content: /*
   * Licensed to the Apache Software Foundation (ASF) under one or more
   * contributor license agreements.  See the NOTICE file distributed with
   * this work for additional information regarding copyright ownership.
   * The ASF licenses this file to You under the Apache License, Version 2.0
   * (the "License"); you may not use this file except in compliance with
   * the License.  You may obtain a copy of the License at
   *
   *      http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  package org.apache.camel.attachment;
  
  import java.util.Collection;
  import java.util.List;
  
  import jakarta.activation.DataHandler;
  
  import org.apache.camel.Message;
  
  /**
   * Represents an attachment as part of a {@link Message}.
   */
  public interface Attachment {
  
      /**
       * Return a DataHandler for the content within this attachment.
       *
       * @return DataHandler for the content
       */
      DataHandler getDataHandler();
  
      /**
       * Get all the headers for this header name. Returns null if no headers for this header name are available.
       *
       * @param  name the name of this header
       * @return      a comma separated list of all header values
       */
      String getHeader(String name);
  
      /**
       * Get all the headers for this header name. Returns null if no headers for this header name are available.
       *
       * @param  name the name of this header
       * @return      a list of all header values
       */
      List<String> getHeaderAsList(String name);
  
      /**
       * Get all header names for this attachment.
       *
       * @return a collection of all header names
       */
      Collection<String> getHeaderNames();
  
      /**
       * Set the value for this header. Replaces any existing header with the same name.
       *
       * @param name  the name of this header
       * @param value the value for this header
       */
      void setHeader(String name, String value);
  
      /**
       * Add this value to the existing values for this header.
       *
       * @param name  the name of this header
       * @param value the value for this header
       */
      void addHeader(String name, String value);
  
      /**
       * Remove all headers with this name.
       *
       * @param name the name of this header
       */
      void removeHeader(String name);
  }
  