001/* 002 * Licensed to the Apache Software Foundation (ASF) under one or more 003 * contributor license agreements. See the NOTICE file distributed with 004 * this work for additional information regarding copyright ownership. 005 * The ASF licenses this file to You under the Apache license, Version 2.0 006 * (the "License"); you may not use this file except in compliance with 007 * the License. You may obtain a copy of the License at 008 * 009 * http://www.apache.org/licenses/LICENSE-2.0 010 * 011 * Unless required by applicable law or agreed to in writing, software 012 * distributed under the License is distributed on an "AS IS" BASIS, 013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 014 * See the license for the specific language governing permissions and 015 * limitations under the license. 016 */ 017package org.apache.logging.log4j.core.appender.db.jpa.converter; 018 019import java.util.Map; 020import javax.persistence.AttributeConverter; 021import javax.persistence.Converter; 022 023/** 024 * A JPA 2.1 attribute converter for {@link Map Map<String, String>}s in 025 * {@link org.apache.logging.log4j.core.LogEvent}s. This converter is only capable of converting to {@link String}s. The 026 * {@link #convertToEntityAttribute(String)} method throws an {@link UnsupportedOperationException}. If you need to 027 * support converting to an entity attribute, you should use the {@link ContextMapJsonAttributeConverter} for conversion 028 * both ways. 029 */ 030@Converter(autoApply = false) 031public class ContextMapAttributeConverter implements AttributeConverter<Map<String, String>, String> { 032 @Override 033 public String convertToDatabaseColumn(final Map<String, String> contextMap) { 034 if (contextMap == null) { 035 return null; 036 } 037 038 return contextMap.toString(); 039 } 040 041 @Override 042 public Map<String, String> convertToEntityAttribute(final String s) { 043 throw new UnsupportedOperationException("Log events can only be persisted, not extracted."); 044 } 045}