org.springframework.core.codec.NettyByteBufEncoder Maven / Gradle / Ivy
/*
* Copyright 2002-2020 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.util.Map;
import io.netty.buffer.ByteBuf;
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.core.io.buffer.NettyDataBufferFactory;
import org.springframework.lang.Nullable;
import org.springframework.util.MimeType;
import org.springframework.util.MimeTypeUtils;
/**
* Encoder for {@link ByteBuf ByteBufs}.
*
* @author Vladislav Kisel
* @since 5.3
*/
public class NettyByteBufEncoder extends AbstractEncoder {
public NettyByteBufEncoder() {
super(MimeTypeUtils.ALL);
}
@Override
public boolean canEncode(ResolvableType type, @Nullable MimeType mimeType) {
Class clazz = type.toClass();
return super.canEncode(type, mimeType) && ByteBuf.class.isAssignableFrom(clazz);
}
@Override
public Flux encode(Publisher inputStream,
DataBufferFactory bufferFactory, ResolvableType elementType, @Nullable MimeType mimeType,
@Nullable Map hints) {
return Flux.from(inputStream).map(byteBuffer ->
encodeValue(byteBuffer, bufferFactory, elementType, mimeType, hints));
}
@Override
public DataBuffer encodeValue(ByteBuf byteBuf, DataBufferFactory bufferFactory,
ResolvableType valueType, @Nullable MimeType mimeType, @Nullable Map hints) {
if (logger.isDebugEnabled() && !Hints.isLoggingSuppressed(hints)) {
String logPrefix = Hints.getLogPrefix(hints);
logger.debug(logPrefix + "Writing " + byteBuf.readableBytes() + " bytes");
}
if (bufferFactory instanceof NettyDataBufferFactory) {
return ((NettyDataBufferFactory) bufferFactory).wrap(byteBuf);
}
byte[] bytes = new byte[byteBuf.readableBytes()];
byteBuf.readBytes(bytes);
byteBuf.release();
return bufferFactory.wrap(bytes);
}
}