001/* 002 * Licensed to the Apache Software Foundation (ASF) under one or more 003 * contributor license agreements. See the NOTICE file distributed with 004 * this work for additional information regarding copyright ownership. 005 * The ASF licenses this file to You under the Apache License, Version 2.0 006 * (the "License"); you may not use this file except in compliance with 007 * the License. You may obtain a copy of the License at 008 * 009 * http://www.apache.org/licenses/LICENSE-2.0 010 * 011 * Unless required by applicable law or agreed to in writing, software 012 * distributed under the License is distributed on an "AS IS" BASIS, 013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 014 * See the License for the specific language governing permissions and 015 * limitations under the License. 016 */ 017 018package org.apache.commons.net.smtp; 019 020import java.util.Enumeration; 021import java.util.Vector; 022 023/*** 024 * A class used to represent forward and reverse relay paths. The 025 * SMTP MAIL command requires a reverse relay path while the SMTP RCPT 026 * command requires a forward relay path. See RFC 821 for more details. 027 * In general, you will not have to deal with relay paths. 028 * 029 * @see SMTPClient 030 ***/ 031 032public final class RelayPath 033{ 034 Vector<String> _path; 035 String _emailAddress; 036 037 /*** 038 * Create a relay path with the specified email address as the ultimate 039 * destination. 040 * <p> 041 * @param emailAddress The destination email address. 042 ***/ 043 public RelayPath(String emailAddress) 044 { 045 _path = new Vector<String>(); 046 _emailAddress = emailAddress; 047 } 048 049 /*** 050 * Add a mail relay host to the relay path. Hosts are added left to 051 * right. For example, the following will create the path 052 * <code><b> < @bar.com,@foo.com:foobar@foo.com > </b></code> 053 * <pre> 054 * path = new RelayPath("foobar@foo.com"); 055 * path.addRelay("bar.com"); 056 * path.addRelay("foo.com"); 057 * </pre> 058 * <p> 059 * @param hostname The host to add to the relay path. 060 ***/ 061 public void addRelay(String hostname) 062 { 063 _path.addElement(hostname); 064 } 065 066 /*** 067 * Return the properly formatted string representation of the relay path. 068 * <p> 069 * @return The properly formatted string representation of the relay path. 070 ***/ 071 @Override 072 public String toString() 073 { 074 StringBuilder buffer = new StringBuilder(); 075 Enumeration<String> hosts; 076 077 buffer.append('<'); 078 079 hosts = _path.elements(); 080 081 if (hosts.hasMoreElements()) 082 { 083 buffer.append('@'); 084 buffer.append(hosts.nextElement()); 085 086 while (hosts.hasMoreElements()) 087 { 088 buffer.append(",@"); 089 buffer.append(hosts.nextElement()); 090 } 091 buffer.append(':'); 092 } 093 094 buffer.append(_emailAddress); 095 buffer.append('>'); 096 097 return buffer.toString(); 098 } 099 100}