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1   /*
2    * Licensed to the Apache Software Foundation (ASF) under one or more
3    * contributor license agreements. See the NOTICE file distributed with
4    * this work for additional information regarding copyright ownership.
5    * The ASF licenses this file to You under the Apache License, Version 2.0
6    * (the "License"); you may not use this file except in compliance with
7    * the License. You may obtain a copy of the License at
8    *
9    *      http://www.apache.org/licenses/LICENSE-2.0
10   *
11   * Unless required by applicable law or agreed to in writing, software
12   * distributed under the License is distributed on an "AS IS" BASIS,
13   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14   * See the License for the specific language governing permissions and
15   * limitations under the License.
16   */
17  
18  package org.apache.logging.log4j.core.config.plugins.visitors;
19  
20  import java.util.Map;
21  
22  import org.apache.logging.log4j.core.LogEvent;
23  import org.apache.logging.log4j.core.config.Configuration;
24  import org.apache.logging.log4j.core.config.Node;
25  import org.apache.logging.log4j.core.config.plugins.PluginBuilderAttribute;
26  import org.apache.logging.log4j.core.util.NameUtil;
27  
28  /**
29   * PluginVisitor for PluginBuilderAttribute. If {@code null} is returned for the
30   * {@link #visit(org.apache.logging.log4j.core.config.Configuration, org.apache.logging.log4j.core.config.Node, org.apache.logging.log4j.core.LogEvent, StringBuilder)}
31   * method, then the default value of the field should remain untouched.
32   *
33   * @see org.apache.logging.log4j.core.config.plugins.util.PluginBuilder
34   */
35  public class PluginBuilderAttributeVisitor extends AbstractPluginVisitor<PluginBuilderAttribute> {
36  
37      public PluginBuilderAttributeVisitor() {
38          super(PluginBuilderAttribute.class);
39      }
40  
41      @Override
42      public Object visit(final Configuration configuration, final Node node, final LogEvent event,
43                          final StringBuilder log) {
44          final String overridden = this.annotation.value();
45          final String name = overridden.isEmpty() ? this.member.getName() : overridden;
46          final Map<String, String> attributes = node.getAttributes();
47          final String rawValue = removeAttributeValue(attributes, name, this.aliases);
48          final String replacedValue = this.substitutor.replace(event, rawValue);
49          final Object value = convert(replacedValue, null);
50          final Object debugValue = this.annotation.sensitive() ? NameUtil.md5(value + this.getClass().getName()) : value;
51          log.append(name).append("=\"").append(debugValue).append('"');
52          return value;
53      }
54  }