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.Arrays; 020import java.util.List; 021import java.util.Map; 022 023import org.apache.commons.logging.Log; 024import org.apache.commons.logging.LogFactory; 025import org.reactivestreams.Publisher; 026import reactor.core.publisher.Mono; 027 028import org.springframework.core.ResolvableType; 029import org.springframework.core.io.buffer.DataBuffer; 030import org.springframework.lang.Nullable; 031import org.springframework.util.MimeType; 032 033/** 034 * Abstract base class for {@link Decoder} implementations. 035 * 036 * @author Sebastien Deleuze 037 * @author Arjen Poutsma 038 * @since 5.0 039 * @param <T> the element type 040 */ 041public abstract class AbstractDecoder<T> implements Decoder<T> { 042 043 private final List<MimeType> decodableMimeTypes; 044 045 protected Log logger = LogFactory.getLog(getClass()); 046 047 048 protected AbstractDecoder(MimeType... supportedMimeTypes) { 049 this.decodableMimeTypes = Arrays.asList(supportedMimeTypes); 050 } 051 052 053 /** 054 * Set an alternative logger to use than the one based on the class name. 055 * @param logger the logger to use 056 * @since 5.1 057 */ 058 public void setLogger(Log logger) { 059 this.logger = logger; 060 } 061 062 /** 063 * Return the currently configured Logger. 064 * @since 5.1 065 */ 066 public Log getLogger() { 067 return logger; 068 } 069 070 071 @Override 072 public List<MimeType> getDecodableMimeTypes() { 073 return this.decodableMimeTypes; 074 } 075 076 @Override 077 public boolean canDecode(ResolvableType elementType, @Nullable MimeType mimeType) { 078 if (mimeType == null) { 079 return true; 080 } 081 for (MimeType candidate : this.decodableMimeTypes) { 082 if (candidate.isCompatibleWith(mimeType)) { 083 return true; 084 } 085 } 086 return false; 087 } 088 089 @Override 090 public Mono<T> decodeToMono(Publisher<DataBuffer> inputStream, ResolvableType elementType, 091 @Nullable MimeType mimeType, @Nullable Map<String, Object> hints) { 092 093 throw new UnsupportedOperationException(); 094 } 095 096}