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jfreechart example source code file (Quarter.java)

This example jfreechart source code file (Quarter.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - jfreechart tags/keywords

first_quarter, first_quarter, illegalargumentexception, io, last_quarter, last_quarter, q, quarter, quarter, regulartimeperiod, regulartimeperiod, string, timeperiodformatexception, timezone, util, year

The jfreechart Quarter.java source code

/* ===========================================================
 * JFreeChart : a free chart library for the Java(tm) platform
 * ===========================================================
 *
 * (C) Copyright 2000-2008, 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 2001-2008, by Object Refinery Limited.
 *
 * Original Author:  David Gilbert (for Object Refinery Limited);
 * Contributor(s):   -;
 *
 * 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);
 * ------------- JFREECHART 1.0.x ---------------------------------------------
 * 05-Oct-2006 : Updated API docs (DG);
 * 06-Oct-2006 : Refactored to cache first and last millisecond values (DG);
 * 16-Sep-2008 : Deprecated DEFAULT_TIME_ZONE (DG);
 * 25-Nov-2008 : Added new constructor with Locale (DG);
 *
 */

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.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 short year;

    /** The quarter (1-4). */
    private byte quarter;

    /** The first millisecond. */
    private long firstMillisecond;

    /** The last millisecond. */
    private long lastMillisecond;

    /**
     * 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) {
        if ((quarter < FIRST_QUARTER) || (quarter > LAST_QUARTER)) {
            throw new IllegalArgumentException("Quarter outside valid range.");
        }
        this.year = (short) year;
        this.quarter = (byte) quarter;
        peg(Calendar.getInstance());
    }

    /**
     * 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 = (short) year.getYear();
        this.quarter = (byte) quarter;
        peg(Calendar.getInstance());
    }

    /**
     * Constructs a new instance, based on a date/time and the default time
     * zone.
     *
     * @param time  the date/time (<code>null not permitted).
     *
     * @see #Quarter(Date, TimeZone)
     */
    public Quarter(Date time) {
        this(time, TimeZone.getDefault());
    }

    /**
     * Constructs a Quarter, based on a date/time and time zone.
     *
     * @param time  the date/time.
     * @param zone  the zone (<code>null not permitted).
     *
     * @deprecated Since 1.0.12, use {@link #Quarter(Date, TimeZone, Locale)}
     *     instead.
     */
    public Quarter(Date time, TimeZone zone) {
        this(time, zone, Locale.getDefault());
    }

    /**
     * Creates a new <code>Quarter instance, using the specified
     * zone and locale.
     *
     * @param time  the current time.
     * @param zone  the time zone.
     * @param locale  the locale.
     *
     * @since 1.0.12
     */
    public Quarter(Date time, TimeZone zone, Locale locale) {
        Calendar calendar = Calendar.getInstance(zone, locale);
        calendar.setTime(time);
        int month = calendar.get(Calendar.MONTH) + 1;
        this.quarter = (byte) SerialDate.monthCodeToQuarter(month);
        this.year = (short) calendar.get(Calendar.YEAR);
        peg(calendar);
    }

    /**
     * Returns the quarter.
     *
     * @return The quarter.
     */
    public int getQuarter() {
        return this.quarter;
    }

    /**
     * Returns the year.
     *
     * @return The year.
     */
    public Year getYear() {
        return new Year(this.year);
    }

    /**
     * Returns the year.
     *
     * @return The year.
     *
     * @since 1.0.3
     */
    public int getYearValue() {
        return this.year;
    }

    /**
     * Returns the first millisecond of the quarter.  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 quarter.
     *
     * @see #getLastMillisecond()
     */
    public long getFirstMillisecond() {
        return this.firstMillisecond;
    }

    /**
     * Returns the last millisecond of the quarter.  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 quarter.
     *
     * @see #getFirstMillisecond()
     */
    public long getLastMillisecond() {
        return this.lastMillisecond;
    }

    /**
     * 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
     */
    public void peg(Calendar calendar) {
        this.firstMillisecond = getFirstMillisecond(calendar);
        this.lastMillisecond = getLastMillisecond(calendar);
    }

    /**
     * Returns the quarter preceding this one.
     *
     * @return The quarter preceding this one (or <code>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 {
            if (this.year > 1900) {
                result = new Quarter(LAST_QUARTER, this.year - 1);
            }
            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 {
            if (this.year < 9999) {
                result = new Quarter(FIRST_QUARTER, this.year + 1);
            }
            else {
                result = null;
            }
        }
        return result;
    }

    /**
     * Returns a serial index number for the quarter.
     *
     * @return The serial index number.
     */
    public long getSerialIndex() {
        return this.year * 4L + this.quarter;
    }

    /**
     * Tests the equality of this Quarter object to an arbitrary object.
     * Returns <code>true if the target is a Quarter instance
     * representing the same quarter as this object.  In all other cases,
     * returns <code>false.
     *
     * @param obj  the object (<code>null permitted).
     *
     * @return <code>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 == target.getYearValue()));
            }
            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:
     * <p>
     * <code>http://developer.java.sun.com/developer/Books/effectivejava
     * /Chapter3.pdf</code>
     *
     * @return A hash code.
     */
    public int hashCode() {
        int result = 17;
        result = 37 * result + this.quarter;
        result = 37 * result + this.year;
        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 - q.getYearValue();
            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 (<code>null not permitted).
     *
     * @return The first millisecond in the Quarter.
     *
     * @throws NullPointerException if <code>calendar is
     *     <code>null.
     */
    public long getFirstMillisecond(Calendar calendar) {
        int month = Quarter.FIRST_MONTH_IN_QUARTER[this.quarter];
        calendar.set(this.year, month - 1, 1, 0, 0, 0);
        calendar.set(Calendar.MILLISECOND, 0);
        // in the following line, we'd rather call calendar.getTimeInMillis()
        // to avoid object creation, but that isn't supported in Java 1.3.1
        return calendar.getTime().getTime();
    }

    /**
     * Returns the last millisecond of the Quarter, evaluated using the
     * supplied calendar (which determines the time zone).
     *
     * @param calendar  the calendar (<code>null not permitted).
     *
     * @return The last millisecond of the Quarter.
     *
     * @throws NullPointerException if <code>calendar is
     *     <code>null.
     */
    public long getLastMillisecond(Calendar calendar) {
        int month = Quarter.LAST_MONTH_IN_QUARTER[this.quarter];
        int eom = SerialDate.lastDayOfMonth(month, this.year);
        calendar.set(this.year, month - 1, eom, 23, 59, 59);
        calendar.set(Calendar.MILLISECOND, 999);
        // in the following line, we'd rather call calendar.getTimeInMillis()
        // to avoid object creation, but that isn't supported in Java 1.3.1
        return calendar.getTime().getTime();
    }

    /**
     * Parses the string argument as a quarter.
     * <P>
     * 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;

    }

}

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