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Ajax4jsf is an open source extension to the JavaServer Faces standard that adds AJAX capability to JSF applications without requiring the writing of any JavaScript.

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/**
 * Licensed under the Common Development and Distribution License,
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *   http://www.sun.com/cddl/
 *   
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or 
 * implied. See the License for the specific language governing
 * permissions and limitations under the License.
 */

package org.ajax4jsf.framework.util;

import java.awt.Color;
import java.util.HashMap;
import java.util.Map;

import org.ajax4jsf.framework.util.message.Messages;

/**
 * @author shura (latest modification by $Author: slava_kabanovich $)
 * @version $Revision: 1.2 $ $Date: 2006/07/12 14:59:33 $
 *
 */
public class HtmlColor {
	private static Map colorNames;
	
	static {
		// color names.
		colorNames = new HashMap();
	    colorNames.put("black", new Color(0x000000));
		colorNames.put("green", new Color(0x008000));
		colorNames.put("silver", new Color(0xC0C0C0));
		colorNames.put("lime", new Color(0x00FF00));
		colorNames.put("gray", new Color(0x808080));
		colorNames.put("olive", new Color(0x808000));
		colorNames.put("white", new Color(0xFFFFFF));
		colorNames.put("yellow", new Color(0xFFFF00));
		colorNames.put("maroon", new Color(0x800000));
		colorNames.put("navy", new Color(0x000080));
		colorNames.put("red", new Color(0xFF0000));
		colorNames.put("blue", new Color(0x0000FF));
		colorNames.put("purple", new Color(0x800080));
		colorNames.put("teal", new Color(0x008080));
		colorNames.put("fuchsia", new Color(0xFF00FF));
		colorNames.put("aqua", new Color(0x00FFFF));
	}

	/**
	 * Decode HTML-attribute style of color to {@link Color}
	 * @param color - color name or #RRGGBB string
	 * @return - color for this value.
	 */
	public static Color decode(String color){
		if(null == color) {
			throw new IllegalArgumentException(Messages.getMessage(Messages.NULL_COLOR_PARAMETER_ERROR));
		}
		Color c = (Color) colorNames.get(color.trim().toLowerCase());
		if (null == c) {
			try {
				c = Color.decode(color.trim());
			} catch (NumberFormatException e) {
				throw new IllegalArgumentException(Messages.getMessage(Messages.DECODE_COLOR_PARAMETER_ERROR, color, e.getMessage()));
			}
		}
		return c;
	}
	
	public static Integer integerValue(String color){
		return new Integer(decode(color).getRGB());
	}
	
	public static String encodeRGB(Color color){
		if(null == color) {
			throw new IllegalArgumentException(Messages.getMessage(Messages.NULL_COLOR_PARAMETER_ERROR_2));
		}
		return "#" + Integer.toHexString(color.getRGB()).substring(2).toUpperCase();
	}
	
}