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Java > Open Source Codes > net > sf > jasperreports > crosstabs > JRCrosstabDataset


1 /*
2  * ============================================================================
3  * GNU Lesser General Public License
4  * ============================================================================
5  *
6  * JasperReports - Free Java report-generating library.
7  * Copyright (C) 2001-2006 JasperSoft Corporation http://www.jaspersoft.com
8  *
9  * This library is free software; you can redistribute it and/or
10  * modify it under the terms of the GNU Lesser General Public
11  * License as published by the Free Software Foundation; either
12  * version 2.1 of the License, or (at your option) any later version.
13  *
14  * This library is distributed in the hope that it will be useful,
15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17  * Lesser General Public 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
22  *
23  * JasperSoft Corporation
24  * 303 Second Street, Suite 450 North
25  * San Francisco, CA 94107
26  * http://www.jaspersoft.com
27  */
28 package net.sf.jasperreports.crosstabs;
29
30 import net.sf.jasperreports.engine.JRElementDataset;
31
32 /**
33  * Input dataset interface used by crosstabs.
34  *
35  * @author Lucian Chirita (lucianc@users.sourceforge.net)
36  * @version $Id: JRCrosstabDataset.java 1229 2006-04-19 13:27:35 +0300 (Wed, 19 Apr 2006) teodord $
37  */
38 public interface JRCrosstabDataset extends JRElementDataset
39 {
40     /**
41      * Returns whether the crosstab data is pre-sorted according to the
42      * crosstab's groups.
43      * <p>
44      * The crosstab calculation engine can optimize the calculations
45      * if the data is sorted by the row groups and column groups.
46      * For example, if there are two row groups R1 and R2 (subgroup of R1)
47      * and three column groups C1, C2 and C3 the data should be sorted
48      * by R1, R2, C1, C2, C3.
49      *
50      * @return whether the crosstab data is pre-sorted
51      */
52     public boolean isDataPreSorted();
53 }
54
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