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jfreechart example source code file (Year.java)

This example jfreechart source code file (Year.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

calendar, date, illegalargumentexception, illegalargumentexception, io, locale, minimum_year, regulartimeperiod, regulartimeperiod, serializable, timeperiodformatexception, timezone, timezone, util, year, year

The jfreechart Year.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.]
 *
 * ---------
 * Year.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);
 * 14-Nov-2001 : Override for toString() method (DG);
 * 19-Dec-2001 : Added a new constructor as suggested by Paul English (DG);
 * 29-Jan-2002 : Worked on parseYear() method (DG);
 * 14-Feb-2002 : Fixed bug in Year(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);
 * 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);
 * 05-Mar-2003 : Fixed bug in getFirstMillisecond() picked up in JUnit
 *               tests (DG);
 * 13-Mar-2003 : Moved to com.jrefinery.data.time package, and implemented
 *               Serializable (DG);
 * 21-Oct-2003 : Added hashCode() method (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 : Extended range of valid years, and 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;

/**
 * Represents a year in the range -9999 to 9999.  This class is immutable,
 * which is a requirement for all {@link RegularTimePeriod} subclasses.
 */
public class Year extends RegularTimePeriod implements Serializable {

    /**
     * The minimum year value.
     *
     * @since 1.0.11
     */
    public static final int MINIMUM_YEAR = -9999;

    /**
     * The maximum year value.
     *
     * @since 1.0.11
     */
    public static final int MAXIMUM_YEAR = 9999;

    /** For serialization. */
    private static final long serialVersionUID = -7659990929736074836L;

    /** The year. */
    private short year;

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

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

    /**
     * Creates a new <code>Year, based on the current system date/time.
     */
    public Year() {
        this(new Date());
    }

    /**
     * Creates a time period representing a single year.
     *
     * @param year  the year.
     */
    public Year(int year) {
        if ((year < Year.MINIMUM_YEAR) || (year > Year.MAXIMUM_YEAR)) {
            throw new IllegalArgumentException(
                "Year constructor: year (" + year + ") outside valid range.");
        }
        this.year = (short) year;
        peg(Calendar.getInstance());
    }

    /**
     * Creates a new <code>Year, based on a particular instant in time,
     * using the default time zone.
     *
     * @param time  the time (<code>null not permitted).
     *
     * @see #Year(Date, TimeZone)
     */
    public Year(Date time) {
        this(time, TimeZone.getDefault());
    }

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

    /**
     * Creates a new <code>Year instance, for the specified time zone
     * and locale.
     *
     * @param time  the current time (<code>null not permitted).
     * @param zone  the time zone.
     * @param locale  the locale.
     *
     * @since 1.0.12
     */
    public Year(Date time, TimeZone zone, Locale locale) {
        Calendar calendar = Calendar.getInstance(zone, locale);
        calendar.setTime(time);
        this.year = (short) calendar.get(Calendar.YEAR);
        peg(calendar);
    }

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

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

    /**
     * Returns the last millisecond of the year.  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 year.
     *
     * @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 year preceding this one.
     *
     * @return The year preceding this one (or <code>null if the
     *         current year is -9999).
     */
    public RegularTimePeriod previous() {
        if (this.year > Year.MINIMUM_YEAR) {
            return new Year(this.year - 1);
        }
        else {
            return null;
        }
    }

    /**
     * Returns the year following this one.
     *
     * @return The year following this one (or <code>null if the current
     *         year is 9999).
     */
    public RegularTimePeriod next() {
        if (this.year < Year.MAXIMUM_YEAR) {
            return new Year(this.year + 1);
        }
        else {
            return null;
        }
    }

    /**
     * Returns a serial index number for the year.
     * <P>
     * The implementation simply returns the year number (e.g. 2002).
     *
     * @return The serial index number.
     */
    public long getSerialIndex() {
        return this.year;
    }

    /**
     * Returns the first millisecond of the year, evaluated using the supplied
     * calendar (which determines the time zone).
     *
     * @param calendar  the calendar (<code>null not permitted).
     *
     * @return The first millisecond of the year.
     *
     * @throws NullPointerException if <code>calendar is
     *     <code>null.
     */
    public long getFirstMillisecond(Calendar calendar) {
        calendar.set(this.year, Calendar.JANUARY, 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 year, evaluated using the supplied
     * calendar (which determines the time zone).
     *
     * @param calendar  the calendar (<code>null not permitted).
     *
     * @return The last millisecond of the year.
     *
     * @throws NullPointerException if <code>calendar is
     *     <code>null.
     */
    public long getLastMillisecond(Calendar calendar) {
        calendar.set(this.year, Calendar.DECEMBER, 31, 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();
    }

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

    /**
     * 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;
        int c = this.year;
        result = 37 * result + c;
        return result;
    }

    /**
     * Returns an integer indicating the order of this <code>Year 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 Year object
        // -----------------------------------------
        if (o1 instanceof Year) {
            Year y = (Year) o1;
            result = this.year - y.getYear();
        }

        // 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 year..
     *
     * @return A string representing the year.
     */
    public String toString() {
        return Integer.toString(this.year);
    }

    /**
     * Parses the string argument as a year.
     * <P>
     * The string format is YYYY.
     *
     * @param s  a string representing the year.
     *
     * @return <code>null if the string is not parseable, the year
     *         otherwise.
     */
    public static Year parseYear(String s) {

        // parse the string...
        int y;
        try {
            y = Integer.parseInt(s.trim());
        }
        catch (NumberFormatException e) {
            throw new TimePeriodFormatException("Cannot parse string.");
        }

        // create the year...
        try {
            return new Year(y);
        }
        catch (IllegalArgumentException e) {
            throw new TimePeriodFormatException("Year outside valid range.");
        }
    }

}

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