Java 类net.sf.jasperreports.engine.ParameterContributorFactory 实例源码

/**
 *
 */
private List<ParameterContributor> getParameterContributors(ParameterContributorContext context) throws JRException
{
    List<ParameterContributor> allContributors = null;
    List<?> factories = getJasperReportsContext().getExtensions(ParameterContributorFactory.class);
    if (factories != null && factories.size() > 0)
    {
        allContributors = new ArrayList<ParameterContributor>();
        for (Iterator<?> it = factories.iterator(); it.hasNext();)
        {
            ParameterContributorFactory factory = (ParameterContributorFactory)it.next();
            List<ParameterContributor> contributors = factory.getContributors(context);
            if (contributors != null)
            {
                allContributors.addAll(contributors);
            }
        }
    }
    return allContributors;
}

public void init()
{
    jasperReportsContext = new SimpleJasperReportsContext();
    // for some reason data adapter extensions are not registered by default
    jasperReportsContext.setExtensions(ParameterContributorFactory.class, 
            Collections.singletonList(DataAdapterParameterContributorFactory.getInstance()));
    jasperReportsContext.setExtensions(DataFileServiceFactory.class, 
            Collections.singletonList(BuiltinDataFileServiceFactory.instance()));

    try
    {
        compileReport();
        readReferenceDigest();
    }
    catch (JRException | IOException | NoSuchAlgorithmException e)
    {
        throw new RuntimeException(e);
    }
}