1. /* ===========================================================

  2.  * JFreeChart : a free chart library for the Java(tm) platform

  3.  * ===========================================================

  4.  *

  5.  * (C) Copyright 2000-2005, by Object Refinery Limited and Contributors.

  6.  *

  7.  * Project Info:  http://www.jfree.org/jfreechart/index.html

  8.  *

  9.  * This library is free software; you can redistribute it and/or modify it under the terms

  10.  * of the GNU Lesser General Public License as published by the Free Software Foundation;

  11.  * either version 2.1 of the License, or (at your option) any later version.

  12.  *

  13.  * This library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;

  14.  * without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

  15.  * See the GNU Lesser General Public License for more details.

  16.  *

  17.  * You should have received a copy of the GNU Lesser General Public License along with this

  18.  * library; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330,

  19.  * Boston, MA 02111-1307, USA.

  20.  *

  21.  * [Java is a trademark or registered trademark of Sun Microsystems, Inc. 

  22.  * in the United States and other countries.]

  23.  *

  24.  * ---------------

  25.  * TimePeriod.java

  26.  * ---------------

  27.  * (C) Copyright 2003-2005, by Object Refinery Limited and Contributors.

  28.  *

  29.  * Original Author:  David Gilbert (for Object Refinery Limited);

  30.  * Contributor(s):   -;

  31.  *

  32.  * $Id: TimePeriod.java,v 1.2 2005/01/28 13:16:33 mungady Exp $

  33.  *

  34.  * Changes

  35.  * -------

  36.  * 10-Jan-2003 : Version 1 (DG);

  37.  * 13-Mar-2003 : Moved to com.jrefinery.data.time package (DG);

  38.  * 27-Jan-2005 : Implemented Comparable (DG);

  39.  *

  40.  */

  41. 

  42. package org.jfree.data.time;

  43. 

  44. import java.util.Date;

  45. 

  46. /**

  47.  * A period of time measured to millisecond precision using two instances of

  48.  * <code>java.util.Date</code>.

  49.  */

  50. public interface TimePeriod extends Comparable {

  51. 

  52.     /**

  53.      * Returns the start date/time.  This will always be on or before the 

  54.      * end date.

  55.      *

  56.      * @return The start date/time (never <code>null</code>).

  57.      */

  58.     public Date getStart();

  59. 

  60.     /**

  61.      * Returns the end date/time.  This will always be on or after the 

  62.      * start date.

  63.      *

  64.      * @return The end date/time (never <code>null</code>).

  65.      */

  66.     public Date getEnd();

  67. 

  68. }