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     */
017    package org.apache.logging.log4j.core.filter;
018    
019    import org.apache.logging.log4j.Level;
020    import org.apache.logging.log4j.Marker;
021    import org.apache.logging.log4j.core.LogEvent;
022    import org.apache.logging.log4j.core.Logger;
023    import org.apache.logging.log4j.core.config.plugins.Plugin;
024    import org.apache.logging.log4j.core.config.plugins.PluginAttribute;
025    import org.apache.logging.log4j.core.config.plugins.PluginFactory;
026    import org.apache.logging.log4j.message.Message;
027    
028    /**
029     * This filter returns the onMatch result if the marker in the LogEvent is the same as or has the
030     * configured marker as a parent.
031     *
032     */
033    @Plugin(name = "MarkerFilter", category = "Core", elementType = "filter", printObject = true)
034    public final class MarkerFilter extends AbstractFilter {
035    
036        private final String name;
037    
038        private MarkerFilter(final String name, final Result onMatch, final Result onMismatch) {
039            super(onMatch, onMismatch);
040            this.name = name;
041        }
042    
043        @Override
044        public Result filter(final Logger logger, final Level level, final Marker marker, final String msg,
045                             final Object... params) {
046            return filter(marker);
047        }
048    
049        @Override
050        public Result filter(final Logger logger, final Level level, final Marker marker, final Object msg,
051                             final Throwable t) {
052            return filter(marker);
053        }
054    
055        @Override
056        public Result filter(final Logger logger, final Level level, final Marker marker, final Message msg,
057                             final Throwable t) {
058            return filter(marker);
059        }
060    
061        @Override
062        public Result filter(final LogEvent event) {
063            return filter(event.getMarker());
064        }
065    
066        private Result filter(final Marker marker) {
067            return marker != null && marker.isInstanceOf(name) ? onMatch : onMismatch;
068        }
069    
070        @Override
071        public String toString() {
072            return name;
073        }
074    
075        /**
076         * Create the MarkerFilter.
077         * @param marker The Marker name to match.
078         * @param match The action to take if a match occurs.
079         * @param mismatch The action to take if no match occurs.
080         * @return A MarkerFilter.
081         */
082        @PluginFactory
083        public static MarkerFilter createFilter(
084                @PluginAttribute("marker") final String marker,
085                @PluginAttribute("onMatch") final Result match,
086                @PluginAttribute("onMismatch") final Result mismatch) {
087    
088            if (marker == null) {
089                LOGGER.error("A marker must be provided for MarkerFilter");
090                return null;
091            }
092            return new MarkerFilter(marker, match, mismatch);
093        }
094    
095    }