org.jfree.data.time.Second Maven / Gradle / Ivy
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/* ===========================================================
* JFreeChart : a free chart library for the Java(tm) platform
* ===========================================================
*
* (C) Copyright 2000-2020, by Object Refinery Limited and Contributors.
*
* Project Info: http://www.jfree.org/jfreechart/index.html
*
* This library is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation; either version 2.1 of the License, or
* (at your option) any later version.
*
* This library is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
* License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
* USA.
*
* [Oracle and Java are registered trademarks of Oracle and/or its affiliates.
* Other names may be trademarks of their respective owners.]
*
* -----------
* Second.java
* -----------
* (C) Copyright 2001-2020, by Object Refinery Limited.
*
* Original Author: David Gilbert (for Object Refinery Limited);
* Contributor(s): -;
*
*/
package org.jfree.data.time;
import java.io.Serializable;
import java.util.Calendar;
import java.util.Date;
import java.util.Locale;
import java.util.TimeZone;
import org.jfree.chart.util.Args;
/**
* Represents a second in a particular day. This class is immutable, which is
* a requirement for all {@link RegularTimePeriod} subclasses.
*/
public class Second extends RegularTimePeriod implements Serializable {
/** For serialization. */
private static final long serialVersionUID = -6536564190712383466L;
/** Useful constant for the first second in a minute. */
public static final int FIRST_SECOND_IN_MINUTE = 0;
/** Useful constant for the last second in a minute. */
public static final int LAST_SECOND_IN_MINUTE = 59;
/** The day. */
private Day day;
/** The hour of the day. */
private byte hour;
/** The minute. */
private byte minute;
/** The second. */
private byte second;
/**
* The first millisecond. We don't store the last millisecond, because it
* is always firstMillisecond + 999L.
*/
private long firstMillisecond;
/**
* Constructs a new Second, based on the system date/time.
* The time zone and locale are determined by the calendar
* returned by {@link RegularTimePeriod#getCalendarInstance()}.
*/
public Second() {
this(new Date());
}
/**
* Constructs a new Second.
* The time zone and locale are determined by the calendar
* returned by {@link RegularTimePeriod#getCalendarInstance()}.
*
* @param second the second (0 to 59).
* @param minute the minute ({@code null} not permitted).
*/
public Second(int second, Minute minute) {
Args.requireInRange(second, "second",
Second.FIRST_SECOND_IN_MINUTE, Second.LAST_SECOND_IN_MINUTE);
Args.nullNotPermitted(minute, "minute");
this.day = minute.getDay();
this.hour = (byte) minute.getHourValue();
this.minute = (byte) minute.getMinute();
this.second = (byte) second;
peg(getCalendarInstance());
}
/**
* Creates a new second.
* The time zone and locale are determined by the calendar
* returned by {@link RegularTimePeriod#getCalendarInstance()}.
*
* @param second the second (0-59).
* @param minute the minute (0-59).
* @param hour the hour (0-23).
* @param day the day (1-31).
* @param month the month (1-12).
* @param year the year (1900-9999).
*/
public Second(int second, int minute, int hour,
int day, int month, int year) {
this(second, new Minute(minute, hour, day, month, year));
}
/**
* Constructs a new instance from the specified date/time.
* The time zone and locale are determined by the calendar
* returned by {@link RegularTimePeriod#getCalendarInstance()}.
*
* @param time the time ({@code null} not permitted).
*
* @see #Second(Date, TimeZone, Locale)
*/
public Second(Date time) {
this(time, getCalendarInstance());
}
/**
* Creates a new second based on the supplied time and time zone.
*
* @param time the time ({@code null} not permitted).
* @param zone the time zone ({@code null} not permitted).
* @param locale the locale ({@code null} not permitted).
*
* @since 1.0.13
*/
public Second(Date time, TimeZone zone, Locale locale) {
this(time, Calendar.getInstance(zone, locale));
}
/**
* Constructs a new instance, based on a particular date/time.
