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: GroupReadHandler.java,v 1.6 2007/04/01 18:49:27 taqua Exp $
027 * ------------
028 * (C) Copyright 2000-2005, by Object Refinery Limited.
029 * (C) Copyright 2005-2007, by Pentaho Corporation.
030 */
031 package org.jfree.report.modules.factories.report.flow;
032
033 import org.jfree.report.structure.Element;
034 import org.jfree.report.structure.Group;
035 import org.jfree.xmlns.parser.XmlReadHandler;
036 import org.jfree.xmlns.parser.ParseException;
037 import org.xml.sax.Attributes;
038 import org.xml.sax.SAXException;
039
040 /**
041 * Creation-Date: 09.04.2006, 15:37:31
042 *
043 * @author Thomas Morgner
044 */
045 public class GroupReadHandler extends SectionReadHandler
046 {
047 private Group group;
048 private GroupingExpressionReadHandler groupingExpressionReadHandler;
049
050 public GroupReadHandler()
051 {
052 group = new Group();
053 }
054
055 /**
056 * Returns the handler for a child element.
057 *
058 * @param tagName the tag name.
059 * @param atts the attributes.
060 * @return the handler or null, if the tagname is invalid.
061 * @throws SAXException if there is a parsing error.
062 */
063 protected XmlReadHandler getHandlerForChild(final String uri,
064 final String tagName,
065 final Attributes atts)
066 throws SAXException
067 {
068 XmlReadHandler base = super.getHandlerForChild(uri, tagName, atts);
069 if (base != null)
070 {
071 return base;
072 }
073 if (FlowReportFactoryModule.NAMESPACE.equals(uri))
074 {
075 if ("grouping-expression".equals(tagName))
076 {
077 groupingExpressionReadHandler = new GroupingExpressionReadHandler();
078 return groupingExpressionReadHandler;
079 }
080 }
081 return null;
082 }
083
084 /**
085 * Done parsing.
086 *
087 * @throws SAXException if there is a parsing error.
088 */
089 protected void doneParsing() throws SAXException
090 {
091 if (groupingExpressionReadHandler == null)
092 {
093 throw new ParseException
094 ("Required element 'grouping-expression' is missing.", getLocator());
095 }
096
097 super.doneParsing();
098 Group group = (Group) getElement();
099 group.setGroupingExpression(groupingExpressionReadHandler.getExpression());
100 }
101
102 protected Element getElement()
103 {
104 return group;
105 }
106 }