| /* |
| * Copyright (c) 2012, 2015, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * This code 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 |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| /* |
| * This file is available under and governed by the GNU General Public |
| * License version 2 only, as published by the Free Software Foundation. |
| * However, the following notice accompanied the original version of this |
| * file: |
| * |
| * Copyright (c) 2007-2012, Stephen Colebourne & Michael Nascimento Santos |
| * |
| * All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions are met: |
| * |
| * * Redistributions of source code must retain the above copyright notice, |
| * this list of conditions and the following disclaimer. |
| * |
| * * Redistributions in binary form must reproduce the above copyright notice, |
| * this list of conditions and the following disclaimer in the documentation |
| * and/or other materials provided with the distribution. |
| * |
| * * Neither the name of JSR-310 nor the names of its contributors |
| * may be used to endorse or promote products derived from this software |
| * without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR |
| * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, |
| * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
| * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR |
| * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF |
| * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING |
| * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS |
| * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| package java.time; |
| |
| import static java.time.LocalTime.MINUTES_PER_HOUR; |
| import static java.time.LocalTime.SECONDS_PER_HOUR; |
| import static java.time.LocalTime.SECONDS_PER_MINUTE; |
| import static java.time.temporal.ChronoField.OFFSET_SECONDS; |
| |
| import java.io.DataInput; |
| import java.io.DataOutput; |
| import java.io.IOException; |
| import java.io.InvalidObjectException; |
| import java.io.ObjectInputStream; |
| import java.io.Serializable; |
| import java.time.temporal.ChronoField; |
| import java.time.temporal.Temporal; |
| import java.time.temporal.TemporalAccessor; |
| import java.time.temporal.TemporalAdjuster; |
| import java.time.temporal.TemporalField; |
| import java.time.temporal.TemporalQueries; |
| import java.time.temporal.TemporalQuery; |
| import java.time.temporal.UnsupportedTemporalTypeException; |
| import java.time.temporal.ValueRange; |
| import java.time.zone.ZoneRules; |
| import java.util.Objects; |
| import java.util.concurrent.ConcurrentHashMap; |
| import java.util.concurrent.ConcurrentMap; |
| |
| /** |
| * A time-zone offset from Greenwich/UTC, such as {@code +02:00}. |
| * <p> |
| * A time-zone offset is the amount of time that a time-zone differs from Greenwich/UTC. |
| * This is usually a fixed number of hours and minutes. |
| * <p> |
| * Different parts of the world have different time-zone offsets. |
| * The rules for how offsets vary by place and time of year are captured in the |
| * {@link ZoneId} class. |
| * <p> |
| * For example, Paris is one hour ahead of Greenwich/UTC in winter and two hours |
| * ahead in summer. The {@code ZoneId} instance for Paris will reference two |
| * {@code ZoneOffset} instances - a {@code +01:00} instance for winter, |
| * and a {@code +02:00} instance for summer. |
| * <p> |
| * In 2008, time-zone offsets around the world extended from -12:00 to +14:00. |
| * To prevent any problems with that range being extended, yet still provide |
| * validation, the range of offsets is restricted to -18:00 to 18:00 inclusive. |
| * <p> |
| * This class is designed for use with the ISO calendar system. |
| * The fields of hours, minutes and seconds make assumptions that are valid for the |
