Source Code : HTML color and Java Color

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HTML color and Java Color

 

/**
 * 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.
 */

//Revised from ajax4jsf

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


/**
 * @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("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("DECODE_COLOR_PARAMETER_ERROR");
      }
    }
    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("NULL_COLOR_PARAMETER_ERROR_2");
    }
    return "#" + Integer.toHexString(color.getRGB()).substring(2).toUpperCase();
  }
  
}

   
  

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