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Java > Open Source Codes > org > objectweb > fractal > gui > history > model > HistoryManager


1 /***
2  * FractalGUI: a graphical tool to edit Fractal component configurations.
3  * Copyright (C) 2003 France Telecom R&D
4  *
5  * This library is free software; you can redistribute it and/or
6  * modify it under the terms of the GNU Lesser General Public
7  * License as published by the Free Software Foundation; either
8  * version 2 of the License, or (at your option) any later version.
9  *
10  * This library is distributed in the hope that it will be useful,
11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13  * Lesser General Public License for more details.
14  *
15  * You should have received a copy of the GNU Lesser General Public
16  * License along with this library; if not, write to the Free Software
17  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
18  *
19  * Contact: fractal@objectweb.org
20  *
21  * Authors: Eric Bruneton, Patrice Fauvel
22  */
23
24 package org.objectweb.fractal.gui.history.model;
25
26 /**
27  * A model of a navigation history.
28  */
29
30 public interface HistoryManager {
31
32   /**
33    * Returns <tt>true</tt> if it is possible to go back to a previous view.
34    *
35    * @return <tt>true</tt> if it is possible to go back to a previous view.
36    */
37
38   boolean canGoPrevious ();
39
40   /**
41    * Goes to the previous view.
42    */
43
44   void goPrevious ();
45
46   /**
47    * Returns <tt>true</tt> if it is possible to go to a next view.
48    *
49    * @return <tt>true</tt> if it is possible to go to a next view.
50    */
51
52   boolean canGoNext ();
53
54   /**
55    * Goes to the next view.
56    */
57
58   void goNext ();
59
60   /**
61    * Clears the state of this model. After a call to this method, {@link
62    * #canGoPrevious canGoPrevious} and {@link #canGoNext canGoNext} return
63    * <tt>false</tt>.
64    */
65
66   void clear ();
67 }
68
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