if (year > iToYear) { |
| 867 | // Out of range, return original value. |
| 868 | next = instant; |
| 869 | } |
| 870 | } |
| 871 | |
| 872 | return next; |
| 873 | } |
| 874 | } |
| 875 | |
| 876 | private static final class Transition { |
| 877 | private final long iMillis; |
| 878 | private final String iNameKey; |
| 879 | private final int iWallOffset; |
| 880 | private final int iStandardOffset; |
| 881 | |
| 882 | Transition(long millis, Transition tr) { |
| 883 | iMillis = millis; |
| 884 | iNameKey = tr.iNameKey; |
| 885 | iWallOffset = tr.iWallOffset; |
| 886 | iStandardOffset = tr.iStandardOffset; |
| 887 | } |
| 888 | |
| 889 | Transition(long millis, Rule rule, int standardOffset) { |
| 890 | iMillis = millis; |
| 891 | iNameKey = rule.getNameKey(); |
| 892 | iWallOffset = standardOffset + rule.getSaveMillis(); |
| 893 | iStandardOffset = standardOffset; |
| 894 | } |
| 895 | |
| 896 | Transition(long millis, String nameKey, |
| 897 | int wallOffset, int standardOffset) { |
| 898 | iMillis = millis; |
| 899 | iNameKey = nameKey; |
| 900 | iWallOffset = wallOffset; |
| 901 | iStandardOffset = standardOffset; |
| 902 | } |
| 903 | |
| 904 | public long getMillis() { |
| 905 | return iMillis; |
| 906 | } |
| 907 | |
| 908 | public String getNameKey() { |
| 909 | return iNameKey; |
| 910 | } |
| 911 | |
| 912 | public int getWallOffset() { |
| 913 | return iWallOffset; |
| 914 | } |
| 915 | |
| 916 | public int getStandardOffset() { |
| 917 | return iStandardOffset; |
| 918 | } |
| 919 | |
| 920 | public int getSaveMillis() { |
| 921 | return iWallOffset - iStandardOffset; |
| 922 | } |
| 923 | |
| 924 | /** |
| 925 | * There must be a change in the millis, wall offsets or name keys. |
| 926 | */ |
| 927 | public boolean isTransitionFrom(Transition other) { |
| 928 | if (other == null) { |
| 929 | return true; |
| 930 | } |
| 931 | return iMillis > other.iMillis && |
| 932 | (iWallOffset != other.iWallOffset || |
| 933 | //iStandardOffset != other.iStandardOffset || |
| 934 | !(iNameKey.equals(other.iNameKey))); |
| 935 | } |
| 936 | } |
| 937 | |
| 938 | private static final class RuleSet { |
| 939 | private static final int YEAR_LIMIT; |
| 940 | |
| 941 | static { |
| 942 | // Don't pre-calculate more than 100 years into the future. Almost |
| 943 | // all zones will stop pre-calculating far sooner anyhow. Either a |
| 944 | // simple DST cycle is detected or the last rule is a fixed |
| 945 | // offset. If a zone has a fixed offset set more than 100 years |
| 946 | // into the future, then it won't be observed. |
| 947 | long now = DateTimeUtils.currentTimeMillis(); |
| 948 | YEAR_LIMIT = ISOChronology.getInstanceUTC().year().get(now) + 100; |
| 949 | } |
| 950 | |
| 951 | private int iStandardOffset; |
| 952 | private ArrayList iRules; |
| 953 | |
| 954 | // Optional. |
| 955 | private String iInitialNameKey; |
| 956 | private int iInitialSaveMillis; |
| 957 | |
| 958 | // Upper limit is exclusive. |
| 959 | private int iUpperYear; |
| 960 | private OfYear iUpperOfYear; |
| 961 | |
| 962 | RuleSet() { |
| 963 | iRules = new ArrayList(10); |
| 964 | iUpperYear = Integer.MAX_VALUE; |
| 965 | } |
| 966 | |
| 967 | /** |
| 968 | * Copy constructor. |
| 969 | */ |
| 970 | RuleSet(RuleSet rs) { |
| 971 | iStandardOffset = rs.iStandardOffset; |
| 972 | iRules = new ArrayList(rs.iRules); |
| 973 | iInitialNameKey = rs.iInitialNameKey; |
| 974 | iInitialSaveMillis = rs.iInitialSaveMillis; |
| 975 | iUpperYear = rs.iUpperYear; |
| 976 | iUpperOfYear = rs.iUpperOfYear; |
| 977 | } |
| 978 | |
| 979 | public int getStandardOffset() { |
| 980 | return iStandardOffset; |
| 981 | } |
| 982 | |
