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 3048 2007-07-28 18:02:42Z tmorgner $ 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 }