Source for org.jfree.report.flow.layoutprocessor.DefaultLayoutControllerFactory

   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: DefaultLayoutControllerFactory.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: 
  32: package org.jfree.report.flow.layoutprocessor;
  33: 
  34: import java.util.HashMap;
  35: import java.util.Iterator;
  36: 
  37: import org.jfree.report.DataSourceException;
  38: import org.jfree.report.ReportDataFactoryException;
  39: import org.jfree.report.ReportProcessingException;
  40: import org.jfree.report.flow.FlowController;
  41: import org.jfree.report.flow.ReportJob;
  42: import org.jfree.report.structure.Node;
  43: import org.jfree.util.Configuration;
  44: import org.jfree.util.ObjectUtilities;
  45: 
  46: /**
  47:  * A layout controller factory that selects layout controllers by their node
  48:  * implementation type.
  49:  *
  50:  * @author Thomas Morgner
  51:  */
  52: public class DefaultLayoutControllerFactory implements LayoutControllerFactory
  53: {
  54:   private HashMap registry;
  55:   private static final String PREFIX = "org.jfree.report.flow.structure.";
  56: 
  57:   public DefaultLayoutControllerFactory()
  58:   {
  59:     registry = new HashMap();
  60: 
  61:   }
  62: 
  63:   public void initialize (final ReportJob job)
  64:   {
  65:     final Configuration configuration = job.getConfiguration();
  66: 
  67:     final Iterator propertyKeys =
  68:         configuration.findPropertyKeys(DefaultLayoutControllerFactory.PREFIX);
  69:     while (propertyKeys.hasNext())
  70:     {
  71:       final String key = (String) propertyKeys.next();
  72:       final String nodeClassName = key.substring
  73:           (DefaultLayoutControllerFactory.PREFIX.length());
  74:       final String procClassName = configuration.getConfigProperty(key);
  75: 
  76:       final Class nodeClass = load(nodeClassName);
  77:       final Object processor = ObjectUtilities.loadAndInstantiate
  78:           (procClassName, DefaultLayoutControllerFactory.class, LayoutController.class);
  79:       if (nodeClass == null || processor == null)
  80:       {
  81:         // sanity check ..
  82:         continue;
  83:       }
  84: 
  85:       registry.put(nodeClassName, procClassName);
  86:     }
  87:   }
  88: 
  89:   private Class load (final String className)
  90:   {
  91:     if (className == null)
  92:     {
  93:       return null;
  94:     }
  95: 
  96:     final ClassLoader classLoader = ObjectUtilities.getClassLoader
  97:         (DefaultLayoutControllerFactory.class);
  98:     try
  99:     {
 100:       return classLoader.loadClass(className);
 101:     }
 102:     catch (ClassNotFoundException e)
 103:     {
 104:       return null;
 105:     }
 106:   }
 107: 
 108:   public LayoutController create(final FlowController controller,
 109:                                  final Object node,
 110:                                  final LayoutController parent)
 111:       throws ReportProcessingException, ReportDataFactoryException, DataSourceException
 112:   {
 113:     Class nodeClass = node.getClass();
 114:     while (Node.class.isAssignableFrom(nodeClass))
 115:     {
 116:       final String targetClass = (String) registry.get(nodeClass.getName());
 117:       if (targetClass != null)
 118:       {
 119:         final LayoutController lc = (LayoutController)
 120:             ObjectUtilities.loadAndInstantiate (targetClass,
 121:                 DefaultLayoutControllerFactory.class, LayoutController.class);
 122:         if (lc != null)
 123:         {
 124:           lc.initialize(node, controller, parent);
 125:           return lc;
 126:         }
 127:       }
 128:       nodeClass = nodeClass.getSuperclass();
 129:     }
 130: 
 131:     throw new ReportProcessingException("No processor for node " + node);
 132:   }
 133: }