Hours.java
/*
* Copyright (c) 2007-present, Stephen Colebourne & Michael Nascimento Santos
*
* All rights reserved.
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* modification, are permitted provided that the following conditions are met:
*
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* 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
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*
* * 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.
*
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package org.threeten.extra;
import static java.time.temporal.ChronoUnit.HOURS;
import java.io.Serializable;
import java.time.DateTimeException;
import java.time.Duration;
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 hour-based amount of time, such as '4 hours'.
* <p>
* This class models a quantity or amount of time in terms of hours.
* It is a type-safe way of representing a number of hours in an application.
* <p>
* The model is of a directed amount, meaning that the amount may be negative.
*
* <h3>Implementation Requirements:</h3>
* This class is immutable and thread-safe.
* <p>
* 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 Hours
implements TemporalAmount, Comparable<Hours>, Serializable {
/**
* A constant for zero hours.
*/
public static final Hours ZERO = new Hours(0);
/**
* A serialization identifier for this class.
*/
private static final long serialVersionUID = -8494096666041369608L;
/**
* The number of hours per day.
*/
private static final int HOURS_PER_DAY = 24;
/**
* The pattern for parsing.
*/
private static final Pattern PATTERN =
Pattern.compile("([-+]?)P"
+ "(?:([-+]?[0-9]+)D)?"
+ "(?:T"
+ "(?:([-+]?[0-9]+)H)?)?", Pattern.CASE_INSENSITIVE);
/**
* The number of hours.
*/
private final int hours;
/**
* Obtains an {@code Hours} representing a number of hours.
* <p>
* The resulting amount will have the specified hours.
*
* @param hours the number of hours, positive or negative
* @return the number of hours, not null
*/
public static Hours of(int hours) {
if (hours == 0) {
return ZERO;
} else {
return new Hours(hours);
}
}
//-----------------------------------------------------------------------
/**
* Obtains an instance of {@code Hours} from a temporal amount.
* <p>
* 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 Hours}.
* <p>
* The result is calculated by looping around each unit in the specified amount.
* Each amount is converted to hours using {@link Temporals#convertAmount}.
* If the conversion yields a remainder, an exception is thrown.
* If the amount is zero, the unit is ignored.
*
* @param amount the temporal amount to convert, not null
* @return the equivalent amount, not null
* @throws DateTimeException if unable to convert to a {@code Hours}
* @throws ArithmeticException if numeric overflow occurs
*/
public static Hours from(TemporalAmount amount) {
if (amount instanceof Hours) {
return (Hours) amount;
}
Objects.requireNonNull(amount, "amount");
int hours = 0;
for (TemporalUnit unit : amount.getUnits()) {
long value = amount.get(unit);
if (value != 0) {
long[] converted = Temporals.convertAmount(value, unit, HOURS);
if (converted[1] != 0) {
throw new DateTimeException(
"Amount could not be converted to a whole number of hours: " + value + " " + unit);
}
hours = Math.addExact(hours, Math.toIntExact(converted[0]));
}
}
return of(hours);
}
//-----------------------------------------------------------------------
/**
* Obtains a {@code Hours} from a text string such as {@code PTnH}.
* <p>
* This will parse the string produced by {@code toString()} and other
* related formats based on ISO-8601 {@code PnDTnH}.
* <p>
* 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.
* There are two sections consisting of a number and a suffix.
* There is one section for days suffixed by "D",
* followed by one section for hours suffixed by "H".
* At least one section must be present.
* If the hours section is present it must be prefixed by "T".
* If the hours section is omitted the "T" must be omitted.
* Letters must be in ASCII upper or lower case.
* The number part of each section must consist of ASCII digits.
* The number may be prefixed by the ASCII negative or positive symbol.
* The number must parse to an {@code int}.
* <p>
* The leading plus/minus sign, and negative values for days and hours
* are not part of the ISO-8601 standard.
