/*

 * Copyright (c) 1994, 2011, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.  Oracle designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Oracle in the LICENSE file that accompanied this code.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 */

package sun.net;

import java.io.*;

import java.util.Vector;

/**

 * This class implements that basic intefaces of transfer protocols.

 * It is used by subclasses implementing specific protocols.

 *

 * @author      Jonathan Payne

 * @see         sun.net.ftp.FtpClient

 * @see         sun.net.nntp.NntpClient

 */

public class TransferProtocolClient extends NetworkClient {

    static final boolean debug = false;

    /** Array of strings (usually 1 entry) for the last reply

        from the server. */

    protected Vector<String> serverResponse = new Vector<>(1);

    /** code for last reply */

    protected int       lastReplyCode;

    /**

     * Pulls the response from the server and returns the code as a

     * number. Returns -1 on failure.

     */

    public int readServerResponse() throws IOException {

        StringBuilder   replyBuf = new StringBuilder(32);

        int             c;

        int             continuingCode = -1;

        int             code;

        String          response;

        serverResponse.setSize(0);

        while (true) {

            while ((c = serverInput.read()) != -1) {

                if (c == '\r') {

                    if ((c = serverInput.read()) != '\n')

                        replyBuf.append('\r');

                }

                replyBuf.append((char)c);

                if (c == '\n')

                    break;

            }

            response = replyBuf.toString();

            replyBuf.setLength(0);

            if (debug) {

                System.out.print(response);

            }

            if (response.length() == 0) {

                code = -1;

            } else {

                try {

                    code = Integer.parseInt(response, 0, 3, 10);

                } catch (NumberFormatException e) {

                    code = -1;

                } catch (IndexOutOfBoundsException e) {

                    /* this line doesn't contain a response code, so

                       we just completely ignore it */

                    continue;

                }

            }

            serverResponse.addElement(response);

            if (continuingCode != -1) {

                /* we've seen a XXX- sequence */

                if (code != continuingCode ||

                    (response.length() >= 4 && response.charAt(3) == '-')) {

                    continue;

                } else {

                    /* seen the end of code sequence */

                    continuingCode = -1;

                    break;

                }

            } else if (response.length() >= 4 && response.charAt(3) == '-') {

                continuingCode = code;

                continue;

            } else {

                break;

            }

        }

        return lastReplyCode = code;

    }

    /** Sends command <i>cmd</i> to the server. */

    public void sendServer(String cmd) {

        serverOutput.print(cmd);

        if (debug) {

            System.out.print("Sending: " + cmd);

        }

    }

    /** converts the server response into a string. */

    public String getResponseString() {

        return serverResponse.elementAt(0);

    }

    /** Returns all server response strings. */

    public Vector<String> getResponseStrings() {

        return serverResponse;

    }

    /** standard constructor to host <i>host</i>, port <i>port</i>. */

    public TransferProtocolClient(String host, int port) throws IOException {

        super(host, port);

    }

    /** creates an uninitialized instance of this class. */

    public TransferProtocolClient() {}

}