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: ContentElementReadHandler.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    package org.jfree.report.modules.factories.report.flow;
032    
033    import org.jfree.report.structure.ContentElement;
034    import org.jfree.report.structure.Element;
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, 14:38:32
042     *
043     * @author Thomas Morgner
044     */
045    public class ContentElementReadHandler extends AbstractElementReadHandler
046    {
047      private ValueExpressionReadHandler valueExpressionReadHandler;
048      private ContentElement ce;
049    
050      public ContentElementReadHandler()
051      {
052        ce = new ContentElement();
053      }
054    
055      /**
056       * Starts parsing.
057       *
058       * @param attrs the attributes.
059       * @throws org.xml.sax.SAXException if there is a parsing error.
060       */
061      protected void startParsing(final Attributes attrs) throws SAXException
062      {
063        super.startParsing(attrs);
064        final String format = attrs.getValue(FlowReportFactoryModule.NAMESPACE, "format");
065        ce.setAttribute(FlowReportFactoryModule.NAMESPACE, "format", format);
066      }
067    
068      /**
069       * Returns the handler for a child element.
070       *
071       * @param tagName the tag name.
072       * @param atts    the attributes.
073       * @return the handler or null, if the tagname is invalid.
074       * @throws SAXException       if there is a parsing error.
075       */
076      protected XmlReadHandler getHandlerForChild(final String uri,
077                                                  final String tagName,
078                                                  final Attributes atts)
079              throws SAXException
080      {
081        if (isSameNamespace(uri) == false)
082        {
083          return null;
084        }
085        if ("value-expression".equals(tagName))
086        {
087          valueExpressionReadHandler = new ValueExpressionReadHandler();
088          return valueExpressionReadHandler;
089        }
090        return super.getHandlerForChild(uri, tagName, atts);
091      }
092    
093      /**
094       * Done parsing.
095       *
096       * @throws SAXException       if there is a parsing error.
097       */
098      protected void doneParsing() throws SAXException
099      {
100        if (valueExpressionReadHandler == null)
101        {
102          throw new ParseException("No valid value expression.", getLocator());
103        }
104    
105        super.doneParsing();
106        configureElement(ce);
107        ce.setValueExpression(valueExpressionReadHandler.getExpression());
108      }
109    
110      /**
111       * Returns the object for this element or null, if this element does not
112       * create an object.
113       *
114       * @return the object.
115       * @throws SAXException if there's a parsing error
116       */
117      public Object getObject() throws SAXException
118      {
119        return ce;
120      }
121    
122      protected Element getElement()
123      {
124        return ce;
125      }
126    }