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/* This file is based on code copied from project OneBusAway, see the LICENSE file for further information. */
package org.opentripplanner.model.calendar;
import java.io.Serializable;
import java.text.DecimalFormat;
import java.text.NumberFormat;
import java.text.ParseException;
import java.time.LocalDate;
import java.util.Calendar;
import java.util.Date;
import java.util.TimeZone;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
/**
* A general representation of a year-month-day triple not tied to any locale and
* used by the GTFS entities {@link ServiceCalendar} and
* {@link ServiceCalendarDate} to represent service date ranges.
*
* A service date is a particular date when a particular GTFS service id is active.
*
* This class is immutable. It is a ValueObject(DesignPattern).
*/
public final class ServiceDate implements Serializable, Comparable {
private static final long serialVersionUID = 1L;
private static final Pattern PATTERN = Pattern.compile("^(\\d{4})-?(\\d{2})-?(\\d{2})$");
private static final NumberFormat YEAR_FORMAT = new DecimalFormat("0000");
private static final NumberFormat MONTH_AND_DAY_FORMAT = new DecimalFormat("00");
private static final TimeZone UTC_TIME_ZONE = TimeZone.getTimeZone("UTC");
/**
* The smallest possible ServiceDate allowed. Dates before 1 . JAN year 0 is not allowed.
*/
public static final ServiceDate MIN_DATE = new ServiceDate(0, 1, 1);
/**
* The greatest possible ServiceDate allowed. Dates ater 31 . DEC year 9999 is not allowed.
*/
public static final ServiceDate MAX_DATE = new ServiceDate(9999, 12, 31);
private final int year;
private final int month;
private final int day;
/**
* A uniq increasing number for any valid day between 0000-01-01 and 9999-12-31.
* Holes in the sequence is allowed to simplify the calculation. This is used for
* easy and fast caparison and as a hash for this instant.
*
* The value can safely be used for comparison, equals and hashCode.
*/
private final int sequenceNumber;
/**
* Construct a new ServiceDate by specifying the numeric year, month, and day.
*
* The date must be a valid date between year 1900-01-01 and 9999-12-31.
*
* @param year - numeric year (ex. 2010)
* @param month - numeric month of the year, where Jan = 1, Feb = 2, etc
* @param day - numeric day of month between 1 and 31.
*/
public ServiceDate(int year, int month, int day) {
// Preconditions
verifyIsInRange(year, 0, 9999, "year");
verifyIsInRange(month, 1, 12, "month");
verifyIsInRange(day, 1, 31, "day");
this.year = year;
this.month = month;
this.day = day;
// The sequence number is constructed to be 'yyyymmdd' (a valid integer)
this.sequenceNumber = 10_000 * year + 100 * month + day;
}
public ServiceDate(Calendar calendar) {
this(
calendar.get(Calendar.YEAR),
calendar.get(Calendar.MONTH) + 1,
calendar.get(Calendar.DAY_OF_MONTH)
);
}
/**
* Construct a ServiceDate from the specified {@link Date} object, using the
* default {@link TimeZone} object for the current VM to localize the date
*/
public ServiceDate(Date date) {
this(getCalendarForDate(date));
}
public ServiceDate() {
this(new Date());
}
public ServiceDate(LocalDate date) {
this(date.getYear(), date.getMonthValue(), date.getDayOfMonth());
}
/**
* Parse a service date from a string in "YYYYMMDD" format.
*
* @param value a string of the form "YYYYMMDD"
* @return a new ServiceDate object
* @throws ParseException on parse error
*/
public static ServiceDate parseString(String value) throws ParseException {
Matcher matcher = PATTERN.matcher(value);
if (!matcher.matches())
throw new ParseException("error parsing date: " + value, 0);
int year = Integer.parseInt(matcher.group(1));
int month = Integer.parseInt(matcher.group(2));
int day = Integer.parseInt(matcher.group(3));
return new ServiceDate(year, month, day);
}
public int getYear() {
return year;
}
public int getMonth() {
return month;
}
public int getDay() {
return day;
}
/**
* @return calls {@link #getAsDate(TimeZone)} with the default timezone for
* this VM
*/
public Date getAsDate() {
return getAsDate(TimeZone.getDefault());
}
/**
* Constructs a {@link Calendar} object such that the Calendar will be at
* "midnight" (12:00am) at the start of the day specified by this service date
* and the target timezone. Note that we take the GTFS convention of
* calculating midnight by setting the target date to noon (12:00pm) for the
* service date and timezone specified and then subtracting twelve hours.
* Normally that would be equivalent to midnight, except on Daylight Saving
* Time days, in which case it can be an hour ahead or behind. This behavior
* ensures correct calculation of {@link org.opentripplanner.model.StopTime}
* arrival and departure time when the second offset is added to the localized
* service date.
