@SuppressWarnings("serial")
public class MyBundleProperties implements IBundleProperties {

  /**
   * Returns a map with definitions of bundle configuration parameters. Key is the parameter name, value is a bundle
   * parameter definition of type {@link IBundleConfigParam}.
   * @param resHelper ResourceHelper to determine i18n values from the plugin bundle, if they exists.
   * @param currentLocale the current locale
   * @return {@link Map} with objects of type {@link IBundleConfigParam} or <code>null</code>.
   */
  @Override
  public Map<String, IBundleConfigParam> getConfigProperties(IPluginResourceHelper resHelper, Locale currentLocale) {
    Map<String, IBundleConfigParam> config = new LinkedHashMap<>();
    config.put("Group", new BundleConfigGroupItem("Supported parameters:"));
    config.put("Parameter1", new BundleConfigParam("Parameter1", "Mandatory parameter in scope of plugin with default value", true, "Default value"));
    config.put("Parameter2", new BundleConfigParam("Parameter2", "Mandatory parameter in the scope of the plug-in", true));
    config.put("Parameter3", new BundleConfigParam("Parameter3", "Parameter in scope of plug-in with default value", false, "Initial value"));
    config.put("Parameter4", new BundleConfigParam("Parameter4", "Parameter in scope of plugin", false));
    return config;
  }

}

public class MyPreRenderer implements IPluginFormPreRender {

  private Properties bundleProperties = null;

  /**
   * Name which makes plugin uniquely identifiable.
   */
  @Override
  public String getName() {
    return "My PreRenderer";
  }

  /**
   * Plugin lifecycle method, which is called when the object instance is created.
   */
  @Override
  public void initialize(IPluginInitializeData initializeData) throws FCPluginException {
    bundleProperties = initializeData.getProperties();
  }

  /**
   * Method for executing plugin logic.
   */
  @Override
  public IPluginFormPreRenderRetVal execute(IPluginFormPreRenderParams params) throws FCPluginException {
    // Read bundle property 'activate.form.alias'.
    Set<String> alias = getConfiguredFormAlias("activate.form.alias");

    // Is PreRender plugin enabled for current form instance?
    IExtendedFormRequestContext ctx = (IExtendedFormRequestContext)params.getFormRequestContext();
    if (!alias.contains(ctx.getProject().getName())) {
      // no form activation found -> cancel processing
      return new PluginFormPreRenderRetVal(Collections.EMPTY_MAP, true);
    }

    // further PreRender implementation
    // ....

    return new PluginFormPreRenderRetVal(Collections.EMPTY_MAP, true);
  }

  /**
   * Function to determine a bundle property value.
   * The determined value is separated by a comma 
   * and returned as a HashSet.
   * @param propertyName
   * @return a {@link HashSet}
   */
  protected Set<String> getConfiguredFormAlias(String propertyName) {
    String formAlias = bundleProperties.getProperty(propertyName, null);
    if (XStringUtils.isBlank(formAlias)) { return Collections.emptySet(); }
    String[] arr = XStringUtils.split(formAlias, ",");
    return new HashSet<String>(Arrays.asList(arr));
  }
}