* The time zone and locale are determined by the {@code calendar}
* parameter.
*
* @param time the date/time ({@code null} not permitted).
* @param calendar the calendar to use for calculations ({@code null} not permitted).
*/
public Second(Date time, Calendar calendar) {
calendar.setTime(time);
this.second = (byte) calendar.get(Calendar.SECOND);
this.minute = (byte) calendar.get(Calendar.MINUTE);
this.hour = (byte) calendar.get(Calendar.HOUR_OF_DAY);
this.day = new Day(time, calendar);
peg(calendar);
}
/**
* Returns the second within the minute.
*
* @return The second (0 - 59).
*/
public int getSecond() {
return this.second;
}
/**
* Returns the minute.
*
* @return The minute (never {@code null}).
*/
public Minute getMinute() {
return new Minute(this.minute, new Hour(this.hour, this.day));
}
/**
* Returns the first millisecond of the second. This will be determined
* relative to the time zone specified in the constructor, or in the
* calendar instance passed in the most recent call to the
* {@link #peg(Calendar)} method.
*
* @return The first millisecond of the second.
*
* @see #getLastMillisecond()
*/
@Override
public long getFirstMillisecond() {
return this.firstMillisecond;
}
/**
* Returns the last millisecond of the second. This will be
* determined relative to the time zone specified in the constructor, or
* in the calendar instance passed in the most recent call to the
* {@link #peg(Calendar)} method.
*
* @return The last millisecond of the second.
*
* @see #getFirstMillisecond()
*/
@Override
public long getLastMillisecond() {
return this.firstMillisecond + 999L;
}
/**
* Recalculates the start date/time and end date/time for this time period
* relative to the supplied calendar (which incorporates a time zone).
*
* @param calendar the calendar ({@code null} not permitted).
*
* @since 1.0.3
*/
@Override
public void peg(Calendar calendar) {
this.firstMillisecond = getFirstMillisecond(calendar);
}
/**
* Returns the second preceding this one.
* No matter what time zone and locale this instance was created with,
* the returned instance will use the default calendar for time
* calculations, obtained with {@link RegularTimePeriod#getCalendarInstance()}.
*
* @return The second preceding this one.
*/
@Override
public RegularTimePeriod previous() {
Second result = null;
if (this.second != FIRST_SECOND_IN_MINUTE) {
result = new Second(this.second - 1, getMinute());
}
else {
Minute previous = (Minute) getMinute().previous();
if (previous != null) {
result = new Second(LAST_SECOND_IN_MINUTE, previous);
}
}
return result;
}
/**
* Returns the second following this one.
* No matter what time zone and locale this instance was created with,
* the returned instance will use the default calendar for time
* calculations, obtained with {@link RegularTimePeriod#getCalendarInstance()}.
*
* @return The second following this one.
*/
@Override
public RegularTimePeriod next() {
Second result = null;
if (this.second != LAST_SECOND_IN_MINUTE) {
result = new Second(this.second + 1, getMinute());
}
else {
Minute next = (Minute) getMinute().next();
if (next != null) {
result = new Second(FIRST_SECOND_IN_MINUTE, next);
}
}
return result;
}
/**
* Returns a serial index number for the minute.
*
* @return The serial index number.
*/
@Override
public long getSerialIndex() {
long hourIndex = this.day.getSerialIndex() * 24L + this.hour;
long minuteIndex = hourIndex * 60L + this.minute;
return minuteIndex * 60L + this.second;
}
/**
* Returns the first millisecond of the minute.
*
* @param calendar the calendar/timezone ({@code null} not permitted).
*
* @return The first millisecond.
*
* @throws NullPointerException if {@code calendar} is {@code null}.
*/
@Override
public long getFirstMillisecond(Calendar calendar) {
int year = this.day.getYear();
int month = this.day.getMonth() - 1;
int d = this.day.getDayOfMonth();
calendar.clear();
calendar.set(year, month, d, this.hour, this.minute, this.second);
calendar.set(Calendar.MILLISECOND, 0);
return calendar.getTimeInMillis();
}
/**
* Returns the last millisecond of the second.
