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.json;
018    
019    import org.apache.logging.log4j.core.config.Configuration;
020    import org.apache.logging.log4j.core.config.ConfigurationFactory;
021    import org.apache.logging.log4j.core.config.ConfigurationSource;
022    import org.apache.logging.log4j.core.config.Order;
023    import org.apache.logging.log4j.core.config.plugins.Plugin;
024    import org.apache.logging.log4j.core.util.Loader;
025    
026    /**
027     *
028     */
029    @Plugin(name = "JsonConfigurationFactory", category = ConfigurationFactory.CATEGORY)
030    @Order(6)
031    public class JsonConfigurationFactory extends ConfigurationFactory {
032    
033        /**
034         * The file extensions supported by this factory.
035         */
036        private static final String[] SUFFIXES = new String[] {".json", ".jsn"};
037    
038        private static final String[] dependencies = new String[] {
039                "com.fasterxml.jackson.databind.ObjectMapper",
040                "com.fasterxml.jackson.databind.JsonNode",
041                "com.fasterxml.jackson.core.JsonParser"
042        };
043    
044        private final boolean isActive;
045    
046        public JsonConfigurationFactory() {
047            for (final String dependency : dependencies) {
048                if (!Loader.isClassAvailable(dependency)) {
049                    LOGGER.debug("Missing dependencies for Json support");
050                    isActive = false;
051                    return;
052                }
053            }
054            isActive = true;
055        }
056    
057        @Override
058        protected boolean isActive() {
059            return isActive;
060        }
061    
062        @Override
063        public Configuration getConfiguration(final ConfigurationSource source) {
064            if (!isActive) {
065                return null;
066            }
067            return new JsonConfiguration(source);
068        }
069    
070        @Override
071        public String[] getSupportedTypes() {
072            return SUFFIXES;
073        }
074    }