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.log4j.bridge;
018
019import java.io.Serializable;
020import java.util.ArrayList;
021import java.util.List;
022
023import org.apache.log4j.Appender;
024import org.apache.logging.log4j.core.Filter;
025import org.apache.logging.log4j.core.Layout;
026import org.apache.logging.log4j.core.LogEvent;
027import org.apache.logging.log4j.core.appender.AbstractAppender;
028import org.apache.logging.log4j.core.config.Property;
029import org.apache.logging.log4j.core.filter.CompositeFilter;
030
031/**
032 * Binds a Log4j 1.x Appender to Log4j 2.
033 */
034public class AppenderAdapter {
035
036    private final Appender appender;
037    private final Adapter adapter;
038
039    /**
040     * Constructor.
041     * @param appender The Appender to wrap.
042     */
043    public AppenderAdapter(Appender appender) {
044        this.appender = appender;
045        org.apache.logging.log4j.core.Filter appenderFilter = null;
046        if (appender.getFilter() != null) {
047            if (appender.getFilter().getNext() != null) {
048                org.apache.log4j.spi.Filter filter = appender.getFilter();
049                List<org.apache.logging.log4j.core.Filter> filters = new ArrayList<>();
050                while (filter != null) {
051                    filters.add(new FilterAdapter(filter));
052                    filter = filter.getNext();
053                }
054                appenderFilter = CompositeFilter.createFilters(filters.toArray(Filter.EMPTY_ARRAY));
055            } else {
056                appenderFilter = new FilterAdapter(appender.getFilter());
057            }
058        }
059        this.adapter = new Adapter(appender.getName(), appenderFilter, null, true, null);
060    }
061
062    public Adapter getAdapter() {
063        return adapter;
064    }
065
066    public class Adapter extends AbstractAppender {
067
068        protected Adapter(final String name, final Filter filter, final Layout<? extends Serializable> layout,
069            final boolean ignoreExceptions, final Property[] properties) {
070            super(name, filter, layout, ignoreExceptions, properties);
071        }
072
073        @Override
074        public void append(LogEvent event) {
075            appender.doAppend(new LogEventAdapter(event));
076        }
077
078        @Override
079        public void stop() {
080            appender.close();
081        }
082
083        public Appender getAppender() {
084            return appender;
085        }
086    }
087}