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/*
* Copyright (c) 2013, 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
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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package java.time.chrono;
import static java.time.temporal.ChronoField.MONTH_OF_YEAR;
import static java.time.temporal.ChronoUnit.DAYS;
import static java.time.temporal.ChronoUnit.MONTHS;
import static java.time.temporal.ChronoUnit.YEARS;
import java.io.DataInput;
import java.io.DataOutput;
import java.io.IOException;
import java.io.InvalidObjectException;
import java.io.ObjectInputStream;
import java.io.ObjectStreamException;
import java.io.Serializable;
import java.time.DateTimeException;
import java.time.temporal.ChronoUnit;
import java.time.temporal.Temporal;
import java.time.temporal.TemporalAccessor;
import java.time.temporal.TemporalAmount;
import java.time.temporal.TemporalQueries;
import java.time.temporal.TemporalUnit;
import java.time.temporal.UnsupportedTemporalTypeException;
import java.time.temporal.ValueRange;
import java.util.Arrays;
import java.util.Collections;
import java.util.List;
import java.util.Objects;
/**
* A period expressed in terms of a standard year-month-day calendar system.
* <p>
* This class is used by applications seeking to handle dates in non-ISO calendar systems.
* For example, the Japanese, Minguo, Thai Buddhist and others.
*
* @implSpec
* This class is immutable nad thread-safe.
*
* @since 1.8
*/
final class ChronoPeriodImpl
implements ChronoPeriod, Serializable {
// this class is only used by JDK chronology implementations and makes assumptions based on that fact
/**
* Serialization version.
*/
private static final long serialVersionUID = 57387258289L;
/**
* The set of supported units.
*/
private static final List<TemporalUnit> SUPPORTED_UNITS =
Collections.unmodifiableList(Arrays.<TemporalUnit>asList(YEARS, MONTHS, DAYS));
/**
* The chronology.
*/
private final Chronology chrono;
/**
* The number of years.
*/
final int years;
/**
* The number of months.
*/
final int months;
/**
* The number of days.
*/
final int days;
/**
* Creates an instance.
*/
ChronoPeriodImpl(Chronology chrono, int years, int months, int days) {
Objects.requireNonNull(chrono, "chrono");
this.chrono = chrono;
this.years = years;
this.months = months;
this.days = days;
}
//-----------------------------------------------------------------------
@Override
public long get(TemporalUnit unit) {
if (unit == ChronoUnit.YEARS) {
return years;
} else if (unit == ChronoUnit.MONTHS) {
return months;
} else if (unit == ChronoUnit.DAYS) {
return days;
} else {
throw new UnsupportedTemporalTypeException("Unsupported unit: " + unit);
}
}
@Override
public List<TemporalUnit> getUnits() {
return ChronoPeriodImpl.SUPPORTED_UNITS;
}
@Override
public Chronology getChronology() {
return chrono;
}
//-----------------------------------------------------------------------
@Override
public boolean isZero() {
return years == 0 && months == 0 && days == 0;
}
@Override
public boolean isNegative() {
return years < 0 || months < 0 || days < 0;
}
//-----------------------------------------------------------------------
@Override
public ChronoPeriod plus(TemporalAmount amountToAdd) {
ChronoPeriodImpl amount = validateAmount(amountToAdd);
return new ChronoPeriodImpl(
chrono,
Math.addExact(years, amount.years),
Math.addExact(months, amount.months),
Math.addExact(days, amount.days));
}
@Override
public ChronoPeriod minus(TemporalAmount amountToSubtract) {
ChronoPeriodImpl amount = validateAmount(amountToSubtract);
return new ChronoPeriodImpl(
chrono,
Math.subtractExact(years, amount.years),
Math.subtractExact(months, amount.months),
Math.subtractExact(days, amount.days));
}
/**
* Obtains an instance of {@code ChronoPeriodImpl} from a temporal amount.
*
* @param amount the temporal amount to convert, not null
* @return the period, not null
*/
private ChronoPeriodImpl validateAmount(TemporalAmount amount) {
Objects.requireNonNull(amount, "amount");
if (amount instanceof ChronoPeriodImpl == false) {
throw new DateTimeException("Unable to obtain ChronoPeriod from TemporalAmount: " + amount.getClass());
}
ChronoPeriodImpl period = (ChronoPeriodImpl) amount;
if (chrono.equals(period.getChronology()) == false) {
throw new ClassCastException("Chronology mismatch, expected: " + chrono.getId() + ", actual: " + period.getChronology().getId());
}
return period;
}
//-----------------------------------------------------------------------
@Override
public ChronoPeriod multipliedBy(int scalar) {
if (this.isZero() || scalar == 1) {
return this;
}
return new ChronoPeriodImpl(
chrono,
Math.multiplyExact(years, scalar),
Math.multiplyExact(months, scalar),
Math.multiplyExact(days, scalar));
}
//-----------------------------------------------------------------------
@Override
public ChronoPeriod normalized() {
long monthRange = monthRange();
if (monthRange > 0) {
long totalMonths = years * monthRange + months;
long splitYears = totalMonths / monthRange;
int splitMonths = (int) (totalMonths % monthRange); // no overflow
if (splitYears == years && splitMonths == months) {
return this;
}
return new ChronoPeriodImpl(chrono, Math.toIntExact(splitYears), splitMonths, days);
}
return this;
}
/**
* Calculates the range of months.