| 983 | public void setStandardOffset(int standardOffset) { |
| 984 | iStandardOffset = standardOffset; |
| 985 | } |
| 986 | |
| 987 | public void setFixedSavings(String nameKey, int saveMillis) { |
| 988 | iInitialNameKey = nameKey; |
| 989 | iInitialSaveMillis = saveMillis; |
| 990 | } |
| 991 | |
| 992 | public void addRule(Rule rule) { |
| 993 | if (!iRules.contains(rule)) { |
| 994 | iRules.add(rule); |
| 995 | } |
| 996 | } |
| 997 | |
| 998 | public void setUpperLimit(int year, OfYear ofYear) { |
| 999 | iUpperYear = year; |
| 1000 | iUpperOfYear = ofYear; |
| 1001 | } |
| 1002 | |
| 1003 | /** |
| 1004 | * Returns a transition at firstMillis with the first name key and |
| 1005 | * offsets for this rule set. This method may return null. |
| 1006 | * |
| 1007 | * @param firstMillis millis of first transition |
| 1008 | */ |
| 1009 | public Transition firstTransition(final long firstMillis) { |
| 1010 | if (iInitialNameKey != null) { |
| 1011 | // Initial zone info explicitly set, so don't search the rules. |
| 1012 | return new Transition(firstMillis, iInitialNameKey, |
| 1013 | iStandardOffset + iInitialSaveMillis, iStandardOffset); |
| 1014 | } |
| 1015 | |
| 1016 | // Make a copy before we destroy the rules. |
| 1017 | ArrayList copy = new ArrayList(iRules); |
| 1018 | |
| 1019 | // Iterate through all the transitions until firstMillis is |
| 1020 | // reached. Use the name key and savings for whatever rule reaches |
| 1021 | // the limit. |
| 1022 | |
| 1023 | long millis = Long.MIN_VALUE; |
| 1024 | int saveMillis = 0; |
| 1025 | Transition first = null; |
| 1026 | |
| 1027 | Transition next; |
| 1028 | while ((next = nextTransition(millis, saveMillis)) != null) { |
| 1029 | millis = next.getMillis(); |
| 1030 | |
| 1031 | if (millis == firstMillis) { |
| 1032 | first = new Transition(firstMillis, next); |
| 1033 | break; |
| 1034 | } |
| 1035 | |
| 1036 | if (millis > firstMillis) { |
| 1037 | if (first == null) { |
| 1038 | // Find first rule without savings. This way a more |
| 1039 | // accurate nameKey is found even though no rule |
| 1040 | // extends to the RuleSet's lower limit. |
| 1041 | Iterator it = copy.iterator(); |
| 1042 | while (it.hasNext()) { |
| 1043 | Rule rule = (Rule)it.next(); |
| 1044 | if (rule.getSaveMillis() == 0) { |
| 1045 | first = new Transition(firstMillis, rule, iStandardOffset); |
| 1046 | break; |
| 1047 | } |
| 1048 | } |
| 1049 | } |
| 1050 | if (first == null) { |
| 1051 | // Found no rule without savings. Create a transition |
| 1052 | // with no savings anyhow, and use the best available |
| 1053 | // name key. |
| 1054 | first = new Transition(firstMillis, next.getNameKey(), |
| 1055 | iStandardOffset, iStandardOffset); |
| 1056 | } |
| 1057 | break; |
| 1058 | } |
| 1059 | |
| 1060 | // Set first to the best transition found so far, but next |
| 1061 | // iteration may find something closer to lower limit. |
| 1062 | first = new Transition(firstMillis, next); |
| 1063 | |
| 1064 | saveMillis = next.getSaveMillis(); |
| 1065 | } |
| 1066 | |
| 1067 | iRules = copy; |
| 1068 | return first; |
| 1069 | } |
| 1070 | |
| 1071 | /** |
| 1072 | * Returns null if RuleSet is exhausted or upper limit reached. Calling |
| 1073 | * this method will throw away rules as they each become |
| 1074 | * exhausted. Copy the RuleSet before using it to compute transitions. |
| 1075 | * |
| 1076 | * Returned transition may be a duplicate from previous |
| 1077 | * transition. Caller must call isTransitionFrom to filter out |
| 1078 | * duplicates. |
| 1079 | * |
| 1080 | * @param saveMillis savings before next transition |
| 1081 | */ |
