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    package org.apache.commons.net.telnet;
018    
019    import java.io.InputStream;
020    import java.io.OutputStream;
021    
022    
023    /***
024     * Simple stream responder.
025     * Waits for strings on an input stream and answers
026     * sending corresponfing strings on an output stream.
027     * The reader runs in a separate thread.
028     * <p>
029     * @author Bruno D'Avanzo
030     ***/
031    public class TelnetTestResponder implements Runnable
032    {
033        InputStream _is;
034        OutputStream _os;
035        String _inputs[], _outputs[];
036        long _timeout;
037    
038        /***
039         * Constructor.
040         * Starts a new thread for the reader.
041         * <p>
042         * @param is - InputStream on which to read.
043         * @param os - OutputStream on which to answer.
044         * @param inputs - Array of waited for Strings.
045         * @param inputs - Array of answers.
046         ***/
047        public TelnetTestResponder(InputStream is, OutputStream os, String inputs[], String outputs[], long timeout)
048        {
049            _is = is;
050            _os = os;
051            _timeout = timeout;
052            _inputs = inputs;
053            _outputs = outputs;
054            Thread reader = new Thread (this);
055    
056            reader.start();
057        }
058    
059        /***
060         * Runs the responder
061         ***/
062        public void run()
063        {
064            boolean result = false;
065            byte buffer[] = new byte[32];
066            long starttime = System.currentTimeMillis();
067    
068            try
069            {
070                String readbytes = "";
071                while(!result &&
072                      ((System.currentTimeMillis() - starttime) < _timeout))
073                {
074                    if(_is.available() > 0)
075                    {
076                        int ret_read = _is.read(buffer);
077                        readbytes = readbytes + new String(buffer, 0, ret_read);
078    
079                        for(int ii=0; ii<_inputs.length; ii++)
080                        {
081                            if(readbytes.indexOf(_inputs[ii]) >= 0)
082                            {
083                                Thread.sleep(1000 * ii);
084                                _os.write(_outputs[ii].getBytes());
085                                result = true;
086                            }
087                        }
088                    }
089                    else
090                    {
091                        Thread.sleep(500);
092                    }
093                }
094    
095            }
096            catch (Exception e)
097            {
098                System.err.println("Error while waiting endstring. " + e.getMessage());
099            }
100        }
101    }