org.threeten.extra.Weeks Maven / Gradle / Ivy
Show all versions of threeten-extra Show documentation
/*
* Copyright (c) 2007-present, 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 org.threeten.extra;
import static java.time.temporal.ChronoUnit.WEEKS;
import java.io.Serializable;
import java.time.DateTimeException;
import java.time.Period;
import java.time.format.DateTimeParseException;
import java.time.temporal.ChronoUnit;
import java.time.temporal.Temporal;
import java.time.temporal.TemporalAmount;
import java.time.temporal.TemporalUnit;
import java.time.temporal.UnsupportedTemporalTypeException;
import java.util.Collections;
import java.util.List;
import java.util.Objects;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import org.joda.convert.FromString;
import org.joda.convert.ToString;
/**
* A week-based amount of time, such as '12 weeks'.
*
* This class models a quantity or amount of time in terms of weeks.
* It is a type-safe way of representing a number of weeks in an application.
*
* The model is of a directed amount, meaning that the amount may be negative.
*
*
Implementation Requirements:
* This class is immutable and thread-safe.
*
* This class must be treated as a value type. Do not synchronize, rely on the
* identity hash code or use the distinction between equals() and ==.
*/
public final class Weeks
implements TemporalAmount, Comparable, Serializable {
/**
* A constant for zero weeks.
*/
public static final Weeks ZERO = new Weeks(0);
/**
* A constant for one week.
*/
public static final Weeks ONE = new Weeks(1);
/**
* A serialization identifier for this class.
*/
private static final long serialVersionUID = -8903767091325669093L;
/**
* The pattern for parsing.
*/
private static final Pattern PATTERN =
Pattern.compile("([-+]?)P([-+]?[0-9]+)W", Pattern.CASE_INSENSITIVE);
/**
* The number of weeks.
*/
private final int weeks;
/**
* Obtains a {@code Weeks} representing a number of weeks.
*
* The resulting amount will have the specified weeks.
*
* @param weeks the number of weeks, positive or negative
* @return the number of weeks, not null
*/
public static Weeks of(int weeks) {
if (weeks == 0) {
return ZERO;
} else if (weeks == 1) {
return ONE;
}
return new Weeks(weeks);
}
//-----------------------------------------------------------------------
/**
* Obtains an instance of {@code Weeks} from a temporal amount.
*
* This obtains an instance based on the specified amount.
* A {@code TemporalAmount} represents an amount of time, which may be
* date-based or time-based, which this factory extracts to a {@code Weeks}.
*
* The result is calculated by looping around each unit in the specified amount.
* Each amount is converted to weeks using {@link Temporals#convertAmount}.
* If the conversion yields a remainder, an exception is thrown.
* If the amount is zero, the unit is ignored.
* For example, "7 days" can be converted to weeks but "6 days" cannot.
*
* @param amount the temporal amount to convert, not null
* @return the equivalent amount, not null
* @throws DateTimeException if unable to convert to a {@code Weeks}
* @throws ArithmeticException if numeric overflow occurs
*/
public static Weeks from(TemporalAmount amount) {
if (amount instanceof Weeks) {
return (Weeks) amount;
}
Objects.requireNonNull(amount, "amount");
int weeks = 0;
for (TemporalUnit unit : amount.getUnits()) {
long value = amount.get(unit);
if (value != 0) {
long[] converted = Temporals.convertAmount(value, unit, WEEKS);
if (converted[1] != 0) {
throw new DateTimeException(
"Amount could not be converted to a whole number of weeks: " + value + " " + unit);
}
weeks = Math.addExact(weeks, Math.toIntExact(converted[0]));
}
}
return of(weeks);
}
//-----------------------------------------------------------------------
/**
* Obtains a {@code Weeks} from a text string such as {@code PnW}.
*
* This will parse the string produced by {@code toString()} which is
* based on the ISO-8601 period formats {@code PnW}.
*
* The string starts with an optional sign, denoted by the ASCII negative
* or positive symbol. If negative, the whole amount is negated.
* The ASCII letter "P" is next in upper or lower case.
* The ASCII integer amount is next, which may be negative.
* The ASCII letter "W" is next in upper or lower case.
*
* The leading plus/minus sign, and negative values for weeks are
* not part of the ISO-8601 standard.
*
* For example, the following are valid inputs:
*
* "P2W" -- Weeks.of(2)
* "P-2W" -- Weeks.of(-2)
* "-P2W" -- Weeks.of(-2)
* "-P-2W" -- Weeks.of(2)
*
*
* @param text the text to parse, not null
* @return the parsed period, not null
* @throws DateTimeParseException if the text cannot be parsed to a period
*/
@FromString
public static Weeks parse(CharSequence text) {
Objects.requireNonNull(text, "text");
Matcher matcher = PATTERN.matcher(text);
if (matcher.matches()) {
int negate = "-".equals(matcher.group(1)) ? -1 : 1;
String str = matcher.group(2);
try {
int val = Integer.parseInt(str);
return of(Math.multiplyExact(val, negate));
} catch (NumberFormatException ex) {
throw new DateTimeParseException("Text cannot be parsed to a Weeks", text, 0, ex);
}
}
throw new DateTimeParseException("Text cannot be parsed to a Weeks", text, 0);
}
//-----------------------------------------------------------------------
/**
* Obtains a {@code Weeks} consisting of the number of weeks between two dates.