| 1082 | public Transition nextTransition(final long instant, final int saveMillis) { |
| 1083 | Chronology chrono = ISOChronology.getInstanceUTC(); |
| 1084 | |
| 1085 | // Find next matching rule. |
| 1086 | Rule nextRule = null; |
| 1087 | long nextMillis = Long.MAX_VALUE; |
| 1088 | |
| 1089 | Iterator it = iRules.iterator(); |
| 1090 | while (it.hasNext()) { |
| 1091 | Rule rule = (Rule)it.next(); |
| 1092 | long next = rule.next(instant, iStandardOffset, saveMillis); |
| 1093 | if (next <= instant) { |
| 1094 | it.remove(); |
| 1095 | continue; |
| 1096 | } |
| 1097 | // Even if next is same as previous next, choose the rule |
| 1098 | // in order for more recently added rules to override. |
| 1099 | if (next <= nextMillis) { |
| 1100 | // Found a better match. |
| 1101 | nextRule = rule; |
| 1102 | nextMillis = next; |
| 1103 | } |
| 1104 | } |
| 1105 | |
| 1106 | if (nextRule == null) { |
| 1107 | return null; |
| 1108 | } |
| 1109 | |
| 1110 | // Stop precalculating if year reaches some arbitrary limit. |
| 1111 | if (chrono.year().get(nextMillis) >= YEAR_LIMIT) { |
| 1112 | return null; |
| 1113 | } |
| 1114 | |
| 1115 | // Check if upper limit reached or passed. |
| 1116 | if (iUpperYear < Integer.MAX_VALUE) { |
| 1117 | long upperMillis = |
| 1118 | iUpperOfYear.setInstant(iUpperYear, iStandardOffset, saveMillis); |
| 1119 | if (nextMillis >= upperMillis) { |
| 1120 | // At or after upper limit. |
| 1121 | return null; |
| 1122 | } |
| 1123 | } |
| 1124 | |
| 1125 | return new Transition(nextMillis, nextRule, iStandardOffset); |
| 1126 | } |
| 1127 | |
| 1128 | /** |
| 1129 | * @param saveMillis savings before upper limit |
| 1130 | */ |
| 1131 | public long getUpperLimit(int saveMillis) { |
| 1132 | if (iUpperYear == Integer.MAX_VALUE) { |
| 1133 | return Long.MAX_VALUE; |
| 1134 | } |
| 1135 | return iUpperOfYear.setInstant(iUpperYear, iStandardOffset, saveMillis); |
| 1136 | } |
| 1137 | |
| 1138 | /** |
| 1139 | * Returns null if none can be built. |
| 1140 | */ |
| 1141 | public DSTZone buildTailZone(String id) { |
| 1142 | if (iRules.size() == 2) { |
| 1143 | Rule startRule = (Rule)iRules.get(0); |
| 1144 | Rule endRule = (Rule)iRules.get(1); |
| 1145 | if (startRule.getToYear() == Integer.MAX_VALUE && |
| 1146 | endRule.getToYear() == Integer.MAX_VALUE) { |
| 1147 | |
| 1148 | // With exactly two infinitely recurring rules left, a |
| 1149 | // simple DSTZone can be formed. |
| 1150 | |
| 1151 | // The order of rules can come in any order, and it doesn't |
| 1152 | // really matter which rule was chosen the 'start' and |
| 1153 | // which is chosen the 'end'. DSTZone works properly either |
| 1154 | // way. |
| 1155 | return new DSTZone(id, iStandardOffset, |
| 1156 | startRule.iRecurrence, endRule.iRecurrence); |
| 1157 | } |
| 1158 | } |
| 1159 | return null; |
| 1160 | } |
| 1161 | } |
| 1162 | |
| 1163 | private static final class DSTZone extends DateTimeZone { |
| 1164 | private static final long serialVersionUID = 6941492635554961361L; |
| 1165 | |
| 1166 | static DSTZone readFrom(DataInput in, String id) throws IOException { |
| 1167 | return new DSTZone(id, (int)readMillis(in), |
| 1168 | Recurrence.readFrom(in), Recurrence.readFrom(in)); |
| 1169 | } |
| 1170 | |
| 1171 | final int iStandardOffset; |
| 1172 | final Recurrence iStartRecurrence; |
| 1173 | final Recurrence iEndRecurrence; |
| 1174 | |
| 1175 | DSTZone(String id, int standardOffset, |
| 1176 | Recurrence startRecurrence, Recurrence endRecurrence) { |
| 1177 | super(id); |
| 1178 | iStandardOffset = standardOffset; |
| 1179 | iStartRecurrence = startRecurrence; |
| 1180 | iEndRecurrence = endRecurrence; |
| 1181 | } |
| 1182 | |