| * standard ISO definitions of those fields. This class may be used with other |
| * calendar systems providing the definition of the time fields matches those |
| * of the ISO calendar system. |
| * <p> |
| * Instances of {@code ZoneOffset} must be compared using {@link #equals}. |
| * Implementations may choose to cache certain common offsets, however |
| * applications must not rely on such caching. |
| * |
| * <p> |
| * This is a <a href="{@docRoot}/java/lang/doc-files/ValueBased.html">value-based</a> |
| * class; use of identity-sensitive operations (including reference equality |
| * ({@code ==}), identity hash code, or synchronization) on instances of |
| * {@code ZoneOffset} may have unpredictable results and should be avoided. |
| * The {@code equals} method should be used for comparisons. |
| * |
| * @implSpec |
| * This class is immutable and thread-safe. |
| * |
| * @since 1.8 |
| */ |
| public final class ZoneOffset |
| extends ZoneId |
| implements TemporalAccessor, TemporalAdjuster, Comparable<ZoneOffset>, Serializable { |
| |
| /** Cache of time-zone offset by offset in seconds. */ |
| private static final ConcurrentMap<Integer, ZoneOffset> SECONDS_CACHE = new ConcurrentHashMap<>(16, 0.75f, 4); |
| /** Cache of time-zone offset by ID. */ |
| private static final ConcurrentMap<String, ZoneOffset> ID_CACHE = new ConcurrentHashMap<>(16, 0.75f, 4); |
| |
| /** |
| * The abs maximum seconds. |
| */ |
| private static final int MAX_SECONDS = 18 * SECONDS_PER_HOUR; |
| /** |
| * Serialization version. |
| */ |
| private static final long serialVersionUID = 2357656521762053153L; |
| |
| /** |
| * The time-zone offset for UTC, with an ID of 'Z'. |
| */ |
| public static final ZoneOffset UTC = ZoneOffset.ofTotalSeconds(0); |
| /** |
| * Constant for the maximum supported offset. |
| */ |
| public static final ZoneOffset MIN = ZoneOffset.ofTotalSeconds(-MAX_SECONDS); |
| /** |
| * Constant for the maximum supported offset. |
| */ |
| public static final ZoneOffset MAX = ZoneOffset.ofTotalSeconds(MAX_SECONDS); |
| |
| /** |
| * The total offset in seconds. |
| */ |
| private final int totalSeconds; |
| /** |
| * The string form of the time-zone offset. |
| */ |
| private final transient String id; |
| |
| //----------------------------------------------------------------------- |
| /** |
| * Obtains an instance of {@code ZoneOffset} using the ID. |
| * <p> |
| * This method parses the string ID of a {@code ZoneOffset} to |
| * return an instance. The parsing accepts all the formats generated by |
| * {@link #getId()}, plus some additional formats: |
| * <ul> |
| * <li>{@code Z} - for UTC |
| * <li>{@code +h} |
| * <li>{@code +hh} |
| * <li>{@code +hh:mm} |
| * <li>{@code -hh:mm} |
| * <li>{@code +hhmm} |
| * <li>{@code -hhmm} |
| * <li>{@code +hh:mm:ss} |
| * <li>{@code -hh:mm:ss} |
| * <li>{@code +hhmmss} |
| * <li>{@code -hhmmss} |
| * </ul> |
| * Note that ± means either the plus or minus symbol. |
| * <p> |
| * The ID of the returned offset will be normalized to one of the formats |
| * described by {@link #getId()}. |
| * <p> |
| * The maximum supported range is from +18:00 to -18:00 inclusive. |
| * |
| * @param offsetId the offset ID, not null |
| * @return the zone-offset, not null |
| * @throws DateTimeException if the offset ID is invalid |
| */ |
| @SuppressWarnings("fallthrough") |
| public static ZoneOffset of(String offsetId) { |
| Objects.requireNonNull(offsetId, "offsetId"); |
| // "Z" is always in the cache |
| ZoneOffset offset = ID_CACHE.get(offsetId); |
| if (offset != null) { |
| return offset; |
| } |
| |
| // parse - +h, +hh, +hhmm, +hh:mm, +hhmmss, +hh:mm:ss |
| final int hours, minutes, seconds; |
| switch (offsetId.length()) { |
| case 2: |
| offsetId = offsetId.charAt(0) + "0" + offsetId.charAt(1); // fallthru |
| case 3: |
| hours = parseNumber(offsetId, 1, false); |
| minutes = 0; |
| seconds = 0; |
