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jfreechart example source code file (RegularTimePeriod.java)

This example jfreechart source code file (RegularTimePeriod.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, calendar, class, constructor, date, date, default_time_zone, exception, reflection, regulartimeperiod, regulartimeperiod, timeperiod, timezone, timezone, util, working_calendar

The jfreechart RegularTimePeriod.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.]
 *
 * ----------------------
 * RegularTimePeriod.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);
 * 26-Feb-2002 : Changed getStart(), getMiddle() and getEnd() methods to
 *               evaluate with reference to a particular time zone (DG);
 * 29-May-2002 : Implemented MonthConstants interface, so that these constants
 *               are conveniently available (DG);
 * 10-Sep-2002 : Added getSerialIndex() method (DG);
 * 10-Jan-2003 : Renamed TimePeriod --> RegularTimePeriod (DG);
 * 13-Mar-2003 : Moved to com.jrefinery.data.time package (DG);
 * 29-Apr-2004 : Changed getMiddleMillisecond() methods to fix bug 943985 (DG);
 * 25-Nov-2004 : Added utility methods (DG);
 * ------------- JFREECHART 1.0.x ---------------------------------------------
 * 06-Oct-2006 : Deprecated the WORKING_CALENDAR field and several methods,
 *               added new peg() method (DG);
 * 16-Sep-2008 : Deprecated DEFAULT_TIME_ZONE (DG);
 *
 */

package org.jfree.data.time;

import java.lang.reflect.Constructor;
import java.util.Calendar;
import java.util.Date;
import java.util.TimeZone;

import org.jfree.date.MonthConstants;

/**
 * An abstract class representing a unit of time.  Convenient methods are
 * provided for calculating the next and previous time periods.  Conversion
 * methods are defined that return the first and last milliseconds of the time
 * period.  The results from these methods are timezone dependent.
 * <P>
 * This class is immutable, and all subclasses should be immutable also.
 */
public abstract class RegularTimePeriod implements TimePeriod, Comparable,
                                                   MonthConstants {

    /**
     * Creates a time period that includes the specified millisecond, assuming
     * the given time zone.
     *
     * @param c  the time period class.
     * @param millisecond  the time.
     * @param zone  the time zone.
     *
     * @return The time period.
     */
    public static RegularTimePeriod createInstance(Class c, Date millisecond,
                                                   TimeZone zone) {
        RegularTimePeriod result = null;
        try {
            Constructor constructor = c.getDeclaredConstructor(
                    new Class[] {Date.class, TimeZone.class});
            result = (RegularTimePeriod) constructor.newInstance(
                    new Object[] {millisecond, zone});
        }
        catch (Exception e) {
            // do nothing, so null is returned
        }
        return result;
    }

    /**
     * Returns a subclass of {@link RegularTimePeriod} that is smaller than
     * the specified class.
     *
     * @param c  a subclass of {@link RegularTimePeriod}.
     *
     * @return A class.
     */
    public static Class downsize(Class c) {
        if (c.equals(Year.class)) {
            return Quarter.class;
        }
        else if (c.equals(Quarter.class)) {
            return Month.class;
        }
        else if (c.equals(Month.class)) {
            return Day.class;
        }
        else if (c.equals(Day.class)) {
            return Hour.class;
        }
        else if (c.equals(Hour.class)) {
            return Minute.class;
        }
        else if (c.equals(Minute.class)) {
            return Second.class;
        }
        else if (c.equals(Second.class)) {
            return Millisecond.class;
        }
        else {
            return Millisecond.class;
        }
    }

    /**
     * Returns the time period preceding this one, or <code>null if some
     * lower limit has been reached.
     *
     * @return The previous time period (possibly <code>null).
     */
    public abstract RegularTimePeriod previous();

    /**
     * Returns the time period following this one, or <code>null if some
     * limit has been reached.
     *
     * @return The next time period (possibly <code>null).
     */
    public abstract RegularTimePeriod next();

    /**
     * Returns a serial index number for the time unit.
     *
     * @return The serial index number.
     */
    public abstract long getSerialIndex();

    //////////////////////////////////////////////////////////////////////////

    /**
     * The default time zone.
     *
     * @deprecated As of 1.0.11, we discourage the use of this field - use
     *     {@link TimeZone#getDefault()} instead.
     */
    public static final TimeZone DEFAULT_TIME_ZONE = TimeZone.getDefault();

    /**
     * A working calendar (recycle to avoid unnecessary object creation).
     *
     * @deprecated This was a bad idea, don't use it!
     */
    public static final Calendar WORKING_CALENDAR = Calendar.getInstance(
            DEFAULT_TIME_ZONE);

