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/*
 *  Copyright 2001-2013 Stephen Colebourne
 *
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 */
package org.joda.time.chrono;

import java.util.HashMap;
import java.util.Locale;

import org.joda.time.Chronology;
import org.joda.time.DateTimeConstants;
import org.joda.time.DateTimeField;
import org.joda.time.DateTimeZone;
import org.joda.time.DurationField;
import org.joda.time.IllegalFieldValueException;
import org.joda.time.IllegalInstantException;
import org.joda.time.ReadablePartial;
import org.joda.time.field.BaseDateTimeField;
import org.joda.time.field.BaseDurationField;

/**
 * Wraps another Chronology to add support for time zones.
 * 

* ZonedChronology is thread-safe and immutable. * * @author Brian S O'Neill * @author Stephen Colebourne * @since 1.0 */ public final class ZonedChronology extends AssembledChronology { /** Serialization lock */ private static final long serialVersionUID = -1079258847191166848L; /** * Create a ZonedChronology for any chronology, overriding any time zone it * may already have. * * @param base base chronology to wrap * @param zone the time zone * @throws IllegalArgumentException if chronology or time zone is null */ public static ZonedChronology getInstance(Chronology base, DateTimeZone zone) { if (base == null) { throw new IllegalArgumentException("Must supply a chronology"); } base = base.withUTC(); if (base == null) { throw new IllegalArgumentException("UTC chronology must not be null"); } if (zone == null) { throw new IllegalArgumentException("DateTimeZone must not be null"); } return new ZonedChronology(base, zone); } static boolean useTimeArithmetic(DurationField field) { // Use time of day arithmetic rules for unit durations less than // typical time zone offsets. return field != null && field.getUnitMillis() < DateTimeConstants.MILLIS_PER_HOUR * 12; } /** * Restricted constructor * * @param base base chronology to wrap * @param zone the time zone */ private ZonedChronology(Chronology base, DateTimeZone zone) { super(base, zone); } public DateTimeZone getZone() { return (DateTimeZone)getParam(); } public Chronology withUTC() { return getBase(); } public Chronology withZone(DateTimeZone zone) { if (zone == null) { zone = DateTimeZone.getDefault(); } if (zone == getParam()) { return this; } if (zone == DateTimeZone.UTC) { return getBase(); } return new ZonedChronology(getBase(), zone); } public long getDateTimeMillis(int year, int monthOfYear, int dayOfMonth, int millisOfDay) throws IllegalArgumentException { return localToUTC(getBase().getDateTimeMillis (year, monthOfYear, dayOfMonth, millisOfDay)); } public long getDateTimeMillis(int year, int monthOfYear, int dayOfMonth, int hourOfDay, int minuteOfHour, int secondOfMinute, int millisOfSecond) throws IllegalArgumentException { return localToUTC(getBase().getDateTimeMillis (year, monthOfYear, dayOfMonth, hourOfDay, minuteOfHour, secondOfMinute, millisOfSecond)); } public long getDateTimeMillis(long instant, int hourOfDay, int minuteOfHour, int secondOfMinute, int millisOfSecond) throws IllegalArgumentException { return localToUTC(getBase().getDateTimeMillis (instant + getZone().getOffset(instant), hourOfDay, minuteOfHour, secondOfMinute, millisOfSecond)); } /** * @param localInstant the instant from 1970-01-01T00:00:00 local time * @return the instant from 1970-01-01T00:00:00Z */ private long localToUTC(long localInstant) { DateTimeZone zone = getZone(); int offset = zone.getOffsetFromLocal(localInstant); localInstant -= offset; if (offset != zone.getOffset(localInstant)) { throw new IllegalInstantException(localInstant, zone.getID()); } return localInstant; } protected void assemble(Fields fields) { // Keep a local cache of converted fields so as not to create redundant // objects. HashMap converted = new HashMap(); // Convert duration fields... fields.eras = convertField(fields.eras, converted); fields.centuries = convertField(fields.centuries, converted); fields.years = convertField(fields.years, converted); fields.months = convertField(fields.months, converted); fields.weekyears = convertField(fields.weekyears, converted); fields.weeks = convertField(fields.weeks, converted); fields.days = convertField(fields.days, converted); fields.halfdays = convertField(fields.halfdays, converted); fields.hours = convertField(fields.hours, converted); fields.minutes = convertField(fields.minutes, converted); fields.seconds = convertField(fields.seconds, converted); fields.millis = convertField(fields.millis, converted); // Convert datetime fields... fields.year = convertField(fields.year, converted); fields.yearOfEra = convertField(fields.yearOfEra, converted); fields.yearOfCentury = convertField(fields.yearOfCentury, converted); fields.centuryOfEra = convertField(fields.centuryOfEra, converted); fields.era = convertField(fields.era, converted); fields.dayOfWeek = convertField(fields.dayOfWeek, converted); fields.dayOfMonth = convertField(fields.dayOfMonth, converted); fields.dayOfYear = convertField(fields.dayOfYear, converted); fields.monthOfYear = convertField(fields.monthOfYear, converted); fields.weekOfWeekyear = convertField(fields.weekOfWeekyear, converted); fields.weekyear = convertField(fields.weekyear, converted); fields.weekyearOfCentury = convertField(fields.weekyearOfCentury, converted); fields.millisOfSecond = convertField(fields.millisOfSecond, converted); fields.millisOfDay = convertField(fields.millisOfDay, converted); fields.secondOfMinute = convertField(fields.secondOfMinute, converted); fields.secondOfDay = convertField(fields.secondOfDay, converted); fields.minuteOfHour = convertField(fields.minuteOfHour, converted); fields.minuteOfDay = convertField(fields.minuteOfDay, converted); fields.hourOfDay = convertField(fields.hourOfDay, converted); fields.hourOfHalfday = convertField(fields.hourOfHalfday, converted); fields.clockhourOfDay = convertField(fields.clockhourOfDay, converted); fields.clockhourOfHalfday = convertField(fields.clockhourOfHalfday, converted); fields.halfdayOfDay = convertField(fields.halfdayOfDay, converted); } private DurationField convertField(DurationField field, HashMap converted) { if (field == null || !field.isSupported()) { return field; } if (converted.containsKey(field)) { return (DurationField)converted.get(field); } ZonedDurationField zonedField = new ZonedDurationField(field, getZone()); converted.put(field, zonedField); return zonedField; } private DateTimeField convertField(DateTimeField field, HashMap converted) { if (field == null || !field.isSupported()) { return field; } if (converted.containsKey(field)) { return (DateTimeField)converted.get(field); } ZonedDateTimeField zonedField = new ZonedDateTimeField(field, getZone(), convertField(field.getDurationField(), converted), convertField(field.getRangeDurationField(), converted), convertField(field.getLeapDurationField(), converted)); converted.put(field, zonedField); return zonedField; } //----------------------------------------------------------------------- /** * A zoned chronology is only equal to a zoned chronology with the * same base chronology and zone. * * @param obj the object to compare to * @return true if equal * @since 1.4 */ public boolean equals(Object obj) { if (this == obj) { return true; } if (obj instanceof ZonedChronology == false) { return false; } ZonedChronology chrono = (ZonedChronology) obj; return getBase().equals(chrono.getBase()) && getZone().equals(chrono.getZone()); } /** * A suitable hashcode for the chronology. * * @return the hashcode * @since 1.4 */ public int hashCode() { return 326565 + getZone().hashCode() * 11 + getBase().hashCode() * 7; } /** * A debugging string for the chronology. * * @return the debugging string */ public String toString() { return "ZonedChronology[" + getBase() + ", " + getZone().getID() + ']'; } //----------------------------------------------------------------------- /* * Because time durations are typically smaller than time zone offsets, the * arithmetic methods subtract the original offset. This produces a more * expected behavior when crossing time zone offset transitions. For dates, * the new offset is subtracted off. This behavior, if applied to time * fields, can nullify or reverse an add when crossing a transition. */ static class ZonedDurationField extends BaseDurationField { private static final long serialVersionUID = -485345310999208286L; final DurationField iField; final boolean iTimeField; final DateTimeZone iZone; ZonedDurationField(DurationField field, DateTimeZone zone) { super(field.getType()); if (!field.isSupported()) { throw new IllegalArgumentException(); } iField = field; iTimeField = useTimeArithmetic(field); iZone = zone; } public boolean isPrecise() { return iTimeField ? iField.isPrecise() : iField.isPrecise() && this.iZone.isFixed(); } public long getUnitMillis() { return iField.getUnitMillis(); } public int getValue(long duration, long instant) { return