Source for org.jfree.report.modules.factories.report.flow.GroupReadHandler

   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: GroupReadHandler.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.modules.factories.report.flow;
  32: 
  33: import org.jfree.report.structure.Element;
  34: import org.jfree.report.structure.Group;
  35: import org.jfree.xmlns.parser.XmlReadHandler;
  36: import org.jfree.xmlns.parser.ParseException;
  37: import org.xml.sax.Attributes;
  38: import org.xml.sax.SAXException;
  39: 
  40: /**
  41:  * Creation-Date: 09.04.2006, 15:37:31
  42:  *
  43:  * @author Thomas Morgner
  44:  */
  45: public class GroupReadHandler extends SectionReadHandler
  46: {
  47:   private Group group;
  48:   private GroupingExpressionReadHandler groupingExpressionReadHandler;
  49: 
  50:   public GroupReadHandler()
  51:   {
  52:     group = new Group();
  53:   }
  54: 
  55:   /**
  56:    * Returns the handler for a child element.
  57:    *
  58:    * @param tagName the tag name.
  59:    * @param atts    the attributes.
  60:    * @return the handler or null, if the tagname is invalid.
  61:    * @throws SAXException       if there is a parsing error.
  62:    */
  63:   protected XmlReadHandler getHandlerForChild(final String uri,
  64:                                               final String tagName,
  65:                                               final Attributes atts)
  66:       throws SAXException
  67:   {
  68:     final XmlReadHandler base = super.getHandlerForChild(uri, tagName, atts);
  69:     if (base != null)
  70:     {
  71:       return base;
  72:     }
  73:     if (FlowReportFactoryModule.NAMESPACE.equals(uri))
  74:     {
  75:       if ("grouping-expression".equals(tagName))
  76:       {
  77:         groupingExpressionReadHandler = new GroupingExpressionReadHandler();
  78:         return groupingExpressionReadHandler;
  79:       }
  80:     }
  81:     return null;
  82:   }
  83: 
  84:   /**
  85:    * Done parsing.
  86:    *
  87:    * @throws SAXException       if there is a parsing error.
  88:    */
  89:   protected void doneParsing() throws SAXException
  90:   {
  91:     if (groupingExpressionReadHandler == null)
  92:     {
  93:       throw new ParseException
  94:           ("Required element 'grouping-expression' is missing.", getLocator());
  95:     }
  96: 
  97:     super.doneParsing();
  98:     final Group group = (Group) getElement();
  99:     group.setGroupingExpression(groupingExpressionReadHandler.getExpression());
 100:   }
 101: 
 102:   protected Element getElement()
 103:   {
 104:     return group;
 105:   }
 106: }