    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    }