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.jcl;
018    
019    import java.io.IOException;
020    import java.util.concurrent.ConcurrentHashMap;
021    import java.util.concurrent.ConcurrentMap;
022    
023    import org.apache.commons.logging.Log;
024    import org.apache.commons.logging.LogConfigurationException;
025    import org.apache.commons.logging.LogFactory;
026    import org.apache.logging.log4j.spi.LoggerAdapter;
027    
028    /**
029     * Log4j binding for Commons Logging.
030     * {@inheritDoc}
031     */
032    public class LogFactoryImpl extends LogFactory {
033    
034        private final LoggerAdapter<Log> adapter = new LogAdapter();
035    
036        private final ConcurrentMap<String, Object> attributes = new ConcurrentHashMap<String, Object>();
037    
038        @Override
039        public Log getInstance(final String name) throws LogConfigurationException {
040            return adapter.getLogger(name);
041        }
042    
043        @Override
044        public Object getAttribute(final String name) {
045            return attributes.get(name);
046        }
047    
048        @Override
049        public String[] getAttributeNames() {
050            return attributes.keySet().toArray(new String[attributes.size()]);
051        }
052    
053        @Override
054        public Log getInstance(@SuppressWarnings("rawtypes") final Class clazz) throws LogConfigurationException {
055            return getInstance(clazz.getName());
056        }
057    
058        /**
059         * This method is supposed to clear all loggers. In this implementation it will clear all the logger
060         * wrappers but the loggers managed by the underlying logger context will not be.
061         */
062        @Override
063        public void release() {
064            try {
065                adapter.close();
066            } catch (final IOException ignored) {
067            }
068        }
069    
070        @Override
071        public void removeAttribute(final String name) {
072            attributes.remove(name);
073        }
074    
075        @Override
076        public void setAttribute(final String name, final Object value) {
077            if (value != null) {
078                attributes.put(name, value);
079            } else {
080                removeAttribute(name);
081            }
082        }
083    
084    }