spring HttpMessageEncoder 源码
spring HttpMessageEncoder 代码
文件路径：/spring-web/src/main/java/org/springframework/http/codec/HttpMessageEncoder.java
/*
* Copyright 2002-2018 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* https://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.springframework.http.codec;
import java.util.List;
import java.util.Map;
import org.springframework.core.ResolvableType;
import org.springframework.core.codec.Encoder;
import org.springframework.core.codec.Hints;
import org.springframework.http.MediaType;
import org.springframework.http.server.reactive.ServerHttpRequest;
import org.springframework.http.server.reactive.ServerHttpResponse;
import org.springframework.lang.Nullable;
/**
* Extension of {@code Encoder} exposing extra methods relevant in the context
* of HTTP request or response body encoding.
*
* @author Rossen Stoyanchev
* @since 5.0
* @param <T> the type of elements in the input stream
*/
public interface HttpMessageEncoder<T> extends Encoder<T> {
/**
* Return "streaming" media types for which flushing should be performed
* automatically vs at the end of the input stream.
*/
List<MediaType> getStreamingMediaTypes();
/**
* 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();
}
}
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