LogUtils.java

package com.laytonsmith.PureUtilities.Common;

import java.io.FileWriter;
import java.io.IOException;
import java.io.PrintStream;
import java.util.logging.Level;
import java.util.logging.Logger;

/**
 *
 * 
 */
public final class LogUtils {
    
    private LogUtils(){}
    
    /**
     * Get the system's line endings
     * @return 
     */
    public static String LF() {
        return System.getProperty("line.separator");
    }
    
    /**
     * Logs a message to the given file, appending the current timestamp.
     * @param filename
     * @param message
     * @throws IOException 
     */
    public static void LoggerMessage(String filename, String message) throws IOException{
        String timestamp = DateUtils.ParseCalendarNotation("%Y-%M-%D %h:%m.%s - ");
        QuickAppend(GetLog(filename), timestamp + message + LF());
    }
    
    /**
     * Logs a message to the given file, and prints out to the given logger as well.
     * @param filename
     * @param message
     * @param logger
     * @throws IOException 
     */
    public static synchronized void LoggerMessage(String filename, String message, Logger logger) throws IOException {
        if (logger != null) {
            logger.log(Level.INFO, message);
        }
        LoggerMessage(filename, message);
    }
    
    /**
     * Logs a message to the given file, and prints the message to the given PrintStream, for instance, System.out.
     * @param filename
     * @param message
     * @param out
     * @throws IOException 
     */
    public static synchronized void LoggerMessage(String filename, String message, PrintStream out) throws IOException{
        if(out != null){
            out.println(message);
        }
        LoggerMessage(filename, message);
    }

    public static void QuickAppend(FileWriter f, String message) throws IOException {
        f.append(message);
        f.flush();
    }
    
    private static FileWriter GetLog(String filename) throws IOException{
        return new FileWriter(filename, true);        
    }
    
    public static void Log(String filename, String message) throws IOException {
        QuickAppend(GetLog(filename), message + LF());
    }
}