    /**
     * 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 abstract void peg(Calendar calendar);

    /**
     * Returns the date/time that marks the start of the time period.  This
     * method returns a new <code>Date instance every time it is called.
     *
     * @return The start date/time.
     *
     * @see #getFirstMillisecond()
     */
    public Date getStart() {
        return new Date(getFirstMillisecond());
    }

    /**
     * Returns the date/time that marks the end of the time period.  This
     * method returns a new <code>Date instance every time it is called.
     *
     * @return The end date/time.
     *
     * @see #getLastMillisecond()
     */
    public Date getEnd() {
        return new Date(getLastMillisecond());
    }

    /**
     * Returns the first millisecond of the time period.  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 time period.
     *
     * @see #getLastMillisecond()
     */
    public abstract long getFirstMillisecond();

    /**
     * Returns the first millisecond of the time period, evaluated within a
     * specific time zone.
     *
     * @param zone  the time zone (<code>null not permitted).
     *
     * @return The first millisecond of the time period.
     *
     * @deprecated As of 1.0.3, you should avoid using this method (it creates
     *     a new Calendar instance every time it is called).  You are advised
     *     to call {@link #getFirstMillisecond(Calendar)} instead.
     *
     * @see #getLastMillisecond(TimeZone)
     */
    public long getFirstMillisecond(TimeZone zone) {
        Calendar calendar = Calendar.getInstance(zone);
        return getFirstMillisecond(calendar);
    }

    /**
     * Returns the first millisecond of the time period, evaluated using the
     * supplied calendar (which incorporates a timezone).
     *
     * @param calendar  the calendar (<code>null not permitted).
     *
     * @return The first millisecond of the time period.
     *
     * @throws NullPointerException if <code>calendar,/code> is
     *     </code>null.
     *
     * @see #getLastMillisecond(Calendar)
     */
    public abstract long getFirstMillisecond(Calendar calendar);

    /**
     * Returns the last millisecond of the time period.  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 time period.
     *
     * @see #getFirstMillisecond()
     */
    public abstract long getLastMillisecond();

    /**
     * Returns the last millisecond of the time period, evaluated within a
     * specific time zone.
     *
     * @param zone  the time zone (<code>null not permitted).
     *
     * @return The last millisecond of the time period.
     *
     * @deprecated As of 1.0.3, you should avoid using this method (it creates
     *     a new Calendar instance every time it is called).  You are advised
     *     to call {@link #getLastMillisecond(Calendar)} instead.
     *
     * @see #getFirstMillisecond(TimeZone)
     */
    public long getLastMillisecond(TimeZone zone) {
        Calendar calendar = Calendar.getInstance(zone);
        return getLastMillisecond(calendar);
    }

    /**
     * Returns the last millisecond of the time period, evaluated using the
     * supplied calendar (which incorporates a timezone).
     *
     * @param calendar  the calendar (<code>null not permitted).
     *
     * @return The last millisecond of the time period.
     *
     * @see #getFirstMillisecond(Calendar)
     */
    public abstract long getLastMillisecond(Calendar calendar);

    /**
     * Returns the millisecond closest to the middle of the time period.
     *
     * @return The middle millisecond.
     */
    public long getMiddleMillisecond() {
        long m1 = getFirstMillisecond();
        long m2 = getLastMillisecond();
        return m1 + (m2 - m1) / 2;
    }

    /**
     * Returns the millisecond closest to the middle of the time period,
     * evaluated within a specific time zone.
     *
     * @param zone  the time zone (<code>null not permitted).
     *
     * @return The middle millisecond.
     *
     * @deprecated As of 1.0.3, you should avoid using this method (it creates
     *     a new Calendar instance every time it is called).  You are advised
     *     to call {@link #getMiddleMillisecond(Calendar)} instead.
     */
    public long getMiddleMillisecond(TimeZone zone) {
        Calendar calendar = Calendar.getInstance(zone);
        long m1 = getFirstMillisecond(calendar);
        long m2 = getLastMillisecond(calendar);
        return m1 + (m2 - m1) / 2;
    }

    /**
     * Returns the millisecond closest to the middle of the time period,
     * evaluated using the supplied calendar (which incorporates a timezone).
     *
     * @param calendar  the calendar.
     *
     * @return The middle millisecond.
     */
    public long getMiddleMillisecond(Calendar calendar) {
        long m1 = getFirstMillisecond(calendar);
        long m2 = getLastMillisecond(calendar);
        return m1 + (m2 - m1) / 2;
    }

    /**
     * Returns a string representation of the time period.
     *
     * @return The string.
     */
    public String toString() {
        return String.valueOf(getStart());
    }

}

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