Decode an HTML color string like '#F567BA;' into a Color
/*
* Copyright 2005 Joe Walker
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* 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.
*/
import java.awt.Color;
/**
* Utilities for working with colors.
* @author Joe Walker [joe at getahead dot ltd dot uk]
*/
public class ColorUtil
{
/**
* Decode an HTML color string like '#F567BA;' into a {@link Color}
* @param colorString The string to decode
* @return The decoded color
* @throws IllegalArgumentException if the color sequence is not valid
*/
public static Color decodeHtmlColorString(String colorString)
{
Color color;
if (colorString.startsWith("#"))
{
colorString = colorString.substring(1);
}
if (colorString.endsWith(";"))
{
colorString = colorString.substring(0, colorString.length() - 1);
}
int red, green, blue;
switch (colorString.length())
{
case 6:
red = Integer.parseInt(colorString.substring(0, 2), 16);
green = Integer.parseInt(colorString.substring(2, 4), 16);
blue = Integer.parseInt(colorString.substring(4, 6), 16);
color = new Color(red, green, blue);
break;
case 3:
red = Integer.parseInt(colorString.substring(0, 1), 16);
green = Integer.parseInt(colorString.substring(1, 2), 16);
blue = Integer.parseInt(colorString.substring(2, 3), 16);
color = new Color(red, green, blue);
break;
case 1:
red = green = blue = Integer.parseInt(colorString.substring(0, 1), 16);
color = new Color(red, green, blue);
break;
default:
throw new IllegalArgumentException("Invalid color: " + colorString);
}
return color;
}
}
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