}

    if (generate) {
      File outputDir = getOutputDirectory();
      if (getLog().isDebugEnabled()) {
        getLog().debug(String.format("Using outputDirectory: %s", outputDir.getPath()));
      }

      if (!outputDir.exists() && !outputDir.mkdirs()) {
        throw new MojoExecutionException("Unable to create output directory: " + outputDir);
      }

      BindingModuleLoader loader = newModuleLoader();

      // generate Java sources based on provided metaschema sources
      final Set<IModule> modules = new HashSet<>();
      for (File source : getModuleSources().collect(Collectors.toList())) {
        assert source != null;
        if (getLog().isInfoEnabled()) {
          getLog().info("Using metaschema source: " + source.getPath());
        }
        IBindingMetaschemaModule module;
        try {
          module = loader.load(source);
        } catch (MetaschemaException | IOException ex) {
          throw new MojoExecutionException("Loading of metaschema failed", ex);
        }

        // IValidationResult result = IBindingContext.instance().validate(
        // module.getSourceNodeItem(),
        // IBindingContext.instance().newBoundLoader(),
        // null);
        //
        // LoggingValidationHandler.instance().handleValidationResults(validationResult);

        modules.add(module);
      }

      generate(modules);

      // create the stale file
      if (!staleFileDirectory.exists() && !staleFileDirectory.mkdirs()) {
        throw new MojoExecutionException("Unable to create output directory: " + staleFileDirectory);
      }
      try (OutputStream os
          = Files.newOutputStream(staleFile.toPath(), StandardOpenOption.CREATE, StandardOpenOption.WRITE,
              StandardOpenOption.TRUNCATE_EXISTING)) {
        os.close();
        if (getLog().isInfoEnabled()) {
          getLog().info("Created stale file: " + staleFile);
        }
      } catch (IOException ex) {
        throw new MojoExecutionException("Failed to write stale file: " + staleFile.getPath(), ex);
      }

      // for m2e
      getBuildContext().refresh(getOutputDirectory());
    }