HLTech / pact-gen

public class FeignMethodRepresentationExtractor implements ClientMethodRepresentationExtractor {

    private final Collection<AnnotatedMethodHandler> annotatedMethodHandlers;

    public FeignMethodRepresentationExtractor(Collection<AnnotatedMethodHandler> annotatedMethodHandlers) {

        this.annotatedMethodHandlers = annotatedMethodHandlers;

    }

    @Override

    public ClientMethodRepresentation extractClientMethodRepresentation(Method method) {

        return ClientMethodRepresentation.builder()

            .requestRepresentation(extractRequestProperties(method))

            .responseRepresentationList(extractResponseProperties(method))

            .build();

    }

    private RequestRepresentation extractRequestProperties(Method method) {

        return this.annotatedMethodHandlers.stream()

            .filter(annotationHandler -> annotationHandler.isSupported(method))

            .findFirst().orElseThrow(() -> new IllegalArgumentException("Unknown HTTP method"))

            .handleRequest(method);

    }

    private List<ResponseRepresentation> extractResponseProperties(Method method) {

        String[] responseHeaders = this.annotatedMethodHandlers.stream()

            .filter(annotationHandler -> annotationHandler.isSupported(method))

            .findFirst().orElseThrow(() -> new IllegalArgumentException("Unknown HTTP method"))

            .getResponseMediaHeaders(method);

        List<ResponseRepresentation> results = Arrays

            .stream(method.getDeclaredAnnotationsByType(InteractionInfo.class))

            .map(annotation -> ResponseRepresentation.from(

                annotation.responseStatus(),

                RawHeadersParser.parseAll(ArrayUtils.addAll(annotation.responseHeaders(), responseHeaders)),

                method,

                annotation.description(),

                annotation.emptyBodyExpected()))

            .collect(Collectors.toList());

        return !results.isEmpty()

            ? results

            : Lists.newArrayList(ResponseRepresentation.getDefaultForMethod(method, responseHeaders));