org.springframework.core.codec.Hints# none ( ) 源码实例Demo

protected Map<String, Object> getHints(ResolvableType resolvableType) {
	MethodParameter param = getParameter(resolvableType);
	if (param != null) {
		JsonView annotation = getAnnotation(param, JsonView.class);
		if (annotation != null) {
			Class<?>[] classes = annotation.value();
			Assert.isTrue(classes.length == 1, JSON_VIEW_HINT_ERROR + param);
			return Hints.from(JSON_VIEW_HINT, classes[0]);
		}
	}
	return Hints.none();
}
 

@Override
protected Map<String, Object> getReadHints(ResolvableType actualType, ResolvableType elementType,
		ServerHttpRequest request, ServerHttpResponse response) {

	String name = request.getHeaders().getContentDisposition().getFilename();
	return StringUtils.hasText(name) ? Hints.from(ResourceDecoder.FILENAME_HINT, name) : Hints.none();
}
 

protected Map<String, Object> getHints(ResolvableType resolvableType) {
	MethodParameter param = getParameter(resolvableType);
	if (param != null) {
		JsonView annotation = getAnnotation(param, JsonView.class);
		if (annotation != null) {
			Class<?>[] classes = annotation.value();
			Assert.isTrue(classes.length == 1, JSON_VIEW_HINT_ERROR + param);
			return Hints.from(JSON_VIEW_HINT, classes[0]);
		}
	}
	return Hints.none();
}
 

@Override
public Map<String, Object> getEncodeHints(@Nullable ResolvableType actualType, ResolvableType elementType,
		@Nullable MediaType mediaType, ServerHttpRequest request, ServerHttpResponse response) {

	return (actualType != null ? getHints(actualType) : Hints.none());
}
 

@Override
public Map<String, Object> getEncodeHints(@Nullable ResolvableType actualType, ResolvableType elementType,
		@Nullable MediaType mediaType, ServerHttpRequest request, ServerHttpResponse response) {

	return (actualType != null ? getHints(actualType) : Hints.none());
}
 

/**
 * Get decoding hints based on the server request or annotations on the
 * target controller method parameter.
 * @param actualType the actual source type to encode, possibly a reactive
 * wrapper and sourced from {@link org.springframework.core.MethodParameter},
 * i.e. providing access to method annotations.
 * @param elementType the element type within {@code Flux/Mono} that we're
 * trying to encode.
 * @param request the current request
 * @param response the current response
 * @return a Map with hints, possibly empty
 */
default Map<String, Object> getEncodeHints(ResolvableType actualType, ResolvableType elementType,
		@Nullable MediaType mediaType, ServerHttpRequest request, ServerHttpResponse response) {

	return Hints.none();
}
 

/**
 * Get decoding hints based on the server request or annotations on the
 * target controller method parameter.
 * @param actualType the actual source type to encode, possibly a reactive
 * wrapper and sourced from {@link org.springframework.core.MethodParameter},
 * i.e. providing access to method annotations.
 * @param elementType the element type within {@code Flux/Mono} that we're
 * trying to encode.
 * @param request the current request
 * @param response the current response
 * @return a Map with hints, possibly empty
 */
default Map<String, Object> getEncodeHints(ResolvableType actualType, ResolvableType elementType,
		@Nullable MediaType mediaType, ServerHttpRequest request, ServerHttpResponse response) {

	return Hints.none();
}