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package com.izforge.izpack.util;

import java.util.logging.Formatter;
import java.util.logging.Level;
import java.util.logging.LogManager;
import java.util.logging.LogRecord;
import java.util.logging.StreamHandler;

/**
 * A variant of the default Java logging ConsoleHandler, not being so messy
 * @author rkrell
 */
public class LogHandler extends StreamHandler
{
    private void configure()
    {
        LogManager manager = LogManager.getLogManager();
        String cname = getClass().getName();

        // Try loading configured formatter first
        String formatterName = manager.getProperty(cname + ".formatter");
        Formatter formatter = null;
        try {
            if (formatterName != null) {
                Class formatterClass = (Class) ClassLoader.getSystemClassLoader().loadClass(formatterName);
                formatter = (Formatter) formatterClass.newInstance();
            }
        } catch (Exception ex) {
            // We got one of a variety of exceptions in creating the
            // class or creating an instance.
            // Drop through.
        }

        // Load IzPack default formatter, if nothing was configured
        if (formatter == null)
        {
            formatter = new LogFormatter();
        }

        setFormatter(formatter);

        if (Debug.isDEBUG())
        {
            setLevel(Level.FINE);
        }
        else
        {
            setLevel(Level.INFO);
        }
    }

    /**
     * Create a LogHandler for System.err.
     * 
     * The LogHandler is configured based on LogManager properties (or their
     * default values).     *
     */
    public LogHandler()
    {
        configure();
        setOutputStream(System.err);
    }

    /**
     * Publish a LogRecord.
     * 

     * The logging request was made initially to a Logger object, which initialized the
     * LogRecord and forwarded it here.
     * 
     *
     * @param record description of the log event. A null record is silently ignored and is not
     * published
     */
    public void publish(LogRecord record)
    {
        super.publish(record);
        flush();
    }

    /**
     * Override LogHandler.close to do a flush but not to close the output stream. That
     * is, we do not close System.err.
     */
    public void close()
    {
        flush();
    }
}