package org.jboss.seam.pdf.birt;
 
import java.io.IOException;
import java.io.InputStream;
import java.util.Properties;
import java.util.logging.Level;
 
import javax.servlet.ServletContext;
 
import org.eclipse.birt.core.exception.BirtException;
import org.eclipse.birt.core.framework.IPlatformContext;
import org.eclipse.birt.core.framework.Platform;
import org.eclipse.birt.core.framework.PlatformServletContext;
import org.eclipse.birt.report.engine.api.EngineConfig;
import org.eclipse.birt.report.engine.api.IReportEngine;
import org.eclipse.birt.report.engine.api.IReportEngineFactory;
 
public class BirtEngine {
 
	private static IReportEngine birtEngine = null;
 
	private static Properties configProps = new Properties();
 
	private final static String configFile = "BirtConfig.properties";
 
	public static synchronized void initBirtConfig() {
		loadEngineProps();
	}
 
	public static synchronized IReportEngine getBirtEngine(ServletContext sc) {
		if (birtEngine == null) {
			EngineConfig config = new EngineConfig();
			if (configProps != null) {
				String logLevel = configProps.getProperty("logLevel");
				Level level = Level.OFF;
				if ("SEVERE".equalsIgnoreCase(logLevel)) {
					level = Level.SEVERE;
				} else if ("WARNING".equalsIgnoreCase(logLevel)) {
					level = Level.WARNING;
				} else if ("INFO".equalsIgnoreCase(logLevel)) {
					level = Level.INFO;
				} else if ("CONFIG".equalsIgnoreCase(logLevel)) {
					level = Level.CONFIG;
				} else if ("FINE".equalsIgnoreCase(logLevel)) {
					level = Level.FINE;
				} else if ("FINER".equalsIgnoreCase(logLevel)) {
					level = Level.FINER;
				} else if ("FINEST".equalsIgnoreCase(logLevel)) {
					level = Level.FINEST;
				} else if ("OFF".equalsIgnoreCase(logLevel)) {
					level = Level.OFF;
				}
 
				config.setLogConfig(configProps.getProperty("logDirectory"),
						level);
			}
 
			config.setEngineHome("");
			IPlatformContext context = new PlatformServletContext(sc);
			config.setPlatformContext(context);
 
			try {
				Platform.startup(config);
			} catch (BirtException e) {
				e.printStackTrace();
			}
 
			IReportEngineFactory factory = (IReportEngineFactory) Platform
					.createFactoryObject(IReportEngineFactory.EXTENSION_REPORT_ENGINE_FACTORY);
			birtEngine = factory.createReportEngine(config);
 
		}
		return birtEngine;
	}
 
	public static synchronized void destroyBirtEngine() {
		if (birtEngine == null) {
			return;
		}
		birtEngine.shutdown();
		Platform.shutdown();
		birtEngine = null;
	}
 
	public Object clone() throws CloneNotSupportedException {
		throw new CloneNotSupportedException();
	}
 
	private static void loadEngineProps() {
		try {
			// Config File must be in classpath
			ClassLoader cl = Thread.currentThread().getContextClassLoader();
			InputStream in = null;
			in = cl.getResourceAsStream(configFile);
			configProps.load(in);
			in.close();
 
		} catch (IOException e) {
			e.printStackTrace();
		}
 
	}
 
}

package org.jboss.seam.pdf.birt;
 
import java.io.IOException;
 
public class DocumentStoreServlet extends HttpServlet {
	protected IReportEngine engine;
	protected IFragment requester;
 
	private static final long serialVersionUID = 519600274155718202L;
 
	public void init(ServletConfig servletconfig) throws ServletException {
		super.init(servletconfig);
		BirtEngine.initBirtConfig();
	}
 
	@Override
	protected void doGet(final HttpServletRequest request,
			final HttpServletResponse response) throws ServletException,
			IOException {
 
		new ContextualHttpServletRequest(request) {
			@Override
			public void process() throws ServletException, IOException {
				try {
					executeReport( request, response);
				} catch (EngineException e) {
					log("executeReport error", e);
				}
 
			}
		}.run();
 
	}
 
 
	void executeReport(HttpServletRequest request, HttpServletResponse response) throws EngineException {
 
        //resp.setContentType("text/html");
        response.setContentType( "application/pdf" ); 
        response.setHeader ("Content-Disposition","inline; filename=test.pdf");           
        String reportName = request.getServletPath();
        ServletContext sc = request.getSession().getServletContext();
        this.engine = BirtEngine.getBirtEngine(sc);
 
 
        IReportRunnable design;
        try
        {
                //Open report design
       		design = engine.openReportDesign( sc.getRealPath("./")+reportName.substring(0, reportName.length() -4) + ".xhtml" );
                //create task to run and render report
                IRunAndRenderTask task = engine.createRunAndRenderTask( design );             
                task.getAppContext().put(EngineConstants.APPCONTEXT_CLASSLOADER_KEY, DocumentStoreServlet.class.getClassLoader()); 
                //set output options
                //HTMLRenderOption options = new HTMLRenderOption();
                PDFRenderOption options = new PDFRenderOption();
                //options.setOutputFormat(HTMLRenderOption.OUTPUT_FORMAT_HTML);
                options.setOutputFormat(HTMLRenderOption.OUTPUT_FORMAT_PDF);
                options.setOutputStream(response.getOutputStream());
                //options.setBaseImageURL(req.getContextPath()+"/images");
                //options.setImageDirectory(sc.getRealPath("/images"));
                task.setRenderOption(options);
 
                //run report
                task.run();
                task.close();
        }catch (IOException e){
 
                e.printStackTrace();
                return;
        }
 
 
		System.out.println("Finished");
	}
 
	/**
	 * Destruction of the servlet. 
 
	 */
	public void destroy() {
	 super.destroy(); 
	 BirtEngine.destroyBirtEngine();
	}
}