Scala example source code file (Example.java)

This example Scala source code file (Example.java) is included in my "Source Code Warehouse" project. The intent of this project is to help you more easily find Scala source code examples by using tags.

All credit for the original source code belongs to scala-lang.org; I'm just trying to make examples easier to find. (For my Scala work, see my Scala examples and tutorials.)

Scala tags/keywords

character, completer, consolereader, example, ioexception, linkedlist, list, printwriter, string, stringscompleter

The Example.java Scala example source code

/*
 * Copyright (c) 2002-2006, Marc Prud'hommeaux. All rights reserved.
 *
 * This software is distributable under the BSD license. See the terms of the
 * BSD license in the documentation provided with this software.
 */
package scala.tools.jline.example;

import scala.tools.jline.console.completer.*;
import scala.tools.jline.console.ConsoleReader;

import java.io.*;
import java.util.*;

public class Example
{
    public static void usage() {
        System.out.println("Usage: java " + Example.class.getName()
            + " [none/simple/files/dictionary [trigger mask]]");
        System.out.println("  none - no completors");
        System.out.println("  simple - a simple completor that comples "
            + "\"foo\", \"bar\", and \"baz\"");
        System.out
            .println("  files - a completor that comples " + "file names");
        System.out.println("  classes - a completor that comples "
            + "java class names");
        System.out
            .println("  trigger - a special word which causes it to assume "
                + "the next line is a password");
        System.out.println("  mask - is the character to print in place of "
            + "the actual password character");
        System.out.println("  color - colored prompt and feedback");
        System.out.println("\n  E.g - java Example simple su '*'\n"
            + "will use the simple compleator with 'su' triggering\n"
            + "the use of '*' as a password mask.");
    }

    public static void main(String[] args) throws IOException {
        Character mask = null;
        String trigger = null;
        boolean color = false;

        ConsoleReader reader = new ConsoleReader();

        reader.setBellEnabled(false);
        reader.setPrompt("prompt> ");

        if ((args == null) || (args.length == 0)) {
            usage();

            return;
        }

        List<Completer> completors = new LinkedList<Completer>();

        if (args.length > 0) {
            if (args[0].equals("none")) {
            }
            else if (args[0].equals("files")) {
                completors.add(new FileNameCompleter());
            }
            else if (args[0].equals("simple")) {
                completors.add(new StringsCompleter("foo", "bar", "baz"));
            }
            else if (args[0].equals("color")) {
                color = true;
                reader.setPrompt("\u001B[1mfoo\u001B[0m@bar\u001B[32m@baz\u001B[0m> ");
            }
            else {
                usage();

                return;
            }
        }

        if (args.length == 3) {
            mask = args[2].charAt(0);
            trigger = args[1];
        }

        for (Completer c : completors) {
            reader.addCompleter(c);
        }

        String line;
        PrintWriter out = new PrintWriter(
                reader.getTerminal().wrapOutIfNeeded(System.out));

        while ((line = reader.readLine()) != null) {
            if (color){
                out.println("\u001B[33m======>\u001B[0m\"" + line + "\"");
            } else {
                out.println("======>\"" + line + "\"");
            }
            out.flush();

            // If we input the special word then we will mask
            // the next line.
            if ((trigger != null) && (line.compareTo(trigger) == 0)) {
                line = reader.readLine("password> ", mask);
            }
            if (line.equalsIgnoreCase("quit") || line.equalsIgnoreCase("exit")) {
                break;
            }
        }
    }
}