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; 021 022import org.apache.commons.logging.Log; 023import org.apache.commons.logging.LogFactory; 024 025import org.springframework.core.ResolvableType; 026import org.springframework.lang.Nullable; 027import org.springframework.util.MimeType; 028 029/** 030 * Abstract base class for {@link Decoder} implementations. 031 * 032 * @author Sebastien Deleuze 033 * @author Arjen Poutsma 034 * @since 5.0 035 * @param <T> the element type 036 */ 037public abstract class AbstractEncoder<T> implements Encoder<T> { 038 039 private final List<MimeType> encodableMimeTypes; 040 041 protected Log logger = LogFactory.getLog(getClass()); 042 043 044 protected AbstractEncoder(MimeType... supportedMimeTypes) { 045 this.encodableMimeTypes = Arrays.asList(supportedMimeTypes); 046 } 047 048 049 /** 050 * Set an alternative logger to use than the one based on the class name. 051 * @param logger the logger to use 052 * @since 5.1 053 */ 054 public void setLogger(Log logger) { 055 this.logger = logger; 056 } 057 058 /** 059 * Return the currently configured Logger. 060 * @since 5.1 061 */ 062 public Log getLogger() { 063 return logger; 064 } 065 066 067 @Override 068 public List<MimeType> getEncodableMimeTypes() { 069 return this.encodableMimeTypes; 070 } 071 072 @Override 073 public boolean canEncode(ResolvableType elementType, @Nullable MimeType mimeType) { 074 if (mimeType == null) { 075 return true; 076 } 077 for (MimeType candidate : this.encodableMimeTypes) { 078 if (candidate.isCompatibleWith(mimeType)) { 079 return true; 080 } 081 } 082 return false; 083 } 084 085}