001/* 002 * Copyright 2002-2017 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.messaging.converter; 018 019import org.springframework.lang.Nullable; 020import org.springframework.messaging.MessageHeaders; 021import org.springframework.util.InvalidMimeTypeException; 022import org.springframework.util.MimeType; 023 024/** 025 * Resolve the content type for a message. 026 * 027 * @author Rossen Stoyanchev 028 * @since 4.0 029 */ 030@FunctionalInterface 031public interface ContentTypeResolver { 032 033 /** 034 * Determine the {@link MimeType} of a message from the given MessageHeaders. 035 * @param headers the headers to use for the resolution 036 * @return the resolved {@code MimeType}, or {@code null} if none found 037 * @throws InvalidMimeTypeException if the content type is a String that cannot be parsed 038 * @throws IllegalArgumentException if there is a content type but its type is unknown 039 */ 040 @Nullable 041 MimeType resolve(@Nullable MessageHeaders headers) throws InvalidMimeTypeException; 042 043}