/**
* ===========================================
* LibLayout : a free Java layouting library
* ===========================================
*
* Project Info: http://reporting.pentaho.org/liblayout/
*
* (C) Copyright 2006-2007, by 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: StreamingRenderer.java 3524 2007-10-16 11:26:31Z tmorgner $
* ------------
* (C) Copyright 2006-2007, by Pentaho Corporation.
*/
package org.jfree.layouting.renderer;
import org.jfree.layouting.LayoutProcess;
import org.jfree.layouting.State;
import org.jfree.layouting.StateException;
import org.jfree.layouting.StatefullComponent;
import org.jfree.layouting.input.style.PseudoPage;
import org.jfree.layouting.layouter.context.LayoutStyle;
import org.jfree.layouting.layouter.context.PageContext;
import org.jfree.layouting.normalizer.content.NormalizationException;
import org.jfree.layouting.output.OutputProcessor;
import org.jfree.layouting.renderer.model.page.LogicalPageBox;
import org.jfree.layouting.renderer.process.CleanStreamedBoxesStep;
import org.jfree.layouting.renderer.process.ComputeBreakabilityStep;
import org.jfree.layouting.renderer.process.ComputeICMMetricsStep;
import org.jfree.layouting.renderer.process.ComputeMarginsStep;
import org.jfree.layouting.renderer.process.ComputeStaticPropertiesStep;
import org.jfree.layouting.renderer.process.ComputeTableICMMetricsStep;
import org.jfree.layouting.renderer.process.InfiniteMajorAxisLayoutStep;
import org.jfree.layouting.renderer.process.InfiniteMinorAxisLayoutStep;
import org.jfree.layouting.renderer.process.ParagraphLineBreakStep;
import org.jfree.layouting.renderer.process.SimplePaginationStep;
import org.jfree.layouting.renderer.process.TableRowHeightStep;
import org.jfree.layouting.renderer.process.TableValidationStep;
import org.jfree.layouting.renderer.process.ValidateModelStep;
import org.jfree.layouting.renderer.process.UpdateTokensStep;
import org.jfree.util.Log;
/**
* A renderer which builds a streaming page model.
*
* @author Thomas Morgner
*/
public class StreamingRenderer extends AbstractRenderer
{
protected static class DefaultFlowRendererState extends RendererState
{
private ValidateModelStep validateModelStep;
private TableValidationStep tableValidationStep;
private ComputeStaticPropertiesStep staticPropertiesStep;
private ComputeMarginsStep marginsStep;
private ComputeICMMetricsStep icmMetricsStep;
private ComputeTableICMMetricsStep tableICMMetricsStep;
private ParagraphLineBreakStep paragraphLinebreakStep;
private InfiniteMinorAxisLayoutStep minorAxisLayoutStep;
private InfiniteMajorAxisLayoutStep majorAxisLayoutStep;
private TableRowHeightStep tableRowHeightStep;
private ComputeBreakabilityStep breakabilityStep;
private SimplePaginationStep paginationStep;
private CleanStreamedBoxesStep cleanBoxesStep;
private UpdateTokensStep updateTokensStep;
protected DefaultFlowRendererState(final StreamingRenderer renderer)
throws StateException
{
super(renderer);
this.validateModelStep = renderer.validateModelStep;
this.tableValidationStep = renderer.tableValidationStep;
this.staticPropertiesStep = renderer.staticPropertiesStep;
this.marginsStep = renderer.marginsStep;
this.icmMetricsStep = renderer.icmMetricsStep;
this.tableICMMetricsStep = renderer.tableICMMetricsStep;
this.paragraphLinebreakStep = renderer.paragraphLinebreakStep;
this.minorAxisLayoutStep = renderer.minorAxisLayoutStep;
this.majorAxisLayoutStep = renderer.majorAxisLayoutStep;
this.tableRowHeightStep = renderer.tableRowHeightStep;
this.breakabilityStep = renderer.breakabilityStep;
this.paginationStep = renderer.paginationStep;
this.cleanBoxesStep = renderer.cleanBoxesStep;
this.updateTokensStep = renderer.updateTokensStep;
}
/**
* Creates a restored instance of the saved component.
* <p/>
* By using this factory-like approach, we gain independence from having to
* know the actual implementation. This makes things a lot easier.