*
* The start date is included, but the end date is not.
* The result of this method can be negative if the end is before the start.
*
* @param startDateInclusive the start date, inclusive, not null
* @param endDateExclusive the end date, exclusive, not null
* @return the number of weeks between this date and the end date, not null
*/
public static Weeks between(Temporal startDateInclusive, Temporal endDateExclusive) {
return of(Math.toIntExact(WEEKS.between(startDateInclusive, endDateExclusive)));
}
//-----------------------------------------------------------------------
/**
* Constructs an instance using a specific number of weeks.
*
* @param weeks the weeks to use
*/
private Weeks(int weeks) {
super();
this.weeks = weeks;
}
/**
* Resolves singletons.
*
* @return the singleton instance
*/
private Object readResolve() {
return Weeks.of(weeks);
}
//-----------------------------------------------------------------------
/**
* Gets the value of the requested unit.
*
* This returns a value for the supported unit - {@link ChronoUnit#WEEKS WEEKS}.
* All other units throw an exception.
*
* @param unit the {@code TemporalUnit} for which to return the value
* @return the long value of the unit
* @throws UnsupportedTemporalTypeException if the unit is not supported
*/
@Override
public long get(TemporalUnit unit) {
if (unit == WEEKS) {
return weeks;
}
throw new UnsupportedTemporalTypeException("Unsupported unit: " + unit);
}
/**
* Gets the set of units supported by this amount.
*
* The single supported unit is {@link ChronoUnit#WEEKS WEEKS}.
*
* This set can be used in conjunction with {@link #get(TemporalUnit)}
* to access the entire state of the amount.
*
* @return a list containing the weeks unit, not null
*/
@Override
public List getUnits() {
return Collections.singletonList(WEEKS);
}
//-----------------------------------------------------------------------
/**
* Gets the number of weeks in this amount.
*
* @return the number of weeks
*/
public int getAmount() {
return weeks;
}
//-----------------------------------------------------------------------
/**
* Returns a copy of this amount with the specified amount added.
*
* The parameter is converted using {@link Weeks#from(TemporalAmount)}.
*
* This instance is immutable and unaffected by this method call.
*
* @param amountToAdd the amount to add, not null
* @return a {@code Weeks} based on this instance with the requested amount added, not null
* @throws DateTimeException if the specified amount contains an invalid unit
* @throws ArithmeticException if numeric overflow occurs
*/
public Weeks plus(TemporalAmount amountToAdd) {
return plus(Weeks.from(amountToAdd).getAmount());
}
/**
* Returns a copy of this amount with the specified number of weeks added.
*
* This instance is immutable and unaffected by this method call.
*
* @param weeks the amount of weeks to add, may be negative
* @return a {@code Weeks} based on this instance with the requested amount added, not null
* @throws ArithmeticException if the result overflows an int
*/
public Weeks plus(int weeks) {
if (weeks == 0) {
return this;
}
return of(Math.addExact(this.weeks, weeks));
}
//-----------------------------------------------------------------------
/**
* Returns a copy of this amount with the specified amount subtracted.
*
* The parameter is converted using {@link Weeks#from(TemporalAmount)}.
*
* This instance is immutable and unaffected by this method call.
*
* @param amountToAdd the amount to add, not null
* @return a {@code Weeks} based on this instance with the requested amount subtracted, not null
* @throws DateTimeException if the specified amount contains an invalid unit
* @throws ArithmeticException if numeric overflow occurs
*/
public Weeks minus(TemporalAmount amountToAdd) {
return minus(Weeks.from(amountToAdd).getAmount());
}
/**
* Returns a copy of this amount with the specified number of weeks subtracted.
*
* This instance is immutable and unaffected by this method call.
*
* @param weeks the amount of weeks to add, may be negative
* @return a {@code Weeks} based on this instance with the requested amount subtracted, not null
* @throws ArithmeticException if the result overflows an int
*/
public Weeks minus(int weeks) {
if (weeks == 0) {
return this;
}
return of(Math.subtractExact(this.weeks, weeks));
}
//-----------------------------------------------------------------------
/**
* Returns an instance with the amount multiplied by the specified scalar.
*
* This instance is immutable and unaffected by this method call.
*
* @param scalar the scalar to multiply by, not null
* @return the amount multiplied by the specified scalar, not null
* @throws ArithmeticException if numeric overflow occurs
*/
public Weeks multipliedBy(int scalar) {
if (scalar == 1) {
return this;
}
return of(Math.multiplyExact(weeks, scalar));
}
/**
* Returns an instance with the amount divided by the specified divisor.
