001 /** 002 * 003 * Licensed to the Apache Software Foundation (ASF) under one or more 004 * contributor license agreements. See the NOTICE file distributed with 005 * this work for additional information regarding copyright ownership. 006 * The ASF licenses this file to You under the Apache License, Version 2.0 007 * (the "License"); you may not use this file except in compliance with 008 * the License. You may obtain a copy of the License at 009 * 010 * http://www.apache.org/licenses/LICENSE-2.0 011 * 012 * Unless required by applicable law or agreed to in writing, software 013 * distributed under the License is distributed on an "AS IS" BASIS, 014 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 015 * See the License for the specific language governing permissions and 016 * limitations under the License. 017 */ 018 package org.apache.camel; 019 020 import java.util.Map; 021 022 /** 023 * Represents the available headers on a message or message exchange. 024 * 025 * @version $Revision: 520502 $ 026 */ 027 public interface Headers { 028 029 /** 030 * Accesses a specific header 031 * 032 * @param name 033 * @return object header associated with the name 034 */ 035 Object getHeader(String name); 036 037 /** 038 * Sets a header on the exchange 039 * 040 * @param name of the header 041 * @param value to associate with the name 042 */ 043 void setHeader(String name, Object value); 044 045 /** 046 * Returns all of the headers associated with the request 047 * 048 * @return all the headers in a Map 049 */ 050 Map<String, Object> getHeaders(); 051 052 /** 053 * Creates a copy of the headers so that we can append them to another exchange 054 */ 055 Headers copy(); 056 }