/*
* 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.io.File;
import java.io.InputStream;
import java.net.URL;
import net.sf.jasperreports.engine.JRException;
import net.sf.jasperreports.engine.JRExpression;
import net.sf.jasperreports.engine.JRReportTemplate;
import net.sf.jasperreports.engine.JRRuntimeException;
import net.sf.jasperreports.engine.JRTemplate;
import net.sf.jasperreports.engine.xml.JRXmlTemplateLoader;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
/**
* Fill-time {@link JRReportTemplate} implementation.
* <p/>
* Used to evaluate template source expressions.
*
* @author Lucian Chirita (lucianc@users.sourceforge.net)
* @version $Id: JRFillReportTemplate.java 3659 2010-03-31 10:20:49Z shertage $
*/
public class JRFillReportTemplate implements JRReportTemplate
{
private static final Log log = LogFactory.getLog(JRFillReportTemplate.class);
private final JRReportTemplate parent;
private final JRBaseFiller filler;
public JRFillReportTemplate(JRReportTemplate template, JRBaseFiller filler, JRFillObjectFactory factory)
{
factory.put(template, this);
parent = template;
this.filler = filler;
}
public JRExpression getSourceExpression()
{
return parent.getSourceExpression();
}
public JRTemplate evaluate() throws JRException
{
JRTemplate template;
JRExpression sourceExpression = getSourceExpression();
Object source = filler.evaluateExpression(sourceExpression, JRExpression.EVALUATION_DEFAULT);
if (source == null)
{
template = null;
}
else
{
Class sourceType = sourceExpression.getValueClass();
if (JRTemplate.class.isAssignableFrom(sourceType))
{
template = (JRTemplate) source;
}
else
{
template = loadTemplate(source, sourceType, filler.fillContext);
}
}
return template;
}
protected static JRTemplate loadTemplate(Object source, Class sourceType, JRFillContext fillContext) throws JRException
{
JRTemplate template;
if (fillContext.hasLoadedTemplate(source))
{
template = fillContext.getLoadedTemplate(source);
}
else
{
if (log.isDebugEnabled())
{
log.debug("Loading styles template from " + source);
}
if (String.class.equals(sourceType))
{
template = JRXmlTemplateLoader.load((String) source);
}
else if (File.class.isAssignableFrom(sourceType))
{
template = JRXmlTemplateLoader.load((File) source);
}
else if (URL.class.isAssignableFrom(sourceType))
{
template = JRXmlTemplateLoader.load((URL) source);
}
else if (InputStream.class.isAssignableFrom(sourceType))
{
template = JRXmlTemplateLoader.load((InputStream) source);
}
else
{
throw new JRRuntimeException("Unknown template source class " + sourceType.getName());
}
fillContext.registerLoadedTemplate(source, template);
}
return template;
}
}