| 1183 | public String getNameKey(long instant) { |
| 1184 | return findMatchingRecurrence(instant).getNameKey(); |
| 1185 | } |
| 1186 | |
| 1187 | public int getOffset(long instant) { |
| 1188 | return iStandardOffset + findMatchingRecurrence(instant).getSaveMillis(); |
| 1189 | } |
| 1190 | |
| 1191 | public int getStandardOffset(long instant) { |
| 1192 | return iStandardOffset; |
| 1193 | } |
| 1194 | |
| 1195 | public boolean isFixed() { |
| 1196 | return false; |
| 1197 | } |
| 1198 | |
| 1199 | public long nextTransition(long instant) { |
| 1200 | int standardOffset = iStandardOffset; |
| 1201 | Recurrence startRecurrence = iStartRecurrence; |
| 1202 | Recurrence endRecurrence = iEndRecurrence; |
| 1203 | |
| 1204 | long start, end; |
| 1205 | |
| 1206 | try { |
| 1207 | start = startRecurrence.next |
| 1208 | (instant, standardOffset, endRecurrence.getSaveMillis()); |
| 1209 | if (instant > 0 && start < 0) { |
| 1210 | // Overflowed. |
| 1211 | start = instant; |
| 1212 | } |
| 1213 | } catch (IllegalArgumentException e) { |
| 1214 | // Overflowed. |
| 1215 | start = instant; |
| 1216 | } catch (ArithmeticException e) { |
| 1217 | // Overflowed. |
| 1218 | start = instant; |
| 1219 | } |
| 1220 | |
| 1221 | try { |
| 1222 | end = endRecurrence.next |
| 1223 | (instant, standardOffset, startRecurrence.getSaveMillis()); |
| 1224 | if (instant > 0 && end < 0) { |
| 1225 | // Overflowed. |
| 1226 | end = instant; |
| 1227 | } |
| 1228 | } catch (IllegalArgumentException e) { |
| 1229 | // Overflowed. |
| 1230 | end = instant; |
| 1231 | } catch (ArithmeticException e) { |
| 1232 | // Overflowed. |
| 1233 | end = instant; |
| 1234 | } |
| 1235 | |
| 1236 | return (start > end) ? end : start; |
| 1237 | } |
| 1238 | |
| 1239 | public long previousTransition(long instant) { |
| 1240 | // Increment in order to handle the case where instant is exactly at |
| 1241 | // a transition. |
| 1242 | instant++; |
| 1243 | |
| 1244 | int standardOffset = iStandardOffset; |
| 1245 | Recurrence startRecurrence = iStartRecurrence; |
| 1246 | Recurrence endRecurrence = iEndRecurrence; |
| 1247 | |
| 1248 | long start, end; |
| 1249 | |
| 1250 | try { |
| 1251 | start = startRecurrence.previous |
| 1252 | (instant, standardOffset, endRecurrence.getSaveMillis()); |
| 1253 | if (instant < 0 && start > 0) { |
| 1254 | // Overflowed. |
| 1255 | start = instant; |
| 1256 | } |
| 1257 | } catch (IllegalArgumentException e) { |
| 1258 | // Overflowed. |
| 1259 | start = instant; |
| 1260 | } catch (ArithmeticException e) { |
| 1261 | // Overflowed. |
| 1262 | start = instant; |
| 1263 | } |
| 1264 | |
| 1265 | try { |
| 1266 | end = endRecurrence.previous |
| 1267 | (instant, standardOffset, startRecurrence.getSaveMillis()); |
| 1268 | if (instant < 0 && end > 0) { |
| 1269 | // Overflowed. |
| 1270 | end = instant; |
| 1271 | } |
| 1272 | } catch (IllegalArgumentException e) { |
| 1273 | // Overflowed. |
| 1274 | end = instant; |
| 1275 | } catch (ArithmeticException e) { |
| 1276 | // Overflowed. |
| 1277 | end = instant; |
| 1278 | } |
| 1279 | |
| 1280 | return ((start > end) ? start : end) - 1; |
| 1281 | } |
| 1282 | |
| 1283 | public boolean equals(Object obj) { |
| 1284 | if (this == obj) { |
| 1285 | return true; |
| 1286 | } |
| 1287 | if (obj instanceof DSTZone) { |
| 1288 | DSTZone other = (DSTZone)obj; |
| 1289 | return |
| 1290 | getID().equals(other.getID()) && |
| 1291 | iStandardOffset == other.iStandardOffset && |
| 1292 | iStartRecurrence.equals(other.iStartRecurrence) && |
| 1293 | iEndRecurrence.equals(other.iEndRecurrence); |
| 1294 | } |
| 1295 | return false; |
| 1296 | } |
| 1297 | |
