01: /* ===========================================================
02: * JFreeChart : a free chart library for the Java(tm) platform
03: * ===========================================================
04: *
05: * (C) Copyright 2000-2005, by Object Refinery Limited and Contributors.
06: *
07: * Project Info: http://www.jfree.org/jfreechart/index.html
08: *
09: * 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
20: * License along with this library; if not, write to the Free Software
21: * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
22: * USA.
23: *
24: * [Java is a trademark or registered trademark of Sun Microsystems, Inc.
25: * in the United States and other countries.]
26: *
27: * ---------------
28: * TimePeriod.java
29: * ---------------
30: * (C) Copyright 2003-2005, by Object Refinery Limited and Contributors.
31: *
32: * Original Author: David Gilbert (for Object Refinery Limited);
33: * Contributor(s): -;
34: *
35: * $Id: TimePeriod.java,v 1.3.2.1 2005/10/25 21:35:24 mungady Exp $
36: *
37: * Changes
38: * -------
39: * 10-Jan-2003 : Version 1 (DG);
40: * 13-Mar-2003 : Moved to com.jrefinery.data.time package (DG);
41: * 27-Jan-2005 : Implemented Comparable (DG);
42: *
43: */
44:
45: package org.jfree.data.time;
46:
47: import java.util.Date;
48:
49: /**
50: * A period of time measured to millisecond precision using two instances of
51: * <code>java.util.Date</code>.
52: */
53: public interface TimePeriod extends Comparable {
54:
55: /**
56: * Returns the start date/time. This will always be on or before the
57: * end date.
58: *
59: * @return The start date/time (never <code>null</code>).
60: */
61: public Date getStart();
62:
63: /**
64: * Returns the end date/time. This will always be on or after the
65: * start date.
66: *
67: * @return The end date/time (never <code>null</code>).
68: */
69: public Date getEnd();
70:
71: }
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