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jfreechart example source code file (Month.java)

This example jfreechart source code file (Month.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

can't, date, illegalargumentexception, io, month, month, regulartimeperiod, regulartimeperiod, serializable, string, timeperiodformatexception, timeperiodformatexception, timezone, util, year, year

The jfreechart Month.java source code

/* ===========================================================
 * JFreeChart : a free chart library for the Java(tm) platform
 * ===========================================================
 *
 * (C) Copyright 2000-2009, 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.]
 *
 * ----------
 * Month.java
 * ----------
 * (C) Copyright 2001-2009, by Object Refinery Limited and Contributors.
 *
 * Original Author:  David Gilbert (for Object Refinery Limited);
 * Contributor(s):   Chris Boek;
 *
 * Changes
 * -------
 * 11-Oct-2001 : Version 1 (DG);
 * 14-Nov-2001 : Added method to get year as primitive (DG);
 *               Override for toString() method (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 : Worked on the parseMonth() method (DG);
 * 14-Feb-2002 : Fixed bugs in the Month constructors (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);
 * 10-Sep-2002 : Added getSerialIndex() method (DG);
 * 04-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);
 * 01-Nov-2005 : Fixed bug 1345383 (argument check 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);
 * 04-Apr-2007 : Fixed bug in Month(Date, TimeZone) constructor (CB);
 * 01-Sep-2008 : Added clarification for previous() and next() methods (DG);
 * 16-Sep-2008 : Deprecated DEFAULT_TIME_ZONE, and updated parsing to handle
 *               extended range in Year (DG);
 * 25-Nov-2008 : Added new constructor with Locale (DG);
 * 04-Feb-2009 : Fix for new constructor with Locale - bug 2564636 (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;

/**
 * Represents a single month.  This class is immutable, which is a requirement
 * for all {@link RegularTimePeriod} subclasses.
 */
public class Month extends RegularTimePeriod implements Serializable {

    /** For serialization. */
    private static final long serialVersionUID = -5090216912548722570L;

    /** The month (1-12). */
    private int month;

    /** The year in which the month falls. */
    private int year;

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

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

    /**
     * Constructs a new Month, based on the current system time.
     */
    public Month() {
        this(new Date());
    }

    /**
     * Constructs a new month instance.
     *
     * @param month  the month (in the range 1 to 12).
     * @param year  the year.
     */
    public Month(int month, int year) {
        if ((month < 1) || (month > 12)) {
            throw new IllegalArgumentException("Month outside valid range.");
        }
        this.month = month;
        this.year = year;
        peg(Calendar.getInstance());
    }

    /**
     * Constructs a new month instance.
     *
     * @param month  the month (in the range 1 to 12).
     * @param year  the year.
     */
    public Month(int month, Year year) {
        if ((month < 1) || (month > 12)) {
            throw new IllegalArgumentException("Month outside valid range.");
        }
        this.month = month;
        this.year = year.getYear();
        peg(Calendar.getInstance());
    }

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

    /**
     * Constructs a new <code>Month instance, based on a date/time and
     * a time zone.  The first and last millisecond values are initially
     * pegged to the given time zone also.
     *
     * @param time  the date/time.
     * @param zone  the time zone (<code>null not permitted).
     *
     * @deprecated Since 1.0.12, use {@link #Month(Date, TimeZone, Locale)}
     *     instead.
     */
    public Month(Date time, TimeZone zone) {
        this(time, zone, Locale.getDefault());
    }

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

    /**
     * Returns the year in which the month falls.
     *
     * @return The year in which the month falls (as a Year object).
     */
    public Year getYear() {
        return new Year(this.year);
    }

    /**
     * Returns the year in which the month falls.
     *
     * @return The year in which the month falls (as an int).
     */
    public int getYearValue() {
        return this.year;
    }

    /**
     * Returns the month.  Note that 1=JAN, 2=FEB, ...
     *
     * @return The month.
     */
    public int getMonth() {
        return this.month;
    }

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

    /**
     * Returns the last millisecond of the month.  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 month.
     *
     * @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 month preceding this one.  Note that the returned
     * {@link Month} is "pegged" using the default time-zone, irrespective of
     * the time-zone used to peg of the current month (which is not recorded
     * anywhere).  See the {@link #peg(Calendar)} method.
     *
     * @return The month preceding this one.
     */
    public RegularTimePeriod previous() {
        Month result;
        if (this.month != MonthConstants.JANUARY) {
            result = new Month(this.month - 1, this.year);
        }
        else {
            if (this.year > 1900) {
                result = new Month(MonthConstants.DECEMBER, this.year - 1);
            }
            else {
                result = null;
            }
        }
        return result;
    }

    /**
     * Returns the month following this one.  Note that the returned
     * {@link Month} is "pegged" using the default time-zone, irrespective of
     * the time-zone used to peg of the current month (which is not recorded
     * anywhere).  See the {@link #peg(Calendar)} method.
     *
     * @return The month following this one.
     */
    public RegularTimePeriod next() {
        Month result;
        if (this.month != MonthConstants.DECEMBER) {
            result = new Month(this.month + 1, this.year);
        }
        else {
            if (this.year < 9999) {
                result = new Month(MonthConstants.JANUARY, this.year + 1);
            }
            else {
                result = null;
            }
        }
        return result;
    }