| 1298 | public void writeTo(DataOutput out) throws IOException { |
| 1299 | writeMillis(out, iStandardOffset); |
| 1300 | iStartRecurrence.writeTo(out); |
| 1301 | iEndRecurrence.writeTo(out); |
| 1302 | } |
| 1303 | |
| 1304 | private Recurrence findMatchingRecurrence(long instant) { |
| 1305 | int standardOffset = iStandardOffset; |
| 1306 | Recurrence startRecurrence = iStartRecurrence; |
| 1307 | Recurrence endRecurrence = iEndRecurrence; |
| 1308 | |
| 1309 | long start, end; |
| 1310 | |
| 1311 | try { |
| 1312 | start = startRecurrence.next |
| 1313 | (instant, standardOffset, endRecurrence.getSaveMillis()); |
| 1314 | } catch (IllegalArgumentException e) { |
| 1315 | // Overflowed. |
| 1316 | start = instant; |
| 1317 | } catch (ArithmeticException e) { |
| 1318 | // Overflowed. |
| 1319 | start = instant; |
| 1320 | } |
| 1321 | |
| 1322 | try { |
| 1323 | end = endRecurrence.next |
| 1324 | (instant, standardOffset, startRecurrence.getSaveMillis()); |
| 1325 | } catch (IllegalArgumentException e) { |
| 1326 | // Overflowed. |
| 1327 | end = instant; |
| 1328 | } catch (ArithmeticException e) { |
| 1329 | // Overflowed. |
| 1330 | end = instant; |
| 1331 | } |
| 1332 | |
| 1333 | return (start > end) ? startRecurrence : endRecurrence; |
| 1334 | } |
| 1335 | } |
| 1336 | |
| 1337 | private static final class PrecalculatedZone extends DateTimeZone { |
| 1338 | private static final long serialVersionUID = 7811976468055766265L; |
| 1339 | |
| 1340 | static PrecalculatedZone readFrom(DataInput in, String id) throws IOException { |
| 1341 | // Read string pool. |
| 1342 | int poolSize = in.readUnsignedShort(); |
| 1343 | String[] pool = new String[poolSize]; |
| 1344 | for (int i=0; i<poolSize; i++) { |
| 1345 | pool[i] = in.readUTF(); |
| 1346 | } |
| 1347 | |
| 1348 | int size = in.readInt(); |
| 1349 | long[] transitions = new long[size]; |
| 1350 | int[] wallOffsets = new int[size]; |
| 1351 | int[] standardOffsets = new int[size]; |
| 1352 | String[] nameKeys = new String[size]; |
| 1353 | |
| 1354 | for (int i=0; i<size; i++) { |
| 1355 | transitions[i] = readMillis(in); |
| 1356 | wallOffsets[i] = (int)readMillis(in); |
| 1357 | standardOffsets[i] = (int)readMillis(in); |
| 1358 | try { |
| 1359 | int index; |
| 1360 | if (poolSize < 256) { |
| 1361 | index = in.readUnsignedByte(); |
| 1362 | } else { |
| 1363 | index = in.readUnsignedShort(); |
| 1364 | } |
| 1365 | nameKeys[i] = pool[index]; |
| 1366 | } catch (ArrayIndexOutOfBoundsException e) { |
| 1367 | throw new IOException("Invalid encoding"); |
| 1368 | } |
| 1369 | } |
| 1370 | |
| 1371 | DSTZone tailZone = null; |
| 1372 | if (in.readBoolean()) { |
| 1373 | tailZone = DSTZone.readFrom(in, id); |
| 1374 | } |
| 1375 | |
| 1376 | return new PrecalculatedZone |
| 1377 | (id, transitions, wallOffsets, standardOffsets, nameKeys, tailZone); |
| 1378 | } |
| 1379 | |
| 1380 | /** |
| 1381 | * Factory to create instance from builder. |
| 1382 | * |
| 1383 | * @param id the zone id |
| 1384 | * @param outputID true if the zone id should be output |
| 1385 | * @param transitions the list of Transition objects |
| 1386 | * @param tailZone optional zone for getting info beyond precalculated tables |
| 1387 | */ |
| 1388 | static PrecalculatedZone create(String id, boolean outputID, ArrayList transitions, DSTZone tailZone) { |
| 1389 | int size = transitions.size(); |
| 1390 | if (size == 0) { |
| 1391 | throw new IllegalArgumentException(); |
| 1392 | } |
| 1393 | |
| 1394 | long[] trans = new long[size]; |
| 1395 | int[] wallOffsets = new int[size]; |
| 1396 | int[] standardOffsets = new int[size]; |
| 1397 | String[] nameKeys = new String[size]; |
