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jfreechart example source code file (Minute.java)

This example jfreechart source code file (Minute.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

day, day, first_minute_in_hour, hour, hour, illegalargumentexception, io, last_minute_in_hour, minute, minute, null, regulartimeperiod, string, string, timezone, util

The jfreechart Minute.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.]
 *
 * -----------
 * Minute.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 Minute(Date) constructor, and changed the range
 *               to start from zero instead of 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 parseMinute() method (DG);
 * 19-Mar-2002 : Changed API, the minute is now defined in relation to an
 *               Hour (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);
 * 11-Dec-2006 : Fix for previous() - bug 1611872 (DG);
 * 16-Sep-2008 : Deprecated DEFAULT_TIME_ZONE (DG);
 * 02-Mar-2009 : Added new constructor that specifies 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 minute.  This class is immutable, which is a requirement for
 * all {@link RegularTimePeriod} subclasses.
 */
public class Minute extends RegularTimePeriod implements Serializable {

    /** For serialization. */
    private static final long serialVersionUID = 2144572840034842871L;

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

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

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

    /** The hour in which the minute falls. */
    private byte hour;

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

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

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

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

    /**
     * Constructs a new Minute.
     *
     * @param minute  the minute (0 to 59).
     * @param hour  the hour (<code>null not permitted).
     */
    public Minute(int minute, Hour hour) {
        if (hour == null) {
            throw new IllegalArgumentException("Null 'hour' argument.");
        }
        this.minute = (byte) minute;
        this.hour = (byte) hour.getHour();
        this.day = hour.getDay();
        peg(Calendar.getInstance());
    }

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

    /**
     * Constructs a new Minute, based on the supplied date/time and timezone.
     *
     * @param time  the 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 Minute(Date time, TimeZone zone) {
        this(time, zone, Locale.getDefault());
    }

    /**
     * Constructs a new Minute, based on the supplied date/time and timezone.
     *
     * @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 Minute(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);
        int min = calendar.get(Calendar.MINUTE);
        this.minute = (byte) min;
        this.hour = (byte) calendar.get(Calendar.HOUR_OF_DAY);
        this.day = new Day(time, zone, locale);
        peg(calendar);
    }

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

    /**
     * Returns the day.
     *
     * @return The day.
     *
     * @since 1.0.3
     */
    public Day getDay() {
        return this.day;
    }

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

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

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

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

    /**
     * Returns the last millisecond of the minute.  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 minute.
     *
     * @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 minute preceding this one.
     *
     * @return The minute preceding this one.
     */
    public RegularTimePeriod previous() {
        Minute result;
        if (this.minute != FIRST_MINUTE_IN_HOUR) {
            result = new Minute(this.minute - 1, getHour());
        }
        else {
            Hour h = (Hour) getHour().previous();
            if (h != null) {
                result = new Minute(LAST_MINUTE_IN_HOUR, h);
            }
            else {
                result = null;
            }
        }
        return result;
    }

    /**
     * Returns the minute following this one.
     *
     * @return The minute following this one.
     */
    public RegularTimePeriod next() {
        Minute result;
        if (this.minute != LAST_MINUTE_IN_HOUR) {
            result = new Minute(this.minute + 1, getHour());
        }
        else { // we are at the last minute in the hour...
            Hour nextHour = (Hour) getHour().next();
            if (nextHour != null) {
                result = new Minute(FIRST_MINUTE_IN_HOUR, nextHour);
            }
            else {
                result = null;
            }
        }
        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;
        return hourIndex * 60L + this.minute;
    }

    /**
     * Returns the first millisecond of the minute.
     *
     * @param calendar  the calendar which defines the 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, 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 minute.
     *
     * @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 day = this.day.getDayOfMonth();

        calendar.clear();
        calendar.set(year, month, day, this.hour, this.minute, 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 a Minute object
     * representing the same minute as this instance.
     *
     * @param obj  the object to compare (<code>null permitted).
     *
     * @return <code>true if the minute and hour value of this and the
     *      object are the same.
     */
    public boolean equals(Object obj) {
        if (obj == this) {
            return true;
        }
        if (!(obj instanceof Minute)) {
            return false;
        }
        Minute that = (Minute) obj;
        if (this.minute != that.minute) {
            return false;
        }
        if (this.hour != that.hour) {
            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.minute;
        result = 37 * result + this.hour;
        result = 37 * result + this.day.hashCode();
        return result;
    }

    /**
     * Returns an integer indicating the order of this Minute object relative
     * to the specified object:
     *
     * negative == before, zero == same, positive == after.
     *
     * @param o1  object to compare.
     *
     * @return negative == before, zero == same, positive == after.
     */
    public int compareTo(Object o1) {
        int result;

        // CASE 1 : Comparing to another Minute object
        // -------------------------------------------
        if (o1 instanceof Minute) {
            Minute m = (Minute) o1;
            result = getHour().compareTo(m.getHour());
            if (result == 0) {
                result = this.minute - m.getMinute();
            }
        }

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

        String daystr = s.substring(0, Math.min(10, s.length()));
        Day day = Day.parseDay(daystr);
        if (day != null) {
            String hmstr = s.substring(
                Math.min(daystr.length() + 1, s.length()), s.length()
            );
            hmstr = hmstr.trim();

            String hourstr = hmstr.substring(0, Math.min(2, hmstr.length()));
            int hour = Integer.parseInt(hourstr);

            if ((hour >= 0) && (hour <= 23)) {
                String minstr = hmstr.substring(
                    Math.min(hourstr.length() + 1, hmstr.length()),
                    hmstr.length()
                );
                int minute = Integer.parseInt(minstr);
                if ((minute >= 0) && (minute <= 59)) {
                    result = new Minute(minute, new Hour(hour, day));
                }
            }
        }
        return result;
    }

}

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