Source for org.jfree.report.EmptyReportDataFactory

   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: EmptyReportDataFactory.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: 
  32: package org.jfree.report;
  33: 
  34: /**
  35:  * Creation-Date: 17.11.2006, 16:51:01
  36:  *
  37:  * @author Thomas Morgner
  38:  */
  39: public class EmptyReportDataFactory implements ReportDataFactory
  40: {
  41:   public EmptyReportDataFactory()
  42:   {
  43:   }
  44: 
  45:   public void open()
  46:   {
  47: 
  48:   }
  49: 
  50:   /**
  51:    * Queries a datasource. The string 'query' defines the name of the query. The
  52:    * Parameterset given here may contain more data than actually needed.
  53:    * <p/>
  54:    * The dataset may change between two calls, do not assume anything!
  55:    *
  56:    * @param query
  57:    * @param parameters
  58:    * @return
  59:    */
  60:   public ReportData queryData(final String query, final DataSet parameters)
  61:       throws ReportDataFactoryException
  62:   {
  63:     return new EmptyReportData();
  64:   }
  65: 
  66:   /**
  67:    * Closes the report data factory and all report data instances that have been
  68:    * returned by this instance.
  69:    */
  70:   public void close()
  71:   {
  72: 
  73:   }
  74: 
  75: 
  76:   /**
  77:    * Derives a freshly initialized report data factory, which is independend of
  78:    * the original data factory. Opening or Closing one data factory must not
  79:    * affect the other factories.
  80:    *
  81:    * @return
  82:    */
  83:   public ReportDataFactory derive()
  84:   {
  85:     return this;
  86:   }
  87: }