| 1398 | |
| 1399 | Transition last = null; |
| 1400 | for (int i=0; i<size; i++) { |
| 1401 | Transition tr = (Transition)transitions.get(i); |
| 1402 | |
| 1403 | if (!tr.isTransitionFrom(last)) { |
| 1404 | throw new IllegalArgumentException(id); |
| 1405 | } |
| 1406 | |
| 1407 | trans[i] = tr.getMillis(); |
| 1408 | wallOffsets[i] = tr.getWallOffset(); |
| 1409 | standardOffsets[i] = tr.getStandardOffset(); |
| 1410 | nameKeys[i] = tr.getNameKey(); |
| 1411 | |
| 1412 | last = tr; |
| 1413 | } |
| 1414 | |
| 1415 | // Some timezones (Australia) have the same name key for |
| 1416 | // summer and winter which messes everything up. Fix it here. |
| 1417 | String[] zoneNameData = new String[5]; |
| 1418 | String[][] zoneStrings = new DateFormatSymbols(Locale.ENGLISH).getZoneStrings(); |
| 1419 | for (int j = 0; j < zoneStrings.length; j++) { |
| 1420 | String[] set = zoneStrings[j]; |
| 1421 | if (set != null && set.length == 5 && id.equals(set[0])) { |
| 1422 | zoneNameData = set; |
| 1423 | } |
| 1424 | } |
| 1425 | for (int i = 0; i < nameKeys.length - 1; i++) { |
| 1426 | String curNameKey = nameKeys[i]; |
| 1427 | String nextNameKey = nameKeys[i + 1]; |
| 1428 | long curOffset = wallOffsets[i]; |
| 1429 | long nextOffset = wallOffsets[i + 1]; |
| 1430 | long curStdOffset = standardOffsets[i]; |
| 1431 | long nextStdOffset = standardOffsets[i + 1]; |
| 1432 | Period p = new Period(trans[i], trans[i + 1], PeriodType.yearMonthDay()); |
| 1433 | if (curOffset != nextOffset && |
| 1434 | curStdOffset == nextStdOffset && |
| 1435 | curNameKey.equals(nextNameKey) && |
| 1436 | p.getYears() == 0 && p.getMonths() > 4 && p.getMonths() < 8 && |
| 1437 | curNameKey.equals(zoneNameData[2]) && |
| 1438 | curNameKey.equals(zoneNameData[4])) { |
| 1439 | |
| 1440 | System.out.println("Fixing duplicate name key - " + nextNameKey); |
| 1441 | System.out.println(" - " + new DateTime(trans[i]) + " - " + new DateTime(trans[i + 1])); |
| 1442 | if (curOffset > nextOffset) { |
| 1443 | nameKeys[i] = (curNameKey + "-Summer").intern(); |
| 1444 | } else if (curOffset < nextOffset) { |
| 1445 | nameKeys[i + 1] = (nextNameKey + "-Summer").intern(); |
| 1446 | i++; |
| 1447 | } |
| 1448 | } |
| 1449 | } |
| 1450 | if (tailZone != null) { |
| 1451 | if (tailZone.iStartRecurrence.getNameKey().equals(tailZone.iEndRecurrence.getNameKey())) { |
| 1452 | System.out.println("Fixing duplicate recurrent name key - " + tailZone.iStartRecurrence.getNameKey()); |
| 1453 | if (tailZone.iStartRecurrence.getSaveMillis() > 0) { |
| 1454 | tailZone = new DSTZone( |
| 1455 | tailZone.getID(), |
| 1456 | tailZone.iStandardOffset, |
| 1457 | tailZone.iStartRecurrence.renameAppend("-Summer"), |
| 1458 | tailZone.iEndRecurrence); |
| 1459 | } else { |
| 1460 | tailZone = new DSTZone( |
| 1461 | tailZone.getID(), |
| 1462 | tailZone.iStandardOffset, |
| 1463 | tailZone.iStartRecurrence, |
| 1464 | tailZone.iEndRecurrence.renameAppend("-Summer")); |
| 1465 | } |
| 1466 | } |
| 1467 | } |
| 1468 | |
| 1469 | return new PrecalculatedZone((outputID ? id : ""), trans, wallOffsets, standardOffsets, nameKeys, tailZone); |
| 1470 | } |
| 1471 | |
| 1472 | // All array fields have the same length. |
| 1473 | |
| 1474 | private final long[] iTransitions; |
| 1475 | |
| 1476 | private final int[] iWallOffsets; |
| 1477 | private final int[] iStandardOffsets; |
| 1478 | private final String[] iNameKeys; |
| 1479 | |
| 1480 | private final DSTZone iTailZone; |
| 1481 | |
| 1482 | /** |
| 1483 | * Constructor used ONLY for valid input, loaded via static methods. |
| 1484 | */ |
| 1485 | private PrecalculatedZone(String id, long[] transitions, int[] wallOffsets, |
