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,v 1.5 2007/04/01 18:49:24 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.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(PrecomputeNodeKey element)
059 {
060 PrecomputeNodeImpl newNode = new PrecomputeNodeImpl (element);
061 if (node != null)
062 {
063 newNode.setParent(node);
064 }
065 node = newNode;
066 }
067
068 public void finishElement(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 }