    001    /* ===========================================================
    002     * JFreeChart : a free chart library for the Java(tm) platform
    003     * ===========================================================
    004     *
    005     * (C) Copyright 2000-2011, by Object Refinery Limited and Contributors.
    006     *
    007     * Project Info:  http://www.jfree.org/jfreechart/index.html
    008     *
    009     * This library is free software; you can redistribute it and/or modify it
    010     * under the terms of the GNU Lesser General Public License as published by
    011     * the Free Software Foundation; either version 2.1 of the License, or
    012     * (at your option) any later version.
    013     *
    014     * This library is distributed in the hope that it will be useful, but
    015     * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
    016     * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
    017     * License for more details.
    018     *
    019     * You should have received a copy of the GNU Lesser General Public
    020     * License along with this library; if not, write to the Free Software
    021     * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301,
    022     * USA.
    023     *
    024     * [Oracle and Java are registered trademarks of Oracle and/or its affiliates.
    025     * Other names may be trademarks of their respective owners.]
    026     *
    027     * ---------------
    028     * TimePeriod.java
    029     * ---------------
    030     * (C) Copyright 2003-2008, by Object Refinery Limited and Contributors.
    031     *
    032     * Original Author:  David Gilbert (for Object Refinery Limited);
    033     * Contributor(s):   -;
    034     *
    035     * Changes
    036     * -------
    037     * 10-Jan-2003 : Version 1 (DG);
    038     * 13-Mar-2003 : Moved to com.jrefinery.data.time package (DG);
    039     * 27-Jan-2005 : Implemented Comparable (DG);
    040     *
    041     */
    042
    043    package org.jfree.data.time;
    044
    045    import java.util.Date;
    046
    047    /**
    048     * A period of time measured to millisecond precision using two instances of
    049     * <code>java.util.Date</code>.
    050     */
    051    public interface TimePeriod extends Comparable {
    052
    053        /**
    054         * Returns the start date/time.  This will always be on or before the
    055         * end date.
    056         *
    057         * @return The start date/time (never <code>null</code>).
    058         */
    059        public Date getStart();
    060
    061        /**
    062         * Returns the end date/time.  This will always be on or after the
    063         * start date.
    064         *
    065         * @return The end date/time (never <code>null</code>).
    066         */
    067        public Date getEnd();
    068
    069    }