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: ContentElementLayoutController.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 org.jfree.report.DataFlags; 035 import org.jfree.report.DataSourceException; 036 import org.jfree.report.ReportDataFactoryException; 037 import org.jfree.report.ReportProcessingException; 038 import org.jfree.report.data.DefaultDataFlags; 039 import org.jfree.report.expressions.Expression; 040 import org.jfree.report.flow.FlowController; 041 import org.jfree.report.flow.LayoutExpressionRuntime; 042 import org.jfree.report.flow.ReportContext; 043 import org.jfree.report.flow.ReportTarget; 044 import org.jfree.report.structure.ContentElement; 045 import org.jfree.report.structure.Node; 046 047 /** 048 * Creation-Date: 24.11.2006, 15:06:56 049 * 050 * @author Thomas Morgner 051 */ 052 public class ContentElementLayoutController extends ElementLayoutController 053 { 054 public ContentElementLayoutController() 055 { 056 } 057 058 protected LayoutController processContent(final ReportTarget target) 059 throws DataSourceException, ReportProcessingException, ReportDataFactoryException 060 { 061 062 final Node node = getElement(); 063 final FlowController flowController = getFlowController(); 064 final LayoutExpressionRuntime er = 065 LayoutControllerUtil.getExpressionRuntime(flowController, node); 066 final ContentElement element = (ContentElement) node; 067 final Expression ex = element.getValueExpression(); 068 final Object value; 069 070 if (ex != null) 071 { 072 try 073 { 074 ex.setRuntime(er); 075 value = ex.computeValue(); 076 } 077 finally 078 { 079 ex.setRuntime(null); 080 } 081 } 082 else 083 { 084 value = null; 085 } 086 087 // This should be a very rare case indeed .. 088 if (value instanceof DataFlags) 089 { 090 target.processContent((DataFlags) value); 091 092 final ContentElementLayoutController derived = (ContentElementLayoutController) clone(); 093 derived.setProcessingState(ElementLayoutController.FINISHING); 094 derived.setFlowController(flowController); 095 return derived; 096 } 097 098 if (value instanceof Node) 099 { 100 // we explictly allow structural content here. 101 // As this might be a very expensive thing, if we 102 // keep it in a single state, we continue on a separate state. 103 final Node valueNode = (Node) value; 104 valueNode.updateParent(node.getParent()); 105 final ReportContext reportContext = flowController.getReportContext(); 106 final LayoutControllerFactory layoutControllerFactory = 107 reportContext.getLayoutControllerFactory(); 108 109 // actually, this is the same as if the element were a 110 // child element of a section. The only difference is 111 // that there can be only one child, and that there is no 112 // direct parent-child direction. 113 114 final ContentElementLayoutController derived = 115 (ContentElementLayoutController) clone(); 116 derived.setProcessingState(ElementLayoutController.WAITING_FOR_JOIN); 117 derived.setFlowController(flowController); 118 119 return layoutControllerFactory.create 120 (flowController, valueNode, derived); 121 } 122 123 if (ex != null) 124 { 125 target.processContent (new DefaultDataFlags(ex.getName(), value, true)); 126 } 127 128 final ContentElementLayoutController derived = (ContentElementLayoutController) clone(); 129 derived.setProcessingState(ElementLayoutController.FINISHING); 130 derived.setFlowController(flowController); 131 return derived; 132 } 133 134 /** 135 * Joins with a delegated process flow. This is generally called from a child 136 * flow and should *not* (I mean it!) be called from outside. If you do, 137 * you'll suffer. 138 * 139 * @param flowController the flow controller of the parent. 140 * @return the joined layout controller that incorperates all changes from 141 * the delegate. 142 */ 143 public LayoutController join(final FlowController flowController) 144 { 145 final ContentElementLayoutController derived = (ContentElementLayoutController) clone(); 146 derived.setProcessingState(ElementLayoutController.FINISHING); 147 derived.setFlowController(flowController); 148 return derived; 149 } 150 }