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.whois;
019    
020    import java.io.IOException;
021    import java.io.InputStream;
022    
023    import org.apache.commons.net.finger.FingerClient;
024    
025    /***
026     * The WhoisClient class implements the client side of the Internet Whois
027     * Protocol defined in RFC 954.   To query a host you create a
028     * WhoisClient instance, connect to the host, query the host, and finally
029     * disconnect from the host.  If the whois service you want to query is on
030     * a non-standard port, connect to the host at that port.
031     * Here's a sample use:
032     * <pre>
033     *    WhoisClient whois;
034     *
035     *    whois = new WhoisClient();
036     *
037     *    try {
038     *      whois.connect(WhoisClient.DEFAULT_HOST);
039     *      System.out.println(whois.query("foobar"));
040     *      whois.disconnect();
041     *    } catch(IOException e) {
042     *      System.err.println("Error I/O exception: " + e.getMessage());
043     *      return;
044     *    }
045     * </pre>
046     *
047     * <p>
048     * <p>
049     * @author Daniel F. Savarese
050     ***/
051    
052    public final class WhoisClient extends FingerClient
053    {
054        /***
055         * The default whois host to query.  It is set to whois.internic.net.
056         ***/
057        public static final String DEFAULT_HOST = "whois.internic.net";
058    
059        /***
060         * The default whois port.  It is set to 43 according to RFC 954.
061         ***/
062        public static final int DEFAULT_PORT = 43;
063    
064    
065        /***
066         * The default whois constructor.    Initializes the
067         * default port to <code> DEFAULT_PORT </code>.
068         ***/
069        public WhoisClient()
070        {
071            setDefaultPort(DEFAULT_PORT);
072        }
073    
074        /***
075         * Queries the connected whois server for information regarding
076         * the given handle.  It is up to the programmer to be familiar with the
077         * handle syntax of the whois server.  You must first connect to a whois
078         * server before calling this method, and you should disconnect afterward.
079         * <p>
080         * @param handle  The handle to lookup.
081         * @return The result of the whois query.
082         * @exception IOException  If an I/O error occurs during the operation.
083         ***/
084        public String query(String handle) throws IOException
085        {
086            return query(false, handle);
087        }
088    
089    
090        /***
091         * Queries the connected whois server for information regarding
092         * the given handle and returns the InputStream of the network connection.
093         * It is up to the programmer to be familiar with the handle syntax
094         * of the whois server.  You must first connect to a finger server before
095         * calling this method, and you should disconnect after finishing reading
096         * the stream.
097         * <p>
098         * @param handle  The handle to lookup.
099         * @return The InputStream of the network connection of the whois query.
100         *         Can be read to obtain whois results.
101         * @exception IOException  If an I/O error occurs during the operation.
102         ***/
103        public InputStream getInputStream(String handle) throws IOException
104        {
105            return getInputStream(false, handle);
106        }
107    
108    }
109