/**
   * Configures a Digester
   *
   * @return Digester
   */
  private Digester getDigester() {

    final SaxErrorHandler errorHandler = new SaxErrorHandler();

    final Digester digester = new Digester();
    digester.setErrorHandler(errorHandler);
    digester.setValidating(true);
    digester.setEntityResolver(new DtdEntityResolver());

    return digester;
  }
  /**
   * Process a single <code>faces-config.xml</code> file and add all beans found to the supplied
   * list of {@link FacesConfigEntry} objects.
   *
   * @param url The faces-config.xml file
   * @param facesConfigEntries list of entries to add the beans to
   */
  private void processFacesConfig(URL url, List<FacesConfigEntry> facesConfigEntries) {

    // log name of current file
    if (log.isTraceEnabled()) {
      log.trace("Loading bean names from: " + url.toString());
    }

    // setup digester
    Digester digester = new Digester();

    /*
     * We use the context class loader to resolve classes.
     * This fixes ClassNotFoundExceptions on Geronimo.
     */
    digester.setUseContextClassLoader(true);

    // prevent downloading of DTDs
    digester.setEntityResolver(new EmptyEntityResolver());

    digester.setValidating(false);
    digester.push(facesConfigEntries);
    digester.addObjectCreate("faces-config/managed-bean", FacesConfigEntry.class);
    digester.addCallMethod("faces-config/managed-bean/managed-bean-name", "setName", 0);
    digester.addCallMethod("faces-config/managed-bean/managed-bean-class", "setBeanClass", 0);
    digester.addSetNext("faces-config/managed-bean", "add");

    // stream used to read faces-config.xml file
    InputStream stream = null;

    try {
      // open the file and let digester pares it
      stream = url.openStream();
      digester.parse(stream);

    } catch (IOException e) {
      // may be thrown when reading the file
      log.error("Failed to parse: " + url.toString(), e);
    } catch (SAXException e) {
      // parsing errors
      log.error("Failed to parse: " + url.toString(), e);
    } finally {
      // close stream
      if (stream != null) {
        try {
          stream.close();
        } catch (IOException e) {
          // ignore IOExceptions on close
        }
      }
    }
  }
  /**
   * Initializes the digester.
   *
   * @param useContextClassLoader whether or not to use the context class loader.
   * @param validating whether or not to validate XML.
   * @param validatingSchema whether or not to validate XML schema.
   */
  protected void initDigester(
      boolean useContextClassLoader, boolean validating, boolean validatingSchema) {
    digester = new Digester();
    digester.setNamespaceAware(true);
    digester.setUseContextClassLoader(useContextClassLoader);
    digester.setValidating(validating);
    initSchemaValidation(validatingSchema);
    digester.setEntityResolver(this);
    digester.setErrorHandler(this);

    if (addCustomDigesterRules(digester)) {
      addDefaultDigesterRules(digester);
    }
  }
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  /**
   * Configures the provided <code>Digester</code> instance appropriate for use with JSF.
   *
   * @param digester - the <code>Digester</code> instance to configure
   */
  private void configureDigester(Digester digester) {

    digester.setNamespaceAware(true);
    digester.setUseContextClassLoader(true);
    digester.setEntityResolver(RESOLVER);
    digester.setErrorHandler(ERROR_HANDLER);
    // disable digester log messages
    digester.setLogger(new NoOpLog());

    if (validating) {

      if (logger.isLoggable(Level.FINE)) {
        logger.log(
            Level.FINE, "Attempting to configure Digester to perform" + " document validation.");
      }

      // In order to validate using *both* DTD and Schema, certain
      // Xerces specific features are required.  Try to set these
      // features.  If an exception is thrown trying to set these
      // features, then disable validation.
      try {
        digester.setFeature(XERCES_VALIDATION, true);
        digester.setFeature(XERCES_SCHEMA_VALIDATION, true);
        digester.setFeature(XERCES_SCHEMA_CONSTRAINT_VALIDATION, true);
        digester.setValidating(true);
      } catch (SAXNotSupportedException e) {

        if (logger.isLoggable(Level.WARNING)) {
          logger.log(
              Level.WARNING,
              "Attempt to set supported feature on XMLReader, "
                  + "but the value provided was not accepted.  "
                  + "Validation will be disabledb.");
        }

        digester.setValidating(false);

      } catch (SAXNotRecognizedException e) {

        if (logger.isLoggable(Level.WARNING)) {
          logger.log(
              Level.WARNING,
              "Attempt to set unsupported feature on XMLReader"
                  + " necessary for validation.  Validation will be"
                  + "disabled.");
        }

        digester.setValidating(false);

      } catch (ParserConfigurationException e) {

        if (logger.isLoggable(Level.WARNING)) {
          logger.log(
              Level.WARNING,
              "Digester unable to configure underlying parser." + "  Validation will be disabled.");
        }

        digester.setValidating(false);
      }
    } else {
      digester.setValidating(false);
    }
  } // END configureDigester