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/*
* Copyright (C) 2012 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.motorola.studio.android.utilities;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.PrintWriter;
import org.apache.commons.net.telnet.TelnetClient;
/**
* DESCRIPTION: This class defines the framework for telnet services to
* comunicate with phoe or emulator devices. <BR>
* RESPONSIBILITY: Provide telnet connection <BR>
* COLABORATORS: none <BR>
* USAGE: This class should be instantiated whenever a telnet connection to a
* phone or emulator device is needed. <BR>
*/
public class TelnetFrameworkAndroid
{
//private InputStreamReader responseReader;
//private PrintWriter commandWriter;
private TelnetClient telnetClient;
private long timeout = 5000L;
/**
* Connect to a device using telnet.
*
* @param telnetHost
* the telnet host IP address
* @param telnetPort
* the telnet port
*
* @throws MotodevException
* when the connection cannot be established
*/
public synchronized void connect(String telnetHost, int telnetPort) throws IOException
{
if ((telnetClient == null) || ((telnetClient != null) && (!telnetClient.isConnected())))
{
telnetClient = new TelnetClient(telnetHost);
telnetClient.connect(telnetHost, telnetPort);
}
}
/**
* Disconnect a telnet connection to a device
*
* @throws MotodevException
* when the disconnection cannot be executed
*/
public synchronized void disconnect() throws IOException
{
if ((telnetClient != null) && (telnetClient.isConnected()))
{
telnetClient.disconnect();
}
}
/**
* @return
*
*/
public synchronized String write(String telnetInputText, String[] waitFor) throws IOException
{
PrintWriter commandWriter = null;
try
{
commandWriter = new PrintWriter(telnetClient.getOutputStream());
commandWriter.println(telnetInputText);
commandWriter.flush();
if (waitFor != null)
{
return waitFor(waitFor);
}
}
finally
{
if (commandWriter != null)
{
commandWriter.close();
}
}
return null;
}
/**
* Tests if the telnet client instance is connected
*
* @return true if it is connected; false otherwise
*/
public boolean isConnected()
{
boolean connected = false;
if (telnetClient != null)
{
connected = telnetClient.isConnected();
}
return connected;
}
/**
*
*/
public String waitFor(String[] waitForArray) throws IOException
{
InputStreamReader responseReader = null;
StringBuffer answerFromRemoteHost = new StringBuffer();
try
{
responseReader = new InputStreamReader(telnetClient.getInputStream());
boolean found = false;
do
{
char readChar = 0;
long currentTime = System.currentTimeMillis();
long timeoutTime = currentTime + timeout;
while (readChar == 0)
{
if (responseReader == null)
{
// responseReader can only be set to null if method
// releaseTelnetInputStreamReader()
// has been called, which should happen if host becomes
// unavailable.
throw new IOException(
"Telnet host is unavailable; stopped waiting for answer.");
}
if (responseReader.ready())
{
readChar = (char) responseReader.read();
}
else
{
try
{
Thread.sleep(50);
}
catch (InterruptedException e)
{
// Do nothing
}
}
currentTime = System.currentTimeMillis();
if ((!responseReader.ready()) && (currentTime > timeoutTime))
{
throw new IOException(
"A timeout has occured when trying to read the telnet stream");
}
}
answerFromRemoteHost.append(readChar);
for (String aWaitFor : waitForArray)
{
found = answerFromRemoteHost.toString().contains(aWaitFor);
}
}
while (!found);
}
finally
{
if (responseReader != null)
{
responseReader.close();
}
}
return answerFromRemoteHost.toString();
}
/**
* Retrieves the input stream associated to this telnet connection
*/
public InputStream getInputStream()
{
InputStream s = null;
if (telnetClient != null)
{
s = telnetClient.getInputStream();
}
return s;
}
/**
* Retrieves the output stream associated to this telnet connection
*/
public OutputStream getOutputStream()
{
OutputStream s = null;
if (telnetClient != null)
{
s = telnetClient.getOutputStream();
}
return s;
}
}
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