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.component.mail;
  
  /**
   * Resolver to determine Content-Type for file attachments.
   * <p/>
   * Strategy introduced to work around mail providers having problems with this such as geronimo mail jars.
   * <p/>
   * Note using SUN mail jar have no problem with resolving Content-Type based on file attachments. This resolver is thus
   * only needed to work around mail providers having bugs or when you a new mime type is unknown by the mail provider
   * allowing you to determine it.
   */
  public interface ContentTypeResolver {
  
      /**
       * Resolves the mime content-type based on the attachment file name.
       * <p/>
       * Return <tt>null</tt> if you cannot resolve a content type or want to rely on the mail provider to resolve it for
       * you.
       * <p/>
       * The returned value should only be the mime part of the ContentType header, for example: <tt>image/jpeg</tt>
       * should be returned. Camel will add the remaining <tt>; name=FILENAME</tt>.
       *
       * @param  fileName the attachment file name
       * @return          the Content-Type or <tt>null</tt> to rely on the mail provider
       */
      String resolveContentType(String fileName);
  }
  