org.jfree.data.time.Quarter Maven / Gradle / Ivy
/* ===========================================================
* JFreeChart : a free chart library for the Java(tm) platform
* ===========================================================
*
* (C) Copyright 2000-2005, 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.
*
* [Java is a trademark or registered trademark of Sun Microsystems, Inc.
* in the United States and other countries.]
*
* ------------
* Quarter.java
* ------------
* (C) Copyright 2001-2005, by Object Refinery Limited.
*
* Original Author: David Gilbert (for Object Refinery Limited);
* Contributor(s): -;
*
* $Id: Quarter.java,v 1.6.2.2 2005/12/10 20:34:21 mungady Exp $
*
* Changes
* -------
* 11-Oct-2001 : Version 1 (DG);
* 18-Dec-2001 : Changed order of parameters in constructor (DG);
* 19-Dec-2001 : Added a new constructor as suggested by Paul English (DG);
* 29-Jan-2002 : Added a new method parseQuarter(String) (DG);
* 14-Feb-2002 : Fixed bug in Quarter(Date) constructor (DG);
* 26-Feb-2002 : Changed getStart(), getMiddle() and getEnd() methods to
* evaluate with reference to a particular time zone (DG);
* 19-Mar-2002 : Changed API for TimePeriod classes (DG);
* 24-Jun-2002 : Removed main method (just test code) (DG);
* 10-Sep-2002 : Added getSerialIndex() method (DG);
* 07-Oct-2002 : Fixed errors reported by Checkstyle (DG);
* 10-Jan-2003 : Changed base class and method names (DG);
* 13-Mar-2003 : Moved to com.jrefinery.data.time package, and implemented
* Serializable (DG);
* 21-Oct-2003 : Added hashCode() method (DG);
* 10-Dec-2005 : Fixed argument checking bug (1377239) in constructor (DG);
*
*/
package org.jfree.data.time;
import java.io.Serializable;
import java.util.Calendar;
import java.util.Date;
import java.util.TimeZone;
import org.jfree.date.MonthConstants;
import org.jfree.date.SerialDate;
/**
* Defines a quarter (in a given year). The range supported is Q1 1900 to
* Q4 9999. This class is immutable, which is a requirement for all
* {@link RegularTimePeriod} subclasses.
*/
public class Quarter extends RegularTimePeriod implements Serializable {
/** For serialization. */
private static final long serialVersionUID = 3810061714380888671L;
/** Constant for quarter 1. */
public static final int FIRST_QUARTER = 1;
/** Constant for quarter 4. */
public static final int LAST_QUARTER = 4;
/** The first month in each quarter. */
public static final int[] FIRST_MONTH_IN_QUARTER = {
0, MonthConstants.JANUARY, MonthConstants.APRIL, MonthConstants.JULY,
MonthConstants.OCTOBER
};
/** The last month in each quarter. */
public static final int[] LAST_MONTH_IN_QUARTER = {
0, MonthConstants.MARCH, MonthConstants.JUNE, MonthConstants.SEPTEMBER,
MonthConstants.DECEMBER
};
/** The year in which the quarter falls. */
private Year year;
/** The quarter (1-4). */
private int quarter;
/**
* Constructs a new Quarter, based on the current system date/time.
*/
public Quarter() {
this(new Date());
}
/**
* Constructs a new quarter.
*
* @param year the year (1900 to 9999).
* @param quarter the quarter (1 to 4).
*/
public Quarter(int quarter, int year) {
this(quarter, new Year(year));
}
/**
* Constructs a new quarter.
*
* @param quarter the quarter (1 to 4).
* @param year the year (1900 to 9999).
*/
public Quarter(int quarter, Year year) {
if ((quarter < FIRST_QUARTER) || (quarter > LAST_QUARTER)) {
throw new IllegalArgumentException("Quarter outside valid range.");
}
this.year = year;
this.quarter = quarter;
}
/**
* Constructs a new Quarter, based on a date/time and the default time zone.
*
* @param time the date/time.
*/
public Quarter(Date time) {
this(time, RegularTimePeriod.DEFAULT_TIME_ZONE);
}
/**
* Constructs a Quarter, based on a date/time and time zone.
*
* @param time the date/time.
* @param zone the zone.
*/
public Quarter(Date time, TimeZone zone) {
Calendar calendar = Calendar.getInstance(zone);
calendar.setTime(time);
int month = calendar.get(Calendar.MONTH) + 1;
this.quarter = SerialDate.monthCodeToQuarter(month);
this.year = new Year(calendar.get(Calendar.YEAR));
}
/**
* Returns the quarter.
*
* @return The quarter.
*/
public int getQuarter() {
return this.quarter;
}
/**
* Returns the year.
*
* @return The year.
