public Transporter newTransporter()

in maven-resolver-impl/src/main/java/org/eclipse/aether/internal/impl/DefaultTransporterProvider.java [59:126]
55 lines of code
10 McCabe index (conditional complexity)

    public Transporter newTransporter(RepositorySystemSession session, RemoteRepository repository)
            throws NoTransporterException {
        requireNonNull(session, "session cannot be null");
        requireNonNull(repository, "repository cannot be null");

        PrioritizedComponents<TransporterFactory> factories = PrioritizedComponents.reuseOrCreate(
                session, TransporterFactory.class, transporterFactories, TransporterFactory::getPriority);

        List<NoTransporterException> errors = new ArrayList<>();
        for (PrioritizedComponent<TransporterFactory> factory : factories.getEnabled()) {
            try {
                Transporter transporter = factory.getComponent().newInstance(session, repository);

                if (LOGGER.isDebugEnabled()) {
                    StringBuilder buffer = new StringBuilder(256);
                    buffer.append("Using transporter ")
                            .append(transporter.getClass().getSimpleName());
                    Utils.appendClassLoader(buffer, transporter);
                    buffer.append(" with priority ").append(factory.getPriority());
                    buffer.append(" for ").append(repository.getUrl());

                    Authentication auth = repository.getAuthentication();
                    if (auth != null) {
                        buffer.append(" with ").append(auth);
                    }

                    Proxy proxy = repository.getProxy();
                    if (proxy != null) {
                        buffer.append(" via ")
                                .append(proxy.getHost())
                                .append(':')
                                .append(proxy.getPort());

                        auth = proxy.getAuthentication();
                        if (auth != null) {
                            buffer.append(" with ").append(auth);
                        }
                    }

                    LOGGER.debug(buffer.toString());
                }

                return transporter;
            } catch (NoTransporterException e) {
                // continue and try next factory
                LOGGER.debug("Could not obtain transporter factory for {}", repository, e);
                errors.add(e);
            }
        }

        StringBuilder buffer = new StringBuilder(256);
        if (factories.isEmpty()) {
            buffer.append("No transporter factories registered");
        } else {
            buffer.append("Cannot access ").append(repository.getUrl());
            buffer.append(" using the registered transporter factories: ");
            factories.list(buffer);
        }

        // create exception: if one error, make it cause
        NoTransporterException ex =
                new NoTransporterException(repository, buffer.toString(), errors.size() == 1 ? errors.get(0) : null);
        // if more errors, make them all suppressed
        if (errors.size() > 1) {
            errors.forEach(ex::addSuppressed);
        }
        throw ex;
    }