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package org.python.util.install.driver;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import org.python.util.install.driver.Tunnel;
/**
* A simple class performing console I/O, easy to test.
*/
public class DrivableConsole {
private static final String _PROMPT = ">>>";
private Tunnel _tunnel;
public DrivableConsole(Tunnel tunnel) {
_tunnel = tunnel;
}
/**
* The console logic.
*/
public void handleConsoleIO() throws Exception {
String answer;
answer = question("first question");
if ("1".equals(answer)) {
System.out.println("answer1 is " + answer);
answer = question("second question");
if ("2".equals(answer)) {
System.out.println("answer2 is " + answer);
answer = question("third question");
if ("3".equals(answer)) {
System.out.println("answer3 is " + answer);
} else {
throw new Exception("wrong answer3: " + answer);
}
} else {
throw new Exception("wrong answer2: " + answer);
}
} else {
throw new Exception("wrong answer1: " + answer);
}
}
/**
* Write a question (to normal <code>System.out</code>)
*/
private String question(String question) throws IOException {
question = question + " " + _PROMPT + " ";
String answer = "";
// output to normal System.out
System.out.print(question); // intended print, not println (!)
answer = readLine();
return answer;
}
/**
* Send a signal through the tunnel, and then wait for the answer from the other side.
*
* <pre>
* (2) [Driver] receives question [Tunnel] sends question [Console] (1)
* (3) [Driver] sends answer [Tunnel] receives answer [Console] (4)
* </pre>
*/
private String readLine() throws IOException {
InputStream inputStream;
String line = "";
if (_tunnel == null) {
inputStream = System.in;
} else {
inputStream = _tunnel.getAnswerReceiverStream();
_tunnel.getQuestionSenderStream().write(Tunnel.NEW_LINE.getBytes());
_tunnel.getQuestionSenderStream().flush();
}
BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream));
line = reader.readLine();
return line;
}
}
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