RGBColors.java

package src.main.java;

import java.util.Scanner;

/**
 * {@link RGBColors}.
 * @author Samuel Catalano
 */
public class RGBColors{
	
	private static final String EMPTY_SPACE = " ";
	private static final String RGB888 = "RGB888";
	private static final String RGB565 = "RGB565";
	
	/**
	 * Main method.
	 * @param args the arguments.
	 */
	public static void main(String[] args){
		Scanner sc = new Scanner(System.in);
		while(true){
			String rgbFormat = sc.nextLine();
			if(rgbFormat.equals("")){
				break;
			}
			String color = sc.nextLine();
			String result = parseColor(rgbFormat, color);
			System.out.println(result);
		}
	}
	
	/**
	 * Parse color.
	 * @param rgbFormat the RGB format.
	 * @param color the color code.
	 * @return the color parsed.
	 */
	static String parseColor(String rgbFormat, String color){
		String prefix = "0x";
		String suffix = "";
		String result = "";
		
		if(color.startsWith(prefix) && rgbFormat.equalsIgnoreCase(RGB888)){
			Integer r = Integer.valueOf(color.substring(2, 4), 16);
			Integer g = Integer.valueOf(color.substring(4, 6), 16);
			Integer b = Integer.valueOf(color.substring(6, 8), 16);
			
			result = result.concat(r.toString() + " " + g.toString() + " " + b.toString());
		}
		else if(color.startsWith(prefix) && rgbFormat.equalsIgnoreCase(RGB565)){
			Integer r = Integer.valueOf(color.substring(2, 4), 16);
			Integer g = Integer.valueOf(color.substring(4, 6), 16);
			Integer b = Integer.valueOf(color.substring(6, 8), 16);
			
			Integer r5 = ((r * 249) + 1014) >> 11;
			Integer g6 = ((g * 253) + 505) >> 10;
			Integer b5 = ((b * 249) + 1014) >> 11;
			
			result = result.concat(r5.toString() + " " + g6.toString() + " " + b5.toString());
		}
		else if(! color.startsWith(prefix) && rgbFormat.equalsIgnoreCase(RGB888)){
			String[] rgb;
			rgb = color.split(EMPTY_SPACE);
			
			Integer r = Integer.valueOf(rgb[0]);
			Integer g = Integer.valueOf(rgb[1]);
			Integer b = Integer.valueOf(rgb[2]);
			
			suffix = Integer.toHexString(r) + Integer.toHexString(g) + Integer.toHexString(b);
			result = (prefix + suffix.toUpperCase());
		}
		else if(! color.startsWith(prefix) && rgbFormat.equalsIgnoreCase(RGB565)){
			String[] rgb;
			rgb = color.split(EMPTY_SPACE);
			
			Integer r = Integer.valueOf(rgb[0]);
			Integer g = Integer.valueOf(rgb[1]);
			Integer b = Integer.valueOf(rgb[2]);
			
			Integer r5 = ((r * 249) + 1014) >> 11;
			Integer g6 = ((g * 253) + 505) >> 10;
			Integer b5 = ((b * 249) + 1014) >> 11;
			
			suffix = Integer.toHexString(r5) + Integer.toHexString(g6) + Integer.toHexString(b5);
			result = (prefix + suffix.toUpperCase());
		}
		
		return result;
	}
}