SimpleLoggerImpl.java

package org.ow2.choreos.log;

import java.io.BufferedWriter;
import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
import java.util.Calendar;
import java.util.Date;

public class SimpleLoggerImpl implements SimpleLogger {
	
	private static final String DEBUG = "DEBUG";
	private static final String INFO = "INFO";
	private static final String WARN = "WARN";
	private static final String ERROR = "ERROR";

	private File logFile;
	
	public SimpleLoggerImpl(String fileName) {
		
		logFile = new File(fileName);
		try {
			logFile.createNewFile();
		} catch (IOException e) {
			e.printStackTrace();
		}
	}

	@Override
	public void info(String message) {
		this.writeMessage(INFO, message);
	}

	@Override
	public void info(String message, Exception e) {
		this.info(message);
		this.writeMessage(INFO, e.getMessage());
	}

	@Override
	public void debug(String message) {
		this.writeMessage(DEBUG, message);
	}

	@Override
	public void debug(String message, Exception e) {
		this.debug(message);
		this.writeMessage(DEBUG, e.getMessage());
	}

	@Override
	public void error(String message) {
		this.writeMessage(ERROR, message);
	}

	@Override
	public void error(String message, Exception e) {
		this.error(message);
		this.writeMessage(ERROR, e.getMessage());
	}
	
	@Override
	public void warn(String message) {
		this.writeMessage(WARN, message);
	}

	@Override
	public void warn(String message, Exception e) {
		this.warn(message);
		this.writeMessage(WARN, e.getMessage());
	}
	
	private void writeMessage(String level, String message) {
		
		String entry = buildEntry(level, message);
		
		try {
			FileWriter writer = new FileWriter(logFile, true);
			BufferedWriter out = new BufferedWriter(writer);
			out.append(entry);
			out.close();
			writer.close();
		} catch (IOException e) {
			e.printStackTrace();
		}
	}

	private Calendar cal = Calendar.getInstance();
	private String buildEntry(String level, String message) {

		String timestamp = getTimestamp();
		String entry = "[" + level + ": " + timestamp + "] " + message + "\n";
		return entry;
	}

	private String getTimestamp() {
		
		Date now = new Date();
		cal.setTime(now);
		String timestamp = cal.get(Calendar.HOUR_OF_DAY) + ":"
				+ cal.get(Calendar.MINUTE) + ":" + cal.get(Calendar.SECOND);
		return timestamp;
	}

}