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.engine; 29 30 31 /** 32 * This interface represents the abstract representation of a JasperReports data source. All data source types must 33 * implement this interface. 34 * <p> 35 * JasperReports provides default implementations of result set, bean collections and bean arrays data sources. 36 * @author Teodor Danciu (teodord@users.sourceforge.net) 37 * @version $Id: JRDataSource.java 1229 2006-04-19 13:27:35 +0300 (Wed, 19 Apr 2006) teodord $ 38 */ 39 public interface JRDataSource 40 { 41 42 43 /** 44 * Tries to position the cursor on the next element in the data source. 45 * @return true if there is a next record, false otherwise 46 * @throws JRException if any error occurs while trying to move to the next element 47 */ 48 public boolean next() throws JRException; 49 50 /** 51 * Gets the field value for the current position. 52 * @return an object containing the field value. The object type must be the field object type. 53 */ 54 public Object getFieldValue(JRField jrField) throws JRException; 55 56 57 } 58