return servers.isEmpty() ? null : servers.get(0);
    }

    @Override
    public List<Server> getServers() {
        return servers;
    }

    @Override
    public Proxy getProxy() {
        return proxies.isEmpty() ? null : proxies.get(0);
    }

    @Override
    public List<Proxy> getProxies() {
        return proxies;
    }

    @Override

    /**
     * Gets the decrypted proxy. This is a convenience method to retrieve the first element from {@link #getProxies()}.
     *
     * @return The decrypted proxy or {@code null}.
     */
    Proxy getProxy();

    /**
     * Gets the decrypted proxies.
     *
     * @return The decrypted proxy, can be empty but never {@code null}.
     */
    List<Proxy> getProxies();

    /**

     *
     * @param id an id
     * @return corresponding authentication info
     */
    AuthenticationInfo getAuthenticationInfo(String id);

    ProxyInfo getProxy(String protocol);

    void getArtifact(Artifact artifact, ArtifactRepository repository)
            throws TransferFailedException, ResourceDoesNotExistException;

                    }
                }
            }
        }

        // empty one to prevent NPE
        return new AuthenticationInfo();
    }

    @Override
    public ProxyInfo getProxy(String protocol) {
        MavenSession session = legacySupport.getSession();

        if (session != null && protocol != null) {
            MavenExecutionRequest request = session.getRequest();

    }

    String getRepositoryKey(ArtifactRepository repository) {
        StringBuilder buffer = new StringBuilder(256);

        Proxy proxy = repository.getProxy();
        if (proxy != null) {
            if (proxy.getUserName() != null) {
                int hash = (proxy.getUserName() + proxy.getPassword()).hashCode();
                buffer.append(hash).append('@');