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}