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Logger that provides i18n and varargs
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/**
 * EasyBeans
 * Copyright (C) 2006 Bull S.A.S.
 * Contact: [email protected]
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307
 * USA
 *
 * --------------------------------------------------------------------------
 * $Id: JDKFormatter.java 4389 2008-12-15 13:48:57Z alitokmen $
 * --------------------------------------------------------------------------
 */

package org.ow2.util.log;

import java.io.PrintWriter;
import java.io.StringWriter;
import java.text.MessageFormat;
import java.util.Date;
import java.util.logging.Formatter;
import java.util.logging.LogRecord;

/**
 * Format a record into a readable message ! not too long.
 * @author Florent Benoit
 */
public class JDKFormatter extends Formatter {

    /**
     * Date formatter, use the short for date, medium for the time.
     */
    private static final  String PATTERN_DATE_TIME = "{0,date,short} {0,time,medium}";

    /**
     * Line separator.
     */
    private static final String LINE_SEPARATOR = System.getProperty("line.separator");

    /**
     * Date object used to convert the data into printable message.
     */
    private Date date = new Date();

    /**
     * Format the given LogRecord.
     * @param logRecord the log record to be formatted.
     * @return a formatted log record
     */
    @Override
    public synchronized String format(final LogRecord logRecord) {

        StringBuilder fullMessage = new StringBuilder();
        // Append date/time
        date.setTime(logRecord.getMillis());
        fullMessage.append(MessageFormat.format(PATTERN_DATE_TIME, date));

        // Level
        fullMessage.append(" (");
        fullMessage.append(logRecord.getLevel().getLocalizedName().substring(0, 1));
        fullMessage.append(") ");

        if (logRecord.getSourceClassName() != null) {
            // Only Class name
            String[] splitNames = logRecord.getSourceClassName().split("\\.");
            fullMessage.append(splitNames[splitNames.length - 1]);
        } else {
            fullMessage.append(logRecord.getLoggerName());
        }
        if (logRecord.getSourceMethodName() != null) {
            fullMessage.append(".");
            fullMessage.append(logRecord.getSourceMethodName());
        }
        fullMessage.append(" : ");

        // Append message stored in the log record
        String userMessage = formatMessage(logRecord);
        fullMessage.append(userMessage);

        // Line separator
        fullMessage.append(LINE_SEPARATOR);

        // Exception ?
        if (logRecord.getThrown() != null) {
            try {
                StringWriter stringWriter = new StringWriter();
                PrintWriter printWriter = new PrintWriter(stringWriter);
                logRecord.getThrown().printStackTrace(printWriter);
                printWriter.close();
                fullMessage.append(stringWriter.toString());
            } catch (Exception ex) {
                System.err.println("Formatter error" + ex.getMessage());
            }
        }
        return fullMessage.toString();
    }
}