*/
public Year getYear() {
return this.year;
}
/**
* Returns the quarter preceding this one.
*
* @return The quarter preceding this one (or null if this is Q1 1900).
*/
public RegularTimePeriod previous() {
Quarter result;
if (this.quarter > FIRST_QUARTER) {
result = new Quarter(this.quarter - 1, this.year);
}
else {
Year prevYear = (Year) this.year.previous();
if (prevYear != null) {
result = new Quarter(LAST_QUARTER, prevYear);
}
else {
result = null;
}
}
return result;
}
/**
* Returns the quarter following this one.
*
* @return The quarter following this one (or null if this is Q4 9999).
*/
public RegularTimePeriod next() {
Quarter result;
if (this.quarter < LAST_QUARTER) {
result = new Quarter(this.quarter + 1, this.year);
}
else {
Year nextYear = (Year) this.year.next();
if (nextYear != null) {
result = new Quarter(FIRST_QUARTER, nextYear);
}
else {
result = null;
}
}
return result;
}
/**
* Returns a serial index number for the quarter.
*
* @return The serial index number.
*/
public long getSerialIndex() {
return this.year.getYear() * 4L + this.quarter;
}
/**
* Tests the equality of this Quarter object to an arbitrary object.
* Returns true if the target is a Quarter instance representing the same
* quarter as this object. In all other cases, returns false.
*
* @param obj the object.
*
* @return true if quarter and year of this and the object are
* the same.
*/
public boolean equals(Object obj) {
if (obj != null) {
if (obj instanceof Quarter) {
Quarter target = (Quarter) obj;
return (
(this.quarter == target.getQuarter())
&& (this.year.equals(target.getYear()))
);
}
else {
return false;
}
}
else {
return false;
}
}
/**
* Returns a hash code for this object instance. The approach described by
* Joshua Bloch in "Effective Java" has been used here:
*
* http://developer.java.sun.com/developer/Books/effectivejava
* /Chapter3.pdf
*
* @return A hash code.
*/
public int hashCode() {
int result = 17;
result = 37 * result + this.quarter;
result = 37 * result + this.year.hashCode();
return result;
}
/**
* Returns an integer indicating the order of this Quarter 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.
*/
public int compareTo(Object o1) {
int result;
// CASE 1 : Comparing to another Quarter object
// --------------------------------------------
if (o1 instanceof Quarter) {
Quarter q = (Quarter) o1;
result = this.year.getYear() - q.getYear().getYear();
if (result == 0) {
result = this.quarter - q.getQuarter();
}
}
// 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;
}
/**
* Returns a string representing the quarter (e.g. "Q1/2002").
*
* @return A string representing the quarter.
*/
public String toString() {
return "Q" + this.quarter + "/" + this.year;
}
/**
* Returns the first millisecond in the Quarter, evaluated using the
* supplied calendar (which determines the time zone).
*
* @param calendar the calendar.
*
* @return The first millisecond in the Quarter.
*/
public long getFirstMillisecond(Calendar calendar) {
int month = Quarter.FIRST_MONTH_IN_QUARTER[this.quarter];
Day first = new Day(1, month, this.year.getYear());
return first.getFirstMillisecond(calendar);
}
/**
* Returns the last millisecond of the Quarter, evaluated using the
* supplied calendar (which determines the time zone).
*
* @param calendar the calendar.
*
* @return The last millisecond of the Quarter.
*/
public long getLastMillisecond(Calendar calendar) {
int month = Quarter.LAST_MONTH_IN_QUARTER[this.quarter];
int eom = SerialDate.lastDayOfMonth(month, this.year.getYear());
Day last = new Day(eom, month, this.year.getYear());
return last.getLastMillisecond(calendar);
}
/**
* Parses the string argument as a quarter.
*
* This method should accept the following formats: "YYYY-QN" and "QN-YYYY",
* where the "-" can be a space, a forward-slash (/), comma or a dash (-).
* @param s A string representing the quarter.
*
* @return The quarter.
*/
public static Quarter parseQuarter(String s) {
// find the Q and the integer following it (remove both from the
// string)...
int i = s.indexOf("Q");
if (i == -1) {
throw new TimePeriodFormatException("Missing Q.");
}
if (i == s.length() - 1) {
throw new TimePeriodFormatException("Q found at end of string.");
}
String qstr = s.substring(i + 1, i + 2);
int quarter = Integer.parseInt(qstr);
String remaining = s.substring(0, i) + s.substring(i + 2, s.length());
// replace any / , or - with a space
remaining = remaining.replace('/', ' ');
remaining = remaining.replace(',', ' ');
remaining = remaining.replace('-', ' ');
// parse the string...
Year year = Year.parseYear(remaining.trim());
Quarter result = new Quarter(quarter, year);
return result;
}
}