private void parseValidators()

in core/src/main/java/org/apache/struts2/validator/DefaultValidatorFactory.java [116:194]
59 lines of code
15 McCabe index (conditional complexity)

    private void parseValidators() {
        LOG.debug("Loading validator definitions.");

        List<File> files = new ArrayList<>();
        try {
            // Get custom validator configurations via the classpath
            Iterator<URL> urls = ClassLoaderUtil.getResources("", DefaultValidatorFactory.class, false);
            while (urls.hasNext()) {
                URL u = urls.next();
                try {
                    URI uri = new URI(u.toExternalForm().replaceAll(" ", "%20"));
                    if (!uri.isOpaque() && "file".equalsIgnoreCase(uri.getScheme())) {
                        File f = new File(uri);
                        FilenameFilter filter = (file, fileName) -> fileName.contains("-validators.xml");
                        // First check if this is a directory
                        // If yes, then just do a "list" to get all files in this directory
                        // and match the filenames with *-validators.xml. If the filename
                        // matches then add to the list of files to be parsed
                        if (f.isDirectory()) {
                            try {
                                File[] ff = f.listFiles(filter);
                                if ( ff != null && ff.length > 0) {
                                    files.addAll(Arrays.asList(ff));
                                }
                            } catch (SecurityException se) {
                                LOG.error("Security Exception while accessing directory '{}'", f, se);
                            }

                        } else {
                            // If this is not a directory, then get hold of the inputstream.
                            // If its not a ZipInputStream, then create a ZipInputStream out
                            // of it. The intention is to allow nested jar files to be scanned
                            // for *-validators.xml.
                            // Ex: struts-app.jar -> MyApp.jar -> Login-validators.xml should be
                            // parsed and loaded.
                            ZipInputStream zipInputStream = null;
                            try (InputStream inputStream = u.openStream()) {
                                if (inputStream instanceof ZipInputStream) {
                                    zipInputStream = (ZipInputStream) inputStream;
                                } else {
                                    zipInputStream = new ZipInputStream(inputStream);
                                }
                                ZipEntry zipEntry = zipInputStream.getNextEntry();
                                while (zipEntry != null) {
                                    if (zipEntry.getName().endsWith("-validators.xml")) {
                                        LOG.trace("Adding validator {}", zipEntry.getName());
                                        files.add(new File(zipEntry.getName()));
                                    }
                                    zipEntry = zipInputStream.getNextEntry();
                                }
                            } finally {
                                //cleanup
                                if (zipInputStream != null) {
                                    zipInputStream.close();
                                }
                            }
                        }
                    }
                } catch (Exception ex) {
                    LOG.error("Unable to load {}", u, ex);
                }
            }
        } catch (IOException e) {
            throw new ConfigurationException("Unable to parse validators", e);
        }

        // Parse default validator configurations
        String resourceName = "org/apache/struts2/validator/validators/default.xml";
        retrieveValidatorConfiguration(resourceName);

        // Overwrite and extend defaults with application specific validator configurations
        resourceName = "validators.xml";
        retrieveValidatorConfiguration(resourceName);

        // Add custom (plugin) specific validator configurations
        for (File file : files) {
            retrieveValidatorConfiguration(file.getName());
        }
    }