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1: /** 2: * ======================================== 3: * JFreeReport : a free Java report library 4: * ======================================== 5: * 6: * Project Info: http://reporting.pentaho.org/ 7: * 8: * (C) Copyright 2000-2007, by Object Refinery Limited, Pentaho Corporation and Contributors. 9: * 10: * This library is free software; you can redistribute it and/or modify it under the terms 11: * of the GNU Lesser General Public License as published by the Free Software Foundation; 12: * either 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, but WITHOUT ANY WARRANTY; 15: * without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. 16: * See the GNU Lesser General Public License for more details. 17: * 18: * You should have received a copy of the GNU Lesser General Public License along with this 19: * library; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, 20: * Boston, MA 02111-1307, USA. 21: * 22: * [Java is a trademark or registered trademark of Sun Microsystems, Inc. 23: * in the United States and other countries.] 24: * 25: * ------------ 26: * $Id: ReportDataFactory.java 2725 2007-04-01 18:49:29Z taqua $ 27: * ------------ 28: * (C) Copyright 2000-2005, by Object Refinery Limited. 29: * (C) Copyright 2005-2007, by Pentaho Corporation. 30: */ 31: package org.jfree.report; 32: 33: /** 34: * The report data-factory is responsible for querying the data from arbitary 35: * datasources. 36: * 37: * @author Thomas Morgner 38: */ 39: public interface ReportDataFactory 40: { 41: public void open(); 42: 43: /** 44: * Queries a datasource. The string 'query' defines the name of the query. 45: * The Parameterset given here may contain more data than actually needed. 46: * 47: * The dataset may change between two calls, do not assume anything! 48: * 49: * @param query 50: * @param parameters 51: * @return 52: */ 53: public ReportData queryData (final String query, final DataSet parameters) 54: throws ReportDataFactoryException; 55: 56: /** 57: * Closes the report data factory and all report data instances that have 58: * been returned by this instance. 59: */ 60: public void close(); 61: 62: /** 63: * Derives a freshly initialized report data factory, which is independend 64: * of the original data factory. Opening or Closing one data factory must not 65: * affect the other factories. 66: * 67: * @return 68: */ 69: public ReportDataFactory derive (); 70: }