* <p>
* For example, the following are valid inputs:
* <pre>
* "PT2H" -- Hours.of(2)
* "PT-HM" -- Hours.of(-2)
* "-PT2H" -- Hours.of(-2)
* "-PT-2H" -- Hours.of(2)
* "P3D" -- Hours.of(3 * 24)
* "P3DT2H" -- Hours.of(3 * 24 + 2)
* </pre>
*
* @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 Hours parse(CharSequence text) {
Objects.requireNonNull(text, "text");
Matcher matcher = PATTERN.matcher(text);
if (matcher.matches()) {
int negate = "-".equals(matcher.group(1)) ? -1 : 1;
String daysStr = matcher.group(2);
String hoursStr = matcher.group(3);
if (daysStr != null || hoursStr != null) {
int hours = 0;
if (hoursStr != null) {
try {
hours = Integer.parseInt(hoursStr);
} catch (NumberFormatException ex) {
throw new DateTimeParseException("Text cannot be parsed to Hours, non-numeric hours", text, 0, ex);
}
}
if (daysStr != null) {
try {
int daysAsHours = Math.multiplyExact(Integer.parseInt(daysStr), HOURS_PER_DAY);
hours = Math.addExact(hours, daysAsHours);
} catch (NumberFormatException ex) {
throw new DateTimeParseException("Text cannot be parsed to Hours, non-numeric days", text, 0, ex);
}
}
return of(Math.multiplyExact(hours, negate));
}
}
throw new DateTimeParseException("Text cannot be parsed to Hours", text, 0);
}
//-----------------------------------------------------------------------
/**
* Obtains a {@code Hours} consisting of the number of hours between two temporals.
* <p>
* The start temporal is included, but the end temporal is not.
* The result of this method can be negative if the end is before the start.
*
* @param startInclusive the start temporal, inclusive, not null
* @param endExclusive the end temporal, exclusive, not null
* @return the number of hours between the start and end temporals, not null
*/
public static Hours between(Temporal startInclusive, Temporal endExclusive) {
return of(Math.toIntExact(HOURS.between(startInclusive, endExclusive)));
}
//-----------------------------------------------------------------------
/**
* Constructs an instance using a specific number of hours.
*
* @param hours the amount of hours
*/
private Hours(int hours) {
this.hours = hours;
}
/**
* Resolves singletons.
*
* @return the singleton instance
*/
private Object readResolve() {
return Hours.of(hours);
}
//-----------------------------------------------------------------------
/**
* Gets the value of the requested unit.
* <p>
* This returns a value for the supported unit - {@link ChronoUnit#HOURS HOURS}.
* 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 == HOURS) {
return hours;
}
throw new UnsupportedTemporalTypeException("Unsupported unit: " + unit);
}
/**
* Gets the set of units supported by this amount.
* <p>
* The single supported unit is {@link ChronoUnit#HOURS HOURS}.
* <p>
* This set can be used in conjunction with {@link #get(TemporalUnit)} to
* access the entire state of the amount.
*
* @return a list containing the hours unit, not null
*/
@Override
public List<TemporalUnit> getUnits() {
return Collections.singletonList(HOURS);
}
//-----------------------------------------------------------------------
/**
* Gets the number of hours in this amount.
*
* @return the number of hours
*/
public int getAmount() {
return hours;
}
/**
* Checks if the amount is negative.
*
* @return true if the amount is negative, false if the amount is zero or positive
*/
public boolean isNegative() {
return getAmount() < 0;
}
/**
* Checks if the amount is zero.
*
* @return true if the amount is zero, false if not
*/
public boolean isZero() {
return getAmount() == 0;
}
/**
* Checks if the amount is positive.
*
* @return true if the amount is positive, false if the amount is zero or negative
*/
public boolean isPositive() {
return getAmount() > 0;
}
//-----------------------------------------------------------------------
/**
* Returns a copy of this amount with the specified amount added.
* <p>
* The parameter is converted using {@link Hours#from(TemporalAmount)}.
* <p>
* This instance is immutable and unaffected by this method call.
*
* @param amountToAdd the amount to add, not null
* @return a {@code Hours} 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 Hours plus(TemporalAmount amountToAdd) {
return plus(Hours.from(amountToAdd).getAmount());
}
/**
* Returns a copy of this amount with the specified number of hours added.
* <p>
* This instance is immutable and unaffected by this method call.
*
* @param hours the amount of hours to add, may be negative
* @return a {@code Hours} based on this instance with the requested amount added, not null
* @throws ArithmeticException if the result overflows an int
*/
public Hours plus(int hours) {
if (hours == 0) {
return this;
}
return of(Math.addExact(this.hours, hours));
}
//-----------------------------------------------------------------------
/**
* Returns a copy of this amount with the specified amount subtracted.
* <p>
* The parameter is converted using {@link Hours#from(TemporalAmount)}.
* <p>
* This instance is immutable and unaffected by this method call.
*
* @param amountToSubtract the amount to subtract, not null
* @return a {@code Hours} 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 Hours minus(TemporalAmount amountToSubtract) {
return minus(Hours.from(amountToSubtract).getAmount());
}
/**
* Returns a copy of this amount with the specified number of hours subtracted.
