EnclosedInSquareBracketsConverter Class — spring-boot Architecture

Source Code

core/spring-boot/src/main/java/org/springframework/boot/logging/log4j2/EnclosedInSquareBracketsConverter.java lines 39–81

@Plugin(name = "enclosedInSquareBrackets", category = PatternConverter.CATEGORY)
@ConverterKeys("esb")
public final class EnclosedInSquareBracketsConverter extends LogEventPatternConverter {

	private final List<PatternFormatter> formatters;

	private EnclosedInSquareBracketsConverter(List<PatternFormatter> formatters) {
		super("enclosedInSquareBrackets", null);
		this.formatters = formatters;
	}

	@Override
	public void format(LogEvent event, StringBuilder toAppendTo) {
		StringBuilder buf = new StringBuilder();
		for (PatternFormatter formatter : this.formatters) {
			formatter.format(event, buf);
		}
		if (buf.isEmpty()) {
			return;
		}
		toAppendTo.append("[");
		toAppendTo.append(buf);
		toAppendTo.append("] ");
	}

	/**
	 * Creates a new instance of the class. Required by Log4J2.
	 * @param config the configuration
	 * @param options the options
	 * @return a new instance, or {@code null} if the options are invalid
	 */
	public static @Nullable EnclosedInSquareBracketsConverter newInstance(@Nullable Configuration config,
			String[] options) {
		if (options.length < 1) {
			LOGGER.error("Incorrect number of options on style. Expected at least 1, received {}", options.length);
			return null;
		}
		PatternParser parser = PatternLayout.createPatternParser(config);
		List<PatternFormatter> formatters = parser.parse(options[0]);
		return new EnclosedInSquareBracketsConverter(formatters);
	}

}