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/*
* Copyright 2002-2021 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.Collections;
import java.util.List;
import java.util.Map;
import reactor.core.publisher.Flux;
import reactor.core.publisher.Mono;
import org.springframework.core.MethodParameter;
import org.springframework.core.ResolvableType;
import org.springframework.http.MediaType;
import org.springframework.http.ReactiveHttpInputMessage;
import org.springframework.http.server.reactive.ServerHttpRequest;
import org.springframework.http.server.reactive.ServerHttpResponse;
import org.springframework.lang.Nullable;
/**
* Strategy for reading from a {@link ReactiveHttpInputMessage} and decoding
* the stream of bytes to Objects of type {@code }.
*
* @author Rossen Stoyanchev
* @author Arjen Poutsma
* @author Sebastien Deleuze
* @since 5.0
* @param the type of objects in the decoded output stream
*/
public interface HttpMessageReader {
/**
* Return the list of media types supported by this reader. The list may not
* apply to every possible target element type and calls to this method
* should typically be guarded via {@link #canRead(ResolvableType, MediaType)
* canWrite(elementType, null)}. The list may also exclude media types
* supported only for a specific element type. Alternatively, use
* {@link #getReadableMediaTypes(ResolvableType)} for a more precise list.
* @return the general list of supported media types
*/
List getReadableMediaTypes();
/**
* Return the list of media types supported by this Reader for the given type
* of element. This list may differ from {@link #getReadableMediaTypes()}
* if the Reader doesn't support the element type, or if it supports it
* only for a subset of media types.
* @param elementType the type of element to read
* @return the list of media types supported for the given class
* @since 5.3.4
*/
default List getReadableMediaTypes(ResolvableType elementType) {
return (canRead(elementType, null) ? getReadableMediaTypes() : Collections.emptyList());
}
/**
* Whether the given object type is supported by this reader.
* @param elementType the type of object to check
* @param mediaType the media type for the read (possibly {@code null})
* @return {@code true} if readable, {@code false} otherwise
*/
boolean canRead(ResolvableType elementType, @Nullable MediaType mediaType);
/**
* Read from the input message and decode to a stream of objects.
* @param elementType the type of objects in the stream which must have been
* previously checked via {@link #canRead(ResolvableType, MediaType)}
* @param message the message to read from
* @param hints additional information about how to read and decode the input
* @return the decoded stream of elements
*/
Flux read(ResolvableType elementType, ReactiveHttpInputMessage message, Map hints);
/**
* Read from the input message and decode to a single object.
* @param elementType the type of objects in the stream which must have been
* previously checked via {@link #canRead(ResolvableType, MediaType)}
* @param message the message to read from
* @param hints additional information about how to read and decode the input
* @return the decoded object
*/
Mono readMono(ResolvableType elementType, ReactiveHttpInputMessage message, Map hints);
/**
* Server-side only alternative to
* {@link #read(ResolvableType, ReactiveHttpInputMessage, Map)}
* with additional context available.
* @param actualType the actual type of the target method parameter;
* for annotated controllers, the {@link MethodParameter} can be accessed
* via {@link ResolvableType#getSource()}.
* @param elementType the type of Objects in the output stream
* @param request the current request
* @param response the current response
* @param hints additional information about how to read the body
* @return the decoded stream of elements
*/
default Flux read(ResolvableType actualType, ResolvableType elementType, ServerHttpRequest request,
ServerHttpResponse response, Map hints) {
return read(elementType, request, hints);
}
/**
* Server-side only alternative to
* {@link #readMono(ResolvableType, ReactiveHttpInputMessage, Map)}
* with additional, context available.
* @param actualType the actual type of the target method parameter;
* for annotated controllers, the {@link MethodParameter} can be accessed
* via {@link ResolvableType#getSource()}.
* @param elementType the type of Objects in the output stream
* @param request the current request
* @param response the current response
* @param hints additional information about how to read the body
* @return the decoded stream of elements
*/
default Mono readMono(ResolvableType actualType, ResolvableType elementType, ServerHttpRequest request,
ServerHttpResponse response, Map hints) {
return readMono(elementType, request, hints);
}
}
