org.fuwjax.oss.util.Log Maven / Gradle / Ivy

Go to download
/*
 * Copyright (C) 2015 fuwjax.org ([email protected])
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *         http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.fuwjax.oss.util;


import java.io.IOException;
import java.io.OutputStream;
import java.io.PrintStream;
import java.io.PrintWriter;
import java.io.StringWriter;
import java.io.UnsupportedEncodingException;
import java.nio.charset.StandardCharsets;
import java.time.LocalDateTime;
import java.util.Arrays;
import java.util.List;
import java.util.function.Supplier;

import org.fuwjax.oss.util.RunWrapException;

public interface Log {
	interface Level{
		String name();
	}
	enum StandardLevel implements Level{
		ERROR,
		WARN,
		INFO
	}

	Log SYSTEM = System.out::println;
	
	class Tee implements Log{
		private List logs;

		public Tee(Log... logs){
			this.logs = Arrays.asList(logs);
		}
		
		@Override
		public void log(String message) {
			logs.forEach(log -> log.log(message));
		}
	}
	
	static String stackTrace(Throwable x){
		StringWriter out = new StringWriter();
		x.printStackTrace(new PrintWriter(out));
		return out.toString();
	}
	
	static Level level(String name){
		return () -> name;
	}

	default void error(Throwable cause, String pattern, Object... args){
		log(StandardLevel.ERROR, cause, pattern, args);
	}
	
	default void error(String pattern, Object... args){
		log(StandardLevel.ERROR, pattern, args);
	}
	
	default void warning(Throwable cause, String pattern, Object... args){
		log(StandardLevel.WARN, cause, pattern, args);
	}
	
	default void warning(String pattern, Object... args){
		log(StandardLevel.WARN, pattern, args);
	}
	
	default void info(String pattern, Object... args){
		log(StandardLevel.INFO, pattern, args);
	}
	
	default void debug(String pattern, Object... args){
		// ignore
	}
	
	default void log(Level level, Throwable cause, String pattern, Object... args){
		log(message(level, cause, pattern, args));
	}

	default void log(Level level, String pattern, Object... args){
		log(message(level, pattern, args));
	}
	
	default void log(String pattern, Object... args){
		log(message(pattern, args));
	}
	
	void log(String message);

	default String message(String pattern, Object...args){
		return String.format(pattern, args);
	}

	default String message(Level level,String pattern,Object... args){
		return String.format("%s: %s: %s", time(LocalDateTime.now()), level.name(), message(pattern, args));
	}
	
	default String message(Level level,Throwable cause,String pattern,Object... args){
		if(cause == null){
			return message(level, pattern, args);
		}
		return String.format("%s: %s: %s:: %s: %s\n%s", time(LocalDateTime.now()), level.name(), message(pattern, args), cause.getClass().getCanonicalName(), cause.getLocalizedMessage(), stackTrace(cause));
	}
	
	default String time(LocalDateTime time){
		return String.format("%tF % toString){
		return new Object(){
			@Override
			public String toString() {
				return String.valueOf(toString.get());
			}
		};
	}
}