Example usage for org.apache.commons.net.ftp FTPFileEntryParser readNextEntry

Introduction

In this page you can find the example usage for org.apache.commons.net.ftp FTPFileEntryParser readNextEntry.

Prototype

String readNextEntry(BufferedReader reader) throws IOException;

Source Link

Document

Reads the next entry using the supplied BufferedReader object up to whatever delemits one entry from the next.

Usage

From source file:org.apache.nutch.protocol.ftp.Client.java

/**
 * retrieve list reply for path/*from w  w w.ja v a 2  s  . co m*/
 * 
 * @param path
 * @param entries
 * @param limit
 * @param parser
 * @throws IOException
 * @throws FtpExceptionCanNotHaveDataConnection
 * @throws FtpExceptionUnknownForcedDataClose
 * @throws FtpExceptionControlClosedByForcedDataClose
 */
public void retrieveList(String path, List<FTPFile> entries, int limit, FTPFileEntryParser parser)
        throws IOException, FtpExceptionCanNotHaveDataConnection, FtpExceptionUnknownForcedDataClose,
        FtpExceptionControlClosedByForcedDataClose {
    Socket socket = __openPassiveDataConnection(FTPCommand.LIST, path);

    if (socket == null)
        throw new FtpExceptionCanNotHaveDataConnection("LIST " + ((path == null) ? "" : path));

    BufferedReader reader = new BufferedReader(new InputStreamReader(socket.getInputStream()));

    // force-close data channel socket, when download limit is reached
    // boolean mandatory_close = false;

    // List entries = new LinkedList();
    int count = 0;
    String line = parser.readNextEntry(reader);
    while (line != null) {
        FTPFile ftpFile = parser.parseFTPEntry(line);
        // skip non-formatted lines
        if (ftpFile == null) {
            line = parser.readNextEntry(reader);
            continue;
        }
        entries.add(ftpFile);
        count += line.length();
        // impose download limit if limit >= 0, otherwise no limit
        // here, cut off is up to the line when total bytes is just over limit
        if (limit >= 0 && count > limit) {
            // mandatory_close = true;
            break;
        }
        line = parser.readNextEntry(reader);
    }

    // if (mandatory_close)
    // you always close here, no matter mandatory_close or not.
    // however different ftp servers respond differently, see below.
    socket.close();

    // scenarios:
    // (1) mandatory_close is false, download limit not reached
    // no special care here
    // (2) mandatory_close is true, download limit is reached
    // different servers have different reply codes:

    try {
        int reply = getReply();
        if (!_notBadReply(reply))
            throw new FtpExceptionUnknownForcedDataClose(getReplyString());
    } catch (FTPConnectionClosedException e) {
        // some ftp servers will close control channel if data channel socket
        // is closed by our end before all data has been read out. Check:
        // tux414.q-tam.hp.com FTP server (hp.com version whp02)
        // so must catch FTPConnectionClosedException thrown by getReply() above
        // disconnect();
        throw new FtpExceptionControlClosedByForcedDataClose(e.getMessage());
    }

}

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