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.access.pattern;
015
016import ch.qos.logback.access.spi.IAccessEvent;
017import ch.qos.logback.core.Context;
018import ch.qos.logback.core.pattern.Converter;
019import ch.qos.logback.core.pattern.ConverterUtil;
020import ch.qos.logback.core.pattern.PostCompileProcessor;
021
022public class EnsureLineSeparation implements PostCompileProcessor<IAccessEvent> {
023
024    /**
025     * Add a line separator converter so that access event appears on a separate
026     * line.
027     */
028    @Override
029    public void process(Context context, Converter<IAccessEvent> head) {
030        if (head == null)
031            throw new IllegalArgumentException("Empty converter chain");
032
033        // if head != null, then tail != null as well
034        Converter<IAccessEvent> tail = ConverterUtil.findTail(head);
035        Converter<IAccessEvent> newLineConverter = new LineSeparatorConverter();
036        if (!(tail instanceof LineSeparatorConverter)) {
037            tail.setNext(newLineConverter);
038        }
039    }
040}