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 org.apache.log4j.Appender;
020import org.apache.log4j.Layout;
021import org.apache.log4j.helpers.AppenderAttachableImpl;
022import org.apache.log4j.spi.ErrorHandler;
023import org.apache.log4j.spi.Filter;
024import org.apache.log4j.spi.LoggingEvent;
025import org.apache.logging.log4j.Logger;
026import org.apache.logging.log4j.core.filter.AbstractFilterable;
027import org.apache.logging.log4j.status.StatusLogger;
028
029/**
030 * Holds a Log4j 2 Appender in an empty Log4j 1 Appender so it can be extracted when constructing the configuration.
031 * Allows a Log4j 1 Appender to reference a Log4j 2 Appender.
032 */
033public class AppenderWrapper extends AppenderAttachableImpl implements Appender {
034
035    private static final Logger LOGGER = StatusLogger.getLogger();
036    private final org.apache.logging.log4j.core.Appender appender;
037
038    public AppenderWrapper(org.apache.logging.log4j.core.Appender appender) {
039        this.appender = appender;
040    }
041
042    public org.apache.logging.log4j.core.Appender getAppender() {
043        return appender;
044    }
045
046    @Override
047    public void addFilter(Filter newFilter) {
048        if (appender instanceof AbstractFilterable) {
049            if (newFilter instanceof FilterWrapper) {
050                ((AbstractFilterable) appender).addFilter(((FilterWrapper) newFilter).getFilter());
051            } else {
052                ((AbstractFilterable) appender).addFilter(new FilterAdapter(newFilter));
053            }
054        } else {
055            LOGGER.warn("Unable to add filter to appender {}, it does not support filters", appender.getName());
056        }
057    }
058
059    @Override
060    public Filter getFilter() {
061        return null;
062    }
063
064    @Override
065    public void clearFilters() {
066
067    }
068
069    @Override
070    public void close() {
071        // Not supported with Log4j 2.
072    }
073
074    @Override
075    public void doAppend(LoggingEvent event) {
076        if (event instanceof LogEventAdapter) {
077            appender.append(((LogEventAdapter) event).getEvent());
078        }
079    }
080
081    @Override
082    public String getName() {
083        return appender.getName();
084    }
085
086    @Override
087    public void setErrorHandler(ErrorHandler errorHandler) {
088        appender.setHandler(new ErrorHandlerAdapter(errorHandler));
089    }
090
091    @Override
092    public ErrorHandler getErrorHandler() {
093        return ((ErrorHandlerAdapter)appender.getHandler()).getHandler();
094    }
095
096    @Override
097    public void setLayout(Layout layout) {
098        // Log4j 2 doesn't support this.
099    }
100
101    @Override
102    public Layout getLayout() {
103        return new LayoutWrapper(appender.getLayout());
104    }
105
106    @Override
107    public void setName(String name) {
108        // Log4j 2 doesn't support this.
109    }
110
111    @Override
112    public boolean requiresLayout() {
113        return false;
114    }
115}