| 1486 | int[] standardOffsets, String[] nameKeys, DSTZone tailZone) |
| 1487 | { |
| 1488 | super(id); |
| 1489 | iTransitions = transitions; |
| 1490 | iWallOffsets = wallOffsets; |
| 1491 | iStandardOffsets = standardOffsets; |
| 1492 | iNameKeys = nameKeys; |
| 1493 | iTailZone = tailZone; |
| 1494 | } |
| 1495 | |
| 1496 | public String getNameKey(long instant) { |
| 1497 | long[] transitions = iTransitions; |
| 1498 | int i = Arrays.binarySearch(transitions, instant); |
| 1499 | if (i >= 0) { |
| 1500 | return iNameKeys[i]; |
| 1501 | } |
| 1502 | i = ~i; |
| 1503 | if (i < transitions.length) { |
| 1504 | if (i > 0) { |
| 1505 | return iNameKeys[i - 1]; |
| 1506 | } |
| 1507 | return "UTC"; |
| 1508 | } |
| 1509 | if (iTailZone == null) { |
| 1510 | return iNameKeys[i - 1]; |
| 1511 | } |
| 1512 | return iTailZone.getNameKey(instant); |
| 1513 | } |
| 1514 | |
| 1515 | public int getOffset(long instant) { |
| 1516 | long[] transitions = iTransitions; |
| 1517 | int i = Arrays.binarySearch(transitions, instant); |
| 1518 | if (i >= 0) { |
| 1519 | return iWallOffsets[i]; |
| 1520 | } |
| 1521 | i = ~i; |
| 1522 | if (i < transitions.length) { |
| 1523 | if (i > 0) { |
| 1524 | return iWallOffsets[i - 1]; |
| 1525 | } |
| 1526 | return 0; |
| 1527 | } |
| 1528 | if (iTailZone == null) { |
| 1529 | return iWallOffsets[i - 1]; |
| 1530 | } |
| 1531 | return iTailZone.getOffset(instant); |
| 1532 | } |
| 1533 | |
| 1534 | public int getStandardOffset(long instant) { |
| 1535 | long[] transitions = iTransitions; |
| 1536 | int i = Arrays.binarySearch(transitions, instant); |
| 1537 | if (i >= 0) { |
| 1538 | return iStandardOffsets[i]; |
| 1539 | } |
| 1540 | i = ~i; |
| 1541 | if (i < transitions.length) { |
| 1542 | if (i > 0) { |
| 1543 | return iStandardOffsets[i - 1]; |
| 1544 | } |
| 1545 | return 0; |
| 1546 | } |
| 1547 | if (iTailZone == null) { |
| 1548 | return iStandardOffsets[i - 1]; |
| 1549 | } |
| 1550 | return iTailZone.getStandardOffset(instant); |
| 1551 | } |
| 1552 | |
| 1553 | public boolean isFixed() { |
| 1554 | return false; |
| 1555 | } |
| 1556 | |
| 1557 | public long nextTransition(long instant) { |
| 1558 | long[] transitions = iTransitions; |
| 1559 | int i = Arrays.binarySearch(transitions, instant); |
| 1560 | i = (i >= 0) ? (i + 1) : ~i; |
| 1561 | if (i < transitions.length) { |
| 1562 | return transitions[i]; |
| 1563 | } |
| 1564 | if (iTailZone == null) { |
| 1565 | return instant; |
| 1566 | } |
| 1567 | long end = transitions[transitions.length - 1]; |
| 1568 | if (instant < end) { |
| 1569 | instant = end; |
| 1570 | } |
| 1571 | return iTailZone.nextTransition(instant); |
| 1572 | } |
| 1573 | |
| 1574 | public long previousTransition(long instant) { |
| 1575 | long[] transitions = iTransitions; |
| 1576 | int i = Arrays.binarySearch(transitions, instant); |
| 1577 | if (i >= 0) { |
| 1578 | if (instant > Long.MIN_VALUE) { |
| 1579 | return instant - 1; |
| 1580 | } |
| 1581 | return instant; |
| 1582 | } |
| 1583 | i = ~i; |
| 1584 | if (i < transitions.length) { |
| 1585 | if (i > 0) { |
| 1586 | long prev = transitions[i - 1]; |
| 1587 | if (prev > Long.MIN_VALUE) { |
| 1588 | return prev - 1; |
| 1589 | } |
| 1590 | } |
| 1591 | return instant; |
| 1592 | } |
| 1593 | if (iTailZone != null) { |
| 1594 | long prev = iTailZone.previousTransition(instant); |
| 1595 | if (prev < instant) { |
| 1596 | return prev; |
| 1597 | } |
| 1598 | } |
| 1599 | long prev = transitions[i - 1]; |
| 1600 | if (prev > Long.MIN_VALUE) { |
| 1601 | return prev - 1; |
| 1602 | } |
| 1603 | return instant; |
| 1604 | } |
| 1605 | |
