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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 java.util.Map;
    20
    21  import javax.persistence.AttributeConverter;
    22  import javax.persistence.Converter;
    23
    24  /**
    25   * A JPA 2.1 attribute converter for {@link Map Map&lt;String, String&gt;}s in
    26   * {@link org.apache.logging.log4j.core.LogEvent}s. This converter is only capable of converting to {@link String}s. The
    27   * {@link #convertToEntityAttribute(String)} method throws an {@link UnsupportedOperationException}. If you need to
    28   * support converting to an entity attribute, you should use the {@link ContextMapJsonAttributeConverter} for conversion
    29   * both ways.
    30   */
    31  @Converter(autoApply = false)
    32  public class ContextMapAttributeConverter implements AttributeConverter<Map<String, String>, String> {
    33      @Override
    34      public String convertToDatabaseColumn(final Map<String, String> contextMap) {
    35          if (contextMap == null) {
    36              return null;
    37          }
    38
    39          return contextMap.toString();
    40      }
    41
    42      @Override
    43      public Map<String, String> convertToEntityAttribute(final String s) {
    44          throw new UnsupportedOperationException("Log events can only be persisted, not extracted.");
    45      }
    46  }