Source for gnu.javax.swing.text.html.css.CSSColor

   1: /* CSSColor.java -- Converts CSS color values
   2:    Copyright (C) 2006 Free Software Foundation, Inc.
   3: 
   4: This file is part of GNU Classpath.
   5: 
   6: GNU Classpath is free software; you can redistribute it and/or modify
   7: it under the terms of the GNU General Public License as published by
   8: the Free Software Foundation; either version 2, or (at your option)
   9: any later version.
  10: 
  11: GNU Classpath is distributed in the hope that it will be useful, but
  12: WITHOUT ANY WARRANTY; without even the implied warranty of
  13: MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14: General Public License for more details.
  15: 
  16: You should have received a copy of the GNU General Public License
  17: along with GNU Classpath; see the file COPYING.  If not, write to the
  18: Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  19: 02110-1301 USA.
  20: 
  21: Linking this library statically or dynamically with other modules is
  22: making a combined work based on this library.  Thus, the terms and
  23: conditions of the GNU General Public License cover the whole
  24: combination.
  25: 
  26: As a special exception, the copyright holders of this library give you
  27: permission to link this library with independent modules to produce an
  28: executable, regardless of the license terms of these independent
  29: modules, and to copy and distribute the resulting executable under
  30: terms of your choice, provided that you also meet, for each linked
  31: independent module, the terms and conditions of the license of that
  32: module.  An independent module is a module which is not derived from
  33: or based on this library.  If you modify this library, you may extend
  34: this exception to your version of the library, but you are not
  35: obligated to do so.  If you do not wish to do so, delete this
  36: exception statement from your version. */
  37: 
  38: 
  39: package gnu.javax.swing.text.html.css;
  40: 
  41: import java.awt.Color;
  42: import java.util.HashMap;
  43: import java.util.Iterator;
  44: import java.util.Set;
  45: 
  46: /**
  47:  * Converts CSS color values into AWT Color values.
  48:  *
  49:  * @author Roman Kennke (kennke@aicas.com)
  50:  */
  51: public class CSSColor
  52: {
  53: 
  54:   private static final HashMap COLOR_MAP;
  55:   static
  56:   {
  57:     COLOR_MAP = new HashMap();
  58:     COLOR_MAP.put("maroon", "#800000");
  59:     COLOR_MAP.put("red", "#ff0000");
  60:     COLOR_MAP.put("orange", "#ffa500");
  61:     COLOR_MAP.put("yellow", "#ffff00");
  62:     COLOR_MAP.put("olive", "#808000");
  63:     COLOR_MAP.put("purple", "#800080");
  64:     COLOR_MAP.put("fuchsia", "#ff00ff");
  65:     COLOR_MAP.put("white", "#ffffff");
  66:     COLOR_MAP.put("lime", "#00ff00");
  67:     COLOR_MAP.put("green", "#008000");
  68:     COLOR_MAP.put("navy", "#000080");
  69:     COLOR_MAP.put("blue", "#0000ff");
  70:     COLOR_MAP.put("aqua", "#00ffff");
  71:     COLOR_MAP.put("teal", "#008080");
  72:     COLOR_MAP.put("black", "#000000");
  73:     COLOR_MAP.put("silver", "#c0c0c0");
  74:     COLOR_MAP.put("gray", "#808080");
  75:   }
  76: 
  77:   /**
  78:    * The CSS value.
  79:    */
  80:   private String value;
  81: 
  82:   /**
  83:    * The converted color.
  84:    */
  85:   private Color color;
  86: 
  87:   /**
  88:    * Creates a new instance.
  89:    *
  90:    * @param val the CSS value
  91:    */
  92:   public CSSColor(String val)
  93:   {
  94:     value = val;
  95:     color = convertValue(value);
  96:   }
  97: 
  98:   /**
  99:    * Converts a CSS color value to an AWT color.
 100:    *
 101:    * @param value the CSS color value
 102:    *
 103:    * @return the converted color value
 104:    */
 105:   public static Color convertValue(String value)
 106:   {
 107:     Color color;
 108:     String val1 = value.toLowerCase();
 109:     if (val1.charAt(0) != '#')
 110:       val1 = (String) COLOR_MAP.get(val1);
 111:     if (val1 != null)
 112:       {
 113:         String hexVal = val1.substring(1).trim();
 114:         try
 115:           {
 116:             int rgb = Integer.parseInt(hexVal, 16);
 117:             color = new Color(rgb);
 118:           }
 119:         catch (NumberFormatException ex)
 120:           {
 121:             color = Color.BLACK;
 122:           }
 123:       }
 124:     else
 125:       color = null;
 126:     return color;
 127:   }
 128: 
 129:   /**
 130:    * Returns the converted color.
 131:    *
 132:    * @return the converted color
 133:    */
 134:   public Color getValue()
 135:   {
 136:     return color;
 137:   }
 138: 
 139:   public String toString()
 140:   {
 141:     return value;
 142:   }
 143: 
 144:   /**
 145:    * Returns <code>true</code> if the specified value is a valid color value,
 146:    * <code>false</code> otherwise.
 147:    *
 148:    * @param val the value to check
 149:    *
 150:    * @return <code>true</code> if the specified value is a valid color value,
 151:    *         <code>false</code> otherwise
 152:    */
 153:   public static boolean isValidColor(String val)
 154:   {
 155:     boolean ret = false;
 156:     if (val.charAt(0) == '#')
 157:       ret = true;
 158:     else
 159:       {
 160:         Set colors = COLOR_MAP.keySet();
 161:         for (Iterator i = colors.iterator(); i.hasNext() && ret == false;)
 162:           {
 163:             String color = (String) i.next();
 164:             if (color.equalsIgnoreCase(val))
 165:               ret = true;
 166:           }
 167:       }
 168:     return ret;
 169:   }
 170: }