Source Code Cross Referenced for ClientFTP.java in  » Web-Crawler » heritrix » org » archive » net » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Web Crawler » heritrix » org.archive.net 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /* ClientFTP.java
002:         *
003:         * $Id: ClientFTP.java 4573 2006-08-31 22:31:23Z paul_jack $
004:         *
005:         * Created on Jun 5, 2003
006:         *
007:         * Copyright (C) 2003 Internet Archive.
008:         *
009:         * This file is part of the Heritrix web crawler (crawler.archive.org).
010:         *
011:         * Heritrix is free software; you can redistribute it and/or modify
012:         * it under the terms of the GNU Lesser Public License as published by
013:         * the Free Software Foundation; either version 2.1 of the License, or
014:         * any later version.
015:         *
016:         * Heritrix is distributed in the hope that it will be useful,
017:         * but WITHOUT ANY WARRANTY; without even the implied warranty of
018:         * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
019:         * GNU Lesser Public License for more details.
020:         *
021:         * You should have received a copy of the GNU Lesser Public License
022:         * along with Heritrix; if not, write to the Free Software
023:         * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
024:         */
025:        package org.archive.net;
026:
027:        import java.io.IOException;
028:        import java.net.Socket;
029:
030:        import org.apache.commons.net.ftp.FTPClient;
031:        import org.apache.commons.net.ftp.FTPReply;
032:
033:        /**
034:         * Client for FTP operations.  This class is necessary only because the
035:         * {@link #_openDataConnection_(int, String)} method is protected in 
036:         * the superclass, and we need to call it directly to handle directory
037:         * listings.  (The code that provides directory listings in the 
038:         * superclass doesn't scale:  It reads the entire directory into
039:         * an in-memory list).
040:         * 
041:         * <p>Additionally, "strict" methods are provided for the other operations
042:         * we use.  Maddeningly, the superclass never raises exceptions.  If an 
043:         * FTP operation fails, then the superclass methods generally return false.
044:         * A developer then needs to check the {@link FTP#getReplyCode()}
045:         * method to see what actually went wrong.  The "strict" methods provided
046:         * by this class invoke the superclass method, check if the success flag
047:         * is false, and then raise an {@link FTPException} with the value of
048:         * {@link FTP#getReplyCode()}.
049:         *
050:         * @author pjack
051:         */
052:        public class ClientFTP extends FTPClient {
053:
054:            /**
055:             * Constructs a new <code>ClientFTP</code>.
056:             */
057:            public ClientFTP() {
058:            }
059:
060:            /**
061:             * Connects to the FTP server at the given host and port.
062:             * 
063:             * @param host    the host of the FTP server to connect to
064:             * @param port    the port the FTP server listens on
065:             * @throws IOException  if the connection cannot be made due to IO error
066:             * @throws FTPException  if the server refuses the connection
067:             */
068:            public void connectStrict(String host, int port) throws IOException {
069:                this .connect(host, port);
070:                int reply = this .getReplyCode();
071:                if (!FTPReply.isPositiveCompletion(reply)) {
072:                    throw new FTPException(reply);
073:                }
074:            }
075:
076:            /**
077:             * Login to the FTP server with the given username and password.
078:             * 
079:             * @param user   the username to login under
080:             * @param pass   the password to use
081:             * @throws IOException   if a network error occurs
082:             * @throws FTPException  if the login is rejected by the server
083:             * @throws org.apache.commons.net.ftp.FTPConnectionClosedException   
084:             *   if the FTP server prematurely closes the connection (for 
085:             *   instance, if the client was idle for too long)
086:             */
087:            public void loginStrict(String user, String pass)
088:                    throws IOException {
089:                boolean r = this .login(user, pass);
090:                if (!r) {
091:                    throw new FTPException(this .getReplyCode());
092:                }
093:            }
094:
095:            /**
096:             * Tells the FTP server to send binary files.
097:             *
098:             * @throws IOException   if a network error occurs
099:             * @throws FTPException  if the server rejects the command
100:             * @throws org.apache.commons.net.ftp.FTPConnectionClosedException   
101:             *   if the FTP server prematurely closes the connection (for 
102:             *   instance, if the client was idle for too long)
103:             */
104:            public void setBinary() throws IOException {
105:                boolean r = super .setFileType(BINARY_FILE_TYPE);
106:                if (!r) {
107:                    throw new FTPException(getReplyCode());
108:                }
109:            }
110:
111:            /**
112:             * Opens a data connection. 
113:             * 
114:             * @param command  the data command (eg, RETR or LIST)
115:             * @param path     the path of the file to retrieve
116:             * @return  the socket to read data from
117:             * @throws  IOException  if a network error occurs
118:             * @throws  FTPException  if a protocol error occurs
119:             */
120:            public Socket openDataConnection(int command, String path)
121:                    throws IOException {
122:                Socket socket = _openDataConnection_(command, path);
123:                if (socket == null) {
124:                    throw new FTPException(this.getReplyCode());
125:                }
126:                return socket;
127:            }
128:
129:        }
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