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.config.yaml;
018    
019    import java.io.IOException;
020    
021    import org.apache.logging.log4j.core.config.Configuration;
022    import org.apache.logging.log4j.core.config.ConfigurationSource;
023    import org.apache.logging.log4j.core.config.json.JsonConfiguration;
024    
025    import com.fasterxml.jackson.core.JsonParser;
026    import com.fasterxml.jackson.databind.ObjectMapper;
027    import com.fasterxml.jackson.dataformat.yaml.YAMLFactory;
028    
029    public class YamlConfiguration extends JsonConfiguration {
030    
031        private static final long serialVersionUID = 1L;
032    
033        public YamlConfiguration(final ConfigurationSource configSource) {
034            super(configSource);
035        }
036    
037        @Override
038        protected ObjectMapper getObjectMapper() {
039            return new ObjectMapper(new YAMLFactory()).configure(JsonParser.Feature.ALLOW_COMMENTS, true);
040        }
041    
042        @Override
043        public Configuration reconfigure() {
044            try {
045                final ConfigurationSource source = getConfigurationSource().resetInputStream();
046                if (source == null) {
047                    return null;
048                }
049                return new YamlConfiguration(source);
050            } catch (final IOException ex) {
051                LOGGER.error("Cannot locate file {}", getConfigurationSource(), ex);
052            }
053            return null;
054        }
055    }