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JasperReports integration components and resources for Wicket.
/*
* $Id$ $Revision:
* 1.4 $ $Date$
*
* ==============================================================================
* Licensed under the Apache License, Version 2.0 (the "License"); you may not
* use this file except in compliance with the License. You may obtain a copy of
* the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations under
* the License.
*/
package org.wicketstuff.jasperreports;
import java.io.File;
import java.io.InputStream;
import java.net.URL;
import java.util.HashMap;
import java.util.Map;
import net.sf.jasperreports.engine.JRAbstractExporter;
import net.sf.jasperreports.engine.JRDataSource;
import net.sf.jasperreports.engine.JRException;
import net.sf.jasperreports.engine.JRExporterParameter;
import net.sf.jasperreports.engine.JasperFillManager;
import net.sf.jasperreports.engine.JasperPrint;
import net.sf.jasperreports.engine.JasperReport;
import net.sf.jasperreports.engine.util.JRLoader;
import org.apache.wicket.WicketRuntimeException;
import org.apache.wicket.request.resource.AbstractResource;
import org.apache.wicket.request.resource.ContentDisposition;
import org.apache.wicket.util.io.ByteArrayOutputStream;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* Base class for jasper reports resources.
*
* @author Eelco Hillenius
* @author Matej Knopp
* @author Luciano Montebove
*/
@SuppressWarnings("serial")
public abstract class JRResource extends AbstractResource
{
/**
* logger.
*/
private static Logger log = LoggerFactory.getLogger(JRResource.class);
/**
* the connection provider if any for filling this report.
*/
private IDatabaseConnectionProvider connectionProvider;
/**
* factory for delayed report creation.
*/
private IJasperReportFactory jasperReportFactory;
/**
* The compiled report this resource references. Made transient as we don't want our report to
* be serialized while we can recreate it at other servers at will using the factory.
*/
private transient JasperReport jasperReport;
/**
* the report parameters.
*/
private Map reportParameters;
/**
* the datasource if any for filling this report.
*/
private JRDataSource reportDataSource;
/**
* When set, a header 'Content-Disposition: attachment; filename="${fileName}"' will be added to
* the response, resulting in a download dialog. No magical extensions are added, so you should
* make sure the file has the extension you want yourself.
*/
private String fileName;
/**
* Construct without a report. You must provide a report before you can use this resource.
*/
public JRResource()
{
super();
}
/**
* Construct.
*
* @param report
* the report input stream
*/
public JRResource(final InputStream report)
{
this(new IJasperReportFactory()
{
public JasperReport newJasperReport() throws JRException
{
return (JasperReport)JRLoader.loadObject(report);
}
;
});
}
/**
* Construct.
*
* @param report
* the report input stream
*/
public JRResource(final URL report)
{
this(new IJasperReportFactory()
{
public JasperReport newJasperReport() throws JRException
{
return (JasperReport)JRLoader.loadObject(report);
}
;
});
}
/**
* Construct.
*
* @param report
* the report input stream
*/
public JRResource(final File report)
{
this(new IJasperReportFactory()
{
public JasperReport newJasperReport() throws JRException
{
return (JasperReport)JRLoader.loadObject(report);
}
;
});
}
/**
* Construct.
*
* @param factory
* report factory for lazy initialization
*/
public JRResource(IJasperReportFactory factory)
{
super();
jasperReportFactory = factory;
}
/**
* Gets jasperReport. This implementation uses an internal factory to lazily create the report.
* After creation the report is cached (set as the jasperReport property). Override this method
* in case you want to provide some alternative creation/ caching scheme.
*
* @return jasperReport
*/
public JasperReport getJasperReport()
{
// if the report has not yet been initialized and can be, initialize it
if (jasperReport == null && jasperReportFactory != null)
{
try
{
setJasperReport(jasperReportFactory.newJasperReport());
}
catch (JRException e)
{
throw new WicketRuntimeException(e);
}
}
return jasperReport;
}
/**
* Sets {bjasperReport.
*
* @param report
* report
*/
public final void setJasperReport(JasperReport report)
{
jasperReport = report;
}
/**
* Gets the report parameters. Returns a new copy of the reportParameters Map as JasperReports
* modifies it with not serializable objects
*
* @return report parameters
*/
public Map getReportParameters()
{
return new HashMap(reportParameters);
}
/**
* Sets the report parameters.
*
* @param params
* report parameters
*
* @return This
*/
public final JRResource setReportParameters(Map params)
{
reportParameters = params;
return this;
}
/**
* Gets the datasource if any for filling this report.
