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: DatasourceFactoryReadHandler.java 2725 2007-04-01 18:49:29Z taqua $
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.ReportDataFactory;
034    import org.jfree.report.modules.factories.data.base.DataFactoryReadHandler;
035    import org.jfree.resourceloader.Resource;
036    import org.jfree.resourceloader.ResourceCreationException;
037    import org.jfree.resourceloader.ResourceKey;
038    import org.jfree.resourceloader.ResourceKeyCreationException;
039    import org.jfree.resourceloader.ResourceLoadingException;
040    import org.jfree.resourceloader.ResourceManager;
041    import org.jfree.resourceloader.ResourceException;
042    import org.jfree.xmlns.parser.AbstractXmlReadHandler;
043    import org.jfree.xmlns.parser.ParseException;
044    import org.xml.sax.Attributes;
045    import org.xml.sax.SAXException;
046    
047    /**
048     * Creation-Date: 10.04.2006, 13:27:47
049     *
050     * @author Thomas Morgner
051     */
052    public class DatasourceFactoryReadHandler extends AbstractXmlReadHandler
053      implements DataFactoryReadHandler
054    {
055      private ReportDataFactory dataFactory;
056    
057      public DatasourceFactoryReadHandler()
058      {
059      }
060    
061      /**
062       * Starts parsing.
063       *
064       * @param attrs the attributes.
065       * @throws SAXException if there is a parsing error.
066       */
067      protected void startParsing(final Attributes attrs) throws SAXException
068      {
069        super.startParsing(attrs);
070        final String href = attrs.getValue(getUri(), "href");
071        if (href == null)
072        {
073          throw new ParseException("Required attribute 'href' is missing.", getLocator());
074        }
075        final ResourceKey key = getRootHandler().getSource();
076        final ResourceManager manager = getRootHandler().getResourceManager();
077        try
078        {
079          final ResourceKey derivedKey = manager.deriveKey(key, href);
080          final Resource resource = manager.create(derivedKey, null, ReportDataFactory.class);
081          getRootHandler().getDependencyCollector().add(resource);
082          dataFactory = (ReportDataFactory) resource.getResource();
083        }
084        catch (ResourceKeyCreationException e)
085        {
086          throw new ParseException
087              ("Unable to derive key for " + key + " and " + href, getLocator());
088        }
089        catch (ResourceCreationException e)
090        {
091          throw new ParseException
092              ("Unable to parse resource for " + key + " and " + href, getLocator());
093        }
094        catch (ResourceLoadingException e)
095        {
096          throw new ParseException
097              ("Unable to load resource data for " + key + " and " + href, getLocator());
098        }
099        catch (ResourceException e)
100        {
101          throw new ParseException("Unable to parse resource for " + key + " and " + href, getLocator());
102        }
103      }
104    
105      public ReportDataFactory getDataFactory()
106      {
107        return dataFactory;
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 is a parsing error.
116       */
117      public Object getObject() throws SAXException
118      {
119        return dataFactory;
120      }
121    }