Rainbow color, how to do it?

Hey I've made a simple plugin(you can check it out if you want, http://dev.bukkit.org/bukkit-plugins/color-changer/) all the plugin does is whenever you type in /color <color> it runs the command
p.setDisplayName(ChatColor.<COLOR> + p.getName() + ChatColor.RESET);
p.sendMessage(ChatColor.YELLOW + "Your name has changed to " + ChatColor.RESET + ChatColor.<COLOR> + p.getName());. And my question is is there a way to get rainbow as a color, even if it's not possible do you know of any plugins that make it possible?

 

I wrote a color class a while back that you might want to have a look at, I added some comments to help you undestand:

Code:

/**
     * Rainbowizes a given message.
     *
     * @param msg The message you would like to rainbowize
     * @param includeBlack Whether or not the array of colors will include black
     * @return The message in it's rainbow form.
     */
    public String rainbow(String msg, boolean includeBlack) {
        // Converting the message to an array of characters.
        char[] c = msg.toCharArray();
       
        String newMsg = "";
        // Color index
        int color;
        // Setting the color index to an appropriate number.
        if (!(includeBlack))
            color = 1;
        else
            color = 0;
        // Looping through each character in the array.
        for (char ch : c) {
            // Setting the message to a color using a custom translate method (ChatColor.translateAlt..)
            newMsg += trans("&" + color + ch);
            // Adding to the color index
            color++;
           
            // Resetting the color appropriately
            if (color == 9)
                if (!(includeBlack))
                    color = 1;
                else
                    color = 0;
        }
        // Returning the newly crafted message and resetting the colors.
        return newMsg + trans("&r");
    }

(Don't copy it. Look at it, understand it then make your own version )

 

@MrBlackIsBack I'd personally would have done this:
Create a List of ChatColors containing all the possible values:

Code:

List<ChatColor> colors = new ArrayList<ChatColor>(Arrays.asList(ChatColor.values()));
colors.remove(ChatColor.RESET);
if (!includeBlack)
    colors.remove(ChatColor.BLACK);

Remove the unwanted ones (in your example, there is a boolean for black).

In each loop, add the character with the color:

Code:

newMsg += colors.get(color) + "" + ch;

And if the color is out of bound, reset it:

Code:

if (color >= colors.size())
    color = 0;

EDIT: Thanks to @megamichiel's comment, here's a fix for color formats:
Create a new boolean argument called "formats", after the includeBlack one.
Then do (just after the includeBlack code):

Code:

if (!format) {
    colors.remove(ChatColor.BOLD);
    colors.remove(ChatColor.UNDERLINE);
    colors.remove(ChatColor.ITALIC);
    colors.remove(ChatColor.MAGIC);
    colors.remove(ChatColor.STRIKETHROUGH);
}

You could also pass a list of unwanted colors, and use List#removeAll().

 

@au2001
ChatColor also contains all chat formats.

 

@megamichiel Updated, with chat formats and a ChatColor.RESET fix. Thank you for this reminder