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Java > Open Source Codes > org > jfree > data > time > TimePeriod


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 JavaDoc;
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 JavaDoc {
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 JavaDoc 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 JavaDoc getEnd();
69
70 }
71
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