*
* The calculation uses integer division, thus 3 divided by 2 is 1.
*
* This instance is immutable and unaffected by this method call.
*
* @param divisor the amount to divide by, may be negative
* @return the amount divided by the specified divisor, not null
* @throws ArithmeticException if the divisor is zero
*/
public Weeks dividedBy(int divisor) {
if (divisor == 1) {
return this;
}
return of(weeks / divisor);
}
/**
* Returns an instance with the amount negated.
*
* This instance is immutable and unaffected by this method call.
*
* @return the negated amount, not null
* @throws ArithmeticException if numeric overflow occurs, which only happens if
* the amount is {@code Long.MIN_VALUE}
*/
public Weeks negated() {
return multipliedBy(-1);
}
/**
* Returns a copy of this duration with a positive length.
*
* This method returns a positive duration by effectively removing the sign from any negative total length.
*
* This instance is immutable and unaffected by this method call.
*
* @return the absolute amount, not null
* @throws ArithmeticException if numeric overflow occurs, which only happens if
* the amount is {@code Long.MIN_VALUE}
*/
public Weeks abs() {
return weeks < 0 ? negated() : this;
}
//-------------------------------------------------------------------------
/**
* Gets the number of weeks as a {@code Period}.
*
* This returns a period with the same number of weeks.
*
* @return the equivalent period, not null
*/
public Period toPeriod() {
return Period.ofWeeks(weeks);
}
//-----------------------------------------------------------------------
/**
* Adds this amount to the specified temporal object.
*
* This returns a temporal object of the same observable type as the input
* with this amount added.
*
* In most cases, it is clearer to reverse the calling pattern by using
* {@link Temporal#plus(TemporalAmount)}.
*
* // these two lines are equivalent, but the second approach is recommended
* dateTime = thisAmount.addTo(dateTime);
* dateTime = dateTime.plus(thisAmount);
*
*
* Only non-zero amounts will be added.
*
* This instance is immutable and unaffected by this method call.
*
* @param temporal the temporal object to adjust, not null
* @return an object of the same type with the adjustment made, not null
* @throws DateTimeException if unable to add
* @throws UnsupportedTemporalTypeException if the WEEKS unit is not supported
* @throws ArithmeticException if numeric overflow occurs
*/
@Override
public Temporal addTo(Temporal temporal) {
if (weeks != 0) {
temporal = temporal.plus(weeks, WEEKS);
}
return temporal;
}
/**
* Subtracts this amount from the specified temporal object.
*
* This returns a temporal object of the same observable type as the input
* with this amount subtracted.
*
* In most cases, it is clearer to reverse the calling pattern by using
* {@link Temporal#minus(TemporalAmount)}.
*
* // these two lines are equivalent, but the second approach is recommended
* dateTime = thisAmount.subtractFrom(dateTime);
* dateTime = dateTime.minus(thisAmount);
*
*
* Only non-zero amounts will be subtracted.
*
* This instance is immutable and unaffected by this method call.
*
* @param temporal the temporal object to adjust, not null
* @return an object of the same type with the adjustment made, not null
* @throws DateTimeException if unable to subtract
* @throws UnsupportedTemporalTypeException if the WEEKS unit is not supported
* @throws ArithmeticException if numeric overflow occurs
*/
@Override
public Temporal subtractFrom(Temporal temporal) {
if (weeks != 0) {
temporal = temporal.minus(weeks, WEEKS);
}
return temporal;
}
//-----------------------------------------------------------------------
/**
* Compares this amount to the specified {@code Weeks}.
*
* The comparison is based on the total length of the amounts.
* It is "consistent with equals", as defined by {@link Comparable}.
*
* @param otherAmount the other amount, not null
* @return the comparator value, negative if less, positive if greater
*/
@Override
public int compareTo(Weeks otherAmount) {
int thisValue = this.weeks;
int otherValue = otherAmount.weeks;
return Integer.compare(thisValue, otherValue);
}
//-----------------------------------------------------------------------
/**
* Checks if this amount is equal to the specified {@code Weeks}.
*
* The comparison is based on the total length of the durations.
*
* @param otherAmount the other amount, null returns false
* @return true if the other amount is equal to this one
*/
@Override
public boolean equals(Object otherAmount) {
if (this == otherAmount) {
return true;
}
if (otherAmount instanceof Weeks) {
Weeks other = (Weeks) otherAmount;
return this.weeks == other.weeks;
}
return false;
}
/**
* A hash code for this amount.
*
* @return a suitable hash code
*/
@Override
public int hashCode() {
return weeks;
}
//-----------------------------------------------------------------------
/**
* Returns a string representation of the number of weeks.
* This will be in the format 'PnW' where n is the number of weeks.
*
* @return the number of weeks in ISO-8601 string format
*/
@Override
@ToString
public String toString() {
return "P" + weeks + "W";
}
}