*
* @return the month range, -1 if not fixed range
*/
private long monthRange() {
ValueRange startRange = chrono.range(MONTH_OF_YEAR);
if (startRange.isFixed() && startRange.isIntValue()) {
return startRange.getMaximum() - startRange.getMinimum() + 1;
}
return -1;
}
//-------------------------------------------------------------------------
@Override
public Temporal addTo(Temporal temporal) {
validateChrono(temporal);
if (months == 0) {
if (years != 0) {
temporal = temporal.plus(years, YEARS);
}
} else {
long monthRange = monthRange();
if (monthRange > 0) {
temporal = temporal.plus(years * monthRange + months, MONTHS);
} else {
if (years != 0) {
temporal = temporal.plus(years, YEARS);
}
temporal = temporal.plus(months, MONTHS);
}
}
if (days != 0) {
temporal = temporal.plus(days, DAYS);
}
return temporal;
}
@Override
public Temporal subtractFrom(Temporal temporal) {
validateChrono(temporal);
if (months == 0) {
if (years != 0) {
temporal = temporal.minus(years, YEARS);
}
} else {
long monthRange = monthRange();
if (monthRange > 0) {
temporal = temporal.minus(years * monthRange + months, MONTHS);
} else {
if (years != 0) {
temporal = temporal.minus(years, YEARS);
}
temporal = temporal.minus(months, MONTHS);
}
}
if (days != 0) {
temporal = temporal.minus(days, DAYS);
}
return temporal;
}
/**
* Validates that the temporal has the correct chronology.
*/
private void validateChrono(TemporalAccessor temporal) {
Objects.requireNonNull(temporal, "temporal");
Chronology temporalChrono = temporal.query(TemporalQueries.chronology());
if (temporalChrono != null && chrono.equals(temporalChrono) == false) {
throw new DateTimeException("Chronology mismatch, expected: " + chrono.getId() + ", actual: " + temporalChrono.getId());
}
}
//-----------------------------------------------------------------------
@Override
public boolean equals(Object obj) {
if (this == obj) {
return true;
}
if (obj instanceof ChronoPeriodImpl) {
ChronoPeriodImpl other = (ChronoPeriodImpl) obj;
return years == other.years && months == other.months &&
days == other.days && chrono.equals(other.chrono);
}
return false;
}
@Override
public int hashCode() {
return (years + Integer.rotateLeft(months, 8) + Integer.rotateLeft(days, 16)) ^ chrono.hashCode();
}
//-----------------------------------------------------------------------
@Override
public String toString() {
if (isZero()) {
return getChronology().toString() + " P0D";
} else {
StringBuilder buf = new StringBuilder();
buf.append(getChronology().toString()).append(' ').append('P');
if (years != 0) {
buf.append(years).append('Y');
}
if (months != 0) {
buf.append(months).append('M');
}
if (days != 0) {
buf.append(days).append('D');
}
return buf.toString();
}
}
//-----------------------------------------------------------------------
/**
* Writes the Chronology using a
* <a href="../../../serialized-form.html#java.time.chrono.Ser">dedicated serialized form</a>.
* <pre>
* out.writeByte(12); // identifies this as a ChronoPeriodImpl
* out.writeUTF(getId()); // the chronology
* out.writeInt(years);
* out.writeInt(months);
* out.writeInt(days);
* </pre>
*
* @return the instance of {@code Ser}, not null
*/
protected Object writeReplace() {
return new Ser(Ser.CHRONO_PERIOD_TYPE, this);
}
/**
* Defend against malicious streams.
*
* @param s the stream to read
* @throws InvalidObjectException always
*/
private void readObject(ObjectInputStream s) throws ObjectStreamException {
throw new InvalidObjectException("Deserialization via serialization delegate");
}
void writeExternal(DataOutput out) throws IOException {
out.writeUTF(chrono.getId());
out.writeInt(years);
out.writeInt(months);
out.writeInt(days);
}
static ChronoPeriodImpl readExternal(DataInput in) throws IOException {
Chronology chrono = Chronology.of(in.readUTF());
int years = in.readInt();
int months = in.readInt();
int days = in.readInt();
return new ChronoPeriodImpl(chrono, years, months, days);
}
}