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: EmptyReportDataFactory.java 2725 2007-04-01 18:49:29Z taqua $ 027 * ------------ 028 * (C) Copyright 2000-2005, by Object Refinery Limited. 029 * (C) Copyright 2005-2007, by Pentaho Corporation. 030 */ 031 032 package org.jfree.report; 033 034 /** 035 * Creation-Date: 17.11.2006, 16:51:01 036 * 037 * @author Thomas Morgner 038 */ 039 public class EmptyReportDataFactory implements ReportDataFactory 040 { 041 public EmptyReportDataFactory() 042 { 043 } 044 045 public void open() 046 { 047 048 } 049 050 /** 051 * Queries a datasource. The string 'query' defines the name of the query. The 052 * Parameterset given here may contain more data than actually needed. 053 * <p/> 054 * The dataset may change between two calls, do not assume anything! 055 * 056 * @param query 057 * @param parameters 058 * @return 059 */ 060 public ReportData queryData(final String query, final DataSet parameters) 061 throws ReportDataFactoryException 062 { 063 return new EmptyReportData(); 064 } 065 066 /** 067 * Closes the report data factory and all report data instances that have been 068 * returned by this instance. 069 */ 070 public void close() 071 { 072 073 } 074 075 076 /** 077 * Derives a freshly initialized report data factory, which is independend of 078 * the original data factory. Opening or Closing one data factory must not 079 * affect the other factories. 080 * 081 * @return 082 */ 083 public ReportDataFactory derive() 084 { 085 return this; 086 } 087 }