01: /*
02: * Copyright 2001-2005 The Apache Software Foundation
03: *
04: * Licensed under the Apache License, Version 2.0 (the "License");
05: * you may not use this file except in compliance with the License.
06: * You may obtain a copy of the License at
07: *
08: * http://www.apache.org/licenses/LICENSE-2.0
09: *
10: * Unless required by applicable law or agreed to in writing, software
11: * distributed under the License is distributed on an "AS IS" BASIS,
12: * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13: * See the License for the specific language governing permissions and
14: * limitations under the License.
15: */
16: package org.apache.commons.net.smtp;
17:
18: import java.util.Enumeration;
19: import java.util.Vector;
20:
21: /***
22: * A class used to represent forward and reverse relay paths. The
23: * SMTP MAIL command requires a reverse relay path while the SMTP RCPT
24: * command requires a forward relay path. See RFC 821 for more details.
25: * In general, you will not have to deal with relay paths.
26: * <p>
27: * <p>
28: * @author Daniel F. Savarese
29: * @see SMTPClient
30: ***/
31:
32: public final class RelayPath {
33: Vector _path;
34: String _emailAddress;
35:
36: /***
37: * Create a relay path with the specified email address as the ultimate
38: * destination.
39: * <p>
40: * @param emailAddress The destination email address.
41: ***/
42: public RelayPath(String emailAddress) {
43: _path = new Vector();
44: _emailAddress = emailAddress;
45: }
46:
47: /***
48: * Add a mail relay host to the relay path. Hosts are added left to
49: * right. For example, the following will create the path
50: * <code><b> < @bar.com,@foo.com:foobar@foo.com > </b></code>
51: * <pre>
52: * path = new RelayPath("foobar@foo.com");
53: * path.addRelay("bar.com");
54: * path.addRelay("foo.com");
55: * </pre>
56: * <p>
57: * @param hostname The host to add to the relay path.
58: ***/
59: public void addRelay(String hostname) {
60: _path.addElement(hostname);
61: }
62:
63: /***
64: * Return the properly formatted string representation of the relay path.
65: * <p>
66: * @return The properly formatted string representation of the relay path.
67: ***/
68: public String toString() {
69: StringBuffer buffer = new StringBuffer();
70: Enumeration hosts;
71:
72: buffer.append('<');
73:
74: hosts = _path.elements();
75:
76: if (hosts.hasMoreElements()) {
77: buffer.append('@');
78: buffer.append((String) hosts.nextElement());
79:
80: while (hosts.hasMoreElements()) {
81: buffer.append(",@");
82: buffer.append((String) hosts.nextElement());
83: }
84: buffer.append(':');
85: }
86:
87: buffer.append(_emailAddress);
88: buffer.append('>');
89:
90: return buffer.toString();
91: }
92:
93: }
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