    /**
     * Returns a serial index number for the month.
     *
     * @return The serial index number.
     */
    public long getSerialIndex() {
        return this.year * 12L + this.month;
    }

    /**
     * Returns a string representing the month (e.g. "January 2002").
     * <P>
     * To do: look at internationalisation.
     *
     * @return A string representing the month.
     */
    public String toString() {
        return SerialDate.monthCodeToString(this.month) + " " + this.year;
    }

    /**
     * Tests the equality of this Month object to an arbitrary object.
     * Returns true if the target is a Month instance representing the same
     * month as this object.  In all other cases, returns false.
     *
     * @param obj  the object (<code>null permitted).
     *
     * @return <code>true if month and year of this and object are the
     *         same.
     */
    public boolean equals(Object obj) {
        if (obj == this) {
            return true;
        }
        if (!(obj instanceof Month)) {
            return false;
        }
        Month that = (Month) obj;
        if (this.month != that.month) {
            return false;
        }
        if (this.year != that.year) {
            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:
     * <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.month;
        result = 37 * result + this.year;
        return result;
    }

    /**
     * Returns an integer indicating the order of this Month 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 Month object
        // --------------------------------------------
        if (o1 instanceof Month) {
            Month m = (Month) o1;
            result = this.year - m.getYearValue();
            if (result == 0) {
                result = this.month - m.getMonth();
            }
        }

        // 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 the first millisecond of the month, evaluated using the supplied
     * calendar (which determines the time zone).
     *
     * @param calendar  the calendar (<code>null not permitted).
     *
     * @return The first millisecond of the month.
     *
     * @throws NullPointerException if <code>calendar is
     *     <code>null.
     */
    public long getFirstMillisecond(Calendar calendar) {
        calendar.set(this.year, this.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 month, evaluated using the supplied
     * calendar (which determines the time zone).
     *
     * @param calendar  the calendar (<code>null not permitted).
     *
     * @return The last millisecond of the month.
     *
     * @throws NullPointerException if <code>calendar is
     *     <code>null.
     */
    public long getLastMillisecond(Calendar calendar) {
        int eom = SerialDate.lastDayOfMonth(this.month, this.year);
        calendar.set(this.year, this.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 month.  This method is required to
     * accept the format "YYYY-MM".  It will also accept "MM-YYYY". Anything
     * else, at the moment, is a bonus.
     *
     * @param s  the string to parse (<code>null permitted).
     *
     * @return <code>null if the string is not parseable, the month
     *         otherwise.
     */
    public static Month parseMonth(String s) {
        Month result = null;
        if (s == null) {
            return result;
        }
        // trim whitespace from either end of the string
        s = s.trim();
        int i = Month.findSeparator(s);
        String s1, s2;
        boolean yearIsFirst;
        // if there is no separator, we assume the first four characters
        // are YYYY
        if (i == -1) {
            yearIsFirst = true;
            s1 = s.substring(0, 5);
            s2 = s.substring(5);
        }
        else {
            s1 = s.substring(0, i).trim();
            s2 = s.substring(i + 1, s.length()).trim();
            // now it is trickier to determine if the month or year is first
            Year y1 = Month.evaluateAsYear(s1);
            if (y1 == null) {
                yearIsFirst = false;
            }
            else {
                Year y2 = Month.evaluateAsYear(s2);
                if (y2 == null) {
                    yearIsFirst = true;
                }
                else {
                    yearIsFirst = (s1.length() > s2.length());
                }
            }
        }
        Year year;
        int month;
        if (yearIsFirst) {
            year = Month.evaluateAsYear(s1);
            month = SerialDate.stringToMonthCode(s2);
        }
        else {
            year = Month.evaluateAsYear(s2);
            month = SerialDate.stringToMonthCode(s1);
        }
        if (month == -1) {
            throw new TimePeriodFormatException("Can't evaluate the month.");
        }
        if (year == null) {
            throw new TimePeriodFormatException("Can't evaluate the year.");
        }
        result = new Month(month, year);
        return result;
    }

    /**
     * Finds the first occurrence of '-', or if that character is not found,
     * the first occurrence of ',', or the first occurrence of ' ' or '.'
     *
     * @param s  the string to parse.
     *
     * @return The position of the separator character, or <code>-1 if
     *     none of the characters were found.
     */
    private static int findSeparator(String s) {
        int result = s.indexOf('-');
        if (result == -1) {
            result = s.indexOf(',');
        }
        if (result == -1) {
            result = s.indexOf(' ');
        }
        if (result == -1) {
            result = s.indexOf('.');
        }
        return result;
    }

    /**
     * Creates a year from a string, or returns <code>null (format
     * exceptions suppressed).
     *
     * @param s  the string to parse.
     *
     * @return <code>null if the string is not parseable, the year
     *         otherwise.
     */
    private static Year evaluateAsYear(String s) {
        Year result = null;
        try {
            result = Year.parseYear(s);
        }
        catch (TimePeriodFormatException e) {
            // suppress
        }
        return result;
    }

}

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