001/**
002 * Logback: the reliable, generic, fast and flexible logging framework.
003 * Copyright (C) 1999-2015, QOS.ch. All rights reserved.
004 *
005 * This program and the accompanying materials are dual-licensed under
006 * either the terms of the Eclipse Public License v1.0 as published by
007 * the Eclipse Foundation
008 *
009 *   or (per the licensee's choosing)
010 *
011 * under the terms of the GNU Lesser General Public License version 2.1
012 * as published by the Free Software Foundation.
013 */
014package ch.qos.logback.classic.pattern;
015
016import java.util.List;
017
018import org.slf4j.Marker;
019
020import ch.qos.logback.classic.spi.ILoggingEvent;
021
022/**
023 * Return the event's marker value(s).
024 * 
025 * @author Sébastien Pennec
026 */
027public class MarkerConverter extends ClassicConverter {
028
029    private static String EMPTY = "";
030
031    public String convert(ILoggingEvent le) {
032        List<Marker> markers = le.getMarkerList();
033        if (markers == null || markers.isEmpty()) {
034            return EMPTY;
035        }
036        int size = markers.size();
037
038        if (size == 1)
039            return markers.get(0).toString();
040
041        StringBuffer buf = new StringBuffer(32);
042        for (int i = 0; i < size; i++) {
043            if (i != 0)
044                buf.append(' ');
045            Marker m = markers.get(i);
046            buf.append(m.toString());
047        }
048        return buf.toString();
049
050    }
051
052}