    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.PluginValue;
    024    import org.apache.logging.log4j.util.StringBuilders;
    025
    026    /**
    027     * PluginVisitor implementation for {@link PluginValue}.
    028     */
    029    public class PluginValueVisitor extends AbstractPluginVisitor<PluginValue> {
    030        public PluginValueVisitor() {
    031            super(PluginValue.class);
    032        }
    033
    034        @Override
    035        public Object visit(final Configuration configuration, final Node node, final LogEvent event,
    036                            final StringBuilder log) {
    037            final String name = this.annotation.value();
    038            final String rawValue = node.getValue() != null ? node.getValue() :
    039                removeAttributeValue(node.getAttributes(), "value");
    040            final String value = this.substitutor.replace(event, rawValue);
    041            StringBuilders.appendKeyDqValue(log, name, value);
    042            return value;
    043        }
    044    }