SeamReports Example Usage

gistfile1.java

@Qualifier
public @interface Selected {
}

@RequestScoped
public class ReportOptions {

    public String reportName;
    public String format;

}

@ApplicationScoped
public class ReportInitialiser {

    @Inject EntityManager em;
    @Inject @JasperReports SeamReportLoader reportLoader;

    public Map<String, SeamReport> compiledReports = new HashMap<String, SeamReport>();

    // can non-extentions do this?
    public void loadMappings(@Observes AfterBeanValidation e) {
        List<ReportDetail> allReportDetails = em.findAll(ReportDetail.class);
        for (ReportDetail reportDetail : allReportDetails) {
            compileReport(reportDetail);
        }
    }

    public void compileReport(@Observes @Modified ReportDetail reportDetail) {
        SeamReport report = reportLoader.compile(reportDetail.getPath());
        compiledReports.put(reportDetail.getName(), report);
    }
    
    @Produces @ApplicationScoped
    public SeamReportDataSource produceDataSource(DataSource defaultDataSource) {
        return new SeamReportDataSource(defaultDataSource);
    }

    @Produces @RequestScoped @Selected
    public SeamReportInstance produceAppropriateReport(ReportOptions reportOptions, SeamReportDataSource reportDataSource) {
        SeamReport report = compiledReports.get(reportOptions.reportName);
        return report.fill(reportDataSource);
    }
    
}

public class ReportServlet {

    @Inject @Selected SeamReportInstance reportInstance;
    @Inject ReportOptions reportOptions;

    public void execute(Request req, Response resp) {
        SeamReportOutputType outputType = SeamReportOutputType.forName(reportOptions.reportName);
        if (reportInstance.isOutputTypeSupported(outputType)) {
            reportInstance.render(outputType, resp.getOutputStream());
        } else {
            throw new Wobbly();
        }
    }

}