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,v 1.3 2007/04/01 18:49:23 taqua Exp $
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 }