001 /** 002 * ======================================== 003 * JFreeReport : a free Java report library 004 * ======================================== 005 * 006 * Project Info: http://reporting.pentaho.org/ 007 * 008 * (C) Copyright 2000-2007, by Object Refinery Limited, Pentaho Corporation and Contributors. 009 * 010 * This library is free software; you can redistribute it and/or modify it under the terms 011 * of the GNU Lesser General Public License as published by the Free Software Foundation; 012 * either version 2.1 of the License, or (at your option) any later version. 013 * 014 * This library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; 015 * without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. 016 * See the GNU Lesser General Public License for more details. 017 * 018 * You should have received a copy of the GNU Lesser General Public License along with this 019 * library; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, 020 * Boston, MA 02111-1307, USA. 021 * 022 * [Java is a trademark or registered trademark of Sun Microsystems, Inc. 023 * in the United States and other countries.] 024 * 025 * ------------ 026 * $Id: ReportDataFactory.java 3048 2007-07-28 18:02:42Z tmorgner $ 027 * ------------ 028 * (C) Copyright 2000-2005, by Object Refinery Limited. 029 * (C) Copyright 2005-2007, by Pentaho Corporation. 030 */ 031 package org.jfree.report; 032 033 /** 034 * The report data-factory is responsible for querying the data from arbitary 035 * datasources. 036 * 037 * @author Thomas Morgner 038 */ 039 public interface ReportDataFactory 040 { 041 public void open(); 042 043 /** 044 * Queries a datasource. The string 'query' defines the name of the query. 045 * The Parameterset given here may contain more data than actually needed. 046 * 047 * The dataset may change between two calls, do not assume anything! 048 * 049 * @param query 050 * @param parameters 051 * @return 052 */ 053 public ReportData queryData (final String query, final DataSet parameters) 054 throws ReportDataFactoryException; 055 056 /** 057 * Closes the report data factory and all report data instances that have 058 * been returned by this instance. 059 */ 060 public void close(); 061 062 /** 063 * Derives a freshly initialized report data factory, which is independend 064 * of the original data factory. Opening or Closing one data factory must not 065 * affect the other factories. 066 * 067 * @return 068 */ 069 public ReportDataFactory derive (); 070 }