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jfreechart example source code file (Second.java)

This example jfreechart source code file (Second.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, first_second_in_minute, io, last_second_in_minute, minute, minute, regulartimeperiod, regulartimeperiod, second, second, serializable, string, string, timezone, util

The jfreechart Second.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.]
 *
 * -----------
 * Second.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 Second(Date) constructor, and changed start of
 *               range to zero from one (DG);
 * 26-Feb-2002 : Changed getStart(), getMiddle() and getEnd() methods to
 *               evaluate with reference to a particular time zone (DG);
 * 13-Mar-2002 : Added parseSecond() method (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);
 * 05-Mar-2003 : Fixed bug in getLastMillisecond() 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 : 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 a second in a particular day.  This class is immutable, which is
 * a requirement for all {@link RegularTimePeriod} subclasses.
 */
public class Second extends RegularTimePeriod implements Serializable {

    /** For serialization. */
    private static final long serialVersionUID = -6536564190712383466L;

    /** Useful constant for the first second in a minute. */
    public static final int FIRST_SECOND_IN_MINUTE = 0;

    /** Useful constant for the last second in a minute. */
    public static final int LAST_SECOND_IN_MINUTE = 59;

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

    /** The hour of the day. */
    private byte hour;

    /** The minute. */
    private byte minute;

    /** The second. */
    private byte second;

    /**
     * The first millisecond.  We don't store the last millisecond, because it
     * is always firstMillisecond + 999L.
     */
    private long firstMillisecond;

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

    /**
     * Constructs a new Second.
     *
     * @param second  the second (0 to 24*60*60-1).
     * @param minute  the minute (<code>null not permitted).
     */
    public Second(int second, Minute minute) {
        if (minute == null) {
            throw new IllegalArgumentException("Null 'minute' argument.");
        }
        this.day = minute.getDay();
        this.hour = (byte) minute.getHourValue();
        this.minute = (byte) minute.getMinute();
        this.second = (byte) second;
        peg(Calendar.getInstance());
    }

    /**
     * Creates a new second.
     *
     * @param second  the second (0-59).
     * @param minute  the minute (0-59).
     * @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 Second(int second, int minute, int hour,
                  int day, int month, int year) {
        this(second, new Minute(minute, hour, day, month, year));
    }

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

    /**
     * Creates a new second based on the supplied time and time zone.
     *
     * @param time  the instant in time.
     * @param zone  the time zone.
     *
     * @deprecated As of 1.0.13, use the constructor that specifies the locale
     *     also.
     */
    public Second(Date time, TimeZone zone) {
        this(time, zone, Locale.getDefault());
    }

    /**
     * Creates a new second based on the supplied time and time zone.
     *
     * @param time  the 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 Second(Date time, TimeZone zone, Locale locale) {
        Calendar calendar = Calendar.getInstance(zone, locale);
        calendar.setTime(time);
        this.second = (byte) calendar.get(Calendar.SECOND);
        this.minute = (byte) calendar.get(Calendar.MINUTE);
        this.hour = (byte) calendar.get(Calendar.HOUR_OF_DAY);
        this.day = new Day(time, zone, locale);
        peg(calendar);
    }

    /**
     * Returns the second within the minute.
     *
     * @return The second (0 - 59).
     */
    public int getSecond() {
        return this.second;
    }

    /**
     * Returns the minute.
     *
     * @return The minute (never <code>null).
     */
    public Minute getMinute() {
        return new Minute(this.minute, new Hour(this.hour, this.day));
    }

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

    /**
     * Returns the last millisecond of the second.  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 second.
     *
     * @see #getFirstMillisecond()
     */
    public long getLastMillisecond() {
        return this.firstMillisecond + 999L;
    }

    /**
     * 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);
    }

    /**
     * Returns the second preceding this one.
     *
     * @return The second preceding this one.
     */
    public RegularTimePeriod previous() {
        Second result = null;
        if (this.second != FIRST_SECOND_IN_MINUTE) {
            result = new Second(this.second - 1, getMinute());
        }
        else {
            Minute previous = (Minute) getMinute().previous();
            if (previous != null) {
                result = new Second(LAST_SECOND_IN_MINUTE, previous);
            }
        }
        return result;
    }

