public XmlConfiguration()

in log4j-core/src/main/java/org/apache/logging/log4j/core/config/xml/XmlConfiguration.java [74:170]
94 lines of code
25 McCabe index (conditional complexity)

    public XmlConfiguration(final LoggerContext loggerContext, final ConfigurationSource configSource) {
        super(loggerContext, configSource);
        byte[] buffer = null;

        try {
            final InputStream configStream = configSource.getInputStream();
            try {
                buffer = toByteArray(configStream);
            } finally {
                Closer.closeSilently(configStream);
            }
            final InputSource source = new InputSource(new ByteArrayInputStream(buffer));
            source.setSystemId(configSource.getLocation());
            final DocumentBuilder documentBuilder = newDocumentBuilder(true);
            Document document;
            try {
                document = documentBuilder.parse(source);
            } catch (final Exception e) {
                // LOG4J2-1127
                final Throwable throwable = Throwables.getRootCause(e);
                if (throwable instanceof UnsupportedOperationException) {
                    LOGGER.warn(
                            "The DocumentBuilder {} does not support an operation: {}."
                                    + "Trying again without XInclude...",
                            documentBuilder,
                            e);
                    document = newDocumentBuilder(false).parse(source);
                } else {
                    throw e;
                }
            }
            rootElement = document.getDocumentElement();
            final Map<String, String> attrs = processAttributes(rootNode, rootElement);
            final StatusConfiguration statusConfig = new StatusConfiguration().withStatus(getDefaultStatus());
            int monitorIntervalSeconds = 0;
            for (final Map.Entry<String, String> entry : attrs.entrySet()) {
                final String key = entry.getKey();
                final String value = getConfigurationStrSubstitutor().replace(entry.getValue());
                if ("status".equalsIgnoreCase(key)) {
                    statusConfig.withStatus(value);
                } else if ("dest".equalsIgnoreCase(key)) {
                    statusConfig.withDestination(value);
                } else if ("shutdownHook".equalsIgnoreCase(key)) {
                    isShutdownHookEnabled = !"disable".equalsIgnoreCase(value);
                } else if ("shutdownTimeout".equalsIgnoreCase(key)) {
                    shutdownTimeoutMillis = Long.parseLong(value);
                } else if ("packages".equalsIgnoreCase(key)) {
                    pluginPackages.addAll(Arrays.asList(value.split(Patterns.COMMA_SEPARATOR)));
                } else if ("name".equalsIgnoreCase(key)) {
                    setName(value);
                } else if ("strict".equalsIgnoreCase(key)) {
                    strict = Boolean.parseBoolean(value);
                } else if ("schema".equalsIgnoreCase(key)) {
                    schemaResource = value;
                } else if ("monitorInterval".equalsIgnoreCase(key)) {
                    monitorIntervalSeconds = Integers.parseInt(value);
                } else if ("advertiser".equalsIgnoreCase(key)) {
                    createAdvertiser(value, configSource, buffer, "text/xml");
                }
            }
            initializeWatchers(this, configSource, monitorIntervalSeconds);
            statusConfig.initialize();
        } catch (final SAXException | IOException | ParserConfigurationException e) {
            LOGGER.error("Error parsing " + configSource.getLocation(), e);
        }
        if (strict && schemaResource != null && buffer != null) {
            try (final InputStream is =
                    Loader.getResourceAsStream(schemaResource, XmlConfiguration.class.getClassLoader())) {
                if (is != null) {
                    final javax.xml.transform.Source src = new StreamSource(is, schemaResource);
                    final SchemaFactory factory = SchemaFactory.newInstance(XMLConstants.W3C_XML_SCHEMA_NS_URI);
                    Schema schema = null;
                    try {
                        schema = factory.newSchema(src);
                    } catch (final SAXException ex) {
                        LOGGER.error("Error parsing Log4j schema", ex);
                    }
                    if (schema != null) {
                        final Validator validator = schema.newValidator();
                        try {
                            validator.validate(new StreamSource(new ByteArrayInputStream(buffer)));
                        } catch (final IOException ioe) {
                            LOGGER.error("Error reading configuration for validation", ioe);
                        } catch (final SAXException ex) {
                            LOGGER.error("Error validating configuration", ex);
                        }
                    }
                }
            } catch (final Exception ex) {
                LOGGER.error("Unable to access schema {}", this.schemaResource, ex);
            }
        }

        if (getName() == null) {
            setName(configSource.getLocation());
        }
    }