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A library used across several JAdpative applications, it provides some common features based on Install4J Runtime.

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package com.sshtools.jaul;

import java.text.MessageFormat;
import java.util.Optional;

public class Logging {
	
	public interface Logger {
		void info(String msg);

		void debug(String msg);

		void warning(String msg);

		void error(String msg);

		boolean isDebug();
		
	}
	
	private final static class Defaults {
		private final static Logger DEFAULT = new Logger() {
			@Override
			public void info(String msg) {
			}

			@Override
			public void debug(String msg) {
			}

			@Override
			public void warning(String msg) {
				System.err.println("[WARNING] " + msg);
			}

			@Override
			public void error(String msg) {
				System.err.println("[ERROR] " + msg);
			}

			@Override
			public boolean isDebug() {
				return false;
			}
		};
	}

	private static Optional logger = Optional.empty();
	
	public static void setLogger(Logger logger) {
		Logging.logger  = Optional.of(logger);
	}

	private static Logger log() {
		return Logging.logger.orElseGet(() -> Defaults.DEFAULT); 
	}

	public static void info(String pattern, Object... args) {
		log().info(args.length == 0 ? pattern : MessageFormat.format(pattern, args));
	}
	
	public static void debug(String pattern, Object... args) {
		log().debug(args.length == 0 ? pattern : MessageFormat.format(pattern, args));
	}
	
	public static void warn(String pattern, Object... args) {
		log().warning(args.length == 0 ? pattern : MessageFormat.format(pattern, args));
	}
	
	public static void error(String pattern, Object... args) {
		log().error(args.length == 0 ? pattern : MessageFormat.format(pattern, args));
	}

	public static boolean isDebugEnabled() {
		return log().isDebug();
	}
	
	
}