org.apache.logging.log4j.core.config.plugins.visitors.PluginValueVisitor Maven / Gradle / Ivy
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to you under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.logging.log4j.core.config.plugins.visitors;
import org.apache.logging.log4j.core.LogEvent;
import org.apache.logging.log4j.core.config.Configuration;
import org.apache.logging.log4j.core.config.Node;
import org.apache.logging.log4j.core.config.plugins.PluginValue;
import org.apache.logging.log4j.util.StringBuilders;
import org.apache.logging.log4j.util.Strings;
/**
* PluginVisitor implementation for {@link PluginValue}.
*/
public class PluginValueVisitor extends AbstractPluginVisitor {
public PluginValueVisitor() {
super(PluginValue.class);
}
@Override
public Object visit(
final Configuration configuration, final Node node, final LogEvent event, final StringBuilder log) {
final String name = this.annotation.value();
final String elementValue = node.getValue();
final String attributeValue = node.getAttributes().get(name);
String rawValue = null; // if neither is specified, return null (LOG4J2-1313)
if (Strings.isNotEmpty(elementValue)) {
if (Strings.isNotEmpty(attributeValue)) {
LOGGER.error(
"Configuration contains {} with both attribute value ({}) AND element"
+ " value ({}). Please specify only one value. Using the element value.",
node.getName(),
attributeValue,
elementValue);
}
rawValue = elementValue;
} else {
rawValue = removeAttributeValue(node.getAttributes(), name);
}
final String value = this.annotation.substitute() ? this.substitutor.replace(event, rawValue) : rawValue;
StringBuilders.appendKeyDqValue(log, name, value);
return value;
}
}