Examples with ResolvableTypeProvider org.springframework.core.ResolvableTypeProvider used on opensource projects

Example 1 with ResolvableTypeProvider

use of org.springframework.core.ResolvableTypeProvider in project spring-framework by spring-projects.

the class MultipartHttpMessageWriter method encodePart.

@SuppressWarnings("unchecked")
private <T> Flux<DataBuffer> encodePart(byte[] boundary, String name, T value, DataBufferFactory factory) {
    MultipartHttpOutputMessage message = new MultipartHttpOutputMessage(factory);
    HttpHeaders headers = message.getHeaders();
    T body;
    ResolvableType resolvableType = null;
    if (value instanceof HttpEntity) {
        HttpEntity<T> httpEntity = (HttpEntity<T>) value;
        headers.putAll(httpEntity.getHeaders());
        body = httpEntity.getBody();
        Assert.state(body != null, "MultipartHttpMessageWriter only supports HttpEntity with body");
        if (httpEntity instanceof ResolvableTypeProvider) {
            resolvableType = ((ResolvableTypeProvider) httpEntity).getResolvableType();
        }
    } else {
        body = value;
    }
    if (resolvableType == null) {
        resolvableType = ResolvableType.forClass(body.getClass());
    }
    if (!headers.containsKey(HttpHeaders.CONTENT_DISPOSITION)) {
        if (body instanceof Resource) {
            headers.setContentDispositionFormData(name, ((Resource) body).getFilename());
        } else if (resolvableType.resolve() == Resource.class) {
            body = (T) Mono.from((Publisher<?>) body).doOnNext(o -> headers.setContentDispositionFormData(name, ((Resource) o).getFilename()));
        } else {
            headers.setContentDispositionFormData(name, null);
        }
    }
    MediaType contentType = headers.getContentType();
    final ResolvableType finalBodyType = resolvableType;
    Optional<HttpMessageWriter<?>> writer = this.partWriters.stream().filter(partWriter -> partWriter.canWrite(finalBodyType, contentType)).findFirst();
    if (!writer.isPresent()) {
        return Flux.error(new CodecException("No suitable writer found for part: " + name));
    }
    Publisher<T> bodyPublisher = body instanceof Publisher ? (Publisher<T>) body : Mono.just(body);
    // The writer will call MultipartHttpOutputMessage#write which doesn't actually write
    // but only stores the body Flux and returns Mono.empty().
    Mono<Void> partContentReady = ((HttpMessageWriter<T>) writer.get()).write(bodyPublisher, resolvableType, contentType, message, DEFAULT_HINTS);
    // After partContentReady, we can access the part content from MultipartHttpOutputMessage
    // and use it for writing to the actual request body
    Flux<DataBuffer> partContent = partContentReady.thenMany(Flux.defer(message::getBody));
    return Flux.concat(generateBoundaryLine(boundary, factory), partContent, generateNewLine(factory));
}