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jfreechart example source code file (Hour.java)

This example jfreechart source code file (Hour.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

date, day, day, first_hour_in_day, hour, hour, illegalargumentexception, io, last_hour_in_day, null, null, regulartimeperiod, regulartimeperiod, string, timezone, util

The jfreechart Hour.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.]
 *
 * ---------
 * Hour.java
 * ---------
 * (C) Copyright 2001-2009, 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);
 * 14-Feb-2002 : Fixed bug in Hour(Date) constructor (DG);
 * 26-Feb-2002 : Changed getStart(), getMiddle() and getEnd() methods to
 *               evaluate with reference to a particular time zone (DG);
 * 15-Mar-2002 : Changed API (DG);
 * 16-Apr-2002 : Fixed small time zone bug in constructor (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, and new constructor for
 *               convenience (DG);
 * 30-Sep-2004 : Replaced getTime().getTime() with getTimeInMillis() (DG);
 * 04-Nov-2004 : Reverted change of 30-Sep-2004, because it won't work for
 *               JDK 1.3 (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 : In Hour(Date, TimeZone), peg milliseconds using specified
 *               time zone (DG);
 * 16-Sep-2008 : Deprecated DEFAULT_TIME_ZONE (DG);
 * 02-Mar-2009 : 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 an hour in a specific day.  This class is immutable, which is a
 * requirement for all {@link RegularTimePeriod} subclasses.
 */
public class Hour extends RegularTimePeriod implements Serializable {

    /** For serialization. */
    private static final long serialVersionUID = -835471579831937652L;

    /** Useful constant for the first hour in the day. */
    public static final int FIRST_HOUR_IN_DAY = 0;

    /** Useful constant for the last hour in the day. */
    public static final int LAST_HOUR_IN_DAY = 23;

    /** The day. */
    private Day day;

    /** The hour. */
    private byte hour;

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

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

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

    /**
     * Constructs a new Hour.
     *
     * @param hour  the hour (in the range 0 to 23).
     * @param day  the day (<code>null not permitted).
     */
    public Hour(int hour, Day day) {
        if (day == null) {
            throw new IllegalArgumentException("Null 'day' argument.");
        }
        this.hour = (byte) hour;
        this.day = day;
        peg(Calendar.getInstance());
    }

    /**
     * Creates a new hour.
     *
     * @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 Hour(int hour, int day, int month, int year) {
        this(hour, new Day(day, month, year));
    }

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

    /**
     * Constructs a new instance, based on the supplied date/time evaluated
     * in the specified time zone.
     *
     * @param time  the date-time (<code>null not permitted).
     * @param zone  the time zone (<code>null not permitted).
     *
     * @deprecated As of 1.0.13, use the constructor that specifies the locale
     *     also.
     */
    public Hour(Date time, TimeZone zone) {
        this(time, zone, Locale.getDefault());
    }

    /**
     * Constructs a new instance, based on the supplied date/time evaluated
     * in the specified time zone.
     *
     * @param time  the date-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 Hour(Date time, TimeZone zone, Locale locale) {
        if (time == null) {
            throw new IllegalArgumentException("Null 'time' argument.");
        }
        if (zone == null) {
            throw new IllegalArgumentException("Null 'zone' argument.");
        }
        if (locale == null) {
            throw new IllegalArgumentException("Null 'locale' argument.");
        }
        Calendar calendar = Calendar.getInstance(zone, locale);
        calendar.setTime(time);
        this.hour = (byte) calendar.get(Calendar.HOUR_OF_DAY);
        this.day = new Day(time, zone, locale);
        peg(calendar);
    }

    /**
     * Returns the hour.
     *
     * @return The hour (0 <= hour <= 23).
     */
    public int getHour() {
        return this.hour;
    }

    /**
     * Returns the day in which this hour falls.
     *
     * @return The day.
     */
    public Day getDay() {
        return this.day;
    }

    /**
     * Returns the year in which this hour falls.
     *
     * @return The year.
     */
    public int getYear() {
        return this.day.getYear();
    }

    /**
     * Returns the month in which this hour falls.
     *
     * @return The month.
     */
    public int getMonth() {
        return this.day.getMonth();
    }

    /**
     * Returns the day-of-the-month in which this hour falls.
     *
     * @return The day-of-the-month.
     */
    public int getDayOfMonth() {
        return this.day.getDayOfMonth();
    }

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

    /**
     * Returns the last millisecond of the hour.  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 hour.
     *
     * @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 hour preceding this one.
     *
     * @return The hour preceding this one.
     */
    public RegularTimePeriod previous() {
        Hour result;
        if (this.hour != FIRST_HOUR_IN_DAY) {
            result = new Hour(this.hour - 1, this.day);
        }
        else { // we are at the first hour in the day...
            Day prevDay = (Day) this.day.previous();
            if (prevDay != null) {
                result = new Hour(LAST_HOUR_IN_DAY, prevDay);
            }
            else {
                result = null;
            }
        }
        return result;
    }

