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 java.util.Map;
20 import javax.persistence.AttributeConverter;
21 import javax.persistence.Converter;
22
23 /**
24 * A JPA 2.1 attribute converter for {@link Map Map<String, String>}s in
25 * {@link org.apache.logging.log4j.core.LogEvent}s. This converter is only capable of converting to {@link String}s. The
26 * {@link #convertToEntityAttribute(String)} method throws an {@link UnsupportedOperationException}. If you need to
27 * support converting to an entity attribute, you should use the {@link ContextMapJsonAttributeConverter} for conversion
28 * both ways.
29 */
30 @Converter(autoApply = false)
31 public class ContextMapAttributeConverter implements AttributeConverter<Map<String, String>, String> {
32 @Override
33 public String convertToDatabaseColumn(final Map<String, String> contextMap) {
34 if (contextMap == null) {
35 return null;
36 }
37
38 return contextMap.toString();
39 }
40
41 @Override
42 public Map<String, String> convertToEntityAttribute(final String s) {
43 throw new UnsupportedOperationException("Log events can only be persisted, not extracted.");
44 }
45 }