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.springframework.core.ResolvableType; 022import org.springframework.core.io.buffer.DataBuffer; 023import org.springframework.core.io.buffer.DataBufferUtils; 024import org.springframework.lang.Nullable; 025import org.springframework.util.MimeType; 026import org.springframework.util.MimeTypeUtils; 027 028/** 029 * Decoder for {@code byte} arrays. 030 * 031 * @author Arjen Poutsma 032 * @author Rossen Stoyanchev 033 * @since 5.0 034 */ 035public class ByteArrayDecoder extends AbstractDataBufferDecoder<byte[]> { 036 037 public ByteArrayDecoder() { 038 super(MimeTypeUtils.ALL); 039 } 040 041 042 @Override 043 public boolean canDecode(ResolvableType elementType, @Nullable MimeType mimeType) { 044 return (elementType.resolve() == byte[].class && super.canDecode(elementType, mimeType)); 045 } 046 047 @Override 048 public byte[] decode(DataBuffer dataBuffer, ResolvableType elementType, 049 @Nullable MimeType mimeType, @Nullable Map<String, Object> hints) { 050 051 byte[] result = new byte[dataBuffer.readableByteCount()]; 052 dataBuffer.read(result); 053 DataBufferUtils.release(dataBuffer); 054 if (logger.isDebugEnabled()) { 055 logger.debug(Hints.getLogPrefix(hints) + "Read " + result.length + " bytes"); 056 } 057 return result; 058 } 059 060}