001/* 002 * Copyright 2002-2014 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.support; 018 019import org.springframework.messaging.MessageHeaders; 020 021/** 022 * Generic strategy interface for mapping {@link MessageHeaders} to and from other 023 * types of objects. This would typically be used by adapters where the "other type" 024 * has a concept of headers or properties (HTTP, JMS, AMQP, etc). 025 * 026 * @author Mark Fisher 027 * @since 4.1 028 * @param <T> type of the instance to and from which headers will be mapped 029 */ 030public interface HeaderMapper<T> { 031 032 /** 033 * Map from the given {@link MessageHeaders} to the specified target message. 034 * @param headers the abstracted MessageHeaders 035 * @param target the native target message 036 */ 037 void fromHeaders(MessageHeaders headers, T target); 038 039 /** 040 * Map from the given target message to abstracted {@link MessageHeaders}. 041 * @param source the native target message 042 * @return the abstracted MessageHeaders 043 */ 044 MessageHeaders toHeaders(T source); 045 046}