001/* 002 * Copyright 2002-2019 the original author or authors. 003 * 004 * Licensed under the Apache License, Version 2.0 (the "License"); 005 * you may not use this file except in compliance with the License. 006 * You may obtain a copy of the License at 007 * 008 * https://www.apache.org/licenses/LICENSE-2.0 009 * 010 * Unless required by applicable law or agreed to in writing, software 011 * distributed under the License is distributed on an "AS IS" BASIS, 012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 013 * See the License for the specific language governing permissions and 014 * limitations under the License. 015 */ 016 017package org.springframework.core.codec; 018 019import java.util.Map; 020 021import org.reactivestreams.Publisher; 022import reactor.core.publisher.Flux; 023 024import org.springframework.core.ResolvableType; 025import org.springframework.core.io.buffer.DataBuffer; 026import org.springframework.core.io.buffer.DataBufferFactory; 027import org.springframework.lang.Nullable; 028import org.springframework.util.MimeType; 029import org.springframework.util.MimeTypeUtils; 030 031/** 032 * Encoder for {@code byte} arrays. 033 * 034 * @author Arjen Poutsma 035 * @since 5.0 036 */ 037public class ByteArrayEncoder extends AbstractEncoder<byte[]> { 038 039 public ByteArrayEncoder() { 040 super(MimeTypeUtils.ALL); 041 } 042 043 044 @Override 045 public boolean canEncode(ResolvableType elementType, @Nullable MimeType mimeType) { 046 Class<?> clazz = elementType.toClass(); 047 return super.canEncode(elementType, mimeType) && byte[].class.isAssignableFrom(clazz); 048 } 049 050 @Override 051 public Flux<DataBuffer> encode(Publisher<? extends byte[]> inputStream, 052 DataBufferFactory bufferFactory, ResolvableType elementType, @Nullable MimeType mimeType, 053 @Nullable Map<String, Object> hints) { 054 055 // Use (byte[] bytes) for Eclipse 056 return Flux.from(inputStream).map((byte[] bytes) -> 057 encodeValue(bytes, bufferFactory, elementType, mimeType, hints)); 058 } 059 060 @Override 061 public DataBuffer encodeValue(byte[] bytes, DataBufferFactory bufferFactory, 062 ResolvableType valueType, @Nullable MimeType mimeType, @Nullable Map<String, Object> hints) { 063 064 DataBuffer dataBuffer = bufferFactory.wrap(bytes); 065 if (logger.isDebugEnabled() && !Hints.isLoggingSuppressed(hints)) { 066 String logPrefix = Hints.getLogPrefix(hints); 067 logger.debug(logPrefix + "Writing " + dataBuffer.readableByteCount() + " bytes"); 068 } 069 return dataBuffer; 070 } 071 072}