| break; |
| case 5: |
| hours = parseNumber(offsetId, 1, false); |
| minutes = parseNumber(offsetId, 3, false); |
| seconds = 0; |
| break; |
| case 6: |
| hours = parseNumber(offsetId, 1, false); |
| minutes = parseNumber(offsetId, 4, true); |
| seconds = 0; |
| break; |
| case 7: |
| hours = parseNumber(offsetId, 1, false); |
| minutes = parseNumber(offsetId, 3, false); |
| seconds = parseNumber(offsetId, 5, false); |
| break; |
| case 9: |
| hours = parseNumber(offsetId, 1, false); |
| minutes = parseNumber(offsetId, 4, true); |
| seconds = parseNumber(offsetId, 7, true); |
| break; |
| default: |
| throw new DateTimeException("Invalid ID for ZoneOffset, invalid format: " + offsetId); |
| } |
| char first = offsetId.charAt(0); |
| if (first != '+' && first != '-') { |
| throw new DateTimeException("Invalid ID for ZoneOffset, plus/minus not found when expected: " + offsetId); |
| } |
| if (first == '-') { |
| return ofHoursMinutesSeconds(-hours, -minutes, -seconds); |
| } else { |
| return ofHoursMinutesSeconds(hours, minutes, seconds); |
| } |
| } |
| |
| /** |
| * Parse a two digit zero-prefixed number. |
| * |
| * @param offsetId the offset ID, not null |
| * @param pos the position to parse, valid |
| * @param precededByColon should this number be prefixed by a precededByColon |
| * @return the parsed number, from 0 to 99 |
| */ |
| private static int parseNumber(CharSequence offsetId, int pos, boolean precededByColon) { |
| if (precededByColon && offsetId.charAt(pos - 1) != ':') { |
| throw new DateTimeException("Invalid ID for ZoneOffset, colon not found when expected: " + offsetId); |
| } |
| char ch1 = offsetId.charAt(pos); |
| char ch2 = offsetId.charAt(pos + 1); |
| if (ch1 < '0' || ch1 > '9' || ch2 < '0' || ch2 > '9') { |
| throw new DateTimeException("Invalid ID for ZoneOffset, non numeric characters found: " + offsetId); |
| } |
| return (ch1 - 48) * 10 + (ch2 - 48); |
| } |
| |
| //----------------------------------------------------------------------- |
| /** |
| * Obtains an instance of {@code ZoneOffset} using an offset in hours. |
| * |
| * @param hours the time-zone offset in hours, from -18 to +18 |
| * @return the zone-offset, not null |
| * @throws DateTimeException if the offset is not in the required range |
| */ |
| public static ZoneOffset ofHours(int hours) { |
| return ofHoursMinutesSeconds(hours, 0, 0); |
| } |
| |
| /** |
| * Obtains an instance of {@code ZoneOffset} using an offset in |
| * hours and minutes. |
| * <p> |
| * The sign of the hours and minutes components must match. |
| * Thus, if the hours is negative, the minutes must be negative or zero. |
| * If the hours is zero, the minutes may be positive, negative or zero. |
| * |
| * @param hours the time-zone offset in hours, from -18 to +18 |
| * @param minutes the time-zone offset in minutes, from 0 to ±59, sign matches hours |
| * @return the zone-offset, not null |
| * @throws DateTimeException if the offset is not in the required range |
| */ |
| public static ZoneOffset ofHoursMinutes(int hours, int minutes) { |
| return ofHoursMinutesSeconds(hours, minutes, 0); |
| } |
| |
| /** |
| * Obtains an instance of {@code ZoneOffset} using an offset in |
| * hours, minutes and seconds. |
| * <p> |
| * The sign of the hours, minutes and seconds components must match. |
| * Thus, if the hours is negative, the minutes and seconds must be negative or zero. |
| * |
| * @param hours the time-zone offset in hours, from -18 to +18 |
| * @param minutes the time-zone offset in minutes, from 0 to ±59, sign matches hours and seconds |
| * @param seconds the time-zone offset in seconds, from 0 to ±59, sign matches hours and minutes |
| * @return the zone-offset, not null |
| * @throws DateTimeException if the offset is not in the required range |
| */ |
| public static ZoneOffset ofHoursMinutesSeconds(int hours, int minutes, int seconds) { |
