/**
* ========================================
* JFreeReport : a free Java report library
* ========================================
*
* Project Info: http://reporting.pentaho.org/
*
* (C) Copyright 2000-2007, by Object Refinery Limited, Pentaho Corporation and Contributors.
*
* This library is free software; you can redistribute it and/or modify it under the terms
* of the GNU Lesser General Public License as published by the Free Software Foundation;
* either version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
* without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
* See the GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License along with this
* library; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
* Boston, MA 02111-1307, USA.
*
* [Java is a trademark or registered trademark of Sun Microsystems, Inc.
* in the United States and other countries.]
*
* ------------
* $Id: ContentElementLayoutController.java 6659 2008-12-02 15:35:06Z tmorgner $
* ------------
* (C) Copyright 2000-2005, by Object Refinery Limited.
* (C) Copyright 2005-2007, by Pentaho Corporation.
*/
package org.jfree.report.flow.layoutprocessor;
import org.jfree.report.DataFlags;
import org.jfree.report.DataSourceException;
import org.jfree.report.ReportDataFactoryException;
import org.jfree.report.ReportProcessingException;
import org.jfree.report.data.DefaultDataFlags;
import org.jfree.report.expressions.Expression;
import org.jfree.report.flow.FlowController;
import org.jfree.report.flow.LayoutExpressionRuntime;
import org.jfree.report.flow.ReportContext;
import org.jfree.report.flow.ReportTarget;
import org.jfree.report.structure.ContentElement;
import org.jfree.report.structure.Node;
/**
* Creation-Date: 24.11.2006, 15:06:56
*
* @author Thomas Morgner
*/
public class ContentElementLayoutController extends ElementLayoutController
{
public ContentElementLayoutController()
{
}
protected LayoutController processContent(final ReportTarget target)
throws DataSourceException, ReportProcessingException, ReportDataFactoryException
{
final Node node = getElement();
final FlowController flowController = getFlowController();
final LayoutExpressionRuntime er =
LayoutControllerUtil.getExpressionRuntime(flowController, node);
final ContentElement element = (ContentElement) node;
final Expression ex = element.getValueExpression();
final Object value;
if (ex != null)
{
try
{
ex.setRuntime(er);
value = ex.computeValue();
}
finally
{
ex.setRuntime(null);
}
}
else
{
value = null;
}
// This should be a very rare case indeed ..
if (value instanceof DataFlags)
{
target.processContent((DataFlags) value);
final ContentElementLayoutController derived = (ContentElementLayoutController) clone();
derived.setProcessingState(ElementLayoutController.FINISHING);
derived.setFlowController(flowController);
return derived;
}
if (value instanceof Node)
{
// we explictly allow structural content here.
// As this might be a very expensive thing, if we
// keep it in a single state, we continue on a separate state.
final Node valueNode = (Node) value;
valueNode.updateParent(node.getParent());
final ReportContext reportContext = flowController.getReportContext();
final LayoutControllerFactory layoutControllerFactory =
reportContext.getLayoutControllerFactory();
// actually, this is the same as if the element were a
// child element of a section. The only difference is
// that there can be only one child, and that there is no
// direct parent-child direction.
final ContentElementLayoutController derived =
(ContentElementLayoutController) clone();
derived.setProcessingState(ElementLayoutController.WAITING_FOR_JOIN);
derived.setFlowController(flowController);
return layoutControllerFactory.create
(flowController, valueNode, derived);
}
if (ex != null)
{
target.processContent (new DefaultDataFlags(ex.getName(), value, true));
}
final ContentElementLayoutController derived = (ContentElementLayoutController) clone();
derived.setProcessingState(ElementLayoutController.FINISHING);
derived.setFlowController(flowController);
return derived;
}
/**
* Joins with a delegated process flow. This is generally called from a child
* flow and should *not* (I mean it!) be called from outside. If you do,
* you'll suffer.
*
* @param flowController the flow controller of the parent.
* @return the joined layout controller that incorperates all changes from
* the delegate.
*/
public LayoutController join(final FlowController flowController)
{
final ContentElementLayoutController derived = (ContentElementLayoutController) clone();
derived.setProcessingState(ElementLayoutController.FINISHING);
derived.setFlowController(flowController);
return derived;
}
}