public GremlinCluster create()

in neptune-gremlin-client/gremlin-client/src/main/java/software/amazon/neptune/cluster/NeptuneGremlinClusterBuilder.java [310:360]
42 lines of code
12 McCabe index (conditional complexity)

    public GremlinCluster create() {

        if (addresses.isEmpty()) {
            if (isDirectConnection()) {
                throw new IllegalArgumentException("You must supply one or more Neptune endpoints");
            } else if (enableIamAuth) {
                throw new IllegalArgumentException("You must supply one or more Neptune endpoints to sign the Host header");
            }
        }

        if (isDirectConnection()) {
            innerBuilder.port(port);
            for (String address : addresses) {
                innerBuilder.addContactPoint(address);
            }
        } else {
            innerBuilder.port(loadBalancerPort);
            if (networkLoadBalancerEndpoint != null) {
                innerBuilder.addContactPoint(networkLoadBalancerEndpoint);
            } else if (applicationLoadBalancerEndpoint != null) {
                innerBuilder.addContactPoint(applicationLoadBalancerEndpoint);
            }
        }

        if (interceptor != null) {
            innerBuilder.handshakeInterceptor(interceptor);
        } else if (enableIamAuth) {

            IamAuthConfig.IamAuthConfigBuilder iamAuthConfigBuilder =
                    IamAuthConfig.builder()
                            .addNeptuneEndpoints(addresses)
                            .setNeptunePort(port)
                            .setServiceRegion(serviceRegion)
                            .setIamProfile(iamProfile)
                            .setCredentials(credentials);

            if (!isDirectConnection()) {
                iamAuthConfigBuilder.connectViaLoadBalancer();
            }

            if (applicationLoadBalancerEndpoint != null) {
                iamAuthConfigBuilder.removeHostHeaderAfterSigning();
            }

            IamAuthConfig iamAuthConfig = iamAuthConfigBuilder.build();

            innerBuilder.handshakeInterceptor(new LBAwareHandshakeInterceptor(iamAuthConfig));
        }

        return innerBuilder.create();
    }