org.springframework.http.codec.json

Class AbstractJackson2Decoder

java.lang.Object

org.springframework.http.codec.json.Jackson2CodecSupport

org.springframework.http.codec.json.AbstractJackson2Decoder

All Implemented Interfaces:

org.springframework.core.codec.Decoder<Object>, HttpMessageDecoder<Object>

Direct Known Subclasses:

Jackson2JsonDecoder, Jackson2SmileDecoder

public abstract class AbstractJackson2Decoder
extends Jackson2CodecSupport
implements HttpMessageDecoder<Object>

Abstract base class for Jackson 2.9 decoding, leveraging non-blocking parsing.

Since:

5.0

Author:

Sebastien Deleuze, Rossen Stoyanchev, Arjen Poutsma

See Also:

Add support for non-blocking ("async") JSON parsing

Field Summary

Fields inherited from class org.springframework.http.codec.json.Jackson2CodecSupport

JSON_VIEW_HINT, logger

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	AbstractJackson2Decoder(ObjectMapper mapper, org.springframework.util.MimeType... mimeTypes) Constructor with a Jackson ObjectMapper to use.

Method Summary

Modifier and Type	Method and Description
boolean	canDecode(org.springframework.core.ResolvableType elementType, org.springframework.util.MimeType mimeType)
reactor.core.publisher.Flux<Object>	decode(org.reactivestreams.Publisher<org.springframework.core.io.buffer.DataBuffer> input, org.springframework.core.ResolvableType elementType, org.springframework.util.MimeType mimeType, Map<String,Object> hints)
reactor.core.publisher.Mono<Object>	decodeToMono(org.reactivestreams.Publisher<org.springframework.core.io.buffer.DataBuffer> input, org.springframework.core.ResolvableType elementType, org.springframework.util.MimeType mimeType, Map<String,Object> hints)
protected <A extends Annotation> A	getAnnotation(org.springframework.core.MethodParameter parameter, Class<A> annotType)
List<org.springframework.util.MimeType>	getDecodableMimeTypes()
Map<String,Object>	getDecodeHints(org.springframework.core.ResolvableType actualType, org.springframework.core.ResolvableType elementType, ServerHttpRequest request, ServerHttpResponse response) Get decoding hints based on the server request or annotations on the target controller method parameter.
int	getMaxInMemorySize() Return the configured byte count limit.
void	setMaxInMemorySize(int byteCount) Set the max number of bytes that can be buffered by this decoder.

Methods inherited from class org.springframework.http.codec.json.Jackson2CodecSupport

getHints, getJavaType, getMimeTypes, getObjectMapper, getParameter, supportsMimeType

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

AbstractJackson2Decoder

protected AbstractJackson2Decoder(ObjectMapper mapper,
                                  org.springframework.util.MimeType... mimeTypes)

Constructor with a Jackson ObjectMapper to use.

Method Detail

setMaxInMemorySize

public void setMaxInMemorySize(int byteCount)

Set the max number of bytes that can be buffered by this decoder. This is either the size of the entire input when decoding as a whole, or the size of one top-level JSON object within a JSON stream. When the limit is exceeded, DataBufferLimitException is raised.

By default in 5.1 this is set to -1, unlimited. In 5.2 the default value for this limit is set to 256K.

Parameters:

byteCount - the max number of bytes to buffer, or -1 for unlimited

Since:

5.1.11

getMaxInMemorySize

public int getMaxInMemorySize()

Return the configured byte count limit.

Since:

5.1.11

canDecode

public boolean canDecode(org.springframework.core.ResolvableType elementType,
                         @Nullable
                         org.springframework.util.MimeType mimeType)

Specified by:

canDecode in interface org.springframework.core.codec.Decoder<Object>

decode

public reactor.core.publisher.Flux<Object> decode(org.reactivestreams.Publisher<org.springframework.core.io.buffer.DataBuffer> input,
                                                  org.springframework.core.ResolvableType elementType,
                                                  @Nullable
                                                  org.springframework.util.MimeType mimeType,
                                                  @Nullable
                                                  Map<String,Object> hints)

Specified by:

decode in interface org.springframework.core.codec.Decoder<Object>

decodeToMono

public reactor.core.publisher.Mono<Object> decodeToMono(org.reactivestreams.Publisher<org.springframework.core.io.buffer.DataBuffer> input,
                                                        org.springframework.core.ResolvableType elementType,
                                                        @Nullable
                                                        org.springframework.util.MimeType mimeType,
                                                        @Nullable
                                                        Map<String,Object> hints)

Specified by:

decodeToMono in interface org.springframework.core.codec.Decoder<Object>

getDecodeHints

public Map<String,Object> getDecodeHints(org.springframework.core.ResolvableType actualType,
                                         org.springframework.core.ResolvableType elementType,
                                         ServerHttpRequest request,
                                         ServerHttpResponse response)

Description copied from interface: HttpMessageDecoder

Get decoding hints based on the server request or annotations on the target controller method parameter.

Specified by:

getDecodeHints in interface HttpMessageDecoder<Object>

Parameters:

actualType - the actual target type to decode to, possibly a reactive wrapper and sourced from MethodParameter, i.e. providing access to method parameter annotations

elementType - the element type within Flux/Mono that we're trying to decode to

request - the current request

response - the current response

Returns:

a Map with hints, possibly empty

getDecodableMimeTypes

public List<org.springframework.util.MimeType> getDecodableMimeTypes()

Specified by:

getDecodableMimeTypes in interface org.springframework.core.codec.Decoder<Object>

getAnnotation

protected <A extends Annotation> A getAnnotation(org.springframework.core.MethodParameter parameter,
                                                 Class<A> annotType)

Specified by:

getAnnotation in class Jackson2CodecSupport