001/*
002 * Licensed to the Apache Software Foundation (ASF) under one or more
003 * contributor license agreements. See the NOTICE file distributed with
004 * this work for additional information regarding copyright ownership.
005 * The ASF licenses this file to You under the Apache license, Version 2.0
006 * (the "License"); you may not use this file except in compliance with
007 * the License. You may obtain a copy of the License at
008 *
009 *      http://www.apache.org/licenses/LICENSE-2.0
010 *
011 * Unless required by applicable law or agreed to in writing, software
012 * distributed under the License is distributed on an "AS IS" BASIS,
013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014 * See the license for the specific language governing permissions and
015 * limitations under the license.
016 */
017package org.apache.logging.log4j.core.lookup;
018
019import org.apache.logging.log4j.core.LogEvent;
020import org.apache.logging.log4j.core.config.plugins.Plugin;
021
022/**
023 * Looks up values from the log event.
024 */
025@Plugin(name = "event", category = StrLookup.CATEGORY)
026public class EventLookup extends AbstractLookup {
027
028    /**
029     * Looks up the value from the logging event.
030     * @param event The current LogEvent.
031     * @param key  the key to be looked up.
032     * @return The value of the specified log event field.
033     */
034    @Override
035    public String lookup(final LogEvent event, final String key) {
036        if (event == null) {
037            return null;
038        }
039        switch (key) {
040            case "Marker": {
041                return event.getMarker() != null ? event.getMarker().getName() : null;
042            }
043            case "ThreadName": {
044                return event.getThreadName();
045            }
046            case "Level": {
047                return event.getLevel().toString();
048            }
049            case "ThreadId": {
050                return Long.toString(event.getThreadId());
051            }
052            case "Timestamp": {
053                return Long.toString(event.getTimeMillis());
054            }
055            case "Exception": {
056                if (event.getThrown() != null) {
057                    return event.getThrown().getClass().getSimpleName();
058                }
059                if (event.getThrownProxy() != null) {
060                    return event.getThrownProxy().getName();
061                }
062                return null;
063            }
064            case "Logger": {
065                return event.getLoggerName();
066            }
067            case "Message": {
068                return event.getMessage().getFormattedMessage();
069            }
070            default: {
071                return null;
072            }
073        }
074    }
075}