Example usage for org.springframework.http.converter HttpMessageConverter canRead

Introduction

In this page you can find the example usage for org.springframework.http.converter HttpMessageConverter canRead.

Prototype

boolean canRead(Class<?> clazz, @Nullable MediaType mediaType);

Source Link

Document

Indicates whether the given class can be read by this converter.

Usage

From source file:org.springframework.web.servlet.mvc.method.annotation.support.AbstractMessageConverterMethodProcessor.java

@SuppressWarnings("unchecked")
protected <T> Object readWithMessageConverters(NativeWebRequest webRequest, MethodParameter methodParam,
        Class<T> paramType) throws IOException, HttpMediaTypeNotSupportedException {

    HttpInputMessage inputMessage = createInputMessage(webRequest);

    MediaType contentType = inputMessage.getHeaders().getContentType();
    if (contentType == null) {
        StringBuilder builder = new StringBuilder(ClassUtils.getShortName(methodParam.getParameterType()));
        String paramName = methodParam.getParameterName();
        if (paramName != null) {
            builder.append(' ');
            builder.append(paramName);//from w w  w. j  ava  2 s.  c  om
        }
        throw new HttpMediaTypeNotSupportedException("Cannot read parameter (" + builder.toString()
                + ") using HttpMessageConverters: no Content-Type found in HTTP request");
    }

    List<MediaType> allSupportedMediaTypes = new ArrayList<MediaType>();
    if (this.messageConverters != null) {
        for (HttpMessageConverter<?> messageConverter : this.messageConverters) {
            allSupportedMediaTypes.addAll(messageConverter.getSupportedMediaTypes());
            if (messageConverter.canRead(paramType, contentType)) {
                if (logger.isDebugEnabled()) {
                    logger.debug("Reading [" + paramType.getName() + "] as \"" + contentType + "\" using ["
                            + messageConverter + "]");
                }
                return ((HttpMessageConverter<T>) messageConverter).read(paramType, inputMessage);
            }
        }
    }

    throw new HttpMediaTypeNotSupportedException(contentType, allSupportedMediaTypes);
}

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