/*
* GeoTools - The Open Source Java GIS Toolkit
* http://geotools.org
*
* (C) 2002-2008, Open Source Geospatial Foundation (OSGeo)
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation;
* version 2.1 of the License.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*/
package org.geotools.util;
import java.awt.Color;
import org.geotools.factory.Hints;
/**
* ConverterFactory for handling color conversions.
* <p>
* Supported conversions:
* <ul>
* <li>"#FF0000" (String) -> Color.RED
* <li>"false" -> Boolean.FALSE
* <li>0xFF0000FF (Integer) -> RED with Alpha
* </ul>
* </p>
* <p>
* This code was previously part of the SLD utility class, it is being made
* available as part of the Converters framework to allow for broader use.
* </p>
* @author Jody Garnett (Refractions Research)
* @since 2.5
*
* @source $URL$
*/
public class ColorConverterFactory implements ConverterFactory {
public Converter createConverter(Class source, Class target, Hints hints) {
if ( target.equals( Color.class ) ) {
// string to color
if ( source.equals( String.class ) ) {
return new Converter() {
public Object convert(Object source, Class target) throws Exception {
String rgba = (String) source;
try {
return Color.decode(rgba);
} catch (NumberFormatException badRGB) {
// unavailable
return null;
}
}
};
}
// integer to color
if ( source.equals( Integer.class ) ) {
return new Converter() {
public Object convert(Object source, Class target) throws Exception {
Integer rgba = (Integer) source;
int alpha = 0xff000000 & rgba;
return new Color(rgba, alpha != 0 );
}
};
}
} else if(target.equals(String.class) && source.equals(Color.class)) {
return new Converter() {
public <T> T convert(Object source, Class<T> target) throws Exception {
Color color = (Color) source;
String redCode = Integer.toHexString(color.getRed());
String greenCode = Integer.toHexString(color.getGreen());
String blueCode = Integer.toHexString(color.getBlue());
if (redCode.length() == 1) {
redCode = "0" + redCode;
}
if (greenCode.length() == 1) {
greenCode = "0" + greenCode;
}
if (blueCode.length() == 1) {
blueCode = "0" + blueCode;
}
return (T) ("#" + redCode + greenCode + blueCode).toUpperCase();
}
};
}
return null;
}
}