| validate(hours, minutes, seconds); |
| int totalSeconds = totalSeconds(hours, minutes, seconds); |
| return ofTotalSeconds(totalSeconds); |
| } |
| |
| //----------------------------------------------------------------------- |
| /** |
| * Obtains an instance of {@code ZoneOffset} from a temporal object. |
| * <p> |
| * This obtains an offset based on the specified temporal. |
| * A {@code TemporalAccessor} represents an arbitrary set of date and time information, |
| * which this factory converts to an instance of {@code ZoneOffset}. |
| * <p> |
| * A {@code TemporalAccessor} represents some form of date and time information. |
| * This factory converts the arbitrary temporal object to an instance of {@code ZoneOffset}. |
| * <p> |
| * The conversion uses the {@link TemporalQueries#offset()} query, which relies |
| * on extracting the {@link ChronoField#OFFSET_SECONDS OFFSET_SECONDS} field. |
| * <p> |
| * This method matches the signature of the functional interface {@link TemporalQuery} |
| * allowing it to be used as a query via method reference, {@code ZoneOffset::from}. |
| * |
| * @param temporal the temporal object to convert, not null |
| * @return the zone-offset, not null |
| * @throws DateTimeException if unable to convert to an {@code ZoneOffset} |
| */ |
| public static ZoneOffset from(TemporalAccessor temporal) { |
| Objects.requireNonNull(temporal, "temporal"); |
| ZoneOffset offset = temporal.query(TemporalQueries.offset()); |
| if (offset == null) { |
| throw new DateTimeException("Unable to obtain ZoneOffset from TemporalAccessor: " + |
| temporal + " of type " + temporal.getClass().getName()); |
| } |
| return offset; |
| } |
| |
| //----------------------------------------------------------------------- |
| /** |
| * Validates the offset fields. |
| * |
| * @param hours the time-zone offset in hours, from -18 to +18 |
| * @param minutes the time-zone offset in minutes, from 0 to ±59 |
| * @param seconds the time-zone offset in seconds, from 0 to ±59 |
| * @throws DateTimeException if the offset is not in the required range |
| */ |
| private static void validate(int hours, int minutes, int seconds) { |
| if (hours < -18 || hours > 18) { |
| throw new DateTimeException("Zone offset hours not in valid range: value " + hours + |
| " is not in the range -18 to 18"); |
| } |
| if (hours > 0) { |
| if (minutes < 0 || seconds < 0) { |
| throw new DateTimeException("Zone offset minutes and seconds must be positive because hours is positive"); |
| } |
| } else if (hours < 0) { |
| if (minutes > 0 || seconds > 0) { |
| throw new DateTimeException("Zone offset minutes and seconds must be negative because hours is negative"); |
| } |
| } else if ((minutes > 0 && seconds < 0) || (minutes < 0 && seconds > 0)) { |
| throw new DateTimeException("Zone offset minutes and seconds must have the same sign"); |
| } |
| if (Math.abs(minutes) > 59) { |
| throw new DateTimeException("Zone offset minutes not in valid range: abs(value) " + |
| Math.abs(minutes) + " is not in the range 0 to 59"); |
| } |
| if (Math.abs(seconds) > 59) { |
| throw new DateTimeException("Zone offset seconds not in valid range: abs(value) " + |
| Math.abs(seconds) + " is not in the range 0 to 59"); |
| } |
| if (Math.abs(hours) == 18 && (Math.abs(minutes) > 0 || Math.abs(seconds) > 0)) { |
| throw new DateTimeException("Zone offset not in valid range: -18:00 to +18:00"); |
| } |
| } |
| |
| /** |
| * Calculates the total offset in seconds. |
| * |
| * @param hours the time-zone offset in hours, from -18 to +18 |
| * @param minutes the time-zone offset in minutes, from 0 to ±59, sign matches hours and seconds |
| * @param seconds the time-zone offset in seconds, from 0 to ±59, sign matches hours and minutes |
| * @return the total in seconds |
| */ |
| private static int totalSeconds(int hours, int minutes, int seconds) { |
