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 10 * under the terms of the GNU Lesser General Public License as published by 11 * the Free Software Foundation; either version 2.1 of the License, or 12 * (at your option) any later version. 13 * 14 * This library is distributed in the hope that it will be useful, but 15 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY 16 * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public 17 * License for more details. 18 * 19 * You should have received a copy of the GNU Lesser General Public License 20 * along with this library; if not, write to the Free Software Foundation, 21 * Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA. 22 * 23 * [Java is a trademark or registered trademark of Sun Microsystems, Inc. 24 * in the United States and other countries.] 25 * 26 * --------------- 27 * TimePeriod.java 28 * --------------- 29 * (C) Copyright 2003-2005, by Object Refinery Limited and Contributors. 30 * 31 * Original Author: David Gilbert (for Object Refinery Limited); 32 * Contributor(s): -; 33 * 34 * $Id: TimePeriod.java,v 1.3 2005/03/15 21:50:37 mungady Exp $ 35 * 36 * Changes 37 * ------- 38 * 10-Jan-2003 : Version 1 (DG); 39 * 13-Mar-2003 : Moved to com.jrefinery.data.time package (DG); 40 * 27-Jan-2005 : Implemented Comparable (DG); 41 * 42 */ 43 44 package org.jfree.data.time; 45 46 import java.util.Date; 47 48 /** 49 * A period of time measured to millisecond precision using two instances of 50 * <code>java.util.Date</code>. 51 */ 52 public interface TimePeriod extends Comparable { 53 54 /** 55 * Returns the start date/time. This will always be on or before the 56 * end date. 57 * 58 * @return The start date/time (never <code>null</code>). 59 */ 60 public Date getStart(); 61 62 /** 63 * Returns the end date/time. This will always be on or after the 64 * start date. 65 * 66 * @return The end date/time (never <code>null</code>). 67 */ 68 public Date getEnd(); 69 70 } 71