    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
    018    package org.apache.logging.log4j.core.config.plugins.visitors;
    019
    020    import org.apache.logging.log4j.core.LogEvent;
    021    import org.apache.logging.log4j.core.config.Configuration;
    022    import org.apache.logging.log4j.core.config.Node;
    023    import org.apache.logging.log4j.core.config.plugins.PluginConfiguration;
    024
    025    /**
    026     * PluginVisitor implementation for {@link PluginConfiguration}.
    027     */
    028    public class PluginConfigurationVisitor extends AbstractPluginVisitor<PluginConfiguration> {
    029        public PluginConfigurationVisitor() {
    030            super(PluginConfiguration.class);
    031        }
    032
    033        @Override
    034        public Object visit(final Configuration configuration, final Node node, final LogEvent event,
    035                            final StringBuilder log) {
    036            if (this.conversionType.isInstance(configuration)) {
    037                log.append("Configuration");
    038                if (configuration.getName() != null) {
    039                    log.append('(').append(configuration.getName()).append(')');
    040                }
    041                return configuration;
    042            }
    043            LOGGER.warn("Variable annotated with @PluginConfiguration is not compatible with type {}.",
    044                configuration.getClass());
    045            return null;
    046        }
    047    }