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: DefaultLayoutControllerFactory.java,v 1.7 2007/04/01 18:49:25 taqua Exp $
027 * ------------
028 * (C) Copyright 2000-2005, by Object Refinery Limited.
029 * (C) Copyright 2005-2007, by Pentaho Corporation.
030 */
031
032 package org.jfree.report.flow.layoutprocessor;
033
034 import java.util.HashMap;
035 import java.util.Iterator;
036
037 import org.jfree.report.DataSourceException;
038 import org.jfree.report.ReportDataFactoryException;
039 import org.jfree.report.ReportProcessingException;
040 import org.jfree.report.flow.FlowController;
041 import org.jfree.report.flow.ReportJob;
042 import org.jfree.report.structure.Node;
043 import org.jfree.util.Configuration;
044 import org.jfree.util.ObjectUtilities;
045
046 /**
047 * A layout controller factory that selects layout controllers by their node
048 * implementation type.
049 *
050 * @author Thomas Morgner
051 */
052 public class DefaultLayoutControllerFactory implements LayoutControllerFactory
053 {
054 private HashMap registry;
055 private static final String PREFIX = "org.jfree.report.flow.structure.";
056
057 public DefaultLayoutControllerFactory()
058 {
059 registry = new HashMap();
060
061 }
062
063 public void initialize (final ReportJob job)
064 {
065 final Configuration configuration = job.getConfiguration();
066
067 final Iterator propertyKeys =
068 configuration.findPropertyKeys(DefaultLayoutControllerFactory.PREFIX);
069 while (propertyKeys.hasNext())
070 {
071 final String key = (String) propertyKeys.next();
072 final String nodeClassName = key.substring
073 (DefaultLayoutControllerFactory.PREFIX.length());
074 final String procClassName = configuration.getConfigProperty(key);
075
076 final Class nodeClass = load(nodeClassName);
077 final Object processor = ObjectUtilities.loadAndInstantiate
078 (procClassName, DefaultLayoutControllerFactory.class, LayoutController.class);
079 if (nodeClass == null || processor == null)
080 {
081 // sanity check ..
082 continue;
083 }
084
085 registry.put(nodeClassName, procClassName);
086 }
087 }
088
089 private Class load (final String className)
090 {
091 if (className == null)
092 {
093 return null;
094 }
095
096 final ClassLoader classLoader = ObjectUtilities.getClassLoader
097 (DefaultLayoutControllerFactory.class);
098 try
099 {
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 }