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: PrecomputedValueRegistryBuilder.java 3525 2007-10-16 11:43:48Z tmorgner $
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.data;
033    
034    /**
035     * This class is currently very primitive and enforces a recomputation of
036     * precomputed values each time.
037     *
038     * @author Thomas Morgner
039     */
040    public class PrecomputedValueRegistryBuilder implements PrecomputedValueRegistry
041    {
042      private PrecomputeNodeImpl node;
043    
044      public PrecomputedValueRegistryBuilder()
045      {
046      }
047    
048      public void startElementPrecomputation(final PrecomputeNodeKey element)
049      {
050        startElement(element);
051      }
052    
053      public void finishElementPrecomputation(final PrecomputeNodeKey element)
054      {
055        finishElement(element);
056      }
057    
058      public void startElement(final PrecomputeNodeKey element)
059      {
060        final PrecomputeNodeImpl newNode = new PrecomputeNodeImpl (element);
061        if (node != null)
062        {
063          newNode.setParent(node);
064        }
065        node = newNode;
066      }
067    
068      public void finishElement(final PrecomputeNodeKey element)
069      {
070        node = (PrecomputeNodeImpl) node.getParent();
071      }
072    
073      public PrecomputeNode currentNode()
074      {
075        return node;
076      }
077    
078      public void addFunction(final String name, final Object value)
079      {
080        node.addFunction(name, value);
081      }
082    }