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 */ 017 018 package org.apache.commons.net.smtp; 019 020 import java.util.Enumeration; 021 import 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 * <p> 029 * <p> 030 * @author Daniel F. Savarese 031 * @see SMTPClient 032 ***/ 033 034 public final class RelayPath 035 { 036 Vector<String> _path; 037 String _emailAddress; 038 039 /*** 040 * Create a relay path with the specified email address as the ultimate 041 * destination. 042 * <p> 043 * @param emailAddress The destination email address. 044 ***/ 045 public RelayPath(String emailAddress) 046 { 047 _path = new Vector<String>(); 048 _emailAddress = emailAddress; 049 } 050 051 /*** 052 * Add a mail relay host to the relay path. Hosts are added left to 053 * right. For example, the following will create the path 054 * <code><b> < @bar.com,@foo.com:foobar@foo.com > </b></code> 055 * <pre> 056 * path = new RelayPath("foobar@foo.com"); 057 * path.addRelay("bar.com"); 058 * path.addRelay("foo.com"); 059 * </pre> 060 * <p> 061 * @param hostname The host to add to the relay path. 062 ***/ 063 public void addRelay(String hostname) 064 { 065 _path.addElement(hostname); 066 } 067 068 /*** 069 * Return the properly formatted string representation of the relay path. 070 * <p> 071 * @return The properly formatted string representation of the relay path. 072 ***/ 073 @Override 074 public String toString() 075 { 076 StringBuilder buffer = new StringBuilder(); 077 Enumeration<String> hosts; 078 079 buffer.append('<'); 080 081 hosts = _path.elements(); 082 083 if (hosts.hasMoreElements()) 084 { 085 buffer.append('@'); 086 buffer.append(hosts.nextElement()); 087 088 while (hosts.hasMoreElements()) 089 { 090 buffer.append(",@"); 091 buffer.append(hosts.nextElement()); 092 } 093 buffer.append(':'); 094 } 095 096 buffer.append(_emailAddress); 097 buffer.append('>'); 098 099 return buffer.toString(); 100 } 101 102 }