| return hours * SECONDS_PER_HOUR + minutes * SECONDS_PER_MINUTE + seconds; |
| } |
| |
| //----------------------------------------------------------------------- |
| /** |
| * Obtains an instance of {@code ZoneOffset} specifying the total offset in seconds |
| * <p> |
| * The offset must be in the range {@code -18:00} to {@code +18:00}, which corresponds to -64800 to +64800. |
| * |
| * @param totalSeconds the total time-zone offset in seconds, from -64800 to +64800 |
| * @return the ZoneOffset, not null |
| * @throws DateTimeException if the offset is not in the required range |
| */ |
| public static ZoneOffset ofTotalSeconds(int totalSeconds) { |
| if (Math.abs(totalSeconds) > MAX_SECONDS) { |
| throw new DateTimeException("Zone offset not in valid range: -18:00 to +18:00"); |
| } |
| if (totalSeconds % (15 * SECONDS_PER_MINUTE) == 0) { |
| Integer totalSecs = totalSeconds; |
| ZoneOffset result = SECONDS_CACHE.get(totalSecs); |
| if (result == null) { |
| result = new ZoneOffset(totalSeconds); |
| SECONDS_CACHE.putIfAbsent(totalSecs, result); |
| result = SECONDS_CACHE.get(totalSecs); |
| ID_CACHE.putIfAbsent(result.getId(), result); |
| } |
| return result; |
| } else { |
| return new ZoneOffset(totalSeconds); |
| } |
| } |
| |
| //----------------------------------------------------------------------- |
| /** |
| * Constructor. |
| * |
| * @param totalSeconds the total time-zone offset in seconds, from -64800 to +64800 |
| */ |
| private ZoneOffset(int totalSeconds) { |
| super(); |
| this.totalSeconds = totalSeconds; |
| id = buildId(totalSeconds); |
| } |
| |
| private static String buildId(int totalSeconds) { |
| if (totalSeconds == 0) { |
| return "Z"; |
| } else { |
| int absTotalSeconds = Math.abs(totalSeconds); |
| StringBuilder buf = new StringBuilder(); |
| int absHours = absTotalSeconds / SECONDS_PER_HOUR; |
| int absMinutes = (absTotalSeconds / SECONDS_PER_MINUTE) % MINUTES_PER_HOUR; |
| buf.append(totalSeconds < 0 ? "-" : "+") |
| .append(absHours < 10 ? "0" : "").append(absHours) |
| .append(absMinutes < 10 ? ":0" : ":").append(absMinutes); |
| int absSeconds = absTotalSeconds % SECONDS_PER_MINUTE; |
| if (absSeconds != 0) { |
| buf.append(absSeconds < 10 ? ":0" : ":").append(absSeconds); |
| } |
| return buf.toString(); |
| } |
| } |
| |
| //----------------------------------------------------------------------- |
| /** |
| * Gets the total zone offset in seconds. |
| * <p> |
| * This is the primary way to access the offset amount. |
| * It returns the total of the hours, minutes and seconds fields as a |
| * single offset that can be added to a time. |
| * |
| * @return the total zone offset amount in seconds |
| */ |
| public int getTotalSeconds() { |
| return totalSeconds; |
| } |
| |
| /** |
| * Gets the normalized zone offset ID. |
| * <p> |
| * The ID is minor variation to the standard ISO-8601 formatted string |
| * for the offset. There are three formats: |
| * <ul> |
| * <li>{@code Z} - for UTC (ISO-8601) |
| * <li>{@code +hh:mm} or {@code -hh:mm} - if the seconds are zero (ISO-8601) |
| * <li>{@code +hh:mm:ss} or {@code -hh:mm:ss} - if the seconds are non-zero (not ISO-8601) |
| * </ul> |
| * |
| * @return the zone offset ID, not null |
| */ |
| @Override |
| public String getId() { |
| return id; |
| } |
| |
| /** |
| * Gets the associated time-zone rules. |
| * <p> |
| * The rules will always return this offset when queried. |
| * The implementation class is immutable, thread-safe and serializable. |
| * |
| * @return the rules, not null |
| */ |
| @Override |
| public ZoneRules getRules() { |
| return ZoneRules.of(this); |
| } |
| |
| //----------------------------------------------------------------------- |
| /** |
| * Checks if the specified field is supported. |
| * <p> |
| * This checks if this offset can be queried for the specified field. |
