ColorHelper.java

// License: GPL. Copyright 2007 by Immanuel Scholz and others
package org.openstreetmap.josm.tools;

import java.awt.Color;

/**
 * Helper to convert from color to html string and back
 */
public class ColorHelper {

    public static Color html2color(String html) {
        if (html.length() > 0 && html.charAt(0) == '#')
            html = html.substring(1);
        if (html.length() != 6 && html.length() != 8)
            return null;
        try {
            return new Color(
                    Integer.parseInt(html.substring(0,2),16),
                    Integer.parseInt(html.substring(2,4),16),
                    Integer.parseInt(html.substring(4,6),16),
                    (html.length() == 8 ? Integer.parseInt(html.substring(6,8),16) : 255));
        } catch (NumberFormatException e) {
            return null;
        }
    }

    private static String int2hex(int i) {
        String s = Integer.toHexString(i / 16) + Integer.toHexString(i % 16);
        return s.toUpperCase();
    }

    public static String color2html(Color col) {
        return "#"+int2hex(col.getRed())+int2hex(col.getGreen())+int2hex(col.getBlue());
    }
}