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 018package org.apache.logging.log4j.core.config.plugins.visitors; 019 020import org.apache.logging.log4j.core.LogEvent; 021import org.apache.logging.log4j.core.config.Configuration; 022import org.apache.logging.log4j.core.config.Node; 023import org.apache.logging.log4j.core.config.plugins.PluginValue; 024import org.apache.logging.log4j.util.StringBuilders; 025import org.apache.logging.log4j.util.Strings; 026 027/** 028 * PluginVisitor implementation for {@link PluginValue}. 029 */ 030public class PluginValueVisitor extends AbstractPluginVisitor<PluginValue> { 031 public PluginValueVisitor() { 032 super(PluginValue.class); 033 } 034 035 @Override 036 public Object visit(final Configuration configuration, final Node node, final LogEvent event, 037 final StringBuilder log) { 038 final String name = this.annotation.value(); 039 final String elementValue = node.getValue(); 040 final String attributeValue = node.getAttributes().get("value"); 041 String rawValue = null; // if neither is specified, return null (LOG4J2-1313) 042 if (Strings.isNotEmpty(elementValue)) { 043 if (Strings.isNotEmpty(attributeValue)) { 044 LOGGER.error("Configuration contains {} with both attribute value ({}) AND element" + 045 " value ({}). Please specify only one value. Using the element value.", 046 node.getName(), attributeValue, elementValue); 047 } 048 rawValue = elementValue; 049 } else { 050 rawValue = removeAttributeValue(node.getAttributes(), "value"); 051 } 052 final String value = this.substitutor.replace(event, rawValue); 053 StringBuilders.appendKeyDqValue(log, name, value); 054 return value; 055 } 056}