src.main.java.com.eva.log.LogFormatter Maven / Gradle / Ivy

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/*
 * $Id: LogFormatter.java 109 2007-03-24 14:55:03Z max $
 *
 * Copyright (c) 2007 Maximilian Antoni. All rights reserved.
 * 
 * This software is licensed as described in the file LICENSE.txt, which you
 * should have received as part of this distribution. The terms are also
 * available at http://www.maxantoni.de/projects/eva-properties/license.txt.
 */
package com.eva.log;

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

/**
 * default formatter for log messages.
 * 
 * @author Max Antoni
 * @version $Revision: 109 $
 */
public final class LogFormatter extends Formatter {
    private static DateFormat DATE_FORMAT = DateFormat.getDateTimeInstance(
            DateFormat.MEDIUM, DateFormat.MEDIUM);
    private static final String COLON = ": ";
    private static final String NEWLINE = "\n";
    private String prefix;
    
    /**
     * creates a log formatter without a prefix.
     */
    public LogFormatter() {
        super();
    }

    /**
     * creates a log formatter with the given prefix. The prefix will be printed
     * in front of every message, after the log level.
     * 
     * @param inPrefix the prefix.
     */
    public LogFormatter(String inPrefix) {
        super();
        prefix = inPrefix;
    }
    
    /*
     * @see java.util.logging.Formatter#format(java.util.logging.LogRecord)
     */
    public String format(LogRecord inLogRecord) {
        StringBuffer buffer = new StringBuffer();
        buffer.append(DATE_FORMAT.format(new Date(inLogRecord.getMillis())));
        buffer.append(' ');
        buffer.append(inLogRecord.getLevel().getLocalizedName());
        if(inLogRecord.getMessage() == null) {
            buffer.append(COLON);
            buffer.append(inLogRecord.getSourceClassName());
            buffer.append('#');
            buffer.append(inLogRecord.getSourceMethodName());
        }
        else {
            if(prefix != null) {
                buffer.append(' ');
                buffer.append(prefix);
            }
            buffer.append(COLON);
            buffer.append(formatMessage(inLogRecord));
        }
        buffer.append(NEWLINE);
        Throwable throwable = inLogRecord.getThrown();
        if(throwable != null) {
            StringWriter aStringWriter = new StringWriter();
            throwable.printStackTrace(new PrintWriter(aStringWriter));
            buffer.append(aStringWriter.getBuffer());
            buffer.append(NEWLINE);
        }
        return buffer.toString();
    }

}