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16 package org.apache.commons.net;
17
18 import java.io.IOException;
19 import java.io.InputStream;
20
21 /***
22 * The WhoisClient class implements the client side of the Internet Whois
23 * Protocol defined in RFC 954. To query a host you create a
24 * WhoisClient instance, connect to the host, query the host, and finally
25 * disconnect from the host. If the whois service you want to query is on
26 * a non-standard port, connect to the host at that port.
27 * Here's a sample use:
28 * <pre>
29 * WhoisClient whois;
30 *
31 * whois = new WhoisClient();
32 *
33 * try {
34 * whois.connect(WhoisClient.DEFAULT_HOST);
35 * System.out.println(whois.query("foobar"));
36 * whois.disconnect();
37 * } catch(IOException e) {
38 * System.err.println("Error I/O exception: " + e.getMessage());
39 * return;
40 * }
41 * </pre>
42 *
43 * <p>
44 * <p>
45 * @author Daniel F. Savarese
46 ***/
47
48 public final class WhoisClient extends FingerClient
49 {
50 /***
51 * The default whois host to query. It is set to whois.internic.net.
52 ***/
53 public static final String DEFAULT_HOST = "whois.internic.net";
54
55 /***
56 * The default whois port. It is set to 43 according to RFC 954.
57 ***/
58 public static final int DEFAULT_PORT = 43;
59
60
61 /***
62 * The default whois constructor. Initializes the
63 * default port to <code> DEFAULT_PORT </code>.
64 ***/
65 public WhoisClient()
66 {
67 setDefaultPort(DEFAULT_PORT);
68 }
69
70 /***
71 * Queries the connected whois server for information regarding
72 * the given handle. It is up to the programmer to be familiar with the
73 * handle syntax of the whois server. You must first connect to a whois
74 * server before calling this method, and you should disconnect afterward.
75 * <p>
76 * @param handle The handle to lookup.
77 * @return The result of the whois query.
78 * @exception IOException If an I/O error occurs during the operation.
79 ***/
80 public String query(String handle) throws IOException
81 {
82 return query(false, handle);
83 }
84
85
86 /***
87 * Queries the connected whois server for information regarding
88 * the given handle and returns the InputStream of the network connection.
89 * It is up to the programmer to be familiar with the handle syntax
90 * of the whois server. You must first connect to a finger server before
91 * calling this method, and you should disconnect after finishing reading
92 * the stream.
93 * <p>
94 * @param handle The handle to lookup.
95 * @return The InputStream of the network connection of the whois query.
96 * Can be read to obtain whois results.
97 * @exception IOException If an I/O error occurs during the operation.
98 ***/
99 public InputStream getInputStream(String handle) throws IOException
100 {
101 return getInputStream(false, handle);
102 }
103
104 }
105