spring ByteBufferDecoder 源码
spring ByteBufferDecoder 代码
文件路径：/spring-core/src/main/java/org/springframework/core/codec/ByteBufferDecoder.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.springframework.core.ResolvableType;
import org.springframework.core.io.buffer.DataBuffer;
import org.springframework.core.io.buffer.DataBufferUtils;
import org.springframework.lang.Nullable;
import org.springframework.util.MimeType;
import org.springframework.util.MimeTypeUtils;
/**
* Decoder for {@link ByteBuffer ByteBuffers}.
*
* @author Sebastien Deleuze
* @author Arjen Poutsma
* @author Rossen Stoyanchev
* @since 5.0
*/
public class ByteBufferDecoder extends AbstractDataBufferDecoder<ByteBuffer> {
public ByteBufferDecoder() {
super(MimeTypeUtils.ALL);
}
@Override
public boolean canDecode(ResolvableType elementType, @Nullable MimeType mimeType) {
return (ByteBuffer.class.isAssignableFrom(elementType.toClass()) &&
super.canDecode(elementType, mimeType));
}
@Override
public ByteBuffer decode(DataBuffer dataBuffer, ResolvableType elementType,
@Nullable MimeType mimeType, @Nullable Map<String, Object> hints) {
int byteCount = dataBuffer.readableByteCount();
ByteBuffer copy = ByteBuffer.allocate(byteCount);
copy.put(dataBuffer.asByteBuffer());
copy.flip();
DataBufferUtils.release(dataBuffer);
if (logger.isDebugEnabled()) {
logger.debug(Hints.getLogPrefix(hints) + "Read " + byteCount + " bytes");
}
return copy;
}
}
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