*
* @return the datasource if any for filling this report
*/
public JRDataSource getReportDataSource()
{
return reportDataSource;
}
/**
* Sets the datasource if any for filling this report.
*
* @param dataSource
* the datasource if any for filling this report
*
* @return This
*/
public JRResource setReportDataSource(JRDataSource dataSource)
{
reportDataSource = dataSource;
return this;
}
/**
* Gets the connection provider if any for filling this report.
*
* @return the connection provider if any for filling this report
*/
public IDatabaseConnectionProvider getConnectionProvider()
{
return connectionProvider;
}
/**
* Sets the connection provider if any for filling this report.
*
* @param provider
* the connection provider if any for filling this report
*
* @return This
*/
public final JRResource setConnectionProvider(IDatabaseConnectionProvider provider)
{
connectionProvider = provider;
return this;
}
/**
* Gets the file name. When set, a header 'Content-Disposition: attachment;
* filename="${fileName}"' will be added to the response, resulting in a download dialog. No
* magical extensions are added, so you should make sure the file has the extension you want
* yourself.
*
* @return the file name
*/
public String getFileName()
{
if (fileName == null)
{
fileName = getJasperReport().getName() + "." + getExtension();
}
return fileName;
}
/**
* Sets the file name. When set, a header 'Content-Disposition: attachment; filename="${name}"'
* will be added to the response, resulting in a download dialog. No magical extensions are
* added, so you should make sure the file has the extension you want yourself.
*
* @param name
* the file name
*
* @return This
*/
public final JRResource setFileName(String name)
{
fileName = name;
return this;
}
/**
* Called by getData to obtain an exporter instance.
*
* @return an exporter instance
*/
public abstract JRAbstractExporter newExporter();
/**
* @return The content type of the reports
*/
public abstract String getContentType();
/**
* The default is to return the content as an attachment.
*
* @return The content disposition of the reports
*/
public ContentDisposition getContentDisposition()
{
return ContentDisposition.ATTACHMENT;
}
/**
* Returns the extension for the resource's file. This string should not contain the leading "."
*
* @return The extension for the resource's file.
*/
public abstract String getExtension();
/**
* Creates a new {@link JasperPrint} instance. This instance is specific for this render, but it
* not yet designated for one output format only.
*
* @return a new {@link JasperPrint} instance.
*
* @throws JRException
*/
protected JasperPrint newJasperPrint() throws JRException
{
final JasperPrint jasperPrint;
JasperReport report = getJasperReport();
Map params = getReportParameters();
JRDataSource dataSource = getReportDataSource();
if (dataSource != null)
{
jasperPrint = JasperFillManager.fillReport(report, params, dataSource);
}
else
{
IDatabaseConnectionProvider provider = null;
try
{
provider = getConnectionProvider();
if (provider == null)
{
throw new IllegalStateException(
"JasperReportsResources must either have a JRDataSource, "
+ "or a JDBC Connection provided");
}
jasperPrint = JasperFillManager.fillReport(report, params, provider.get());
}
finally
{
if (provider != null)
{
provider.release();
}
}
}
return jasperPrint;
}
@Override
protected ResourceResponse newResourceResponse(Attributes attributes)
{
ResourceResponse resp = new ResourceResponse();
resp.disableCaching();
resp.setContentType(getContentType());
resp.setFileName(getFileName());
resp.setContentDisposition(getContentDisposition());
if (resp.dataNeedsToBeWritten(attributes))
{
resp.setWriteCallback(new WriteCallback()
{
@Override
public void writeData(Attributes attributes)
{
try
{
long t1 = System.currentTimeMillis();
// get a print instance for exporting
JasperPrint print = newJasperPrint();
// get a fresh instance of an exporter for this report
JRAbstractExporter exporter = newExporter();
final byte[] data = getExporterData(print, exporter);
attributes.getResponse().write(data);
if (log.isDebugEnabled())
{
long t2 = System.currentTimeMillis();
log.debug("loaded report data; bytes: " + data.length + " in " +
(t2 - t1) + " miliseconds");
}
}
catch (JRException e)
{
throw new WicketRuntimeException(e);
}
}
});
}
return resp;
}
protected byte[] getExporterData(JasperPrint print, JRAbstractExporter exporter)
throws JRException
{
// prepare a stream to trap the exporter's output
ByteArrayOutputStream baos = new ByteArrayOutputStream();
exporter.setParameter(JRExporterParameter.JASPER_PRINT, print);
exporter.setParameter(JRExporterParameter.OUTPUT_STREAM, baos);
// execute the export and return the trapped result
exporter.exportReport();
return baos.toByteArray();
}
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