iField.getValue(duration, addOffset(instant)); } public long getValueAsLong(long duration, long instant) { return iField.getValueAsLong(duration, addOffset(instant)); } public long getMillis(int value, long instant) { return iField.getMillis(value, addOffset(instant)); } public long getMillis(long value, long instant) { return iField.getMillis(value, addOffset(instant)); } public long add(long instant, int value) { int offset = getOffsetToAdd(instant); instant = iField.add(instant + offset, value); return instant - (iTimeField ? offset : getOffsetFromLocalToSubtract(instant)); } public long add(long instant, long value) { int offset = getOffsetToAdd(instant); instant = iField.add(instant + offset, value); return instant - (iTimeField ? offset : getOffsetFromLocalToSubtract(instant)); } public int getDifference(long minuendInstant, long subtrahendInstant) { int offset = getOffsetToAdd(subtrahendInstant); return iField.getDifference (minuendInstant + (iTimeField ? offset : getOffsetToAdd(minuendInstant)), subtrahendInstant + offset); } public long getDifferenceAsLong(long minuendInstant, long subtrahendInstant) { int offset = getOffsetToAdd(subtrahendInstant); return iField.getDifferenceAsLong (minuendInstant + (iTimeField ? offset : getOffsetToAdd(minuendInstant)), subtrahendInstant + offset); } private int getOffsetToAdd(long instant) { int offset = this.iZone.getOffset(instant); long sum = instant + offset; // If there is a sign change, but the two values have the same sign... if ((instant ^ sum) < 0 && (instant ^ offset) >= 0) { throw new ArithmeticException("Adding time zone offset caused overflow"); } return offset; } private int getOffsetFromLocalToSubtract(long instant) { int offset = this.iZone.getOffsetFromLocal(instant); long diff = instant - offset; // If there is a sign change, but the two values have different signs... if ((instant ^ diff) < 0 && (instant ^ offset) < 0) { throw new ArithmeticException("Subtracting time zone offset caused overflow"); } return offset; } private long addOffset(long instant) { return iZone.convertUTCToLocal(instant); } } /** * A DateTimeField that decorates another to add timezone behaviour. *

* This class converts passed in instants to local wall time, and vice * versa on output. */ static final class ZonedDateTimeField extends BaseDateTimeField { private static final long serialVersionUID = -3968986277775529794L; final DateTimeField iField; final DateTimeZone iZone; final DurationField iDurationField; final boolean iTimeField; final DurationField iRangeDurationField; final DurationField iLeapDurationField; ZonedDateTimeField(DateTimeField field, DateTimeZone zone, DurationField durationField, DurationField rangeDurationField, DurationField leapDurationField) { super(field.getType()); if (!field.isSupported()) { throw new IllegalArgumentException(); } iField = field; iZone = zone; iDurationField = durationField; iTimeField = useTimeArithmetic(durationField); iRangeDurationField = rangeDurationField; iLeapDurationField = leapDurationField; } public boolean isLenient() { return iField.isLenient(); } public int get(long instant) { long localInstant = iZone.convertUTCToLocal(instant); return iField.get(localInstant); } public String getAsText(long instant, Locale locale) { long localInstant = iZone.convertUTCToLocal(instant); return iField.getAsText(localInstant, locale); } public String getAsShortText(long instant, Locale locale) { long localInstant = iZone.convertUTCToLocal(instant); return iField.getAsShortText(localInstant, locale); } public String getAsText(int fieldValue, Locale locale) { return iField.getAsText(fieldValue, locale); } public String getAsShortText(int fieldValue, Locale locale) { return iField.getAsShortText(fieldValue, locale); } public long add(long instant, int value) { if (iTimeField) { int offset = getOffsetToAdd(instant); long localInstant = iField.add(instant + offset, value); return localInstant - offset; } else { long localInstant = iZone.convertUTCToLocal(instant); localInstant = iField.add(localInstant, value); return iZone.convertLocalToUTC(localInstant, false, instant); } } public long add(long instant, long value) { if (iTimeField) { int offset = getOffsetToAdd(instant); long localInstant = iField.add(instant + offset, value); return localInstant - offset; } else { long localInstant = iZone.convertUTCToLocal(instant); localInstant = iField.add(localInstant, value); return iZone.convertLocalToUTC(localInstant, false, instant); } } public