/*
* This program is free software; you can redistribute it and/or modify it under the
* terms of the GNU Lesser General Public License, version 2.1 as published by the Free Software
* Foundation.
*
* You should have received a copy of the GNU Lesser General Public License along with this
* program; if not, you can obtain a copy at http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html
* or from the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*
* This program 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.
*
* Copyright (c) 2001 - 2009 Object Refinery Ltd, Pentaho Corporation and Contributors.. All rights reserved.
*/
package org.pentaho.reporting.engine.classic.core.function.sys;
import java.io.IOException;
import java.sql.Clob;
import java.sql.SQLException;
import java.util.Iterator;
import java.util.Map;
import org.pentaho.reporting.engine.classic.core.Band;
import org.pentaho.reporting.engine.classic.core.Element;
import org.pentaho.reporting.engine.classic.core.Group;
import org.pentaho.reporting.engine.classic.core.ReportDefinition;
import org.pentaho.reporting.engine.classic.core.RootLevelBand;
import org.pentaho.reporting.engine.classic.core.SubReport;
import org.pentaho.reporting.engine.classic.core.ReportElement;
import org.pentaho.reporting.engine.classic.core.event.ReportEvent;
import org.pentaho.reporting.engine.classic.core.function.AbstractElementFormatFunction;
import org.pentaho.reporting.engine.classic.core.function.Expression;
import org.pentaho.reporting.engine.classic.core.function.FunctionUtilities;
import org.pentaho.reporting.engine.classic.core.function.StructureFunction;
import org.pentaho.reporting.engine.classic.core.states.LayoutProcess;
import org.pentaho.reporting.engine.classic.core.style.ElementStyleSheet;
import org.pentaho.reporting.engine.classic.core.style.StyleKey;
import org.pentaho.reporting.engine.classic.core.util.beans.ConverterRegistry;
import org.pentaho.reporting.engine.classic.core.util.beans.ValueConverter;
import org.pentaho.reporting.libraries.base.util.LFUMap;
import org.pentaho.reporting.libraries.base.util.IOUtils;
import org.pentaho.reporting.libraries.formula.ErrorValue;
/**
* Evaluates style-expressions and updates the stylesheet. This is an internal helper function. It is not meant to be
* used by end-users and manually adding this function to a report will cause funny side-effects.
*
* @author Thomas Morgner
*/
public class StyleExpressionsEvaluator extends AbstractElementFormatFunction
implements StructureFunction
{
private static class NeedEvalResult
{
private boolean needToRun;
private long changeTracker;
private NeedEvalResult(final boolean needToRun, final long changeTracker)
{
this.needToRun = needToRun;
this.changeTracker = changeTracker;
}
public boolean isNeedToRun()
{
return needToRun;
}
public long getChangeTracker()
{
return changeTracker;
}
}
private LFUMap expressionsCache;
/**
* Default Constructor.
*/
public StyleExpressionsEvaluator()
{
expressionsCache = new LFUMap(500);
}
/**
* Receives notification that report generation initializes the current run. <P> The event carries a
* ReportState.Started state. Use this to initialize the report.
*
* @param event The event.
*/
public void reportInitialized(final ReportEvent event)
{
if (FunctionUtilities.isLayoutLevel(event) == false)
{
// dont do anything if there is no printing done ...
return;
}
super.reportInitialized(event);
if (event.getState().isSubReportEvent() == false)
{
// only evaluate master-reports. Subreports are evaluated when their parent-band is evaluated.
final ReportDefinition definition = event.getReport();
evaluateElement(definition);
}
}
/**
* Evaluates all style expressions from all elements and updates the style-sheet if needed.
*
* @param b the band.
*/
protected void processRootBand(final Band b)
{
final NeedEvalResult needToRun = (NeedEvalResult) expressionsCache.get(b.getObjectID());
if (needToRun != null)
{
if (needToRun.isNeedToRun() == false)
{
if (b.getChangeTracker() == needToRun.getChangeTracker())
{
return;
}
}
}
final boolean needToRunVal = processBand(b);
expressionsCache.put(b.getObjectID(), new NeedEvalResult(needToRunVal, b.getChangeTracker()));
}
private boolean processBand(final Band b)
{
boolean hasStyleExpressions = evaluateElement(b);
if (b.isVisible() == false)
{
return hasStyleExpressions;
}
final Element[] elementBuffer = b.unsafeGetElementArray();
final int length = elementBuffer.length;
for (int i = 0; i < length; i++)
{
final Element element = elementBuffer[i];
if (element instanceof Band)
{
if (processBand((Band) element))
{
hasStyleExpressions = true;
}
}
else
{
if (evaluateElement(element))
{
hasStyleExpressions = true;
}
}
}
if (b instanceof RootLevelBand)
{
final RootLevelBand rlb = (RootLevelBand) b;
final SubReport[] reports = rlb.getSubReports();
for (int i = 0; i < reports.length; i++)
{
final SubReport subReport = reports[i];
if (evaluateElement(subReport))
{
hasStyleExpressions = true;
}
}
}
return hasStyleExpressions;
}
public int getProcessingPriority()
{
return 10000;
}
protected void processGroup(final Group group)
{
evaluateElement(group);
processRootBand(group.getHeader());
evaluateElement(group.getBody());
}
/**
* Evaluates all defined style-expressions of the given element.
*
* @param e the element that should be updated.
* @return true, if the element has style-expressions, or false otherwise.
*/
protected boolean evaluateElement(final ReportElement e)
{
final Map styleExpressions = e.getStyleExpressions();
if (styleExpressions.isEmpty())
{
return false;
}
boolean retval = false;
final ElementStyleSheet style = e.getStyle();
final Iterator entries = styleExpressions.entrySet().iterator();
while (entries.hasNext())
{
final Map.Entry entry = (Map.Entry) entries.next();
final StyleKey key = (StyleKey) entry.getKey();
final Expression ex = (Expression) entry.getValue();
if (ex == null)
{
continue;
}
retval = true;
ex.setRuntime(getRuntime());
try
{
final Object value = evaluate(ex);
if (value == null)
{
style.setStyleProperty(key, null);
}
else if (key.getValueType().isInstance(value))
{
style.setStyleProperty(key, value);
}
else if (value instanceof ErrorValue)
{
style.setStyleProperty(key, null);
}
else
{
final ValueConverter valueConverter = ConverterRegistry.getInstance().getValueConverter(key.getValueType());
if (valueConverter != null)
{
// try to convert it ..
final Object o = ConverterRegistry.toPropertyValue(String.valueOf(value), key.getValueType());
style.setStyleProperty(key, o);
}
else
{
style.setStyleProperty(key, null);
}
}
}
catch (Exception exception)
{
// ignored, but we clear the style as we have no valid value anymore.
style.setStyleProperty(key, null);
}
finally
{
ex.setRuntime(null);
}
}
return retval;
}
private Object evaluate(final Expression ex)
{
final Object retval = ex.getValue();
if (retval instanceof Clob)
{
try
{
return IOUtils.getInstance().readClob((Clob) retval);
}
catch (Exception e)
{
return null;
}
}
return retval;
}
/**
* Returns the dependency level for the expression (controls evaluation order for expressions and functions).
*
* @return the level.
*/
public int getDependencyLevel()
{
return LayoutProcess.LEVEL_PAGINATE;
}
public Expression getInstance()
{
final StyleExpressionsEvaluator eval = (StyleExpressionsEvaluator) super.getInstance();
eval.expressionsCache = new LFUMap(500);
return eval;
}
}