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package bjc.utils.cli;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.PrintStream;
import java.util.Arrays;
import java.util.Scanner;
/**
* Runs a CLI interface from the provided set of streams
*
* @author ben
*
*/
public class CLICommander {
private InputStream input;
private OutputStream output;
private OutputStream error;
private ICommandMode initialMode;
/**
* Create a new CLI interface powered by streams
*
* @param input
* The stream to get user input from
* @param output
* The stream to send user output to
* @param error
* The stream to send error messages to
*/
public CLICommander(InputStream input, OutputStream output,
OutputStream error) {
if (input == null) {
throw new NullPointerException(
"Input stream must not be null");
} else if (output == null) {
throw new NullPointerException(
"Output stream must not be null");
} else if (error == null) {
throw new NullPointerException(
"Error stream must not be null");
}
this.input = input;
this.output = output;
this.error = error;
}
/**
* Set the initial command mode to use
*
* @param initialMode
* The initial command mode to use
*/
public void setInitialCommandMode(ICommandMode initialMode) {
if (initialMode == null) {
throw new NullPointerException(
"Initial mode must be non-zero");
}
this.initialMode = initialMode;
}
/**
* Run a set of commands through this commander
*/
public void runCommands() {
PrintStream normalOutput = new PrintStream(output);
PrintStream errorOutput = new PrintStream(error);
@SuppressWarnings("resource")
// We might use this stream multiple times. Don't close it
Scanner inputSource = new Scanner(input);
ICommandMode currentMode = initialMode;
while (currentMode != null) {
if (currentMode.useCustomPrompt()) {
normalOutput.print(currentMode.getCustomPrompt());
} else {
normalOutput.print(currentMode.getName() + ">> ");
}
String ln = inputSource.nextLine();
if (currentMode.canHandleCommand(ln)) {
String[] commandTokens = ln.split(" ");
String[] commandArgs;
if (commandTokens.length > 1) {
commandArgs = Arrays.copyOfRange(commandTokens, 1,
commandTokens.length);
} else {
commandArgs = null;
}
currentMode = currentMode.processCommand(commandTokens[0],
commandArgs);
} else {
errorOutput.print("Error: Unrecognized command " + ln);
}
}
normalOutput.print("Exiting now.");
}
}
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