    /**
     * Returns the second following this one.
     *
     * @return The second following this one.
     */
    public RegularTimePeriod next() {
        Second result = null;
        if (this.second != LAST_SECOND_IN_MINUTE) {
            result = new Second(this.second + 1, getMinute());
        }
        else {
            Minute next = (Minute) getMinute().next();
            if (next != null) {
                result = new Second(FIRST_SECOND_IN_MINUTE, next);
            }
        }
        return result;
    }

    /**
     * Returns a serial index number for the minute.
     *
     * @return The serial index number.
     */
    public long getSerialIndex() {
        long hourIndex = this.day.getSerialIndex() * 24L + this.hour;
        long minuteIndex = hourIndex * 60L + this.minute;
        return minuteIndex * 60L + this.second;
    }

    /**
     * Returns the first millisecond of the minute.
     *
     * @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 day = this.day.getDayOfMonth();
        calendar.clear();
        calendar.set(year, month, day, this.hour, this.minute, this.second);
        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 second.
     *
     * @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) {
        return getFirstMillisecond(calendar) + 999L;
    }

    /**
     * Tests the equality of this object against an arbitrary Object.
     * <P>
     * This method will return true ONLY if the object is a Second object
     * representing the same second as this instance.
     *
     * @param obj  the object to compare (<code>null permitted).
     *
     * @return <code>true if second and minute of this and the object
     *         are the same.
     */
    public boolean equals(Object obj) {
        if (obj == this) {
            return true;
        }
        if (!(obj instanceof Second)) {
            return false;
        }
        Second that = (Second) obj;
        if (this.second != that.second) {
            return false;
        }
        if (this.minute != that.minute) {
            return false;
        }
        if (this.hour != that.hour) {
            return false;
        }
        if (!this.day.equals(that.day)) {
            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.second;
        result = 37 * result + this.minute;
        result = 37 * result + this.hour;
        result = 37 * result + this.day.hashCode();
        return result;
    }

    /**
     * Returns an integer indicating the order of this Second 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 Second object
        // -------------------------------------------
        if (o1 instanceof Second) {
            Second s = (Second) o1;
            if (this.firstMillisecond < s.firstMillisecond) {
                return -1;
            }
            else if (this.firstMillisecond > s.firstMillisecond) {
                return 1;
            }
            else {
                return 0;
            }
        }

        // 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 a new instance by parsing a string.  The string is assumed to
     * be in the format "YYYY-MM-DD HH:MM:SS", perhaps with leading or trailing
     * whitespace.
     *
     * @param s  the string to parse.
     *
     * @return The second, or <code>null if the string is not parseable.
     */
    public static Second parseSecond(String s) {
        Second result = null;
        s = s.trim();
        String daystr = s.substring(0, Math.min(10, s.length()));
        Day day = Day.parseDay(daystr);
        if (day != null) {
            String hmsstr = s.substring(Math.min(daystr.length() + 1,
                    s.length()), s.length());
            hmsstr = hmsstr.trim();

            int l = hmsstr.length();
            String hourstr = hmsstr.substring(0, Math.min(2, l));
            String minstr = hmsstr.substring(Math.min(3, l), Math.min(5, l));
            String secstr = hmsstr.substring(Math.min(6, l), Math.min(8, l));
            int hour = Integer.parseInt(hourstr);

            if ((hour >= 0) && (hour <= 23)) {

                int minute = Integer.parseInt(minstr);
                if ((minute >= 0) && (minute <= 59)) {

                    Minute m = new Minute(minute, new Hour(hour, day));
                    int second = Integer.parseInt(secstr);
                    if ((second >= 0) && (second <= 59)) {
                        result = new Second(second, m);
                    }
                }
            }
        }
        return result;
    }

}

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