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jfreechart example source code file (DateRange.java)

This example jfreechart source code file (DateRange.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, dateformat, dateformat, daterange, daterange, io, range, serializable, serializable, string, text, util

The jfreechart DateRange.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.]
 *
 * --------------
 * DateRange.java
 * --------------
 * (C) Copyright 2002-2008, by Object Refinery Limited and Contributors.
 *
 * Original Author:  David Gilbert (for Object Refinery Limited);
 * Contributor(s):   Bill Kelemen;
 *
 * Changes
 * -------
 * 22-Apr-2002 : Version 1 based on code by Bill Kelemen (DG);
 * 07-Oct-2002 : Fixed errors reported by Checkstyle (DG);
 * 23-Sep-2003 : Minor Javadoc update (DG);
 * 28-May-2008 : Fixed problem with immutability (DG);
 * 01-Sep-2008 : Added getLowerMillis() and getUpperMillis() (DG);
 *
 */

package org.jfree.data.time;

import java.io.Serializable;
import java.text.DateFormat;
import java.util.Date;

import org.jfree.data.Range;

/**
 * A range specified in terms of two <code>java.util.Date objects.
 * Instances of this class are immutable.
 */
public class DateRange extends Range implements Serializable {

    /** For serialization. */
    private static final long serialVersionUID = -4705682568375418157L;

    /** The lower bound for the range. */
    private long lowerDate;

    /** The upper bound for the range. */
    private long upperDate;

    /**
     * Default constructor.
     */
    public DateRange() {
        this(new Date(0), new Date(1));
    }

    /**
     * Constructs a new range.
     *
     * @param lower  the lower bound (<code>null not permitted).
     * @param upper  the upper bound (<code>null not permitted).
     */
    public DateRange(Date lower, Date upper) {
        super(lower.getTime(), upper.getTime());
        this.lowerDate = lower.getTime();
        this.upperDate = upper.getTime();
    }

    /**
     * Constructs a new range using two values that will be interpreted as
     * "milliseconds since midnight GMT, 1-Jan-1970".
     *
     * @param lower  the lower (oldest) date.
     * @param upper  the upper (most recent) date.
     */
    public DateRange(double lower, double upper) {
        super(lower, upper);
        this.lowerDate = (long) lower;
        this.upperDate = (long) upper;
    }

    /**
     * Constructs a new range that is based on another {@link Range}.  The
     * other range does not have to be a {@link DateRange}.  If it is not, the
     * upper and lower bounds are evaluated as milliseconds since midnight
     * GMT, 1-Jan-1970.
     *
     * @param other  the other range (<code>null not permitted).
     */
    public DateRange(Range other) {
        this(other.getLowerBound(), other.getUpperBound());
    }

    /**
     * Returns the lower (earlier) date for the range.
     *
     * @return The lower date for the range.
     *
     * @see #getLowerMillis()
     */
    public Date getLowerDate() {
        return new Date(this.lowerDate);
    }

    /**
     * Returns the lower bound of the range in milliseconds.
     *
     * @return The lower bound.
     *
     * @see #getLowerDate()
     *
     * @since 1.0.11
     */
    public long getLowerMillis() {
        return this.lowerDate;
    }

    /**
     * Returns the upper (later) date for the range.
     *
     * @return The upper date for the range.
     *
     * @see #getUpperMillis()
     */
    public Date getUpperDate() {
        return new Date(this.upperDate);
    }

    /**
     * Returns the upper bound of the range in milliseconds.
     *
     * @return The upper bound.
     *
     * @see #getUpperDate()
     *
     * @since 1.0.11
     */
    public long getUpperMillis() {
        return this.upperDate;
    }

    /**
     * Returns a string representing the date range (useful for debugging).
     *
     * @return A string representing the date range.
     */
    public String toString() {
        DateFormat df = DateFormat.getDateTimeInstance();
        return "[" + df.format(getLowerDate()) + " --> "
                + df.format(getUpperDate()) + "]";
    }

}

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