Java tutorial
/**************************************************************** * 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.james.transport.util; import javax.mail.MessagingException; import org.apache.james.transport.mailets.redirect.SpecialAddress; import org.apache.mailet.Mail; import org.apache.mailet.MailAddress; import com.google.common.base.Optional; public class ReplyToUtils { public static ReplyToUtils from(Optional<MailAddress> replyTo) { return new ReplyToUtils(replyTo); } public static ReplyToUtils from(MailAddress replyTo) { return new ReplyToUtils(Optional.fromNullable(replyTo)); } private final Optional<MailAddress> replyTo; private ReplyToUtils(Optional<MailAddress> replyTo) { this.replyTo = replyTo; } public Optional<MailAddress> getReplyTo(Mail originalMail) throws MessagingException { if (replyTo.isPresent()) { if (replyTo.get().equals(SpecialAddress.UNALTERED)) { return Optional.absent(); } return Optional.fromNullable(originalMail.getSender()); } return Optional.absent(); } }