| * If false, then calling the {@link #range(TemporalField) range} and |
| * {@link #get(TemporalField) get} methods will throw an exception. |
| * <p> |
| * If the field is a {@link ChronoField} then the query is implemented here. |
| * The {@code OFFSET_SECONDS} field returns true. |
| * All other {@code ChronoField} instances will return false. |
| * <p> |
| * If the field is not a {@code ChronoField}, then the result of this method |
| * is obtained by invoking {@code TemporalField.isSupportedBy(TemporalAccessor)} |
| * passing {@code this} as the argument. |
| * Whether the field is supported is determined by the field. |
| * |
| * @param field the field to check, null returns false |
| * @return true if the field is supported on this offset, false if not |
| */ |
| @Override |
| public boolean isSupported(TemporalField field) { |
| if (field instanceof ChronoField) { |
| return field == OFFSET_SECONDS; |
| } |
| return field != null && field.isSupportedBy(this); |
| } |
| |
| /** |
| * Gets the range of valid values for the specified field. |
| * <p> |
| * The range object expresses the minimum and maximum valid values for a field. |
| * This offset is used to enhance the accuracy of the returned range. |
| * If it is not possible to return the range, because the field is not supported |
| * or for some other reason, an exception is thrown. |
| * <p> |
| * If the field is a {@link ChronoField} then the query is implemented here. |
| * The {@link #isSupported(TemporalField) supported fields} will return |
| * appropriate range instances. |
| * All other {@code ChronoField} instances will throw an {@code UnsupportedTemporalTypeException}. |
| * <p> |
| * If the field is not a {@code ChronoField}, then the result of this method |
| * is obtained by invoking {@code TemporalField.rangeRefinedBy(TemporalAccessor)} |
| * passing {@code this} as the argument. |
| * Whether the range can be obtained is determined by the field. |
| * |
| * @param field the field to query the range for, not null |
| * @return the range of valid values for the field, not null |
| * @throws DateTimeException if the range for the field cannot be obtained |
| * @throws UnsupportedTemporalTypeException if the field is not supported |
| */ |
| @Override // override for Javadoc |
| public ValueRange range(TemporalField field) { |
| return TemporalAccessor.super.range(field); |
| } |
| |
| /** |
| * Gets the value of the specified field from this offset as an {@code int}. |
| * <p> |
| * This queries this offset for the value of the specified field. |
| * The returned value will always be within the valid range of values for the field. |
| * If it is not possible to return the value, because the field is not supported |
| * or for some other reason, an exception is thrown. |
| * <p> |
| * If the field is a {@link ChronoField} then the query is implemented here. |
| * The {@code OFFSET_SECONDS} field returns the value of the offset. |
| * All other {@code ChronoField} instances will throw an {@code UnsupportedTemporalTypeException}. |
| * <p> |
| * If the field is not a {@code ChronoField}, then the result of this method |
| * is obtained by invoking {@code TemporalField.getFrom(TemporalAccessor)} |
| * passing {@code this} as the argument. Whether the value can be obtained, |
| * and what the value represents, is determined by the field. |
| * |
| * @param field the field to get, not null |
| * @return the value for the field |
| * @throws DateTimeException if a value for the field cannot be obtained or |
| * the value is outside the range of valid values for the field |
| * @throws UnsupportedTemporalTypeException if the field is not supported or |
| * the range of values exceeds an {@code int} |
| * @throws ArithmeticException if numeric overflow occurs |
| */ |
| @Override // override for Javadoc and performance |