*
* @param layoutProcess the layout process that controls it all
* @return the saved state
* @throws StateException
*/
public StatefullComponent restore(final LayoutProcess layoutProcess)
throws StateException
{
final StreamingRenderer defaultRenderer = new StreamingRenderer(layoutProcess, false);
fill(defaultRenderer, layoutProcess);
defaultRenderer.validateModelStep = this.validateModelStep;
defaultRenderer.tableValidationStep = this.tableValidationStep;
defaultRenderer.staticPropertiesStep = this.staticPropertiesStep;
defaultRenderer.marginsStep = this.marginsStep;
defaultRenderer.icmMetricsStep = this.icmMetricsStep;
defaultRenderer.tableICMMetricsStep = this.tableICMMetricsStep;
defaultRenderer.paragraphLinebreakStep = this.paragraphLinebreakStep;
defaultRenderer.minorAxisLayoutStep = this.minorAxisLayoutStep;
defaultRenderer.majorAxisLayoutStep = this.majorAxisLayoutStep;
defaultRenderer.tableRowHeightStep = this.tableRowHeightStep;
defaultRenderer.paginationStep = this.paginationStep;
defaultRenderer.cleanBoxesStep = this.cleanBoxesStep;
defaultRenderer.breakabilityStep = this.breakabilityStep;
defaultRenderer.updateTokensStep = this.updateTokensStep;
return defaultRenderer;
}
}
private ValidateModelStep validateModelStep;
private TableValidationStep tableValidationStep;
private ComputeStaticPropertiesStep staticPropertiesStep;
private ComputeMarginsStep marginsStep;
private ComputeICMMetricsStep icmMetricsStep;
private ComputeTableICMMetricsStep tableICMMetricsStep;
private ParagraphLineBreakStep paragraphLinebreakStep;
private InfiniteMinorAxisLayoutStep minorAxisLayoutStep;
private InfiniteMajorAxisLayoutStep majorAxisLayoutStep;
private TableRowHeightStep tableRowHeightStep;
private ComputeBreakabilityStep breakabilityStep;
private SimplePaginationStep paginationStep;
private CleanStreamedBoxesStep cleanBoxesStep;
private UpdateTokensStep updateTokensStep;
protected StreamingRenderer(final LayoutProcess layoutProcess,
final boolean init)
{
super(layoutProcess, init);
if (init)
{
this.validateModelStep = new ValidateModelStep();
this.staticPropertiesStep = new ComputeStaticPropertiesStep();
this.tableValidationStep = new TableValidationStep();
this.marginsStep = new ComputeMarginsStep();
this.paragraphLinebreakStep = new ParagraphLineBreakStep();
this.icmMetricsStep = new ComputeICMMetricsStep();
this.tableICMMetricsStep = new ComputeTableICMMetricsStep();
this.minorAxisLayoutStep = new InfiniteMinorAxisLayoutStep();
this.majorAxisLayoutStep = new InfiniteMajorAxisLayoutStep();
this.tableRowHeightStep = new TableRowHeightStep();
this.breakabilityStep = new ComputeBreakabilityStep();
this.paginationStep = new SimplePaginationStep();
this.cleanBoxesStep = new CleanStreamedBoxesStep();
this.updateTokensStep = new UpdateTokensStep();
}
}
public StreamingRenderer(final LayoutProcess layoutProcess)
{
this(layoutProcess, true);
}
/**
* Todo: Using this renderer with an non-iterative output processor results
* in trouble!
*
* @throws NormalizationException
*/
protected void validateOutput() throws NormalizationException
{
final OutputProcessor outputProcessor = getLayoutProcess().getOutputProcessor();
final LogicalPageBox logicalPageBox = getLogicalPageBox();
if (outputProcessor.getMetaData().isIterative() == false)
{
if (logicalPageBox.isOpen())
{
return;
}
}
if (validateModelStep.isLayoutable(logicalPageBox) == false)
{
return;
}
tableValidationStep.validate(logicalPageBox);
updateTokensStep.compute
(logicalPageBox, getLayoutProcess(), getPageContext());
staticPropertiesStep.compute(logicalPageBox);
marginsStep.compute(logicalPageBox);
paragraphLinebreakStep.compute(logicalPageBox);
icmMetricsStep.compute(logicalPageBox);
tableICMMetricsStep.compute(logicalPageBox);
minorAxisLayoutStep.compute(logicalPageBox);
majorAxisLayoutStep.compute(logicalPageBox);
tableRowHeightStep.compute(logicalPageBox);
breakabilityStep.compute(logicalPageBox);
paginationStep.performPagebreak(logicalPageBox);
// A new page has been started. Recover the page-grid, then restart
// everything from scratch. (We have to recompute, as the pages may
// be different now, due to changed margins or page definitions)
outputProcessor.processContent(logicalPageBox);
// Now fire the pagebreak. This goes through all layers and informs all
// components, that a pagebreak has been encountered and possibly a
// new page has been set. It does not save the state or perform other
// expensive operations. However, it updates the 'isPagebreakEncountered'
// flag, which will be active until the input-feed received a new event.
if (logicalPageBox.isOpen())
{
Log.debug ("PAGEBREAK ENCOUNTERED");
firePagebreak();
cleanBoxesStep.compute(logicalPageBox);
}
else
{
Log.debug ("DOCUMENT FINISHED");
outputProcessor.processingFinished();
}
}
protected void firePagebreak() throws NormalizationException
{
// todo: Compute the current page and the pseudo-pages for this one.
final PageContext pageContext = getRenderPageContext().getPageContext();
final LayoutStyle style = pageContext.getStyle();
// todo: Update the pseudo-pages (left | right, first)
getLayoutProcess().pageBreakEncountered(null, new PseudoPage[0]);
}
public State saveState() throws StateException
{
return new DefaultFlowRendererState(this);
}
}