public static CouchDbProvider createNoSqlProvider()

in log4j-couchdb/src/main/java/org/apache/logging/log4j/couchdb/CouchDbProvider.java [86:160]
70 lines of code
17 McCabe index (conditional complexity)

    public static CouchDbProvider createNoSqlProvider(
            @PluginAttribute("databaseName") final String databaseName,
            @PluginAttribute("protocol") String protocol,
            @PluginAttribute(value = "server", defaultString = "localhost") @ValidHost final String server,
            @PluginAttribute(value = "port", defaultString = "0") @ValidPort final String port,
            @PluginAttribute("username") final String username,
            @PluginAttribute(value = "password", sensitive = true) final String password,
            @PluginAttribute("factoryClassName") final String factoryClassName,
            @PluginAttribute("factoryMethodName") final String factoryMethodName) {
        CouchDbClient client;
        String description;
        if (Strings.isNotEmpty(factoryClassName) && Strings.isNotEmpty(factoryMethodName)) {
            try {
                final Class<?> factoryClass = LoaderUtil.loadClass(factoryClassName);
                final Method method = factoryClass.getMethod(factoryMethodName);
                final Object object = method.invoke(null);

                if (object instanceof CouchDbClient) {
                    client = (CouchDbClient) object;
                    description = "uri=" + client.getDBUri();
                } else if (object instanceof CouchDbProperties) {
                    final CouchDbProperties properties = (CouchDbProperties) object;
                    client = new CouchDbClient(properties);
                    description = "uri=" + client.getDBUri() + ", username=" + properties.getUsername()
                            + ", maxConnections=" + properties.getMaxConnections() + ", connectionTimeout="
                            + properties.getConnectionTimeout() + ", socketTimeout=" + properties.getSocketTimeout();
                } else {
                    if (object == null) {
                        LOGGER.error("The factory method [{}.{}()] returned null.", factoryClassName, factoryMethodName);
                    } else {
                        LOGGER.error("The factory method [{}.{}()] returned an unsupported type [{}].", factoryClassName,
                                factoryMethodName, object.getClass().getName());
                    }
                    return null;
                }
            } catch (final ClassNotFoundException e) {
                LOGGER.error("The factory class [{}] could not be loaded.", factoryClassName, e);
                return null;
            } catch (final NoSuchMethodException e) {
                LOGGER.error("The factory class [{}] does not have a no-arg method named [{}].", factoryClassName,
                        factoryMethodName, e);
                return null;
            } catch (final Exception e) {
                LOGGER.error("The factory method [{}.{}()] could not be invoked.", factoryClassName, factoryMethodName,
                        e);
                return null;
            }
        } else if (Strings.isNotEmpty(databaseName)) {
            if (protocol != null && protocol.length() > 0) {
                protocol = toRootLowerCase(protocol);
                if (!protocol.equals("http") && !protocol.equals("https")) {
                    LOGGER.error("Only protocols [http] and [https] are supported, [{}] specified.", protocol);
                    return null;
                }
            } else {
                protocol = "http";
                LOGGER.warn("No protocol specified, using default port [http].");
            }

            final int portInt = TypeConverters.convert(port, int.class, protocol.equals("https") ? HTTPS : HTTP);

            if (Strings.isEmpty(username) || Strings.isEmpty(password)) {
                LOGGER.error("You must provide a username and password for the CouchDB provider.");
                return null;
            }

            client = new CouchDbClient(databaseName, false, protocol, server, portInt, username, password);
            description = "uri=" + client.getDBUri() + ", username=" + username;
        } else {
            LOGGER.error("No factory method was provided so the database name is required.");
            return null;
        }

        return new CouchDbProvider(client, description);
    }