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; 020 021import javax.persistence.AttributeConverter; 022import javax.persistence.Converter; 023 024/** 025 * A JPA 2.1 attribute converter for {@link Map Map<String, String>}s in 026 * {@link org.apache.logging.log4j.core.LogEvent}s. This converter is only capable of converting to {@link String}s. The 027 * {@link #convertToEntityAttribute(String)} method throws an {@link UnsupportedOperationException}. If you need to 028 * support converting to an entity attribute, you should use the {@link ContextMapJsonAttributeConverter} for conversion 029 * both ways. 030 */ 031@Converter(autoApply = false) 032public class ContextMapAttributeConverter implements AttributeConverter<Map<String, String>, String> { 033 @Override 034 public String convertToDatabaseColumn(final Map<String, String> contextMap) { 035 if (contextMap == null) { 036 return null; 037 } 038 039 return contextMap.toString(); 040 } 041 042 @Override 043 public Map<String, String> convertToEntityAttribute(final String s) { 044 throw new UnsupportedOperationException("Log events can only be persisted, not extracted."); 045 } 046}