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

   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: DatasourceFactoryReadHandler.java 2725 2007-04-01 18:49:29Z taqua $
  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.ReportDataFactory;
  34: import org.jfree.report.modules.factories.data.base.DataFactoryReadHandler;
  35: import org.jfree.resourceloader.Resource;
  36: import org.jfree.resourceloader.ResourceCreationException;
  37: import org.jfree.resourceloader.ResourceKey;
  38: import org.jfree.resourceloader.ResourceKeyCreationException;
  39: import org.jfree.resourceloader.ResourceLoadingException;
  40: import org.jfree.resourceloader.ResourceManager;
  41: import org.jfree.resourceloader.ResourceException;
  42: import org.jfree.xmlns.parser.AbstractXmlReadHandler;
  43: import org.jfree.xmlns.parser.ParseException;
  44: import org.xml.sax.Attributes;
  45: import org.xml.sax.SAXException;
  46: 
  47: /**
  48:  * Creation-Date: 10.04.2006, 13:27:47
  49:  *
  50:  * @author Thomas Morgner
  51:  */
  52: public class DatasourceFactoryReadHandler extends AbstractXmlReadHandler
  53:   implements DataFactoryReadHandler
  54: {
  55:   private ReportDataFactory dataFactory;
  56: 
  57:   public DatasourceFactoryReadHandler()
  58:   {
  59:   }
  60: 
  61:   /**
  62:    * Starts parsing.
  63:    *
  64:    * @param attrs the attributes.
  65:    * @throws SAXException if there is a parsing error.
  66:    */
  67:   protected void startParsing(final Attributes attrs) throws SAXException
  68:   {
  69:     super.startParsing(attrs);
  70:     final String href = attrs.getValue(getUri(), "href");
  71:     if (href == null)
  72:     {
  73:       throw new ParseException("Required attribute 'href' is missing.", getLocator());
  74:     }
  75:     final ResourceKey key = getRootHandler().getSource();
  76:     final ResourceManager manager = getRootHandler().getResourceManager();
  77:     try
  78:     {
  79:       final ResourceKey derivedKey = manager.deriveKey(key, href);
  80:       final Resource resource = manager.create(derivedKey, null, ReportDataFactory.class);
  81:       getRootHandler().getDependencyCollector().add(resource);
  82:       dataFactory = (ReportDataFactory) resource.getResource();
  83:     }
  84:     catch (ResourceKeyCreationException e)
  85:     {
  86:       throw new ParseException
  87:           ("Unable to derive key for " + key + " and " + href, getLocator());
  88:     }
  89:     catch (ResourceCreationException e)
  90:     {
  91:       throw new ParseException
  92:           ("Unable to parse resource for " + key + " and " + href, getLocator());
  93:     }
  94:     catch (ResourceLoadingException e)
  95:     {
  96:       throw new ParseException
  97:           ("Unable to load resource data for " + key + " and " + href, getLocator());
  98:     }
  99:     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: }