1 /***
2 * DataSource.java
3 *
4 * This file is part of the creme library.
5 * The creme library intends to ease the development effort of large
6 * applications by providing easy to use support classes.
7 *
8 * Copyright (C) 2002 Denis Bregeon
9 *
10 * This library is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU Lesser General Public
12 * License as published by the Free Software Foundation; either
13 * version 2.1 of the License, or (at your option) any later version.
14 *
15 * This library is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18 * Lesser General Public License for more details.
19 *
20 * You should have received a copy of the GNU Lesser General Public
21 * License along with this library; if not, write to the Free Software
22 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
23 *
24 * contact information: dbregeon@sourceforge.net
25 */
26 package org.jcreme.reporting;
27
28 /***
29 * This is the general interface for all the DataSources. It provides the
30 * declaration of the event system support. DataSources can be used by reports
31 * to gain access to the data they need. It provides a great flexibility to
32 * assemble different data channels.
33 *
34 * @author $Author: dbregeon $
35 * @version $Revision: 1.2 $
36 */
37 public interface DataSource {
38 /***
39 * Adds a DataChangeListener to this source. The listener will be notified
40 * of any data change detected by the source.
41 *
42 * @param listener
43 * the listener to add.
44 */
45 void addDataChangeListener(DataChangeListener listener);
46
47 /***
48 * Removes a DataChangeListener from this source.
49 *
50 * @param listener
51 * the listener to remove.
52 */
53 void removeDataChangeListener(DataChangeListener listener);
54 }