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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  package org.apache.logging.log4j.core.appender.db.jpa.converter;
18  
19  import javax.persistence.AttributeConverter;
20  import javax.persistence.Converter;
21  
22  import org.apache.logging.log4j.Marker;
23  import org.apache.logging.log4j.MarkerManager;
24  import org.apache.logging.log4j.core.helpers.Strings;
25  
26  /**
27   * A JPA 2.1 attribute converter for {@link Marker}s in {@link org.apache.logging.log4j.core.LogEvent}s. This
28   * converter is capable of converting both to and from {@link String}s.
29   */
30  @Converter(autoApply = false)
31  public class MarkerAttributeConverter implements AttributeConverter<Marker, String> {
32      @Override
33      public String convertToDatabaseColumn(final Marker marker) {
34          if (marker == null) {
35              return null;
36          }
37  
38          final StringBuilder builder = new StringBuilder(marker.getName());
39          Marker parent = marker.getParent();
40          int levels = 0;
41          boolean hasParent = false;
42          while (parent != null) {
43              levels++;
44              hasParent = true;
45              builder.append("[ ").append(parent.getName());
46              parent = parent.getParent();
47          }
48          for (int i = 0; i < levels; i++) {
49              builder.append(" ]");
50          }
51          if (hasParent) {
52              builder.append(" ]");
53          }
54          return builder.toString();
55      }
56  
57      @Override
58      public Marker convertToEntityAttribute(final String s) {
59          if (Strings.isEmpty(s)) {
60              return null;
61          }
62  
63          final int bracket = s.indexOf("[");
64  
65          return bracket < 1 ? MarkerManager.getMarker(s) : MarkerManager.getMarker(s.substring(0, bracket));
66      }
67  }