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 }