Example usage for org.springframework.http.codec HttpMessageReader canRead

Introduction

In this page you can find the example usage for org.springframework.http.codec HttpMessageReader canRead.

Prototype

boolean canRead(ResolvableType elementType, @Nullable MediaType mediaType);

Source Link

Document

Whether the given object type is supported by this reader.

Usage

From source file:org.springframework.cloud.function.web.RequestProcessor.java

private Publisher<?> body(Object handler, ServerWebExchange exchange) {
    ResolvableType elementType = ResolvableType.forClass(this.inspector.getInputType(handler));
    ResolvableType actualType = elementType;
    Class<?> resolvedType = elementType.resolve();
    ReactiveAdapter adapter = (resolvedType != null ? getAdapterRegistry().getAdapter(resolvedType) : null);

    ServerHttpRequest request = exchange.getRequest();
    ServerHttpResponse response = exchange.getResponse();

    MediaType contentType = request.getHeaders().getContentType();
    MediaType mediaType = (contentType != null ? contentType : MediaType.APPLICATION_OCTET_STREAM);

    if (logger.isDebugEnabled()) {
        logger.debug(exchange.getLogPrefix() + (contentType != null ? "Content-Type:" + contentType
                : "No Content-Type, using " + MediaType.APPLICATION_OCTET_STREAM));
    }/* w  w w.jav a 2  s  . co  m*/
    boolean isBodyRequired = (adapter != null && !adapter.supportsEmpty());

    MethodParameter bodyParam = new MethodParameter(handlerMethod(handler), 0);
    for (HttpMessageReader<?> reader : getMessageReaders()) {
        if (reader.canRead(elementType, mediaType)) {
            Map<String, Object> readHints = Hints.from(Hints.LOG_PREFIX_HINT, exchange.getLogPrefix());
            if (adapter != null && adapter.isMultiValue()) {
                if (logger.isDebugEnabled()) {
                    logger.debug(exchange.getLogPrefix() + "0..N [" + elementType + "]");
                }
                Flux<?> flux = reader.read(actualType, elementType, request, response, readHints);
                flux = flux.onErrorResume(ex -> Flux.error(handleReadError(bodyParam, ex)));
                if (isBodyRequired) {
                    flux = flux.switchIfEmpty(Flux.error(() -> handleMissingBody(bodyParam)));
                }
                return Mono.just(adapter.fromPublisher(flux));
            } else {
                // Single-value (with or without reactive type wrapper)
                if (logger.isDebugEnabled()) {
                    logger.debug(exchange.getLogPrefix() + "0..1 [" + elementType + "]");
                }
                Mono<?> mono = reader.readMono(actualType, elementType, request, response, readHints);
                mono = mono.onErrorResume(ex -> Mono.error(handleReadError(bodyParam, ex)));
                if (isBodyRequired) {
                    mono = mono.switchIfEmpty(Mono.error(() -> handleMissingBody(bodyParam)));
                }
                return (adapter != null ? Mono.just(adapter.fromPublisher(mono)) : Mono.from(mono));
            }
        }
    }

    return Mono.error(new UnsupportedMediaTypeStatusException(mediaType,
            Arrays.asList(MediaType.APPLICATION_JSON), elementType));
}

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