*
* @param timeZone the target timezone to localize the service date to
* @return a localized date at "midnight" at the start of this service date in
* the specified timezone
*/
public Calendar getAsCalendar(TimeZone timeZone) {
Calendar c = Calendar.getInstance();
c.setTimeZone(timeZone);
c.set(Calendar.YEAR, year);
c.set(Calendar.MONTH, month - 1);
c.set(Calendar.DAY_OF_MONTH, day);
moveCalendarToServiceDate(c);
return c;
}
/**
* See {@link #getAsCalendar(TimeZone)} for more details.
*
* @param timeZone the target timezone to localize the service date to
* @return a localized date at "midnight" at the start of this service date in
* the specified timezone
*/
public Date getAsDate(TimeZone timeZone) {
Calendar c = getAsCalendar(timeZone);
return c.getTime();
}
/**
* @return a string in "YYYYMMDD" format
*/
public String asCompactString() {
String year = YEAR_FORMAT.format(this.year);
String month = MONTH_AND_DAY_FORMAT.format(this.month);
String day = MONTH_AND_DAY_FORMAT.format(this.day);
return year + month + day;
}
public String asISO8601() {
return String.format("%d-%02d-%02d", year, month, day);
}
/**
*
* @return the service date following the current service date
*/
public ServiceDate next() {
return shift(1);
}
/**
*
* @return the service date preceding the current service date
*/
public ServiceDate previous() {
return shift(-1);
}
/**
*
* @param numberOfDays
* @return the service date following the current service date by the
* specified number of days, or preceding if a negative number of days
* is specified
*/
public ServiceDate shift(int numberOfDays) {
Calendar c = getAsCalendar(UTC_TIME_ZONE);
c.add(Calendar.DAY_OF_YEAR, numberOfDays);
return new ServiceDate(c);
}
/**
* @param serviceDate
* @return the number of days between this service date and the specified
* argument service date
*/
public long difference(ServiceDate serviceDate) {
return (serviceDate.getAsDate(UTC_TIME_ZONE).getTime() - getAsDate(UTC_TIME_ZONE).getTime())
/ (24 * 60 * 60 * 1000);
}
/**
* The service date is either the minimum or maximum allowed value.
* In practice this means unbounded.
* */
public boolean isMinMax() {
return equals(MIN_DATE) || equals(MAX_DATE);
}
public boolean isBefore(ServiceDate other) {
return sequenceNumber < other.sequenceNumber;
}
public boolean isBeforeOrEq(ServiceDate other) {
return sequenceNumber <= other.sequenceNumber;
}
public boolean isAfter(ServiceDate other) {
return sequenceNumber > other.sequenceNumber;
}
public boolean isAfterOrEq(ServiceDate other) {
return sequenceNumber >= other.sequenceNumber;
}
public ServiceDate min(ServiceDate other) {
return isBefore(other) ? this : other;
}
public ServiceDate max(ServiceDate other) {
return isAfter(other) ? this : other;
}
@Override
public int compareTo(ServiceDate o) {
return sequenceNumber - o.sequenceNumber;
}
@Override
public String toString() {
if(MAX_DATE.equals(this)) { return "MAX"; }
if(MIN_DATE.equals(this)) { return "MIN"; }
return asISO8601();
}
@Override
public int hashCode() {
return sequenceNumber;
}
@Override
public boolean equals(Object obj) {
if (this == obj) { return true; }
if (obj == null) { return false; }
if (getClass() != obj.getClass()) { return false; }
ServiceDate other = (ServiceDate) obj;
return sequenceNumber == other.sequenceNumber;
}
/**
* Adjust the supplied {@link Calendar} object such that the calendar will be
* at "midnight" (12:00am) at the start of the day specified by the current
* calendar date and locale. Note that we take the GTFS convention of
* calculating midnight by setting the target date to noon (12:00pm) for the
* service date and timezone specified and then subtracting twelve hours.
* Normally that would be equivalent to midnight, except on Daylight Saving
* Time days, in which case it can be an hour ahead or behind. This behavior
* ensures correct calculation of {@link org.opentripplanner.model.StopTime}
* arrival and departure time when the second offset is added to the localized
* service date.
*
* @param c the target calendar, already to some time on the target date
*/
public static void moveCalendarToServiceDate(Calendar c) {
// Initial set time to noon
c.set(Calendar.HOUR_OF_DAY, 12);
c.set(Calendar.MINUTE, 0);
c.set(Calendar.SECOND, 0);
c.set(Calendar.MILLISECOND, 0);
// Subtract 12 hours. Usually takes you to midnight, except on DST days
c.add(Calendar.HOUR_OF_DAY, -12);
}
/* Private Methods */
private static Calendar getCalendarForDate(Date date) {
Calendar c = Calendar.getInstance();
c.setTime(date);
return c;
}
private static void verifyIsInRange(int v, int min, int max, String name) {
if(v < min || v > max) {
throw new IllegalArgumentException(
"The ServiceDate " + name + " is not valid. The value " + v
+ " is not in range [" + min + ", " + max + "]."
);
}
}
}
