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.util.OptionHelper;
018
019public class RequestHeaderConverter extends AccessConverter {
020
021    String key;
022
023    @Override
024    public void start() {
025        key = getFirstOption();
026        if (OptionHelper.isNullOrEmpty(key)) {
027            addWarn("Missing key for the requested header. Defaulting to all keys.");
028            key = null;
029        }
030        super.start();
031    }
032
033    @Override
034    public String convert(IAccessEvent accessEvent) {
035        if (!isStarted()) {
036            return "INACTIVE_HEADER_CONV";
037        }
038
039        if (key != null) {
040            return accessEvent.getRequestHeader(key);
041        } else {
042            return accessEvent.getRequestHeaderMap().toString();
043        }
044    }
045
046}