long addWrapField(long instant, int value) { if (iTimeField) { int offset = getOffsetToAdd(instant); long localInstant = iField.addWrapField(instant + offset, value); return localInstant - offset; } else { long localInstant = iZone.convertUTCToLocal(instant); localInstant = iField.addWrapField(localInstant, value); return iZone.convertLocalToUTC(localInstant, false, instant); } } public long set(long instant, int value) { long localInstant = iZone.convertUTCToLocal(instant); localInstant = iField.set(localInstant, value); long result = iZone.convertLocalToUTC(localInstant, false, instant); if (get(result) != value) { IllegalInstantException cause = new IllegalInstantException(localInstant, iZone.getID()); IllegalFieldValueException ex = new IllegalFieldValueException(iField.getType(), Integer.valueOf(value), cause.getMessage()); ex.initCause(cause); throw ex; } return result; } public long set(long instant, String text, Locale locale) { // cannot verify that new value stuck because set may be lenient long localInstant = iZone.convertUTCToLocal(instant); localInstant = iField.set(localInstant, text, locale); return iZone.convertLocalToUTC(localInstant, false, instant); } public int getDifference(long minuendInstant, long subtrahendInstant) { int offset = getOffsetToAdd(subtrahendInstant); return iField.getDifference (minuendInstant + (iTimeField ? offset : getOffsetToAdd(minuendInstant)), subtrahendInstant + offset); } public long getDifferenceAsLong(long minuendInstant, long subtrahendInstant) { int offset = getOffsetToAdd(subtrahendInstant); return iField.getDifferenceAsLong (minuendInstant + (iTimeField ? offset : getOffsetToAdd(minuendInstant)), subtrahendInstant + offset); } public final DurationField getDurationField() { return iDurationField; } public final DurationField getRangeDurationField() { return iRangeDurationField; } public boolean isLeap(long instant) { long localInstant = iZone.convertUTCToLocal(instant); return iField.isLeap(localInstant); } public int getLeapAmount(long instant) { long localInstant = iZone.convertUTCToLocal(instant); return iField.getLeapAmount(localInstant); } public final DurationField getLeapDurationField() { return iLeapDurationField; } public long roundFloor(long instant) { if (iTimeField) { int offset = getOffsetToAdd(instant); instant = iField.roundFloor(instant + offset); return instant - offset; } else { long localInstant = iZone.convertUTCToLocal(instant); localInstant = iField.roundFloor(localInstant); return iZone.convertLocalToUTC(localInstant, false, instant); } } public long roundCeiling(long instant) { if (iTimeField) { int offset = getOffsetToAdd(instant); instant = iField.roundCeiling(instant + offset); return instant - offset; } else { long localInstant = iZone.convertUTCToLocal(instant); localInstant = iField.roundCeiling(localInstant); return iZone.convertLocalToUTC(localInstant, false, instant); } } public long remainder(long instant) { long localInstant = iZone.convertUTCToLocal(instant); return iField.remainder(localInstant); } public int getMinimumValue() { return iField.getMinimumValue(); } public int getMinimumValue(long instant) { long localInstant = iZone.convertUTCToLocal(instant); return iField.getMinimumValue(localInstant); } public int getMinimumValue(ReadablePartial instant) { return iField.getMinimumValue(instant); } public int getMinimumValue(ReadablePartial instant, int[] values) { return iField.getMinimumValue(instant, values); } public int getMaximumValue() { return iField.getMaximumValue(); } public int getMaximumValue(long instant) { long localInstant = iZone.convertUTCToLocal(instant); return iField.getMaximumValue(localInstant); } public int getMaximumValue(ReadablePartial instant) { return iField.getMaximumValue(instant); } public int getMaximumValue(ReadablePartial instant, int[] values) { return iField.getMaximumValue(instant, values); } public int getMaximumTextLength(Locale locale) { return iField.getMaximumTextLength(locale); } public int getMaximumShortTextLength(Locale locale) { return iField.getMaximumShortTextLength(locale); } private int getOffsetToAdd(long instant) { int offset = this.iZone.getOffset(instant); long sum = instant + offset; // If there is a sign change, but the two values have the same sign... if ((instant ^ sum) < 0 && (instant ^ offset) >= 0) { throw new ArithmeticException("Adding time zone offset caused overflow"); } return offset; } } }





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