001 /* =========================================================== 002 * JFreeChart : a free chart library for the Java(tm) platform 003 * =========================================================== 004 * 005 * (C) Copyright 2000-2005, 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 * [Java is a trademark or registered trademark of Sun Microsystems, Inc. 025 * in the United States and other countries.] 026 * 027 * --------------- 028 * TimePeriod.java 029 * --------------- 030 * (C) Copyright 2003-2005, by Object Refinery Limited and Contributors. 031 * 032 * Original Author: David Gilbert (for Object Refinery Limited); 033 * Contributor(s): -; 034 * 035 * $Id: TimePeriod.java,v 1.3.2.1 2005/10/25 21:35:24 mungady Exp $ 036 * 037 * Changes 038 * ------- 039 * 10-Jan-2003 : Version 1 (DG); 040 * 13-Mar-2003 : Moved to com.jrefinery.data.time package (DG); 041 * 27-Jan-2005 : Implemented Comparable (DG); 042 * 043 */ 044 045 package org.jfree.data.time; 046 047 import java.util.Date; 048 049 /** 050 * A period of time measured to millisecond precision using two instances of 051 * <code>java.util.Date</code>. 052 */ 053 public interface TimePeriod extends Comparable { 054 055 /** 056 * Returns the start date/time. This will always be on or before the 057 * end date. 058 * 059 * @return The start date/time (never <code>null</code>). 060 */ 061 public Date getStart(); 062 063 /** 064 * Returns the end date/time. This will always be on or after the 065 * start date. 066 * 067 * @return The end date/time (never <code>null</code>). 068 */ 069 public Date getEnd(); 070 071 }