| public int get(TemporalField field) { |
| if (field == OFFSET_SECONDS) { |
| return totalSeconds; |
| } else if (field instanceof ChronoField) { |
| throw new UnsupportedTemporalTypeException("Unsupported field: " + field); |
| } |
| return range(field).checkValidIntValue(getLong(field), field); |
| } |
| |
| /** |
| * Gets the value of the specified field from this offset as a {@code long}. |
| * <p> |
| * This queries this offset for the value of the specified field. |
| * If it is not possible to return the value, because the field is not supported |
| * or for some other reason, an exception is thrown. |
| * <p> |
| * If the field is a {@link ChronoField} then the query is implemented here. |
| * The {@code OFFSET_SECONDS} field returns the value of the offset. |
| * All other {@code ChronoField} instances will throw an {@code UnsupportedTemporalTypeException}. |
| * <p> |
| * If the field is not a {@code ChronoField}, then the result of this method |
| * is obtained by invoking {@code TemporalField.getFrom(TemporalAccessor)} |
| * passing {@code this} as the argument. Whether the value can be obtained, |
| * and what the value represents, is determined by the field. |
| * |
| * @param field the field to get, not null |
| * @return the value for the field |
| * @throws DateTimeException if a value for the field cannot be obtained |
| * @throws UnsupportedTemporalTypeException if the field is not supported |
| * @throws ArithmeticException if numeric overflow occurs |
| */ |
| @Override |
| public long getLong(TemporalField field) { |
| if (field == OFFSET_SECONDS) { |
| return totalSeconds; |
| } else if (field instanceof ChronoField) { |
| throw new UnsupportedTemporalTypeException("Unsupported field: " + field); |
| } |
| return field.getFrom(this); |
| } |
| |
| //----------------------------------------------------------------------- |
| /** |
| * Queries this offset using the specified query. |
| * <p> |
| * This queries this offset using the specified query strategy object. |
| * The {@code TemporalQuery} object defines the logic to be used to |
| * obtain the result. Read the documentation of the query to understand |
| * what the result of this method will be. |
| * <p> |
| * The result of this method is obtained by invoking the |
| * {@link TemporalQuery#queryFrom(TemporalAccessor)} method on the |
| * specified query passing {@code this} as the argument. |
| * |
| * @param <R> the type of the result |
| * @param query the query to invoke, not null |
| * @return the query result, null may be returned (defined by the query) |
| * @throws DateTimeException if unable to query (defined by the query) |
| * @throws ArithmeticException if numeric overflow occurs (defined by the query) |
| */ |
| @SuppressWarnings("unchecked") |
| @Override |
| public <R> R query(TemporalQuery<R> query) { |
| if (query == TemporalQueries.offset() || query == TemporalQueries.zone()) { |
| return (R) this; |
| } |
| return TemporalAccessor.super.query(query); |
| } |
| |
| /** |
| * Adjusts the specified temporal object to have the same offset as this object. |
| * <p> |
| * This returns a temporal object of the same observable type as the input |
| * with the offset changed to be the same as this. |
| * <p> |
| * The adjustment is equivalent to using {@link Temporal#with(TemporalField, long)} |
| * passing {@link ChronoField#OFFSET_SECONDS} as the field. |
| * <p> |
| * In most cases, it is clearer to reverse the calling pattern by using |
| * {@link Temporal#with(TemporalAdjuster)}: |
| * <pre> |
| * // these two lines are equivalent, but the second approach is recommended |
| * temporal = thisOffset.adjustInto(temporal); |
| * temporal = temporal.with(thisOffset); |
| * </pre> |
| * <p> |
| * This instance is immutable and unaffected by this method call. |
| * |
| * @param temporal the target object to be adjusted, not null |