    /**
     * Returns the hour following this one.
     *
     * @return The hour following this one.
     */
    public RegularTimePeriod next() {
        Hour result;
        if (this.hour != LAST_HOUR_IN_DAY) {
            result = new Hour(this.hour + 1, this.day);
        }
        else { // we are at the last hour in the day...
            Day nextDay = (Day) this.day.next();
            if (nextDay != null) {
                result = new Hour(FIRST_HOUR_IN_DAY, nextDay);
            }
            else {
                result = null;
            }
        }
        return result;
    }

    /**
     * Returns a serial index number for the hour.
     *
     * @return The serial index number.
     */
    public long getSerialIndex() {
        return this.day.getSerialIndex() * 24L + this.hour;
    }

    /**
     * Returns the first millisecond of the hour.
     *
     * @param calendar  the calendar/timezone (<code>null not permitted).
     *
     * @return The first millisecond.
     *
     * @throws NullPointerException if <code>calendar is
     *     <code>null.
     */
    public long getFirstMillisecond(Calendar calendar) {
        int year = this.day.getYear();
        int month = this.day.getMonth() - 1;
        int dom = this.day.getDayOfMonth();
        calendar.set(year, month, dom, this.hour, 0, 0);
        calendar.set(Calendar.MILLISECOND, 0);
        //return calendar.getTimeInMillis();  // this won't work for JDK 1.3
        return calendar.getTime().getTime();
    }

    /**
     * Returns the last millisecond of the hour.
     *
     * @param calendar  the calendar/timezone (<code>null not permitted).
     *
     * @return The last millisecond.
     *
     * @throws NullPointerException if <code>calendar is
     *     <code>null.
     */
    public long getLastMillisecond(Calendar calendar) {
        int year = this.day.getYear();
        int month = this.day.getMonth() - 1;
        int dom = this.day.getDayOfMonth();
        calendar.set(year, month, dom, this.hour, 59, 59);
        calendar.set(Calendar.MILLISECOND, 999);
        //return calendar.getTimeInMillis();  // this won't work for JDK 1.3
        return calendar.getTime().getTime();
    }

    /**
     * Tests the equality of this object against an arbitrary Object.
     * <P>
     * This method will return true ONLY if the object is an Hour object
     * representing the same hour as this instance.
     *
     * @param obj  the object to compare (<code>null permitted).
     *
     * @return <code>true if the hour and day value of the object
     *      is the same as this.
     */
    public boolean equals(Object obj) {
        if (obj == this) {
            return true;
        }
        if (!(obj instanceof Hour)) {
            return false;
        }
        Hour that = (Hour) obj;
        if (this.hour != that.hour) {
            return false;
        }
        if (!this.day.equals(that.day)) {
            return false;
        }
        return true;
    }

    /**
     * Returns a string representation of this instance, for debugging
     * purposes.
     *
     * @return A string.
     */
    public String toString() {
    	return "[" + this.hour + "," + getDayOfMonth() + "/" + getMonth() + "/"
    	        + getYear() + "]";
    }
 
    /**
     * 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.hour;
        result = 37 * result + this.day.hashCode();
        return result;
    }

    /**
     * Returns an integer indicating the order of this Hour 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 Hour object
        // -----------------------------------------
        if (o1 instanceof Hour) {
            Hour h = (Hour) o1;
            result = getDay().compareTo(h.getDay());
            if (result == 0) {
                result = this.hour - h.getHour();
            }
        }

        // 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 an Hour instance by parsing a string.  The string is assumed to
     * be in the format "YYYY-MM-DD HH", perhaps with leading or trailing
     * whitespace.
     *
     * @param s  the hour string to parse.
     *
     * @return <code>null if the string is not parseable, the hour
     *         otherwise.
     */
    public static Hour parseHour(String s) {
        Hour result = null;
        s = s.trim();

        String daystr = s.substring(0, Math.min(10, s.length()));
        Day day = Day.parseDay(daystr);
        if (day != null) {
            String hourstr = s.substring(
                Math.min(daystr.length() + 1, s.length()), s.length()
            );
            hourstr = hourstr.trim();
            int hour = Integer.parseInt(hourstr);
            // if the hour is 0 - 23 then create an hour
            if ((hour >= FIRST_HOUR_IN_DAY) && (hour <= LAST_HOUR_IN_DAY)) {
                result = new Hour(hour, day);
            }
        }

        return result;
    }

}

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