ColorConverter Class — spring-boot Architecture

Source Code

core/spring-boot/src/main/java/org/springframework/boot/logging/logback/ColorConverter.java lines 42–88

public class ColorConverter extends CompositeConverter<ILoggingEvent> {

	private static final Map<String, AnsiElement> ELEMENTS;

	static {
		Map<String, AnsiElement> ansiElements = new HashMap<>();
		Arrays.stream(AnsiColor.values())
			.filter((color) -> color != AnsiColor.DEFAULT)
			.forEach((color) -> ansiElements.put(color.name().toLowerCase(Locale.ROOT), color));
		ansiElements.put("faint", AnsiStyle.FAINT);
		ELEMENTS = Collections.unmodifiableMap(ansiElements);
	}

	private static final Map<Integer, AnsiElement> LEVELS;

	static {
		Map<Integer, AnsiElement> ansiLevels = new HashMap<>();
		ansiLevels.put(Level.ERROR_INTEGER, AnsiColor.RED);
		ansiLevels.put(Level.WARN_INTEGER, AnsiColor.YELLOW);
		LEVELS = Collections.unmodifiableMap(ansiLevels);
	}

	@Override
	protected String transform(ILoggingEvent event, String in) {
		AnsiElement color = ELEMENTS.get(getFirstOption());
		if (color == null) {
			// Assume highlighting
			color = LEVELS.get(event.getLevel().toInteger());
			color = (color != null) ? color : AnsiColor.GREEN;
		}
		return toAnsiString(in, color);
	}

	protected String toAnsiString(String in, AnsiElement element) {
		return AnsiOutput.toString(element, in);
	}

	static String getName(AnsiElement element) {
		return ELEMENTS.entrySet()
			.stream()
			.filter((entry) -> entry.getValue().equals(element))
			.map(Map.Entry::getKey)
			.findFirst()
			.orElseThrow();
	}

}