001/*
002 * Logback: the reliable, generic, fast and flexible logging framework.
003 * Copyright (C) 1999-2026, 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 v2.0 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.helpers;
015
016import java.util.ArrayList;
017import java.util.List;
018
019import ch.qos.logback.classic.PatternLayout;
020import ch.qos.logback.classic.spi.ILoggingEvent;
021import ch.qos.logback.core.AppenderBase;
022
023/**
024 * An appender used for testing.
025 * 
026 * @author ceki
027 * @since 1.3.0
028 */
029public class WithLayoutListAppender extends AppenderBase<ILoggingEvent> {
030
031    public List<String> list = new ArrayList<>();
032
033    String pattern;
034
035    PatternLayout patternLayout;
036
037    @Override
038    public void start() {
039        if (pattern == null) {
040            addError("null pattern disallowed");
041            return;
042        }
043        patternLayout = new PatternLayout();
044        patternLayout.setContext(context);
045        patternLayout.setPattern(pattern);
046        patternLayout.start();
047        if (patternLayout.isStarted())
048            super.start();
049    }
050
051    protected void append(ILoggingEvent e) {
052        String result = patternLayout.doLayout(e);
053        list.add(result);
054    }
055
056    public String getPattern() {
057        return pattern;
058    }
059
060    public void setPattern(String pattern) {
061        this.pattern = pattern;
062    }
063
064}