*
* @param calendar the calendar/timezone ({@code null} not permitted).
*
* @return The last millisecond.
*
* @throws NullPointerException if {@code calendar} is {@code null}.
*/
@Override
public long getLastMillisecond(Calendar calendar) {
return getFirstMillisecond(calendar) + 999L;
}
/**
* Tests the equality of this object against an arbitrary Object.
*
* This method will return true ONLY if the object is a Second object
* representing the same second as this instance.
*
* @param obj the object to compare ({@code null} permitted).
*
* @return {@code true} if second and minute of this and the object
* are the same.
*/
@Override
public boolean equals(Object obj) {
if (obj == this) {
return true;
}
if (!(obj instanceof Second)) {
return false;
}
Second that = (Second) obj;
if (this.second != that.second) {
return false;
}
if (this.minute != that.minute) {
return false;
}
if (this.hour != that.hour) {
return false;
}
if (!this.day.equals(that.day)) {
return false;
}
return true;
}
/**
* Returns a hash code for this object instance. The approach described by
* Joshua Bloch in "Effective Java" has been used here:
*
* {@code http://developer.java.sun.com/developer/Books/effectivejava
* /Chapter3.pdf}
*
* @return A hash code.
*/
@Override
public int hashCode() {
int result = 17;
result = 37 * result + this.second;
result = 37 * result + this.minute;
result = 37 * result + this.hour;
result = 37 * result + this.day.hashCode();
return result;
}
/**
* Returns an integer indicating the order of this Second object relative
* to the specified
* object: negative == before, zero == same, positive == after.
*
* @param o1 the object to compare.
*
* @return negative == before, zero == same, positive == after.
*/
@Override
public int compareTo(Object o1) {
int result;
// CASE 1 : Comparing to another Second object
// -------------------------------------------
if (o1 instanceof Second) {
Second s = (Second) o1;
if (this.firstMillisecond < s.firstMillisecond) {
return -1;
}
else if (this.firstMillisecond > s.firstMillisecond) {
return 1;
}
else {
return 0;
}
}
// CASE 2 : Comparing to another TimePeriod object
// -----------------------------------------------
else if (o1 instanceof RegularTimePeriod) {
// more difficult case - evaluate later...
result = 0;
}
// CASE 3 : Comparing to a non-TimePeriod object
// ---------------------------------------------
else {
// consider time periods to be ordered after general objects
result = 1;
}
return result;
}
/**
* Creates a new instance by parsing a string. The string is assumed to
* be in the format "YYYY-MM-DD HH:MM:SS", perhaps with leading or trailing
* whitespace.
*
* @param s the string to parse.
*
* @return The second, or {@code null} if the string is not parseable.
*/
public static Second parseSecond(String s) {
Second result = null;
s = s.trim();
String daystr = s.substring(0, Math.min(10, s.length()));
Day day = Day.parseDay(daystr);
if (day != null) {
String hmsstr = s.substring(Math.min(daystr.length() + 1,
s.length()), s.length());
hmsstr = hmsstr.trim();
int l = hmsstr.length();
String hourstr = hmsstr.substring(0, Math.min(2, l));
String minstr = hmsstr.substring(Math.min(3, l), Math.min(5, l));
String secstr = hmsstr.substring(Math.min(6, l), Math.min(8, l));
int hour = Integer.parseInt(hourstr);
if ((hour >= 0) && (hour <= 23)) {
int minute = Integer.parseInt(minstr);
if ((minute >= 0) && (minute <= 59)) {
Minute m = new Minute(minute, new Hour(hour, day));
int second = Integer.parseInt(secstr);
if ((second >= 0) && (second <= 59)) {
result = new Second(second, m);
}
}
}
}
return result;
}
}