private Object getValueImpl()

in common/common-rest/src/main/java/org/apache/servicecomb/common/rest/codec/param/BodyProcessorCreator.java [105:148]
35 lines of code
14 McCabe index (conditional complexity)

    private Object getValueImpl(HttpServletRequest request) throws IOException {
      Object body = request.getAttribute(RestConst.BODY_PARAMETER);
      if (body != null) {
        return convertValue(body, targetType);
      }

      // edge support convert from form-data or x-www-form-urlencoded to json automatically
      String contentType = request.getContentType();
      contentType = contentType == null ? "" : contentType.toLowerCase(Locale.US);
      if (contentType.startsWith(MediaType.MULTIPART_FORM_DATA)
          || contentType.startsWith(MediaType.APPLICATION_FORM_URLENCODED)) {
        return convertValue(request.getParameterMap(), targetType);
      }

      // for standard HttpServletRequest, getInputStream will never return null
      // but for mocked HttpServletRequest, maybe get a null
      //  like org.apache.servicecomb.provider.springmvc.reference.ClientToHttpServletRequest
      InputStream inputStream = request.getInputStream();
      if (inputStream == null) {
        return null;
      }

      if (!contentType.isEmpty() && !contentType.startsWith(MediaType.APPLICATION_JSON)) {
        // TODO: we should consider body encoding
        return IOUtils.toString(inputStream, StandardCharsets.UTF_8);
      }
      try {
        ObjectReader reader = serialViewClass != null
            ? RestObjectMapperFactory.getRestObjectMapper().readerWithView(serialViewClass)
            : RestObjectMapperFactory.getRestObjectMapper().reader();
        if (decodeAsObject) {
          return reader.forType(OBJECT_TYPE).readValue(inputStream);
        }
        return reader.forType(targetType == null ? OBJECT_TYPE : targetType)
            .readValue(inputStream);
      } catch (MismatchedInputException e) {
        // there is no way to detect InputStream is empty, so have to catch the exception
        if (!isRequired && e.getMessage().contains("No content to map due to end-of-input")) {
          LOGGER.info("Empty content and required is false, taken as null");
          return null;
        }
        throw e;
      }
    }