| * @return the adjusted object, not null |
| * @throws DateTimeException if unable to make the adjustment |
| * @throws ArithmeticException if numeric overflow occurs |
| */ |
| @Override |
| public Temporal adjustInto(Temporal temporal) { |
| return temporal.with(OFFSET_SECONDS, totalSeconds); |
| } |
| |
| //----------------------------------------------------------------------- |
| /** |
| * Compares this offset to another offset in descending order. |
| * <p> |
| * The offsets are compared in the order that they occur for the same time |
| * of day around the world. Thus, an offset of {@code +10:00} comes before an |
| * offset of {@code +09:00} and so on down to {@code -18:00}. |
| * <p> |
| * The comparison is "consistent with equals", as defined by {@link Comparable}. |
| * |
| * @param other the other date to compare to, not null |
| * @return the comparator value, negative if less, postive if greater |
| * @throws NullPointerException if {@code other} is null |
| */ |
| @Override |
| public int compareTo(ZoneOffset other) { |
| return other.totalSeconds - totalSeconds; |
| } |
| |
| //----------------------------------------------------------------------- |
| /** |
| * Checks if this offset is equal to another offset. |
| * <p> |
| * The comparison is based on the amount of the offset in seconds. |
| * This is equivalent to a comparison by ID. |
| * |
| * @param obj the object to check, null returns false |
| * @return true if this is equal to the other offset |
| */ |
| @Override |
| public boolean equals(Object obj) { |
| if (this == obj) { |
| return true; |
| } |
| if (obj instanceof ZoneOffset) { |
| return totalSeconds == ((ZoneOffset) obj).totalSeconds; |
| } |
| return false; |
| } |
| |
| /** |
| * A hash code for this offset. |
| * |
| * @return a suitable hash code |
| */ |
| @Override |
| public int hashCode() { |
| return totalSeconds; |
| } |
| |
| //----------------------------------------------------------------------- |
| /** |
| * Outputs this offset as a {@code String}, using the normalized ID. |
| * |
| * @return a string representation of this offset, not null |
| */ |
| @Override |
| public String toString() { |
| return id; |
| } |
| |
| // ----------------------------------------------------------------------- |
| /** |
| * Writes the object using a |
| * <a href="../../serialized-form.html#java.time.Ser">dedicated serialized form</a>. |
| * @serialData |
| * <pre> |
| * out.writeByte(8); // identifies a ZoneOffset |
| * int offsetByte = totalSeconds % 900 == 0 ? totalSeconds / 900 : 127; |
| * out.writeByte(offsetByte); |
| * if (offsetByte == 127) { |
| * out.writeInt(totalSeconds); |
| * } |
| * </pre> |
| * |
| * @return the instance of {@code Ser}, not null |
| */ |
| private Object writeReplace() { |
| return new Ser(Ser.ZONE_OFFSET_TYPE, this); |
| } |
| |
| /** |
| * Defend against malicious streams. |
| * |
| * @param s the stream to read |
| * @throws InvalidObjectException always |
| */ |
| private void readObject(ObjectInputStream s) throws InvalidObjectException { |
| throw new InvalidObjectException("Deserialization via serialization delegate"); |
| } |
| |
| @Override |
| void write(DataOutput out) throws IOException { |
| out.writeByte(Ser.ZONE_OFFSET_TYPE); |
| writeExternal(out); |
| } |
| |
| void writeExternal(DataOutput out) throws IOException { |
| final int offsetSecs = totalSeconds; |
| int offsetByte = offsetSecs % 900 == 0 ? offsetSecs / 900 : 127; // compress to -72 to +72 |
| out.writeByte(offsetByte); |
| if (offsetByte == 127) { |
| out.writeInt(offsetSecs); |
| } |
| } |
| |
| static ZoneOffset readExternal(DataInput in) throws IOException { |
| int offsetByte = in.readByte(); |
| return (offsetByte == 127 ? ZoneOffset.ofTotalSeconds(in.readInt()) : ZoneOffset.ofTotalSeconds(offsetByte * 900)); |
| } |
| |
| } |
