Source for org.jfree.report.expressions.ColumnAggregationExpression

   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: ColumnAggregationExpression.java 3525 2007-10-16 11:43:48Z tmorgner $
  27:  * ------------
  28:  * (C) Copyright 2000-2005, by Object Refinery Limited.
  29:  * (C) Copyright 2005-2007, by Pentaho Corporation.
  30:  */
  31: package org.jfree.report.expressions;
  32: 
  33: import org.jfree.report.DataSourceException;
  34: 
  35: /**
  36:  * Creation-Date: 04.01.2006, 17:23:01
  37:  *
  38:  * @author Thomas Morgner
  39:  */
  40: public abstract class ColumnAggregationExpression extends AbstractExpression
  41: {
  42:   protected ColumnAggregationExpression()
  43:   {
  44:   }
  45: 
  46:   protected abstract int getFieldListParameterPosition();
  47: 
  48:   protected Object[] getFieldValues() throws DataSourceException
  49:   {
  50:     return getFieldValues(Object.class);
  51:   }
  52: 
  53:   protected Object[] getFieldValues(final Class type) throws DataSourceException
  54:   {
  55:     return null; // todo
  56:   }
  57: 
  58: }