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jfreechart example source code file (FixedMillisecond.java)

This example jfreechart source code file (FixedMillisecond.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, date, fixedmillisecond, fixedmillisecond, io, regulartimeperiod, regulartimeperiod, serializable, serializable, util

The jfreechart FixedMillisecond.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.]
 *
 * ---------------------
 * FixedMillisecond.java
 * ---------------------
 * (C) Copyright 2002-2008, by Object Refinery Limited.
 *
 * Original Author:  David Gilbert (for Object Refinery Limited);
 * Contributor(s):   -;
 *
 * Changes
 * -------
 * 19-Mar-2002 : Version 1, based on original Millisecond implementation (DG);
 * 24-Jun-2002 : Removed unnecessary imports (DG);
 * 10-Sep-2002 : Added getSerialIndex() method (DG);
 * 07-Oct-2002 : Fixed errors reported by Checkstyle (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 ---------------------------------------------
 * 06-Oct-2006 : Added peg() method (DG);
 * 28-May-2008 : Fixed immutability problem (DG);
 *
 */

package org.jfree.data.time;

import java.io.Serializable;
import java.util.Calendar;
import java.util.Date;

/**
 * Wrapper for a <code>java.util.Date object that allows it to be used
 * as a {@link RegularTimePeriod}.  This class is immutable, which is a
 * requirement for all {@link RegularTimePeriod} subclasses.
 */
public class FixedMillisecond extends RegularTimePeriod
        implements Serializable {

    /** For serialization. */
    private static final long serialVersionUID = 7867521484545646931L;

    /** The millisecond. */
    private long time;

    /**
     * Constructs a millisecond based on the current system time.
     */
    public FixedMillisecond() {
        this(new Date());
    }

    /**
     * Constructs a millisecond.
     *
     * @param millisecond  the millisecond (same encoding as java.util.Date).
     */
    public FixedMillisecond(long millisecond) {
        this(new Date(millisecond));
    }

    /**
     * Constructs a millisecond.
     *
     * @param time  the time.
     */
    public FixedMillisecond(Date time) {
        this.time = time.getTime();
    }

    /**
     * Returns the date/time.
     *
     * @return The date/time.
     */
    public Date getTime() {
        return new Date(this.time);
    }

    /**
     * This method is overridden to do nothing.
     *
     * @param calendar  ignored
     *
     * @since 1.0.3
     */
    public void peg(Calendar calendar) {
        // nothing to do
    }

    /**
     * Returns the millisecond preceding this one.
     *
     * @return The millisecond preceding this one.
     */
    public RegularTimePeriod previous() {
        RegularTimePeriod result = null;
        long t = this.time;
        if (t != Long.MIN_VALUE) {
            result = new FixedMillisecond(t - 1);
        }
        return result;
    }

    /**
     * Returns the millisecond following this one.
     *
     * @return The millisecond following this one.
     */
    public RegularTimePeriod next() {
        RegularTimePeriod result = null;
        long t = this.time;
        if (t != Long.MAX_VALUE) {
            result = new FixedMillisecond(t + 1);
        }
        return result;
    }

    /**
     * Tests the equality of this object against an arbitrary Object.
     *
     * @param object  the object to compare
     *
     * @return A boolean.
     */
    public boolean equals(Object object) {
        if (object instanceof FixedMillisecond) {
            FixedMillisecond m = (FixedMillisecond) object;
            return this.time == m.getFirstMillisecond();
        }
        else {
            return false;
        }

    }

    /**
     * Returns a hash code for this object instance.
     *
     * @return A hash code.
     */
    public int hashCode() {
        return (int) this.time;
    }

    /**
     * Returns an integer indicating the order of this Millisecond 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;
        long difference;

        // CASE 1 : Comparing to another Second object
        // -------------------------------------------
        if (o1 instanceof FixedMillisecond) {
            FixedMillisecond t1 = (FixedMillisecond) o1;
            difference = this.time - t1.time;
            if (difference > 0) {
                result = 1;
            }
            else {
                if (difference < 0) {
                   result = -1;
                }
                else {
                    result = 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;

    }

    /**
     * Returns the first millisecond of the time period.
     *
     * @return The first millisecond of the time period.
     */
    public long getFirstMillisecond() {
        return this.time;
    }


    /**
     * Returns the first millisecond of the time period.
     *
     * @param calendar  the calendar.
     *
     * @return The first millisecond of the time period.
     */
    public long getFirstMillisecond(Calendar calendar) {
        return this.time;
    }

    /**
     * Returns the last millisecond of the time period.
     *
     * @return The last millisecond of the time period.
     */
    public long getLastMillisecond() {
        return this.time;
    }

    /**
     * Returns the last millisecond of the time period.
     *
     * @param calendar  the calendar.
     *
     * @return The last millisecond of the time period.
     */
    public long getLastMillisecond(Calendar calendar) {
        return this.time;
    }

    /**
     * Returns the millisecond closest to the middle of the time period.
     *
     * @return The millisecond closest to the middle of the time period.
     */
    public long getMiddleMillisecond() {
        return this.time;
    }

    /**
     * Returns the millisecond closest to the middle of the time period.
     *
     * @param calendar  the calendar.
     *
     * @return The millisecond closest to the middle of the time period.
     */
    public long getMiddleMillisecond(Calendar calendar) {
        return this.time;
    }

    /**
     * Returns a serial index number for the millisecond.
     *
     * @return The serial index number.
     */
    public long getSerialIndex() {
        return this.time;
    }

}

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