| 1606 | public boolean equals(Object obj) { |
| 1607 | if (this == obj) { |
| 1608 | return true; |
| 1609 | } |
| 1610 | if (obj instanceof PrecalculatedZone) { |
| 1611 | PrecalculatedZone other = (PrecalculatedZone)obj; |
| 1612 | return |
| 1613 | getID().equals(other.getID()) && |
| 1614 | Arrays.equals(iTransitions, other.iTransitions) && |
| 1615 | Arrays.equals(iNameKeys, other.iNameKeys) && |
| 1616 | Arrays.equals(iWallOffsets, other.iWallOffsets) && |
| 1617 | Arrays.equals(iStandardOffsets, other.iStandardOffsets) && |
| 1618 | ((iTailZone == null) |
| 1619 | ? (null == other.iTailZone) |
| 1620 | : (iTailZone.equals(other.iTailZone))); |
| 1621 | } |
| 1622 | return false; |
| 1623 | } |
| 1624 | |
| 1625 | public void writeTo(DataOutput out) throws IOException { |
| 1626 | int size = iTransitions.length; |
| 1627 | |
| 1628 | // Create unique string pool. |
| 1629 | Set poolSet = new HashSet(); |
| 1630 | for (int i=0; i<size; i++) { |
| 1631 | poolSet.add(iNameKeys[i]); |
| 1632 | } |
| 1633 | |
| 1634 | int poolSize = poolSet.size(); |
| 1635 | if (poolSize > 65535) { |
| 1636 | throw new UnsupportedOperationException("String pool is too large"); |
| 1637 | } |
| 1638 | String[] pool = new String[poolSize]; |
| 1639 | Iterator it = poolSet.iterator(); |
| 1640 | for (int i=0; it.hasNext(); i++) { |
| 1641 | pool[i] = (String)it.next(); |
| 1642 | } |
| 1643 | |
| 1644 | // Write out the pool. |
| 1645 | out.writeShort(poolSize); |
| 1646 | for (int i=0; i<poolSize; i++) { |
| 1647 | out.writeUTF(pool[i]); |
| 1648 | } |
| 1649 | |
| 1650 | out.writeInt(size); |
| 1651 | |
| 1652 | for (int i=0; i<size; i++) { |
| 1653 | writeMillis(out, iTransitions[i]); |
| 1654 | writeMillis(out, iWallOffsets[i]); |
| 1655 | writeMillis(out, iStandardOffsets[i]); |
| 1656 | |
| 1657 | // Find pool index and write it out. |
| 1658 | String nameKey = iNameKeys[i]; |
| 1659 | for (int j=0; j<poolSize; j++) { |
| 1660 | if (pool[j].equals(nameKey)) { |
| 1661 | if (poolSize < 256) { |
| 1662 | out.writeByte(j); |
| 1663 | } else { |
| 1664 | out.writeShort(j); |
| 1665 | } |
| 1666 | break; |
| 1667 | } |
| 1668 | } |
| 1669 | } |
| 1670 | |
| 1671 | out.writeBoolean(iTailZone != null); |
| 1672 | if (iTailZone != null) { |
| 1673 | iTailZone.writeTo(out); |
| 1674 | } |
| 1675 | } |
| 1676 | |
| 1677 | public boolean isCachable() { |
| 1678 | if (iTailZone != null) { |
| 1679 | return true; |
| 1680 | } |
| 1681 | long[] transitions = iTransitions; |
| 1682 | if (transitions.length <= 1) { |
| 1683 | return false; |
| 1684 | } |
| 1685 | |
| 1686 | // Add up all the distances between transitions that are less than |
| 1687 | // about two years. |
| 1688 | double distances = 0; |
| 1689 | int count = 0; |
| 1690 | |
| 1691 | for (int i=1; i<transitions.length; i++) { |
| 1692 | long diff = transitions[i] - transitions[i - 1]; |
| 1693 | if (diff < ((366L + 365) * 24 * 60 * 60 * 1000)) { |
| 1694 | distances += (double)diff; |
| 1695 | count++; |
| 1696 | } |
| 1697 | } |
| 1698 | |
| 1699 | if (count > 0) { |
| 1700 | double avg = distances / count; |
| 1701 | avg /= 24 * 60 * 60 * 1000; |
| 1702 | if (avg >= 25) { |
| 1703 | // Only bother caching if average distance between |
| 1704 | // transitions is at least 25 days. Why 25? |
| 1705 | // CachedDateTimeZone is more efficient if the distance |
| 1706 | // between transitions is large. With an average of 25, it |
| 1707 | // will on average perform about 2 tests per cache |
| 1708 | // hit. (49.7 / 25) is approximately 2. |
| 1709 | return true; |
| 1710 | } |
| 1711 | } |
| 1712 | |
| 1713 | return false; |
| 1714 | } |
| 1715 | } |
| 1716 | } |