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.slf4j;
018
019import java.net.URI;
020
021import org.apache.logging.log4j.spi.LoggerContext;
022import org.apache.logging.log4j.spi.LoggerContextFactory;
023import org.apache.logging.log4j.status.StatusLogger;
024import org.apache.logging.log4j.util.LoaderUtil;
025
026/**
027 *
028 */
029public class SLF4JLoggerContextFactory implements LoggerContextFactory {
030    private static final StatusLogger LOGGER = StatusLogger.getLogger();
031    private static LoggerContext context = new SLF4JLoggerContext();
032
033    public SLF4JLoggerContextFactory() {
034        // LOG4J2-230, LOG4J2-204 (improve error reporting when misconfigured)
035        boolean misconfigured = false;
036        try {
037            LoaderUtil.loadClass("org.slf4j.helpers.Log4jLoggerFactory");
038            misconfigured = true;
039        } catch (final ClassNotFoundException classNotFoundIsGood) {
040            LOGGER.debug("org.slf4j.helpers.Log4jLoggerFactory is not on classpath. Good!");
041        }
042        if (misconfigured) {
043            throw new IllegalStateException("slf4j-impl jar is mutually exclusive with log4j-to-slf4j jar "
044                    + "(the first routes calls from SLF4J to Log4j, the second from Log4j to SLF4J)");
045        }
046    }
047
048    @Override
049    public LoggerContext getContext(final String fqcn, final ClassLoader loader, final Object externalContext,
050                                    final boolean currentContext) {
051        return context;
052    }
053
054    @Override
055    public LoggerContext getContext(final String fqcn, final ClassLoader loader, final Object externalContext,
056                                    final boolean currentContext, final URI configLocation, final String name) {
057        return context;
058    }
059
060    @Override
061    public void removeContext(final LoggerContext ignored) {
062    }
063}