spring Jackson2SmileEncoder 源码
spring Jackson2SmileEncoder 代码
文件路径：/spring-web/src/main/java/org/springframework/http/codec/json/Jackson2SmileEncoder.java
/*
* 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.json;
import java.util.Collections;
import java.util.List;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.dataformat.smile.SmileFactory;
import reactor.core.publisher.Flux;
import org.springframework.http.MediaType;
import org.springframework.http.converter.json.Jackson2ObjectMapperBuilder;
import org.springframework.lang.Nullable;
import org.springframework.util.Assert;
import org.springframework.util.MimeType;
/**
* Encode from an {@code Object} stream to a byte stream of Smile objects using Jackson 2.9.
* For non-streaming use cases, {@link Flux} elements are collected into a {@link List}
* before serialization for performance reason.
*
* @author Sebastien Deleuze
* @since 5.0
* @see Jackson2SmileDecoder
*/
public class Jackson2SmileEncoder extends AbstractJackson2Encoder {
private static final MimeType[] DEFAULT_SMILE_MIME_TYPES = new MimeType[] {
new MimeType("application", "x-jackson-smile"),
new MimeType("application", "*+x-jackson-smile")};
private static final byte[] STREAM_SEPARATOR = new byte[0];
public Jackson2SmileEncoder() {
this(Jackson2ObjectMapperBuilder.smile().build(), DEFAULT_SMILE_MIME_TYPES);
}
public Jackson2SmileEncoder(ObjectMapper mapper, MimeType... mimeTypes) {
super(mapper, mimeTypes);
Assert.isAssignable(SmileFactory.class, mapper.getFactory().getClass());
setStreamingMediaTypes(Collections.singletonList(new MediaType("application", "stream+x-jackson-smile")));
}
/**
* Return the separator to use for the given mime type.
* <p>By default, this method returns a single byte 0 if the given
* mime type is one of the configured {@link #setStreamingMediaTypes(List)
* streaming} mime types.
* @since 5.3
*/
@Nullable
@Override
protected byte[] getStreamingMediaTypeSeparator(@Nullable MimeType mimeType) {
for (MediaType streamingMediaType : getStreamingMediaTypes()) {
if (streamingMediaType.isCompatibleWith(mimeType)) {
return STREAM_SEPARATOR;
}
}
return null;
}
}
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