/*
* JasperReports - Free Java Reporting Library.
* Copyright (C) 2001 - 2009 Jaspersoft Corporation. All rights reserved.
* http://www.jaspersoft.com
*
* Unless you have purchased a commercial license agreement from Jaspersoft,
* the following license terms apply:
*
* This program is part of JasperReports.
*
* JasperReports 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 3 of the License, or
* (at your option) any later version.
*
* JasperReports 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 JasperReports. If not, see <http://www.gnu.org/licenses/>.
*/
package net.sf.jasperreports.engine.fill;
import java.util.HashMap;
import java.util.Map;
import net.sf.jasperreports.engine.JRDataset;
import net.sf.jasperreports.engine.JRException;
import net.sf.jasperreports.engine.JRGroup;
import net.sf.jasperreports.engine.JRParameter;
import net.sf.jasperreports.engine.JasperReport;
/**
* Utility class to be used to evaluate parameter default value expressions for a report
* without actually filling it.
*
* @author Lucian Chirita (lucianc@users.sourceforge.net)
* @version $Id: JRParameterDefaultValuesEvaluator.java 3713 2010-04-08 11:06:05Z teodord $
*/
public final class JRParameterDefaultValuesEvaluator
{
/**
* Evaluates the default values for the parameters of a report.
*
* @param report the report
* @param initialParameters initial parameter value map
* @return a map containing parameter values indexed by parameter names
* @throws JRException
*/
public static Map evaluateParameterDefaultValues(JasperReport report, Map initialParameters) throws JRException
{
Map valuesMap = initialParameters == null ? new HashMap() : new HashMap(initialParameters);
valuesMap.put(JRParameter.JASPER_REPORT, report);
ObjectFactory factory = new ObjectFactory();
JRDataset reportDataset = report.getMainDataset();
JRFillDataset fillDataset = factory.getDataset(reportDataset);
fillDataset.createCalculator(report);
fillDataset.initCalculator();
JRResourcesFillUtil.ResourcesFillContext resourcesContext =
JRResourcesFillUtil.setResourcesFillContext(valuesMap);
try
{
fillDataset.setParameterValues(valuesMap);
Map parameterValues = new HashMap();
JRParameter[] parameters = reportDataset.getParameters();
for (int i = 0; i < parameters.length; i++)
{
JRParameter param = parameters[i];
if (!param.isSystemDefined())
{
String name = param.getName();
Object value = fillDataset.getParameterValue(name);
parameterValues.put(name, value);
}
}
return parameterValues;
}
finally
{
JRResourcesFillUtil.revertResourcesFillContext(resourcesContext);
}
}
protected static class ObjectFactory extends JRFillObjectFactory
{
protected ObjectFactory()
{
super((JRBaseFiller) null, null);
}
protected JRFillGroup getGroup(JRGroup group)
{
return super.getGroup(null);
}
}
private JRParameterDefaultValuesEvaluator()
{
}
}