spring ByteBufferEncoder 源码
spring ByteBufferEncoder 代码
文件路径：/spring-core/src/main/java/org/springframework/core/codec/ByteBufferEncoder.java
/*
* Copyright 2002-2019 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.core.codec;
import java.nio.ByteBuffer;
import java.util.Map;
import org.reactivestreams.Publisher;
import reactor.core.publisher.Flux;
import org.springframework.core.ResolvableType;
import org.springframework.core.io.buffer.DataBuffer;
import org.springframework.core.io.buffer.DataBufferFactory;
import org.springframework.lang.Nullable;
import org.springframework.util.MimeType;
import org.springframework.util.MimeTypeUtils;
/**
* Encoder for {@link ByteBuffer ByteBuffers}.
*
* @author Sebastien Deleuze
* @since 5.0
*/
public class ByteBufferEncoder extends AbstractEncoder<ByteBuffer> {
public ByteBufferEncoder() {
super(MimeTypeUtils.ALL);
}
@Override
public boolean canEncode(ResolvableType elementType, @Nullable MimeType mimeType) {
Class<?> clazz = elementType.toClass();
return super.canEncode(elementType, mimeType) && ByteBuffer.class.isAssignableFrom(clazz);
}
@Override
public Flux<DataBuffer> encode(Publisher<? extends ByteBuffer> inputStream,
DataBufferFactory bufferFactory, ResolvableType elementType, @Nullable MimeType mimeType,
@Nullable Map<String, Object> hints) {
return Flux.from(inputStream).map(byteBuffer ->
encodeValue(byteBuffer, bufferFactory, elementType, mimeType, hints));
}
@Override
public DataBuffer encodeValue(ByteBuffer byteBuffer, DataBufferFactory bufferFactory,
ResolvableType valueType, @Nullable MimeType mimeType, @Nullable Map<String, Object> hints) {
DataBuffer dataBuffer = bufferFactory.wrap(byteBuffer);
if (logger.isDebugEnabled() && !Hints.isLoggingSuppressed(hints)) {
String logPrefix = Hints.getLogPrefix(hints);
logger.debug(logPrefix + "Writing " + dataBuffer.readableByteCount() + " bytes");
}
return dataBuffer;
}
}
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