A traditional way to debug programs is to carefully place print-statements here and there. However, as the amount of printed text increases the ability to filter out and understand the important information decreases. For this reasons, I have searched on how to use ANSI color codes in Java and found a nice implementation in Jlibs. Unfortunately this library did way more than what I needed, and therefore I have stripped it down into a small class that wraps a text string to add color codes and attributes. Feel free to use it and thanks a lot to the original author :-)
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| /** | |
| * Based on Santhosh Kumar T ANSI library distributed under GPL | |
| * | |
| * Original copyright (C) 2009 Santhosh Kumar T | |
| * | |
| * This library is free software; you can redistribute it and/or | |
| * modify it under the terms of the GNU Lesser General Public | |
| * License as published by the Free Software Foundation; either | |
| * version 2.1 of the License, or (at your option) any later version. | |
| * | |
| * This library is distributed in the hope that it will be useful, | |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| * Lesser General Public License for more details. | |
| */ | |
| public class Ansi { | |
| public enum Attribute { | |
| NORMAL(0), | |
| BRIGHT(1), | |
| DIM(2), | |
| UNDERLINE(4), | |
| BLINK(5), | |
| REVERSE(7), | |
| HIDDEN(8); | |
| private String value; | |
| private Attribute(int value) { | |
| this.value = String.valueOf(value); | |
| } | |
| public String toString() { | |
| return "" + value; | |
| } | |
| } | |
| public enum Color {BLACK, RED, GREEN, YELLOW, BLUE, MAGENTA, CYAN, WHITE} | |
| private static final String PREFIX = "\u001b["; //NOI18N | |
| private static final String SUFFIX = "m"; | |
| private static final String SEPARATOR = ";"; | |
| private static final String END = PREFIX + SUFFIX; | |
| public static String format(String text, Color foreground) { | |
| return format(text, null, foreground, null); | |
| } | |
| public static String format(String text, Color foreground, Color background) { | |
| return format(text, null, foreground, background); | |
| } | |
| public static String format(String text, Attribute attr, Color foreground, Color background) { | |
| StringBuilder buff = new StringBuilder(); | |
| if (attr != null) { | |
| buff.append(attr); | |
| } | |
| if (foreground != null) { | |
| if (buff.length() > 0) { | |
| buff.append(SEPARATOR); | |
| } | |
| buff.append(30 + foreground.ordinal()); | |
| } | |
| if (background != null) { | |
| if (buff.length() > 0) { | |
| buff.append(SEPARATOR); | |
| } | |
| buff.append(40 + background.ordinal()); | |
| } | |
| buff.insert(0, PREFIX); | |
| buff.append(SUFFIX); | |
| buff.append(text); | |
| buff.append(END); | |
| return buff.toString(); | |
| } | |
| } |