ConfigUtil.java

package org.osm2world.core.util;

import java.awt.Color;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

/**
 * utility class for parsing configuration values
 */
final public class ConfigUtil {

	private ConfigUtil() { }
	
	public static final String BG_COLOR_KEY = "backgroundColor";
	public static final String BG_IMAGE_KEY = "backgroundImage";
	public static final String CANVAS_LIMIT_KEY = "canvasLimit";
	
	public static final Color parseColor(String colorString) {
		
		if (colorString == null) {
			return null;
		}
		
		Color color = parseColorTuple(colorString);
		
		if (color != null) {
			return color;
		} else {
		
			try {
				return Color.decode(colorString);
			} catch (NumberFormatException e) {
				return null;
			}
			
		}
		
	}
	
	private static final Pattern hsvTuplePattern = Pattern.compile(
		"^hsv\\s*\\(\\s*(\\d{1,3})\\s*," +
			"\\s*(\\d{1,3})\\s*%\\s*," +
			"\\s*(\\d{1,3})\\s*%\\s*\\)");
		
	/**
	 * parses colors that are given as a color scheme identifier
	 * with a value tuple in brackets.
	 * 
	 * Currently only supports hsv.
	 * 
	 * @return color; null on parsing errors
	 */
	public static final Color parseColorTuple(String colorString) {
		
		Matcher matcher = hsvTuplePattern.matcher(colorString);
		
		if (matcher.matches()) {
			
			try {
				
				int v1 = Integer.parseInt(matcher.group(1));
				int v2 = Integer.parseInt(matcher.group(2));
				int v3 = Integer.parseInt(matcher.group(3));
				
				return Color.getHSBColor(v1 / 360f, v2 / 100f, v3 / 100f);
				
			} catch (NumberFormatException nfe) {
				return null;
			}
			
		}
		
		return null;
		
	}
	
}