* <p>
* This instance is immutable and unaffected by this method call.
*
* @param hours the amount of hours to add, may be negative
* @return a {@code Hours} based on this instance with the requested amount subtracted, not null
* @throws ArithmeticException if the result overflows an int
*/
public Hours minus(int hours) {
if (hours == 0) {
return this;
}
return of(Math.subtractExact(this.hours, hours));
}
//-----------------------------------------------------------------------
/**
* Returns an instance with the amount multiplied by the specified scalar.
* <p>
* 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 Hours multipliedBy(int scalar) {
if (scalar == 1) {
return this;
}
return of(Math.multiplyExact(hours, scalar));
}
/**
* Returns an instance with the amount divided by the specified divisor.
* <p>
* The calculation uses integer division, thus 3 divided by 2 is 1.
* <p>
* 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 Hours dividedBy(int divisor) {
if (divisor == 1) {
return this;
}
return of(hours / divisor);
}
/**
* Returns an instance with the amount negated.
* <p>
* 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 Hours negated() {
return multipliedBy(-1);
}
/**
* Returns a copy of this duration with a positive length.
* <p>
* This method returns a positive duration by effectively removing the sign from any negative total length.
* <p>
* 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 Hours abs() {
return hours < 0 ? negated() : this;
}
//-------------------------------------------------------------------------
/**
* Gets the number of hours as a {@code Duration}.
* <p>
* This returns a duration with the same number of hours.
*
* @return the equivalent duration, not null
* @deprecated Use {@link #toDuration()}
*/
@Deprecated
public Duration toPeriod() {
return Duration.ofHours(hours);
}
//-------------------------------------------------------------------------
/**
* Gets the number of hours as a {@code Duration}.
* <p>
* This returns a duration with the same number of hours.
*
* @return the equivalent duration, not null
*/
public Duration toDuration() {
return Duration.ofHours(hours);
}
//-----------------------------------------------------------------------
/**
* Adds this amount to the specified temporal object.
* <p>
* This returns a temporal object of the same observable type as the input
* with this amount added.
* <p>
* In most cases, it is clearer to reverse the calling pattern by using
* {@link Temporal#plus(TemporalAmount)}.
* <pre>
* // these two lines are equivalent, but the second approach is recommended
* dateTime = thisAmount.addTo(dateTime);
* dateTime = dateTime.plus(thisAmount);
* </pre>
* <p>
* Only non-zero amounts will be added.
* <p>
* 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 HOURS unit is not supported
* @throws ArithmeticException if numeric overflow occurs
*/
@Override
public Temporal addTo(Temporal temporal) {
if (hours != 0) {
temporal = temporal.plus(hours, HOURS);
}
return temporal;
}
/**
* Subtracts this amount from the specified temporal object.
* <p>
* This returns a temporal object of the same observable type as the input
* with this amount subtracted.
* <p>
* In most cases, it is clearer to reverse the calling pattern by using
* {@link Temporal#minus(TemporalAmount)}.
* <pre>
* // these two lines are equivalent, but the second approach is recommended
* dateTime = thisAmount.subtractFrom(dateTime);
* dateTime = dateTime.minus(thisAmount);
* </pre>
* <p>
* Only non-zero amounts will be subtracted.
* <p>
* 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 HOURS unit is not supported
* @throws ArithmeticException if numeric overflow occurs
*/
@Override
public Temporal subtractFrom(Temporal temporal) {
if (hours != 0) {
temporal = temporal.minus(hours, HOURS);
}
return temporal;
}
//-----------------------------------------------------------------------
/**
* Compares this amount to the specified {@code Hours}.
* <p>
* 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(Hours otherAmount) {
int thisValue = this.hours;
int otherValue = otherAmount.hours;
return Integer.compare(thisValue, otherValue);
}
//-----------------------------------------------------------------------
/**
* Checks if this amount is equal to the specified {@code Hours}.
* <p>
* 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 Hours) {
Hours other = (Hours) otherAmount;
return this.hours == other.hours;
}
return false;
}
/**
* A hash code for this amount.
*
* @return a suitable hash code
*/
@Override
public int hashCode() {
return hours;
}
//-----------------------------------------------------------------------
/**
* Returns a string representation of the number of hours.
* This will be in the format 'PTnH' where n is the number of hours.
*
* @return the number of hours in ISO-8601 string format
*/
@Override
@ToString
public String toString() {
return "PT" + hours + "H";
}
}