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.engine;
29:
30: /**
31: * This interface represents the abstract representation of a JasperReports data source. All data source types must
32: * implement this interface.
33: * <p>
34: * JasperReports provides default implementations of result set, bean collections and bean arrays data sources.
35: * @author Teodor Danciu (teodord@users.sourceforge.net)
36: * @version $Id: JRDataSource.java 1229 2006-04-19 10:27:35Z teodord $
37: */
38: public interface JRDataSource {
39:
40: /**
41: * Tries to position the cursor on the next element in the data source.
42: * @return true if there is a next record, false otherwise
43: * @throws JRException if any error occurs while trying to move to the next element
44: */
45: public boolean next() throws JRException;
46:
47: /**
48: * Gets the field value for the current position.
49: * @return an object containing the field value. The object type must be the field object type.
50: */
51: public Object getFieldValue(JRField jrField) throws JRException;
52:
53: }
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