01: /*
02: * ============================================================================
03: * GNU Lesser General Public License
04: * ============================================================================
05: *
06: * JasperReports - Free Java report-generating library.
07: * Copyright (C) 2001-2006 JasperSoft Corporation http://www.jaspersoft.com
08: *
09: * 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 10:27:35Z teodord $
37: */
38: public interface JRCrosstabDataset extends JRElementDataset {
39: /**
40: * Returns whether the crosstab data is pre-sorted according to the
41: * crosstab's groups.
42: * <p>
43: * The crosstab calculation engine can optimize the calculations
44: * if the data is sorted by the row groups and column groups.
45: * For example, if there are two row groups R1 and R2 (subgroup of R1)
46: * and three column groups C1, C2 and C3 the data should be sorted
47: * by R1, R2, C1, C2, C3.
48: *
49: * @return whether the crosstab data is pre-sorted
50: */
51: public boolean isDataPreSorted();
52: }
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