/*
 * 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.isEmpty()) {
 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() {}
}